CN109301406B - Bandwidth-adjustable miniaturized filtering integrated three-dimensional balun - Google Patents
Bandwidth-adjustable miniaturized filtering integrated three-dimensional balun Download PDFInfo
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Abstract
A miniaturized filtering integrated stereo balun with adjustable bandwidth comprises: the feed panel of level setting and perpendicular installation mounting panel on the feed panel, the feed panel includes: input port, first output port and second output port, the mounting panel includes: the device comprises a gradient structure strip line, a resonator, a quarter-wavelength impedance converter and a bandwidth adjusting module. On one hand, the capacitance value of a variable capacitance diode in a resonator is adjusted by changing the preset voltage value of an external power supply, so that the three-dimensional balun not only integrates broadband filtering, but also has adjustable working frequency band, and meets the requirement of radio system performance follow-up; on the other hand, by adopting the three-dimensional structure, the horizontal ground of the balun is complete, the later installation operation of the metal shielding box is simplified, the installation difficulty is reduced, and the parasitic resonance caused between the traditional double-sided parallel strip line and the shielding box is effectively avoided.
Description
Technical Field
The invention relates to the technical field of microwave radio frequency, in particular to a miniaturized filtering integrated three-dimensional balun with adjustable bandwidth.
Background
The primary role of a balun is to change a single-ended unbalanced input to a double-ended balanced output and vice versa. The balun is widely applied to frequency multipliers, push-pull amplifiers and antenna feed networks to reduce noise and higher harmonics of circuits, improve the dynamic range of the circuits, and become a key component of balanced layout of microwave circuits.
In the background of expanding communication demand, the contradiction between the shortage of spectrum resources and the urgency of data transmission is increasingly worsened, and the operating frequency band of the wireless mobile communication system shows a development trend of large range, large interval and sparseness. In addition, in modern applications such as electronic interference and electronic reconnaissance, the anti-interference means of the communication system must be flexible. However, once the conventional microwave device is produced, the performance parameters are fixed, and the requirements of the radio on the spectrum dynamics and the performance follow-up are difficult to meet.
The tunable resonator in the reference document [2013, a tune-all wideband filter based on tuned ring-resonators, IEEE microw.wire.compound.lett ], combines the structure with a single stereo balun, and adds a matching unit, so that the ground integrity of the bottom layer of the horizontal feed board is ensured, the horizontal feed board has a filtering function, and the bandwidth is adjustable.
Disclosure of Invention
The embodiment of the invention aims to provide a miniaturized filtering integrated three-dimensional balun with adjustable bandwidth, which changes the capacitance value of a variable capacitance diode in a resonator by changing the preset voltage value of an external power supply, so that the three-dimensional balun not only integrates broadband filtering, but also has adjustable working frequency band, and meets the requirement of radio system performance follow-up; through adopting spatial structure's balun, make the level ground of balun complete, simplified the metal shielding box later stage installation operation, reduced the installation degree of difficulty, and effectively avoided the parasitic resonance that causes between traditional double-sided parallel strip line and shielding box.
In order to solve the above technical problem, an embodiment of the present invention provides a miniaturized filtering integrated stereo balun with adjustable bandwidth, including: the feed board is horizontally arranged and the mounting board is vertically mounted on the feed board; the feed board includes: the input port, the first output port and the second output port are electrically connected with the mounting plate through microstrip lines respectively; the mounting plate includes: gradual change structure band wire, resonator and the quarter wavelength impedance transformer that connects gradually still include: a bandwidth adjustment module; the resonator is a resonant network comprising vertical double-sided parallel strip lines and a plurality of variable capacitance diodes; the quarter-wavelength impedance converter is of a vertical double-sided parallel strip line structure; the bandwidth adjusting module is respectively connected with the resonator and an external power supply, and the capacitance value of the variable capacitance diode is adjusted by changing the voltage value of the external power supply, so that the working bandwidth of the resonator can be adjusted.
Furthermore, the bandwidth adjustment module comprises at least one bias component and bias ports corresponding to the bias components one to one, wherein one end of the bias component is connected with one end of the varactor diode, and the other end of the bias component is connected with the corresponding bias port; the bias component comprises a bias resistor and a bias capacitor which are connected in series; the bias port is connected with the external power supply.
Further, the bias components correspond to the varactors one to one.
Further, the feed board comprises a first horizontal layer and a second horizontal layer which are arranged in parallel; the input port, the first output port, and the second output port are disposed on the first horizontal layer.
