CN103779640A - Micro-strip dual-passband filter - Google Patents
Micro-strip dual-passband filter Download PDFInfo
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- CN103779640A CN103779640A CN201410019987.1A CN201410019987A CN103779640A CN 103779640 A CN103779640 A CN 103779640A CN 201410019987 A CN201410019987 A CN 201410019987A CN 103779640 A CN103779640 A CN 103779640A
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Abstract
The invention discloses a micro-strip dual-passband filter used in an ultra wide band system and a narrow band system, and pertains to the technical field of wireless communication. The micro-strip dual-passband filter of the invention comprises a first filter and a second filter sharing a common feeder and an input/output port. The first filter comprises a first resonator, a second resonator and a third resonator which are in an interdigital line structure to generate a first passband. The second filter comprises a first resonator, a third resonator and a U-shaped resonator of which the middle portion is loaded with a third short-circuit branch to generate a second passband. The first to third resonators are all located in the U-shaped resonator. The short-circuit end of the third short-circuit branch coincides with the short-circuit end of the second resonator. The first resonator and the third resonator are high-impedance feeders of the second filter. According to the invention, parameters of the two passbands are adjusted independently, the passbands have advantages of high frequency selectivity and high isolation, the circuit structure is compact, the insertion loss is relatively small, and the communication quality can be improved.
Description
Technical field
The present invention relates to a kind of double-passband filter, is specifically a kind of micro-band double-passband filter that is applied to radio ultra wide band system and narrowband systems, belongs to wireless communication technology field.
Background technology
Along with the extensive use of the develop rapidly of modern communication technology, particularly WLAN (wireless local area network), many passbands communication system of the present various communication resources of compatibility has become the focus of research simultaneously.At present, modal is bilateral band communication system, and double-passband filter is as the requisite device of front end of bilateral band communication system, becomes the key of research bilateral band communication system.
The method for designing of double-passband filter is a lot, mainly contains two kinds: the first is to adopt to have the single resonator of turnable resonator frequency, and the filter major defect that this method obtains is that the bandwidth of two passbands cannot independent regulation; The second is to adopt two kinds of different resonators, makes it share identical input and output side, and two bandwidth of filter that obtain like this can regulate mutually.In currently available technology, adopt the filter of second method design conventionally to have very complicated circuit structure, the comb filter that is particularly applied to broadband or radio ultra wide band system is relatively little.
On June 20th, 2012, Chinese invention patent application CN102509822A discloses a kind of Double-band-pass microstrip filter, as shown in Figure 1, comprise two groups of the first sub-microstrip filter and second sub-microstrip filters that structure is different, and first signal transmission line and secondary signal transmission line, this first signal transmission line is connected and connects signal input part with this first sub-microstrip filter and the second sub-microstrip filter respectively, this secondary signal transmission line is connected and connects signal output part with this first sub-microstrip filter and the second sub-microstrip filter respectively, make this first sub-microstrip filter and the second sub-microstrip filter parallel connection.This Double-band-pass microstrip filter can two passbands of independent regulation centre frequency, bandwidth and band internal characteristic, but its internal circuit complex structure, Insertion Loss is large, frequency selectivity is poor, relatively poor at isolation between passband.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned defect, provide a kind of simple in structure, frequency selectivity good, the higher micro-band double-passband filter that is applied to radio ultra wide band system and narrowband systems of isolation between passband.
In order to solve the problems of the technologies described above, micro-band double-passband filter provided by the invention, comprises the first filter and second filter of share common feeder line and input/output port; Described the first filter comprises the first resonator, the second resonator and the 3rd resonator that adopt interdigital linear structure composition, produces the first passband; Described the second filter comprises that the first resonator, the 3rd resonator and centre position load the U-shaped resonator of the 3rd short circuit minor matters, produce the second passband; Described the first to three resonator is all positioned at U-shaped resonator, and the short-circuit end of the 3rd short circuit minor matters overlaps with the short-circuit end of the second resonator; Described the first resonator and the 3rd resonator are the high impedance feeder line of the second filter.
