CN115064875A - Low-cost high-performance 5-bit programmable phased array antenna working in Ku wave band - Google Patents
Low-cost high-performance 5-bit programmable phased array antenna working in Ku wave band Download PDFInfo
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- CN115064875A CN115064875A CN202210776371.3A CN202210776371A CN115064875A CN 115064875 A CN115064875 A CN 115064875A CN 202210776371 A CN202210776371 A CN 202210776371A CN 115064875 A CN115064875 A CN 115064875A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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Abstract
The invention discloses a low-cost high-performance 5-bit programmable phased array antenna working in a Ku wave band, which consists of three parts, namely a reconfigurable radiation unit with 1-bit (180-degree) phase quantization, a digital phase shifter with 4-bit (168.75-degree) phase quantization and a feed network, wherein a radio frequency signal enters the antenna from a phased array antenna port, and the states of a PIN diode and a varactor diode loaded in the programmable phased array antenna are adjusted through an external voltage division control circuit to generate corresponding codes, so that high-precision beam scanning of 0-60 degrees is realized. Compared with the traditional phased array, the programmable phased array antenna does not need a large number of electronic phase shifters or T/R components, so that the programmable phased array antenna has the advantages of simple structure, low cost, planarization, easiness in integration of other devices, low loss and high application value in the microwave field.
Description
Technical Field
The invention relates to a low-cost high-performance 5-bit programmable phased array antenna working in a Ku wave band, which can be used in the fields of communication, radars, integrated circuits and the like.
Background
Phased array antennas are widely used in various wireless communication environments such as radar systems, target tracking and satellite communication systems due to their fast and high precision beam scanning capabilities. However, the introduction of a large number of electronic phase shifters or T/R elements in a conventional phased array undoubtedly results in high cost, large power consumption, and too large volume to be integrated with other elements.
The reconfigurable array antenna has the advantages of miniaturization, light weight, low cost, easy integration and the like. The directional diagram reconfigurable antenna plays an important role in a dynamic change scene, and has proved to have strong real-time beam adjustment capability. Therefore, the directional pattern reconfigurable array antenna is considered to be an alternative to the conventional phased array, receives more and more attention, and has been extensively studied on microwave circuits and antenna designs.
Disclosure of Invention
The technical problem is as follows: the invention aims to realize a 5-bit programmable phased array antenna which works in a Ku wave band, has low cost and high performance. The phased array antenna should have the characteristics of high-performance beam scanning capability, low cost, low profile, low loss, planarization, miniaturization, easy integration and the like.
The technical scheme is as follows: the invention relates to a low-cost high-performance 5-bit programmable phased array antenna working in a Ku wave band, which consists of three parts, including a reconfigurable radiation unit, a digital phase shifter with 4-bit 168.75-degree phase quantization and a feed network; they are respectively positioned on the upper part, the middle part and the lower part of the antenna to form a laminated structure; the phased-array antenna comprises two dielectric substrates and three metal layer structures, namely an upper metal layer, an upper dielectric substrate, a middle metal layer, an adhesive layer, a lower dielectric substrate and a lower metal layer from top to bottom in sequence; the upper metal layer is a radiation structure of the 5-bit programmable phased array antenna, the middle metal layer is a metal ground to prevent electromagnetic waves from leaking to the back of the antenna, and the lower metal layer is a feed structure of the 5-bit programmable phased array antenna; the two dielectric substrates are connected with the three metal layers through the bonding layers.
The thickness of the upper dielectric substrate is 1.524mm, and the dielectric constant is epsilon r 3.55, and a loss tangent σ of 0.0027.
The lower dielectric substrate is Rogers 4003C and is 0.203mm thick; the dielectric constant of the adhesive layer is epsilon r Rockwell 4450F with a loss tangent σ of 0.0027, 3.7, and a thickness of 0.1 mm.
The reconfigurable radiation unit is 24 multiplied by 2 reconfigurable radiation units with 1-bit 180-degree phase quantization.