Furthermore, the first horizontal layer is provided with a through hole surface, and the through hole surface is connected with the connection end of the gradual change structure strip line and the input port; the second horizontal layer is provided with a horizontal ground plane; the via plane and the horizontal ground plane are connected by at least one first metal via.
Furthermore, the first metal via holes are multiple and distributed in a matrix form.
Further, the mounting plate comprises a first vertical layer and a third vertical layer which are arranged in parallel; the gradient structure strip line is arranged on the third vertical layer; and the vertical double-sided parallel strip lines in the resonator and the quarter-wave impedance transformer are respectively and symmetrically arranged on the first vertical layer and the third vertical layer.
Further, the mounting board further includes a second vertical layer including a vertical ground plane, the resonator being electrically connected to the vertical ground plane.
Further, the resonator includes: the three-quarter-wavelength band-pass filter comprises a first vertical double-sided parallel strip line with a quarter wavelength, a second vertical double-sided parallel strip line with a three-quarter wavelength, two series varactor diodes and two parallel varactor diodes; the first vertical double-sided parallel strip line and the second vertical double-sided parallel strip line in the first vertical layer are connected in parallel;
the first double-sided parallel stripline in the first vertical layer comprises a left half part and a right half part, the left half part and the right half part are connected in series through the series varactor, one end of the parallel varactor is connected with the middle part of the second vertical double-sided parallel stripline, and the other end of the parallel varactor is grounded; the resonators are located in the first vertical layer and the third vertical layer in the same structure.
Further, the resonator further comprises four first blocking capacitors; the first blocking capacitors are respectively connected in series at two ends of the second vertical double-sided parallel strip line, and the first vertical double-sided parallel strip line is connected in parallel with the second vertical double-sided parallel strip line, the two ends of which are connected in series with the first blocking capacitors.
Further, the mounting plate also comprises two second metal through holes with the same structure; and the grounding ends of the two parallel variable capacitance diodes are respectively connected with the vertical grounding surface through the second metal via hole.
Further, the bandwidth adjustment module comprises a first biasing component, a second biasing component, a first biasing port and a second biasing port; one end of the first bias component is connected with the first bias port, and the other end of the first bias component is connected with one end of the series varactor; one end of the second bias assembly is connected with the second bias port, and the other end of the second bias assembly is connected with one end of the parallel varactor connected with the second vertical double-sided parallel strip line.
Further, the first bias component is a series circuit of a first bias inductor and a first bias resistor which are respectively positioned on the first vertical layer and the third vertical layer; one end of a series circuit of the first bias inductor and the first bias resistor is connected with the first bias port, and the other end of the series circuit of the first bias inductor and the first bias resistor is connected with one end of the series varactor.
Furthermore, the first bias assembly further comprises two third bias inductors respectively located on the first vertical layer and the third vertical layer, one end of each third bias inductor is connected with one end, opposite to the connection end of the series varactor diode and the series circuit of the first bias inductor and the first bias resistor, and the other end of each third bias inductor is grounded.
Further, the mounting board further comprises two third metal through holes with the same structure; and the grounding ends of the third bias inductors on the first vertical layer and the third vertical layer are respectively connected with the vertical grounding surface through the third metal via hole.
Further, the second bias component is a series circuit of a second bias inductor and a second bias resistor which are respectively located on the first vertical layer and the third vertical layer, one end of the series circuit of the second bias inductor and the second bias resistor is connected with the second bias port, and the other end of the series circuit of the second bias inductor and the second bias resistor is connected with one end of the parallel varactor diode which is connected with the second vertical double-sided parallel strip line.
Further, the feed board comprises a plurality of second blocking capacitors; a second blocking capacitor is connected in series between the input port and the connected microstrip line; and/or a second blocking capacitor is connected in series between the first output port and the connected microstrip line; and/or a second blocking capacitor is connected in series between the second output port and the connected microstrip line.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
1. the capacitance value of a variable capacitance diode in the resonator is changed by changing the preset voltage value of the external power supply, so that the stereo balun not only integrates broadband filtering, but also has adjustable working frequency band, and meets the requirement of radio system performance follow-up;
2. through adopting spatial structure's balun, make the level ground of balun complete, simplified the metal shielding box later stage installation operation, reduced the installation degree of difficulty, and effectively avoided the parasitic resonance that causes between traditional double-sided parallel strip line and shielding box.
Drawings
Fig. 1 is a schematic structural diagram of a miniaturized filtering integrated stereo balun with adjustable bandwidth provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mounting plate of a miniaturized filtering integrated stereo balun with adjustable bandwidth, provided by an embodiment of the present invention;
FIG. 3 is an equivalent circuit schematic diagram of a miniaturized filter integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention;
fig. 4 is a schematic simulation curve diagram of a miniaturized filter integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention;
fig. 5 is a schematic test curve diagram of a miniaturized filter integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention.