In the present invention, described common feeder line comprises the first feeder line and the second feeder line; Vertical being connected distinguished with the short-circuit end of the first resonator and the 3rd resonator in one end of described the first feeder line and the second feeder line, and the other end is respectively as the first filter and the common input/output end port of the second filter.
In the present invention, also comprise the first short circuit minor matters, the second short circuit minor matters, described the first short circuit minor matters are carried on the first feeder line, produce a transmission zero at the lower limb of the first passband; Described the second short circuit minor matters are carried on the second feeder line, produce a transmission zero at the top edge of the second passband.
In the present invention, also comprise be positioned at the first short circuit minor matters outside, for the 4th resonator of reversion L-type structure be positioned at the second short circuit minor matters outside, the 5th resonator for forward L-type structure; The short-circuit end position opposite of the short-circuit end of described the 4th resonator and the first short circuit minor matters, produces a transmission zero in the upper edge of the first passband; The short-circuit end position opposite of the short-circuit end of described the 5th resonator and the second short circuit minor matters, produces a transmission zero in the lower edge of the second passband.
In the present invention, described the first feeder line and the second feeder line, near place's formation source-load coupling, produce a transmission zero in the lower edge of the first passband.
In the present invention, between described the first resonator and the 3rd resonator, be coupled, produce a transmission zero in the upper edge of the second passband.
In the present invention, the length of described the first to three resonator is identical, and its length is 1/4th of the first passband centre frequency corresponding wavelength.
In the present invention, the length of described U-shaped resonator is 1/2nd of the second passband centre frequency corresponding wavelength.
In the present invention, the length of described the 4th resonator and the 5th resonator be respectively the first passband upper edge and the second passband lower edge two transmission zero frequency corresponding wavelength 1/4th.
Beneficial effect of the present invention is: the parameter of (1), two passbands of the present invention is independently adjusted, and passband has very high frequency selectivity and very high isolation; (2), double-passband filter of the present invention is by common resonant device, feeder line and input/output port, makes circuit structure compactness, Insertion Loss is relatively little, has improved communication quality.
Accompanying drawing explanation
Fig. 1 is a kind of Double-band-pass microstrip filter of the prior art;
Fig. 2 is the micro-printed circuit board (PCB) tangent plane schematic diagram with double-passband filter of the present invention;
Fig. 3 is the micro-structural representation that is positioned at medium substrate upper strata with double-passband filter of the present invention;
Fig. 4 is the micro-structural representation with the first filter in double-passband filter of the present invention;
Fig. 5 is the micro-structural representation with the second filter in double-passband filter of the present invention;
Fig. 6 is the micro-grounding through hole schematic diagram that is positioned at medium substrate lower floor with double-passband filter of the present invention;
Fig. 7 is the micro-scattering parameter curve with the first filter separate responses in double-passband filter of the present invention;
Fig. 8 is the micro-scattering parameter curve with the second filter separate responses in double-passband filter of the present invention;
Fig. 9 is the micro-scattering parameter simulate and test result with double-passband filter of the present invention;
Figure 10 is micro-group delay emulation and the test result with double-passband filter of the present invention;
In figure: 1, the first feeder line; 2, the second feeder line; 3, the first resonator; 4, the second resonator; 5, the 3rd resonator; 6, the 4th resonator; 6-1, the first grounding through hole; 7, the 5th resonator; 7-1, the second grounding through hole; 8, U-shaped resonator; 9, the first short circuit minor matters; 9-1, the 3rd grounding through hole; 10, the second short circuit minor matters; 10-1, the 4th grounding through hole; 11, the 3rd short circuit minor matters; 12, the 5th grounding through hole; 13, source-load coupling region; S1, medium substrate; S2, upper strata metal; S3, lower metal; P1, input port/output port; P2, output port/input port.
Embodiment
The micro-band double-passband filter that the present invention is applied to radio ultra wide band system and narrowband systems below in conjunction with accompanying drawing is described in further detail.Wherein, the radio ultra wide band system of ultra broadband passband take centre frequency as 3.1GHz is example explanation; Arrowband passband take centre frequency at the wireless local area network (WLAN) system of 5.2GHz as example explanation.