The reconfigurable radiation unit comprises three parts, namely a radiation patch, a selectable feed structure and a bias circuit, and a phase difference with 180-degree stability is formed by utilizing the symmetry of an antenna structure; two rectangular grooves are distributed on the radiation patch in the direction of an electric field, and the slotted radiation patch has wider impedance bandwidth and lower cross polarization; the selectable feed structure is in a Y-shaped structure, the tail ends of the selectable feed structure are symmetrically provided with two first PIN diodes and two second PIN diodes with the models of MADP-14020-907, and the current paths of the electromagnetic waves on the selectable feed structure are selected by adjusting the switching states of the two PIN diodes; the bias circuit is used for isolating alternating current signals and isolating direct current signals respectively, the bias circuit for isolating the alternating current signals is composed of a first bias line, a second bias line, a first grounding capacitor and a second grounding capacitor, and the circuit for isolating the direct current signals is composed of a third capacitor connected in series to a signal input end.
The 4-bit 168.75 degree phase quantized digital phase shifter comprises a 3-dB impedance transformation branch line coupler (b1), two reflective loads and a direct current bias line; the branch line coupler uses a bent microstrip line, so that the area of the branch line coupler is reduced; the two reflection loads are connected to the terminal of the branch line coupler and consist of two variable capacitance diodes, namely a first variable capacitance diode, a first variable capacitance diode and two-end transmission lines; the varactor diode needs an external direct current bias voltage to change a capacitance value so as to generate phase shift; the direct current bias line is formed by connecting a grounding capacitor with a quarter-wavelength high-impedance line and has the function of isolating alternating current signals, and two DC blocking capacitors, namely a first DC blocking capacitor and a second DC blocking capacitor, are connected in series at the input end and the output end of the 4-bit 168.75-degree phase quantization digital phase shifter to play the role of isolating direct current signals.
The feed network is a 1:24 feed structure based on a coplanar waveguide structure, and the power division ratio of the feed network adopts Taylor distribution.
The states of the PIN diode and the variable capacitance diode are changed through an external voltage division circuit to generate corresponding codes, and beam scanning of 0-60 degrees is realized; wherein, at the radiated central frequency point of 14.8GHz, the scanning error of the phased array antenna under all scanning angles is less than 1 degree, the gain roll-off is less than 2.4dB, the side lobe level is less than-1 dB, and the cross polarization ratio is less than-26 dB.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. programmable beam scanning: the invention provides a 5-bit programmable phased array antenna working in a Ku waveband with low cost and high performance, which is characterized in that the states of a PIN diode and a varactor diode are changed through an external voltage division circuit to generate corresponding codes, thereby realizing 0-60-degree beam scanning. Compared to conventional phased arrays, there is no need to use a large number of electronic phase shifters or T/R components.
2. Simple structure, low cost, planarization, easily other device integration: compared with the traditional phased array, the invention does not need to use a large number of electronic phase shifters or T/R components, has low cost, simple structure and high integration level, and is easy to integrate other high-frequency/plane circuits while meeting the requirements of size miniaturization and planarization.
3. High beam scanning precision, low sidelobe level, low cross polarization ratio: the 5-bit programmable phased array antenna working in a Ku wave band has low cost and high performance, wherein at a radiated central frequency point (14.8GHz), the scanning error of the phased array antenna under all scanning angles is less than 1 degree, the gain roll-off is less than 2.4dB, the side lobe level is less than-1 dB, the cross polarization ratio is less than-26 dB, and the beam scanning performance is high.