Reference numerals:
1. a feed plate, 11, a first horizontal layer, 111, a via plane, 112, a first metal via, 12, a second horizontal layer, 13, an input port, 14, a first output port, 15, a second output port, 16, a second blocking capacitor, 2, a mounting board, 21, a first vertical layer, 22, a second vertical layer, 221, a vertical ground plane, 23, a third vertical layer, 24, a graded structure strip line, 25, a resonator, 251, a first vertical double-sided parallel strip line, 252, a second vertical double-sided parallel strip line, 253, a series varactor, 254, a parallel varactor, 255, a first blocking capacitor, 26, a quarter-wavelength impedance transformer, 271, a second metal via, 272, a third metal via, 28, a virtual input port, 29, a virtual output port, 31, a first bias circuit, 311, a first bias inductor, 312, a first bias resistor, 313, a second bias circuit, a third bias circuit, a fourth bias circuit, A third bias inductance; 32. second bias circuit, 321, second bias inductance, 322, second bias resistance, 33, first bias port, 34, second bias port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic structural diagram of a miniaturized filtering integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a mounting plate of a miniaturized filtering integrated stereo balun with adjustable bandwidth, provided by an embodiment of the present invention.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a miniaturized filtering integrated stereo balun with adjustable bandwidth, including: a feeding board 1 which is horizontally arranged and a mounting board 2 which is vertically mounted on the feeding board 1. The feeder panel 1 includes: an input port 13, a first output port 14 and a second output port 15 electrically connected to the mounting board 2 through microstrip lines, respectively. The mounting plate 2 includes: the gradual change structure strip line 24, the resonator 25 and the quarter-wavelength impedance transformer 26 which are connected in sequence further comprise: a bandwidth adjustment module; the resonator 25 is a resonant network comprising vertical double-sided parallel strip lines and a plurality of varactors. The quarter wave impedance transformer 26 is a vertical double-sided parallel stripline structure. The bandwidth adjusting module is respectively connected with the resonator 25 and an external power supply, and the capacitance value of the varactor diode is adjusted by changing the voltage value of the external power supply, so that the working bandwidth of the resonator 25 can be adjusted. The capacitance value of the variable capacitance diode in the resonator is changed by changing the preset voltage value of the external power supply, so that the three-dimensional balun not only integrates broadband filtering, but also has adjustable working frequency band, and meets the requirement of radio system performance follow-up; by adopting the balun with the three-dimensional structure, the horizontal ground of the balun is complete, the mounting process of the shielding box is simplified, and the mounting difficulty is reduced.
The bandwidth adjusting module comprises at least one bias component and bias ports corresponding to the bias components one to one, one end of each bias component is connected with one end of each variable capacitance diode, and the other end of each bias component is connected with the corresponding bias port. The bias component comprises a bias resistor and a bias capacitor which are connected in series. The bias port is connected with an external power supply.
The bias components correspond to the varactors one-to-one.
The feed board 1 comprises a first horizontal layer 11 and a second horizontal layer 12 which are arranged in parallel; an input port 13, a first output port 14 and a second output port 15 are provided on the first horizontal layer 11.
The first horizontal layer 11 is provided with a via hole surface 111, and the via hole surface 111 is connected with the connection end of the gradual change structure strip line 24 and the input port 13; the second horizontal layer 12 is provided with a horizontal ground plane; the via plane 111 and the horizontal ground plane are connected by at least one first metal via 112.
Optionally, the first metal vias 112 are multiple, and the multiple first metal vias 112 are distributed in a matrix form. Preferably, the number of the plurality of first metal vias 112 is 10. The 10 first metal vias 112 are arranged in a matrix. The first metal via holes 112 are arranged in a matrix form, so that the via hole surface 111 and the horizontal ground surface are more fully connected, and the grounding effect of the via hole surface 111 is improved.
The feed line of the input port 13, and/or the feed line of the first output port 14, and/or the feed line of the second output port 15 is a microstrip line. The microstrip line is a microwave transmission line formed by a single conductor strip on a dielectric substrate, is suitable for manufacturing a planar transmission line of a microwave integrated circuit, has the advantages of small volume, light weight, wide use frequency band, high reliability and low manufacturing cost compared with a metal waveguide, is easy to be connected with a solid device, and is convenient for integration of a microwave component and a system.