As shown in Figure 2, in the micro-printed circuit board (PCB) with double-passband filter of the present invention, its relative dielectric constant is 2.2, and thickness is 0.508mm, can certainly adopt the medium substrate of other specifications.Upper and lower surface at the dielectric substrate S1 of medium substrate is coated with respectively metal level S2 and lower metal layer S3, and the filter in the present invention is formed at upper metal layers, and lower metal layer forms ground plane.
As shown in Figure 3, the micro-band double-passband filter of the present invention comprises the first feeder line 1, the second feeder line 2, the first resonator 3, the second resonator 4, the 3rd resonator 5, the 4th resonator 6, the 5th resonator 7, U-shaped resonator 8, the first short circuit minor matters 9, the second short circuit minor matters 10, the 3rd short circuit minor matters 11.As shown in Figure 4, the first feeder line 1, the second feeder line 2, the first resonator 3, the second resonator 4, the 3rd resonator 5 form the first filter, produce the first passband.Between the first resonator 3, the second resonator 4, the 3rd resonator 5, adopt interdigital linear structure setting, its length is centre frequency and the bandwidth of the 1/4th, first passband of the first passband central frequency corresponding wavelength and adjusts by the first resonator 3, the second resonator 4, the length of the 3rd resonator 5 and the spacing between them.The first resonator 3, the second resonator 4, the 3rd resonator 5 all have an open circuit termination and short circuit termination, wherein the short circuit termination of the first resonator 3 and the 3rd resonator 5 respectively with vertical being connected of one end of the first feeder line 1 and the second feeder line 2, the other end of the first feeder line 1 and the second feeder line 2 is respectively as input and output port (input/output port can exchange) P1, P2, the characteristic impedance of the first feeder line 1 and the second feeder line 2 and input and output port P1, P2 impedance phase are together, all the other microstrip line circuit impedances are identical, and width is identical; The short circuit termination of the second resonator 4 is by connecting the 5th grounding through hole 12 short circuits.As shown in Figure 5, the U-shaped resonator 8 of the first feeder line 1, the second feeder line 2, the first resonator 3 and the 3rd resonator 5 and center loaded the 3rd short circuit minor matters 11 forms the second filter, produces the second passband; The length of U-shaped resonator 8 is that centre frequency and the bandwidth of the 1/2nd, second passband of the second passband centre frequency corresponding wavelength can regulate by the length of U-shaped resonator 8 and the 3rd short circuit minor matters 11 respectively.As shown in Figure 3, the first filter and the second filter have identical feeder line and input/output port, the first resonator 3, the second resonator 4, the 3rd resonator 5 are all positioned at U-shaped resonator 8, the first resonator 3 and the 3rd resonator 5 provide close coupling as the high impedance feeder line of the second filter, the 3rd short circuit minor matters 11 load on the interior centre position of U-shaped resonator 8, the 3rd short circuit minor matters 11 short-circuit ends overlap with the short circuit termination of the second resonator 4, realize by connecting the 5th grounding through hole 12.As shown in Fig. 3,4,5, the first feeder line 1 and the second feeder line 2, mutually near place's formation source-load coupling 13, can form a transmission zero in the lower edge of the first passband; Coupling between the first resonator 3 and the 3rd resonator 5 can produce a transmission zero in the upper edge of the second passband.As shown in Figure 3, the first short circuit minor matters 9 load on the first feeder line 1, one end open circuit termination, and other end short circuit termination, by the 3rd grounding through hole 9-1 short circuit, can produce a transmission zero at the first passband lower limb; The second short circuit minor matters 10 load on the second feeder line 2, one end open circuit termination, and other end short circuit termination, by the 4th grounding through hole 10-1 short circuit, can produce a transmission zero at the top edge of the second passband; The 4th resonator 6 and the 5th resonator 7 are bending type resonator, wherein the 4th resonator 6 adopts the L-type structure of reversion, be positioned at outside and its coupling of the first short circuit minor matters 9, one terminal shortcircuit terminal is by the first grounding through hole 6-1 short circuit, the other end is open circuit termination, and the short-circuit end position opposite of its short-circuit end and the first short circuit minor matters 9, can produce a transmission zero in the upper edge of the first passband, and the length of the 4th resonator 6 is 1/4th of this transmission zero frequency corresponding wavelength.The 5th resonator 7 adopts the L-type structure of forward, be positioned at outside and its coupling of the second short circuit minor matters 10, one terminal shortcircuit terminal is by the second grounding through hole 7-1 short circuit, the other end is open circuit termination, and the short-circuit end position opposite of its short-circuit end and the second short circuit minor matters 10, can produce a transmission zero in the lower edge of the second passband, the length of the 5th resonator 7 is 1/4th of this transmission zero frequency corresponding wavelength.Above-mentioned transmission zero, can improve the frequency selectivity of passband, and isolation between two passbands.