Drawings
Fig. 1 is a block diagram of a reconfigurable radiating element with 1-bit (180 degree) phase quantization, wherein (a) the radiating element is shown in an exploded view; (b) an upper structure diagram of the radiation unit; (c) the lower structure of the radiation unit;
FIG. 2 is a graph of reconfigurable radiating element reflection coefficient simulation results with 1-bit (180 degree) phase quantization;
fig. 3 is a graph of the far field phase and phase difference of the electric field of the reconfigurable radiating element with 1-bit (180 degree) phase quantization when the reconfigurable radiating element works in the '0' state and the '1' state;
FIG. 4 shows the E-plane and H-plane main polarization and cross polarization directional diagrams of the reconfigurable radiation unit with 1-bit (180 degree) phase quantization, which work at the central frequency point (14.8 GHz); the polarization direction diagram comprises an E-plane main polarization direction diagram, (b) an E-plane cross polarization direction diagram, (c) an H-plane main polarization direction diagram, and (d) an H-plane cross polarization direction diagram;
FIG. 5 is a block diagram of a digital phase shifter with 4-bit (168.75 degree) phase quantization;
FIG. 6 is a plot of transmission amplitude and transmission phase for a digital phase shifter with 4-bit (168.75 degree) phase quantization operating at different capacitance values within the operating frequency band;
fig. 7 is an exploded view of the 5-bit programmable phased array antenna in embodiment 1;
FIG. 8 is a plot of amplitude and phase for a 1:24 feed network based on a coplanar waveguide and ground (CPWG) architecture in the operating band; wherein, (a) is an amplitude value curve; (b) is a phase curve;
fig. 9 is a phase encoding diagram corresponding to each array element of the 5-bit programmable phased array antenna beam in different scanning angles in embodiment 1;
FIG. 10 is a graph showing the results of the reflection coefficient of the 5-bit programmable phased array antenna in example 1 under a beam sweep of 0 to 60 degrees;
fig. 11 is a beam pattern scanned at different frequency points by 0 ° -60 ° for the 5-bit programmable phased array antenna in example 1, wherein (a) the diagram is a low frequency point (14.4 GHz); (b) the figure shows the central frequency point (14.8GHz), and the (c) figure shows the high frequency point (15.4 GHz);
fig. 12 is a graph of the scanning performance results of the 5-bit programmable phased array antenna in example 1 at different frequency points and at different scanning angles, wherein (a) is a gain curve graph; (b) the figure is a side lobe level graph; (c) the figure is a cross-polarization ratio plot.
The figure shows that: the antenna comprises an upper metal layer 1, an upper dielectric substrate 2, a middle metal layer 3, an adhesive layer 4, a lower dielectric substrate 5, a lower metal layer 6, a radiation patch 7, an optional feed structure 8, a bias circuit 9, two rectangular slots 10, a 3-dB impedance conversion branch line coupler 11, two reflective loads 12 and a second bias circuit 13.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-11, the present embodiment provides a low-cost, high-performance 5-bit programmable phased array antenna operating in the Ku band. The array antenna includes: a reconfigurable radiating element with 1-bit (180 degree) phase quantization, a digital phase shifter with 4-bit (168.75 degree) phase quantization and a feed network,
the 5-bit programmable phased array antenna working in the Ku waveband and having low cost and high performance comprises two layers of dielectric substrates and three layers of metal structures; the upper metal layer is a radiation structure of the 5-bit programmable phased array antenna, the lower metal layer is a feed structure of the 5-bit programmable phased array antenna, and the middle metal layer is a metal ground to prevent electromagnetic waves from leaking to the back of the antenna; the two dielectric substrates are connected through an adhesive layer and are realized through a multilayer PCB laminating technology. The dielectric substrate has a dielectric constant of epsilon r Rogers 4003C with a loss tangent σ of 0.0027 and 3.55, wherein the upper dielectric substrate has a thickness of 1.524mm and the lower dielectric substrate has a lower dielectric layerThe thickness of the substrate is 0.203 mm; the adhesive layer has a dielectric constant of ∈ r Rockwell 4450F with a loss tangent σ of 0.0027, 3.7, and a thickness of 0.1 mm; the metal material is copper, and the thickness of the metal material is 0.018 mm.