Optionally, the input port, and/or the first output port, and/or the second output port is an SMA interface. The SMA interface has two forms, wherein the standard SMA interface is an external thread and a hole at one end and an internal thread and a needle at the other end; the reversed polarity RP-SMA is an external thread and a needle at one end, an internal thread and a hole at the other end, and most of SMA interfaces adopt an RP-SMA interface form.
The feed plate 1 further comprises a plurality of second dc blocking capacitors 16. A second blocking capacitor 16 is connected in series between the input port 13 and the connected microstrip line; and/or a second blocking capacitor 16 is connected in series between the first output port 14 and the connected microstrip line; and/or a second blocking capacitor 16 is connected in series between the second output port 15 and the connected microstrip line. The second blocking capacitors connected in series with the input port 13, the first output port 14 and the second output port 15 on the feed board 1 isolate the direct current in the three-dimensional balun, so that the direct current is prevented from damaging the test equipment in the test process, and the safety of the test equipment is improved.
The mounting board 2 includes a first vertical layer 21 and a third vertical layer 23 arranged in parallel; the graded-structure strip line 24 is disposed on the third vertical layer 23; the vertical double-sided parallel strip lines in the resonator 25 and the quarter-wave impedance transformer 26 are symmetrically arranged on the first vertical layer 21 and the third vertical layer 23, respectively.
The mounting board 2 further comprises a second vertical layer 22, the second vertical layer 22 comprising a vertical ground plane 221, the resonator 25 being electrically connected to the vertical ground plane 221.
Optionally, the strip line 24 with the gradual change structure is trapezoidal, the width of the top edge of the trapezoid is the same as that of the microstrip line, and the length of the bottom of the trapezoid is smaller than the length of the longest side of the via surface. The strip line 24 with the gradual change structure is positioned on the third vertical layer 23, and the input port 13 of the feed board 1, the via hole surface 111 and the resonator 25 of the mounting board 2 are connected together through the microstrip line, so that the transition from the microstrip line to the vertical double-sided parallel strip line is gradually completed.
In the first vertical layer 21, the microstrip line connected to the input port 13 is connected to the input terminal of the resonator 25, the output terminal of the resonator 25 is connected to the input terminal of the quarter-wave impedance transformer 26, and the output terminal of the quarter-wave impedance transformer 26 is connected to the first output port 14 through the microstrip line; in the third vertical layer 23, the microstrip line connected to the input port 13 is connected to the via hole surface 111 and the bottom end of the gradient structure strip line 24, the top end of the gradient structure strip line 24 is connected to the input end of the resonator 25, the output end of the resonator 25 is connected to the input end of the quarter-wavelength impedance transformer 26, and the output end of the quarter-wavelength impedance transformer 26 is connected to the second output port 15 through the microstrip line.
The resonator 25 includes: a first vertical double-sided parallel strip line of one quarter wavelength 251, a second vertical double-sided parallel strip line of three quarters wavelength 252, two series varactors 253, and two parallel varactors 254; the first vertical double-sided parallel strip line 251 and the second vertical double-sided parallel strip line 252 in the first vertical layer 21 are connected in parallel; the first double-sided parallel stripline 251 in the first vertical layer 21 includes a left half and a right half, which are connected in series by a series varactor 253, one end of a parallel varactor 254 is connected to the middle portion of the second vertical double-sided parallel stripline 252, and the other end is grounded; the resonator 25 is located in the first vertical layer 21 and the third vertical layer 23 in the same structure.
Optionally, the resonator 25 further includes four first dc blocking capacitors 255; the first blocking capacitors 255 are respectively connected in series to two ends of the second vertical double-sided parallel strip line 254, and the first vertical double-sided parallel strip line 253 is connected in parallel to the second vertical double-sided parallel strip line 254, the two ends of which are connected in series with the first blocking capacitors 255. The first blocking capacitors 255 are connected in series at two ends of the first vertical double-sided parallel strip line 251, so that independent control over the series variable capacitance diodes 253 and the parallel capacitance diodes 254 is realized, and the frequency band adjustment of the three-dimensional balun is more flexible and accurate.
The mounting board 2 further comprises two second metal vias 271 with the same structure; the ground terminals of the two parallel varactors 254 are connected to the vertical ground plane 221 through second metal vias 271, respectively.
Optionally, the vertical projection positions of the two second metal vias 271 on the second vertical layer 22 are the same.