As shown in Figure 6, the medium substrate lower floor of double-passband filter of the present invention, wherein the first grounding through hole 6-1 is the short-circuit end of the 4th resonator 6, the second grounding through hole 7-1 is the short-circuit end of the 5th resonator 7, the 3rd grounding through hole 9-1 is the short-circuit end of the first short circuit minor matters 9, the 4th grounding through hole 10-1 is the short-circuit end of the second short circuit minor matters 10, and the 5th grounding through hole 12 is the second resonator 4 and the total short-circuit end of the 3rd short circuit minor matters 11.
As shown in Figure 7, the first passband producing under micro-the first filter separate responses with double-passband filter of the present invention, its passband central frequency is 3.1GHz, its 3dB relative bandwidth is 70%, lower limb and upper edge at passband have respectively a transmission zero, have improved frequency selectivity.
As shown in Figure 8, the second passband producing under micro-the second filter separate responses with double-passband filter of the present invention, its passband central frequency is 5.2GHz, 3dB relative bandwidth is 4.5%, have a transmission zero in the upper edge of passband, and the U-shaped resonator that has loaded the 3rd short circuit minor matters is because parity mode is cancelled out each other produced a transmission zero below passband.
As shown in Figure 9, as can be seen from the figure simulation result and test result and simulation result coincide good.The first passband central frequency is at 3.1GHz, and its 3dB relative bandwidth reaches 73.2%, and in passband, its return loss is all less than 10dB; The second passband central frequency, at 5.2GHz, is applied to wireless local area network (WLAN) system, and its 3dB relative bandwidth is 4.8%.There are respectively two transmission zeros in the lower edge of the first passband and the upper edge of the second passband, the upper edge of the upper edge of the first passband and the second passband is respectively by a transmission zero, greatly improve the isolation between frequency selectivity and the passband of passband, this shows that double-passband filter of the present invention has very good performance.
For broadband and ultra-wide band filter, group delay is the parameter that characterizes its delay character that signal is caused.As shown in figure 10, can find out in first passband (ultra broadband passband) of filter group time, be 0.4ns to 0.7ns, group delay is very little, and has very smooth characteristic.
Micro-output port P1 and input port P2 with double-passband filter of the present invention all adopts the welding of SMA head, so that access is tested or is connected with circuit.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make under the premise without departing from the principles of the invention some improvement, and these improve and also should be considered as protection scope of the present invention.
Claims (9)
1. a micro-band double-passband filter, is characterized in that: the first filter and the second filter that comprise share common feeder line and input/output port; Described the first filter comprises the first resonator (3), the second resonator (4) and the 3rd resonator (5) that adopt interdigital linear structure composition, produces the first passband; Described the second filter comprises that the first resonator (3), the 3rd resonator (5) and centre position load the U-shaped resonator (8) of the 3rd short circuit minor matters (11), produce the second passband; Described the first to three resonator (3,4,5) is all positioned at U-shaped resonator (8), and the short-circuit end of the 3rd short circuit minor matters (11) overlaps with the short-circuit end of the second resonator (4); Described the first resonator (3) and the 3rd resonator (5) are the high impedance feeder line of the second filter.