Specifically, in the present embodiment, the radiation unit is constituted by 24 × 2 reconfigurable radiation units having 1-bit (180-degree) phase quantization. The reconfigurable radiating element forms a phase difference with 180 degrees stability by utilizing the symmetry of the antenna structure and mainly comprises a radiating patch, a selectable feed structure and a bias circuit. The radiation patch is different from a traditional rectangular patch, two rectangular grooves are distributed in the direction of an electric field, and compared with the traditional rectangular patch serving as the radiation patch, the grooved radiation patch has wider impedance bandwidth and lower cross polarization. The selectable feed structure is in a 'Y' -shaped structure, two PIN diodes with the models of MADP-14020 and 907 are symmetrically arranged at the tail end of the selectable feed structure, and the current path of the electromagnetic wave on the selectable feed structure can be selected by adjusting the switching states of the two diodes. The bias circuit is used for isolating alternating current signals and isolating direct current signals respectively, the bias circuit for isolating the alternating current signals is composed of a bias line and a 0.5pF grounding capacitor, and the isolating direct current signals are composed of a 0.5pF capacitor connected in series to a signal input end.
Specifically, in this embodiment, the digital phase shifter with 4-bit (168.75 degree) phase quantization consists of a 3-dB impedance transforming branch coupler, two reflective loads and a bias circuit. The branch line coupler uses a bent microstrip line to replace a quarter-wavelength transmission line, so that the area of the branch line coupler is reduced by 33%; the two reflective loads are connected to the terminals of the branch line coupler and are composed of two varactors (MAVR-011020-. Varactors require an external dc bias voltage to change the capacitance value to produce a phase shift. The DC bias line consists of a 100pF grounding capacitor and a section of high-impedance line with a quarter wavelength and has the function of isolating AC signals. Two 100pF capacitors are connected in series at the input and output ends of the phase shifter to play a role in isolating direct current signals.
Specifically, in this embodiment, a 1:24 feed network based on a coplanar waveguide and ground (CPWG) structure is designed to feed the radiating elements, and its power division ratio adopts a taylor distribution.
Specifically, in the 5-bit programmable phased array antenna working in the Ku band and having low cost and high performance described in this embodiment, states of a loaded PIN diode and a loaded varactor diode are adjusted by an external voltage division circuit to generate corresponding phase codes, so that beam scanning at any angle of 0-60 degrees is realized. Wherein, at the central frequency point (14.8GHz) of radiation, the scanning error of the phased array antenna under all scanning angles is less than 1 degree, the gain roll-off is less than 2.4dB, the side lobe level is less than-1 dB, and the cross polarization ratio is less than-26 dB.
In order to verify the correctness and the advancement of the scheme provided by the embodiment, simulation and test are performed, which specifically comprises the following steps:
fig. 1 is a structural diagram of a reconfigurable radiation unit with 1-bit (180 degree) phase quantization, wherein, (a) the radiation unit is in an exploded structural view; (b) an upper structure diagram of the radiation unit; (c) radiation unit lower layer structure chart. The specific dimensions are shown in table 1. To verify cell performance, this example was simulated in a commercial CST. Referring to FIG. 3, which is a graph of the unit reflection coefficient simulation results, it can be seen that the operating bandwidth (S11| < -10dB) of the unit is 13.7GHz to 15.7 GHz. Referring to fig. 3, a graph of the electric field far field phase and the phase difference of the 1-bit reconfigurable radiation unit operating in the '0' state and the '1' state shows that the unit can generate a stable 180-degree phase difference when operating in the two states respectively. Referring to fig. 4, the 1-bit reconfigurable radiation unit works in central frequency point (14.8GHz) E-plane, H-plane main polarization and cross polarization directional diagrams.
Referring to fig. 5, a block diagram of a digital phase shifter with 4-bit (168.75 degree) phase quantization is shown. The specific dimensions are shown in table 2. Referring to fig. 6, the transmission amplitude and transmission phase curves of the structure diagram of the 4-bit digital phase shifter at different capacitance values in the operating band, it can be seen that when the capacitance is changed from 0.048 to 0.144pF, the relative phase shift can be stabilized at 4-bit (168.75 °) in the desired frequency band centered at 14.8GHz, and the insertion loss in all states is lower than-3 dB.