The bandwidth adjustment module comprises a first bias component 31, a second bias component 32, a first bias port 33 and a second bias port 34; one end of the first biasing component 31 is connected to the first biasing port 33 and the other end is connected to one end of the series varactor 253; the second bias assembly 32 has one end connected to the second bias port 34 and the other end connected to one end of the parallel varactor 254 connected to the second vertical double-sided parallel stripline 252. When the preset voltage values applied to the first bias port 33 and the second bias port 34 are changed, the capacitance values of the series varactor 253 and the parallel varactor 254 in the resonator 25 are also changed, so that the operating frequency band of the resonator 25 is changed, the operating frequency band of the stereo balun is finally changed, and the dynamic adjustment of the operating frequency band of the stereo balun is realized.
The first bias component 31 is a series circuit of a first bias inductor 311 and a first bias resistor 312 respectively positioned on the first vertical layer 21 and the third vertical layer 23; a series circuit of the first bias inductor 311 and the first bias resistor 312 has one end connected to the first bias port 33 and the other end connected to one end of the series varactor 254.
The first biasing assembly 31 further comprises two third biasing inductors 313 located in the first vertical layer 21 and the third vertical layer 23, respectively, one end of the third biasing inductor 313 being connected to the end of the series varactor 253 opposite to the connection end of the series circuit of the first biasing inductor 311 and the first biasing resistor 312, and the other end being connected to ground.
The mounting board 2 further includes two third metal vias 272 of the same structure; the ground terminals of the third bias inductors 313 on the first vertical layer 21 and the third vertical layer 23 are connected to the vertical ground plane 221 through third metal vias 272, respectively.
The second bias component 32 is a series circuit of a second bias inductor 321 and a second bias resistor 322 respectively located on the first vertical layer 21 and the third vertical layer 23, one end of the series circuit of the second bias inductor 321 and the second bias resistor 322 is connected with the second bias port 34, and the other end is connected with one end of the parallel varactor 254 connected with the second vertical double-sided parallel strip line 252.
The first bias inductor 311, the second bias inductor 321, and the third bias inductor 313 are used to isolate the rf signal of the resonator 25, and the first bias resistor 312 and the second bias resistor 322 are used to limit the current of the varactor diode of the resonator 25. In addition, the first bias inductor 311, the first bias resistor 321, the second bias inductor 33, the second bias resistor 34, and the third bias inductor 313 are symmetrically disposed in the first vertical layer 21 and the third vertical layer 23.
Optionally, the dielectric constant of the feeding board 1 is the same as that of the mounting board 2. In the selection of the PCB of the microwave rf module, the dielectric constant is an important technical parameter, which has a large influence on the index insertion loss of the rf microwave circuit, and the lower the dielectric constant is, the smaller the insertion loss of the PCB is. The dielectric constant is divided into a processing dielectric constant and a design dielectric constant, the processing dielectric constant is a nominal parameter of the PCB, and the design dielectric constant is an actually measured dielectric constant of the PCB and can be used for simulation. The dielectric constant is changed along with the temperature, the maximum change range can reach 20% in the temperature range of 0-70 degrees, the change of the dielectric constant can cause the change of 10% of the delay of the line, and the delay is larger at higher temperature. In order to make the signal transmission delay of the microwave radio-frequency signal in the feed board 1 consistent with that of the mounting board 2, the dielectric constant values of the feed board 1 and the mounting board 2 are all 3.48.
In one embodiment of the present invention, the thickness of the feeding board 1 is 0.762mm, and the thickness of the mounting board 2 is 2 × 0.508 mm.
Optionally, the first vertical double-sided parallel strip line 251, the second vertical double-sided parallel strip line 252, the vertical double-sided parallel strip line of the quarter-wavelength impedance transformer 26, the microstrip line, the via hole plane 111, the horizontal ground plane, and the vertical ground plane 221 are all made of conductive metal.
Preferably, the conductive metal is brass. Among conductive metals, copper has the best conductive capability, second only to silver, but has higher cost performance and wider application range compared with the high price of silver.
Fig. 3 is an equivalent circuit schematic diagram of a miniaturized filter integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention.