2. micro-band double-passband filter according to claim 1, is characterized in that: described common feeder line comprises the first feeder line (1) and the second feeder line (2); Vertical being connected distinguished with the short-circuit end of the first resonator (3) and the 3rd resonator (5) in one end of described the first feeder line (1) and the second feeder line (2), the other end is respectively as the first filter and common I/O (P1, the P2) port of the second filter.
3. micro-band double-passband filter according to claim 1 and 2, it is characterized in that: also comprise the first short circuit minor matters (9), the second short circuit minor matters (10), it is upper that described the first short circuit minor matters (9) are carried in the first feeder line (1), produces a transmission zero at the lower limb of the first passband; It is upper that described the second short circuit minor matters (10) are carried in the second feeder line (2), produces a transmission zero at the top edge of the second passband.
4. micro-band double-passband filter according to claim 3, is characterized in that: also comprise be positioned at the first short circuit minor matters (9) outside, for the 4th resonator (6) of reversion L-type structure and be positioned at the second short circuit minor matters (10) outside, be the 5th resonator (7) of forward L-type structure; The short-circuit end position opposite of the short-circuit end of described the 4th resonator (6) and the first short circuit minor matters (9), produces a transmission zero in the upper edge of the first passband; (the short-circuit end position opposite of 7 short-circuit end and the second short circuit minor matters (10) produces a transmission zero in the lower edge of the second passband to described the 5th resonator.
5. micro-band double-passband filter according to claim 4, is characterized in that: described the first feeder line (1) and the second feeder line (2), near place's formation source-load coupling, produce a transmission zero in the lower edge of the first passband.
6. micro-band double-passband filter according to claim 5, is characterized in that: coupling between described the first resonator (3) and the 3rd resonator (5), produces a transmission zero in the upper edge of the second passband.
7. micro-band double-passband filter according to claim 6, is characterized in that: the length of described the first to three resonator (3,4,5) is identical, and its length is 1/4th of the first passband centre frequency corresponding wavelength.
8. micro-band double-passband filter according to claim 7, is characterized in that: the length of described U-shaped resonator (8) is 1/2nd of the second passband centre frequency corresponding wavelength.
9. micro-band double-passband filter according to claim 8, is characterized in that: the length of described the 4th resonator (6) and the 5th resonator (7) be respectively the first passband upper edge and the second passband lower edge two transmission zero frequency corresponding wavelength 1/4th.
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Cited By (5)
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| CN104201450A (en) * | 2014-07-04 | 2014-12-10 | 电子科技大学 | Micro-strip ultra wideband band-pass filter having wave trapping characteristic |
| CN105070998A (en) * | 2015-08-27 | 2015-11-18 | 华南理工大学 | Miniaturized cross connector with filtering function |
| CN105207639A (en) * | 2014-06-19 | 2015-12-30 | 中兴通讯股份有限公司 | Planar filter device |
| CN106602185A (en) * | 2016-12-07 | 2017-04-26 | 中国船舶重工集团公司第七〇九研究所 | Dual-bandpass filter based on nonsymmetric short circuit stub loaded resonator |
| CN115425376A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband filter based on branch knot loading |
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| CN105207639A (en) * | 2014-06-19 | 2015-12-30 | 中兴通讯股份有限公司 | Planar filter device |
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| CN105070998A (en) * | 2015-08-27 | 2015-11-18 | 华南理工大学 | Miniaturized cross connector with filtering function |
| CN105070998B (en) * | 2015-08-27 | 2018-05-15 | 华南理工大学 | A kind of miniaturization cross-connect with filter function |
| CN106602185A (en) * | 2016-12-07 | 2017-04-26 | 中国船舶重工集团公司第七〇九研究所 | Dual-bandpass filter based on nonsymmetric short circuit stub loaded resonator |
| CN106602185B (en) * | 2016-12-07 | 2019-10-11 | 中国船舶重工集团公司第七一九研究所 | A kind of double-passband filter based on Nonsymmetric Short Circuit minor matters load resonator |
| CN115425376A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband filter based on branch knot loading |
| CN115425376B (en) * | 2022-09-29 | 2023-09-08 | 河南科技大学 | Double-passband filter based on branch loading |
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