Referring to fig. 7, which is a structural diagram of a low-cost high-performance 5-bit programmable phased array antenna operating in Ku band, it can be seen that the phased array antenna is composed of 24 × 2 1-bit reconfigurable radiating units, 24 4-bit digital phase shifters, and 1:24 feed network based on a coplanar waveguide and ground (CPWG) structure.
See fig. 8 for the magnitude and phase curves over the operating band for a 1:24 feed network based on a coplanar waveguide and ground (CPWG) architecture, using taylor amplitude clipping. Fig. 8 compares the feed network operating at 14.4GHz, 14.8GHz, and 15.4GHz design targets with the actual simulated amplitude and phase curves, and it can be seen that the designed feed network matches the targets well.
Fig. 10 is a graph showing the reflection coefficient results of the 5-bit programmable phased array antenna in embodiment 1 under the beam scanning of 0 to 60 degrees, and the phase code patterns corresponding to the array elements under different scanning angles are shown in fig. 9. It can be seen that the-10 dB impedance matching band is 14.4 to 15.4GHz and the reflection coefficients at different scan angles are substantially the same. The scanned beam patterns on the H-plane at 14.4GHz, 14.8GHz, and 15.4GHz are shown in fig. 11(a), (b), and (c), respectively. It can be seen that the 5-bit programmable phased array antenna can realize high-precision scanning in a working frequency band.
Fig. 11 is a graph showing the scanning performance results of the 5-bit programmable phased array antenna in example 1 at different frequency points and at different scanning angles. Fig. (a) is a gain graph, and it can be seen that the maximum gain of the proposed phased array antenna at three frequency points in the 0 ° direction is 15.4dBi, and 15.6dBi, 15.4dBi and their corresponding gain roll-off are 2.9dB, 2.4dB, 2.8dB, respectively. Graph (b) is a side lobe level plot, and it can be seen that the side lobe level of the radiation beam at the central frequency point of 14.8GHz for the proposed phased array antenna is less than-16 dB at all angles and less than-15 dB at both low and high frequencies. Fig. (c) is a cross-polarization ratio plot, and it can be seen that the proposed phased array antenna has a ratio of main polarization cross-polarization of the radiation beam at the central frequency point of 14.8GHz of less than-30 dB at all angles and less than-25 dB at both low and high frequencies. The results further show the performances of the 5-bit programmable phased array antenna, such as high scanning precision, low side lobe and low cross polarization.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A low-cost high-performance 5-bit programmable phased array antenna working in a Ku wave band is characterized in that the phased array antenna consists of three parts, including a reconfigurable radiation unit (a), a digital phase shifter (b) with 4-bit 168.75-degree phase quantization and a feed network (c); they are respectively positioned on the upper part, the middle part and the lower part of the antenna to form a laminated structure; the phased-array antenna comprises two dielectric substrates and three metal layer structures, namely an upper metal layer (1), an upper dielectric substrate (2), a middle metal layer (3), an adhesive layer (4), a lower dielectric substrate (5) and a lower metal layer (6) from top to bottom in sequence; the upper metal layer is a radiation structure of the 5-bit programmable phased array antenna, the middle metal layer is a metal ground to prevent electromagnetic waves from leaking to the back of the antenna, and the lower metal layer is a feed structure of the 5-bit programmable phased array antenna; the two dielectric substrates are connected with the three metal layers through the bonding layers.
2. The low-cost high-performance 5-bit programmable phased array antenna operating in the Ku band as claimed in claim 1, wherein the upper dielectric substrate (2) has a thickness of 1.524mm and a dielectric constant of ∈ r 3.55, and a loss tangent σ of 0.0027.
3. The low-cost high-performance 5-bit programmable phased array antenna operating in the Ku band as claimed in claim 1, wherein said lower dielectric substrate (5) is rogers 4003C and has a thickness of 0.203 mm; the dielectric constant of the adhesive layer is epsilon r Rocky 4450F with a loss tangent σ of 0.0027, with a thickness of 0.1 mm.