For convenience in describing embodiments of the present invention, the following definitions are made:
virtual input port 28: the connection part of the gradual change structure strip line 24 and the feeder line of the input port 13 is simultaneously connected with the through hole surface 111;
virtual output port 29: the junctions of the quarter-wave impedance transformers 26 of the first and third vertical layers 21, 23 of the mounting board 2 with the feed line of the first output port 14 and the feed line of the second output port 15, respectively;
the capacitance of the series varactor 253 is C1The capacitance of the parallel varactor 254 is C2；
Half of the impedance of the first vertical double-sided parallel strip line is defined as Z1The impedance of the first vertical double-sided parallel strip line is defined as 2Z1Electrical length of
Half of the impedance of the second vertical double-sided parallel strip line is defined as Z2The impedance of the second vertical double-sided parallel strip line is defined as 2Z2Electrical length of
The impedance of half of the third vertical double-sided parallel strip line is defined as Z3The impedance of the first vertical double-sided parallel strip line is defined as 2Z3Electrical length of theta3；
The first blocking capacitor is Cblock；
The first bias inductance 311 is Lbias1The second bias inductor 321 is Lbias2The third bias inductance 313 is Lbias3；
The first bias resistor 312 is Rbias1Second, secondBias resistor 322 is Rbias2；
The first bias port 33 is applied with a voltage V1The second bias port 34 applies a voltage V2。
As shown in fig. 3, the virtual input port 28 and the virtual output port 29 are two virtual ports of the mounting board 2.
Two series varactors 253 and two parallel varactors 254 are introduced on the basis of a conventional ring resonator. In which two series varactors 253 (equivalent to C for the overall capacitance value)1/2) first vertical double-sided parallel strip line 251 (2Z) located at a quarter wavelength1，
) Two parallel varactors 254 (overall capacitance value is equivalent to C)2/2) one end with a second vertical two-sided parallel strip line 252 (2Z) of three-quarters wavelength2，
) Is connected with the other end of the connecting rod, and the other end of the connecting rod is grounded. Quarter-wave impedance transformer 26 (2Z)3，
) The equivalent output impedance of the resonator 25 is ideally matched to the virtual output port 29.
The output signals of the first output port 14 and the second output port 15 are in equal amplitude and opposite phase, and the virtual output port 29 is equivalent to two output ports connected in series and has an impedance of 2ZL. According to the mirror theory, inserting the vertical ground plane 221 to the middle of the vertical double-sided parallel strip line does not change its electric field distribution.
Referring to fig. 2, an arbitrary section of vertical double-sided parallel strip line (impedance of 2Z) on the mounting board 2iElectrical length of thetaiThe thickness of the dielectric plate is 2h2) Can be regarded as two microstrip lines (with impedance of Z) arranged back to back on the same dielectric plateiElectrical length of thetaiThe thickness of the dielectric plate is h2). Similarly, it is placed on the mounting plate 2The equivalent capacitance value of a pair of varactors at symmetrical positions of one vertical layer 21 and the third vertical layer 23 is half of the original value. Due to the gradual change structure, the virtual input port 28 is still equivalent to a section of ordinary microstrip line, and the impedance of the microstrip line is ZS。
Fig. 4 is a simulation curve diagram of the bandwidth-adjustable miniaturized filter integrated stereo balun provided by the embodiment of the present invention.
Fig. 5 is a schematic test curve diagram of a miniaturized filter integrated stereo balun with adjustable bandwidth according to an embodiment of the present invention.
In one embodiment of the present invention, the operating frequency of the stereo balun is 1.53GHz, and the termination impedance and other impedances (in Ω): ZS＝50，ZL＝50，Z1＝25，Z2＝37.5，Z335.35, electrical length (unit: °): theta1＝90，θ2＝270，θ3The bias network parameters are 90: rbias1＝Rbias2＝10.0kΩ，Lbias1＝Lbias2＝Lbias3＝3.3μH，C block10 μ F. The corresponding dimension is optimized as follows (unit: mm): L0＝10.00，W0＝1.72，L1＝14.20，W1＝3.05，L2＝32.00，W2＝1.77，L3＝3.00，W3＝1.60，L4＝18.00，W4＝2.30，W5＝8.30。
Referring to FIGS. 4 and 5, the matching performance | S from the input port 1311Transmission performance | S of | first output port 14 and second output port 1521|、|S31And the phase difference ∠ S between the first output port 14 and the second output port 1521-∠S31It can be seen that when | S11A capacitance C, | lower than-10 dB, of the series varactor 2531Capacitance value of (1), capacitance C of the parallel varactor 2542The capacitance values of (14.0pF, 19.1pF), (14.0pF, 7.0pF), (8.2pF, 10.0pF) respectively, and the bandwidths of the simulated operating bands are respectively 1.10GHz (0.85GHz-1.95GHz), 0.76GHz (1.12GHz-1.88GHz), 0.97GHz (0.99GHz-1.96 GHz). Correspondingly, the first bias port 33 is energizedPressure value V1A voltage value V applied to the second bias port 342Respectively (1.0V, 0.3V), (1.0V, 3.3V), (2.7V, 2.0V), and the bandwidth of the test operating band is 1.23GHz (0.69GHz-1.92GHz), 0.87GHz (1.00GHz-1.87GHz), 1.12GHz (0.83GHz-1.95GHz), all the tuning cases mentioned above are in the 0.97GHz-2.19GHz band, ∠ S21-∠S31Both during simulation and testing were maintained within-180 ° ± 20 °. Simulating | S in the adjustable range of 1.15GHz-1.95GHz21|、|S31The | remains within-3.1 ± 1.7 dB. However, test | S21|、|S31The | reaches-5.6 dB in 1.13GHz-1.54GHz, and the generated error can be attributed to the parasitic effect brought by the bias network.