4. The low-cost high-performance 5-bit programmable phased array antenna working in a Ku waveband according to claim 1, wherein the reconfigurable radiation units (a) are 24 x 2 reconfigurable radiation units with 1-bit 180-degree phase quantization.
5. The low-cost high-performance 5-bit programmable phased array antenna operating in Ku band as claimed in claim 4, characterized in that said reconfigurable radiating element (a) comprises three parts of radiating patch (a1), selectable feed structure (a2) and bias circuit (a3), and 180 degrees stable phase difference is formed by using symmetry of antenna structure; two rectangular slots (a1.1) are distributed on the radiation patch (a1) in the direction of an electric field, and the slotted radiation patch has wider impedance bandwidth and lower cross polarization; the selectable feed structure (a2) is in a Y-shaped structure, the tail end of the selectable feed structure is symmetrically provided with a first PIN diode (P1) and a second PIN diode (P2) with the models of MADP-14020 and 907, and the current path of the electromagnetic wave on the selectable feed structure is selected by adjusting the switching states of the two PIN diodes; the bias circuit (a3) is used for isolating alternating current signals and isolating direct current signals respectively, the bias circuit for isolating the alternating current signals is composed of a first bias line (L1), a second bias line (L2), a first grounding capacitor (C1) and a second grounding capacitor (C2), and the circuit for isolating the direct current signals is composed of a third capacitor (C3) connected in series to a signal input end.
6. The low cost high performance 5-bit programmable phased array antenna operating in Ku band as claimed in claim 1, wherein said 4-bit 168.75 degree phase quantized digital phase shifter (b) comprises a 3-dB impedance transforming branch coupler (b1), two reflective loads (b2) and a dc bias line (b 3); the branch line coupler (b1) uses a curved microstrip line, so that the area of the branch line coupler is reduced; two reflecting loads (B2) are connected at the terminal of the branch line coupler (B1) and are composed of two variable capacitance diodes, namely a first variable capacitance diode (B1), a first variable capacitance diode (B2) and a two-end transmission line; the varactor diode needs an external direct current bias voltage to change a capacitance value so as to generate phase shift; the direct current bias line (b3) is formed by connecting a grounding capacitor (C4) with a section of high-impedance line with a quarter wavelength, has the function of isolating alternating current signals, and two direct current blocking capacitors, namely a first direct current blocking capacitor (C5) and a second direct current blocking capacitor (C6) are connected in series at the input end and the output end of the 4-bit 168.75-degree phase quantization digital phase shifter (b) to play the role of isolating direct current signals.
7. The low-cost high-performance 5-bit programmable phased array antenna working in a Ku waveband according to claim 1, wherein the feed network (c) is a 1:24 feed structure based on a coplanar waveguide structure, and the power division ratio of the feed network adopts taylor distribution.
8. The low-cost high-performance 5-bit programmable phased array antenna working in a Ku waveband according to claim 5 or 6, wherein the states of the PIN diode and the varactor diode are changed through an external voltage division circuit to generate corresponding codes, so that beam scanning of 0-60 degrees is realized; wherein, at the radiated central frequency point of 14.8GHz, the scanning error of the phased array antenna under all scanning angles is less than 1 degree, the gain roll-off is less than 2.4dB, the side lobe level is less than-1 dB, and the cross polarization ratio is less than-26 dB.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579649A (en) * | 2022-12-07 | 2023-01-06 | 东南大学 | Two-dimensional wide-angle scanning programmable bit array antenna with low cost and low profile |
| CN116231301A (en) * | 2023-05-04 | 2023-06-06 | 湖南大学 | Double-feed programmable unit and reflected radiation single-dual-beam scanning array antenna |
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2022
- 2022-06-29 CN CN202210776371.3A patent/CN115064875A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579649A (en) * | 2022-12-07 | 2023-01-06 | 东南大学 | Two-dimensional wide-angle scanning programmable bit array antenna with low cost and low profile |
| CN116231301A (en) * | 2023-05-04 | 2023-06-06 | 湖南大学 | Double-feed programmable unit and reflected radiation single-dual-beam scanning array antenna |
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