The embodiment of the invention aims to protect a miniaturized filtering integrated stereo balun with adjustable bandwidth, which comprises the following steps: the feed board is horizontally arranged and the mounting board is vertically arranged on the feed board; the feed panel includes: the input port, the first output port and the second output port are electrically connected with the mounting plate through microstrip lines respectively; the mounting panel includes: gradual change structure band wire, resonator and the quarter wavelength impedance transformer that connects gradually still include: a bandwidth adjustment module; the resonator is a resonant network comprising vertical double-sided parallel strip lines and a plurality of variable capacitance diodes; the quarter-wave impedance converter is in a vertical double-sided parallel strip line structure; the bandwidth adjusting module is respectively connected with the resonator and an external power supply, and the capacitance value of the variable capacitance diode is adjusted by changing the voltage value of the external power supply, so that the working bandwidth of the resonator can be adjusted. The technical scheme has the following effects:
1. the capacitance value of the variable capacitance diode in the resonator is changed by changing the preset voltage value of the external power supply, so that the three-dimensional balun not only integrates broadband filtering, but also has adjustable working frequency band, and meets the requirement of radio system performance follow-up.
2. Through adopting spatial structure's balun, make the level ground of balun complete, simplified the metal shielding box later stage installation operation, reduced the installation degree of difficulty, and effectively avoided the parasitic resonance that causes between traditional double-sided parallel strip line and shielding box.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (16)
1. The utility model provides a three-dimensional balun of miniaturized filtering integration of bandwidth adjustable which characterized in that includes: the feed board (1) is horizontally arranged, and the mounting board (2) is vertically mounted on the feed board (1);
the feed board (1) comprises: an input port (13), a first output port (14) and a second output port (15) which are electrically connected with the mounting plate (2) through microstrip lines respectively;
the mounting plate (2) comprises: gradual change structure strip line (24), resonator (25) and quarter-wavelength impedance transformer (26) that connect gradually still include: a bandwidth adjustment module;
the resonator (25) is a resonant network comprising: a first vertical double-sided parallel strip line of one quarter wavelength (251), a second vertical double-sided parallel strip line of three quarters wavelength (252), two series varactors (253), and two parallel varactors (254);
the first vertical double-sided parallel strip line (251) and the second vertical double-sided parallel strip line (252) are connected in parallel;
the first vertical double-sided parallel strip line (251) comprises a left half and a right half, which are connected in series by the series varactor (253), one end of the parallel varactor (254) is connected to a middle portion of the second vertical double-sided parallel strip line (252), and the other end is grounded;
the bandwidth adjustment module comprises a first biasing component (31), a second biasing component (32), a first biasing port (33), and a second biasing port (34);
-one end of the first biasing component (31) is connected to the first biasing port (33) and the other end is connected to one end of the series varactor (253);
one end of the second biasing assembly (32) is connected with the second biasing port (34), and the other end is connected with one end of the parallel varactor (254) connected with the second vertical double-sided parallel strip line (252);
the quarter-wave impedance transformer (26) is of a vertical double-sided parallel strip line structure;
the bandwidth adjusting module is respectively connected with the resonator (25) and an external power supply, and the capacitance values of the series varactor (253) and the parallel varactor (254) of the resonator (25) are adjusted by changing the voltage value of the external power supply, so that the working bandwidth of the resonator (25) can be adjusted.
2. The miniaturized filter integrated stereo balun of claim 1,
the first biasing component (31) of the bandwidth adjustment module corresponds to the first biasing port (33), and the second biasing component (32) corresponds to the second biasing port (34);
the first bias assembly (31) and the second bias assembly (32) both comprise a bias resistor and a bias inductor in series;
the first bias port (33) and the second bias port (34) are connected to the external power supply.
3. The miniaturized filter integrated stereo balun of claim 2,
the first biasing component (31) corresponds to the series varactor (253) and the second biasing component (32) corresponds to the parallel varactor (254).
4. The miniaturized filter integrated stereo balun of claim 1,
the feed board (1) comprises a first horizontal layer (11) and a second horizontal layer (12) which are arranged in parallel;
the input port (13), first output port (14) and second output port (15) are disposed on the first horizontal layer (11).
5. The miniaturized filter integrated stereo balun of claim 4,
the first horizontal layer (11) is provided with a through hole surface (111), and the through hole surface (111) is connected with the connection end of the gradual change structure strip line (24) and the input port (13);
the second horizontal layer (12) is provided with a horizontal ground plane;
the via plane (111) and the horizontal ground plane are connected by at least one first metal via (112).
6. The miniaturized filter integrated stereo balun of claim 5,
the first metal through holes (112) are multiple, and the first metal through holes (112) are distributed in a matrix form.
7. The miniaturized filter integrated stereo balun of claim 1,
the mounting plate (2) comprises a first vertical layer (21) and a third vertical layer (23) which are arranged in parallel;
the gradient structure strip line (24) is arranged on the third vertical layer (23);
the vertical double-sided parallel strip lines in the resonator (25) and the quarter-wave impedance transformer (26) are symmetrically arranged on the first vertical layer (21) and the third vertical layer (23) respectively.
8. The miniaturized filter integrated stereo balun of claim 7,
the mounting board (2) further comprises a second vertical layer (22), the second vertical layer (22) comprising a vertical ground plane (221), the resonator (25) being electrically connected with the vertical ground plane (221).
9. The miniaturized filter integrated stereo balun of any one of claims 1-8,
the resonators (25) are located in the first vertical layer (21) and the third vertical layer (23) in the same structure.
10. The miniaturized filter integrated stereo balun of claim 9,
the resonator (25) further comprises four first blocking capacitances (255);
the first blocking capacitors (255) are respectively connected in series with two ends of the second vertical double-sided parallel strip line (254), and the first vertical double-sided parallel strip line (253) is connected in parallel with the second vertical double-sided parallel strip line (254) of which two ends are connected in series with the first blocking capacitors (255).
11. The miniaturized filter integrated stereo balun of claim 9,
the mounting plate (2) further comprises two second metal through holes (271) with the same structure;
the grounding ends of the two parallel varactor diodes (254) are respectively connected with the vertical grounding plane (221) through the second metal via hole (271).
12. The miniaturized filter integrated stereo balun of claim 1,
the first bias component (31) is a series circuit of a first bias inductor (311) and a first bias resistor (312) which are respectively positioned on the first vertical layer (21) and the third vertical layer (23);
the series circuit of the first biasing inductance (311) and the first biasing resistance (312) has one end connected to the first biasing port (33) and the other end connected to one end of the series varactor (254).
13. The miniaturized filter integrated stereo balun of claim 12,
the first bias assembly (31) further comprises two third bias inductors (313) respectively positioned on the first vertical layer (21) and the third vertical layer (23), one end of each third bias inductor (313) is connected with one end of the series varactor (253) opposite to the connection end of the series circuit of the first bias inductor (311) and the first bias resistor (312), and the other end of each third bias inductor is grounded.
14. The miniaturized filter integrated stereo balun of claim 13,
the mounting plate (2) further comprises two third metal through holes (272) with the same structure;
the grounding ends of the third bias inductors (313) on the first vertical layer (21) and the third vertical layer (23) are respectively connected with the vertical grounding plane (221) through the third metal via holes (272).
15. The miniaturized filter integrated stereo balun of claim 1,
the second bias assembly (32) is a series circuit of a second bias inductor (321) and a second bias resistor (322) which are respectively located on the first vertical layer (21) and the third vertical layer (23), one end of the series circuit of the second bias inductor (321) and the second bias resistor (322) is connected with the second bias port (34), and the other end of the series circuit of the second bias inductor (321) and the second bias resistor (322) is connected with one end of the parallel varactor diode (254) which is connected with the second vertical double-sided parallel strip line (252).
16. The miniaturized filter integrated stereo balun of claim 1,
the feed board (1) comprises a plurality of second blocking capacitors (16);
a second blocking capacitor (16) is connected in series between the input port (13) and the connected microstrip line; and/or
A second blocking capacitor (16) is connected in series between the first output port (14) and the connected microstrip line; and/or
And a second blocking capacitor (16) is connected in series between the second output port (15) and the connected microstrip line.
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| US9935354B2 (en) * | 2015-04-17 | 2018-04-03 | The United States Of America, As Represented By The Secretary Of The Navy | Frequency tunable balun |
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| CN108123196B (en) * | 2017-12-25 | 2020-06-02 | 北京邮电大学 | Broadband filtering integrated stereo balun based on vertical double-sided parallel strip lines |
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