CN112615154B - Ultra-wideband feed network with switchable functions - Google Patents
Ultra-wideband feed network with switchable functions Download PDFInfo
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- CN112615154B CN112615154B CN202011409717.3A CN202011409717A CN112615154B CN 112615154 B CN112615154 B CN 112615154B CN 202011409717 A CN202011409717 A CN 202011409717A CN 112615154 B CN112615154 B CN 112615154B
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- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
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- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses a function-switchable ultra-wideband feed network, which comprises a first double-section ultra-wideband Wilkinson power divider, a second double-section ultra-wideband Wilkinson power divider, a third double-section ultra-wideband Wilkinson power divider, a multi-mode resonator, a reference phase-shifting line unit, a first open-circuit Lange coupler, a second open-circuit Lange coupler, a first short-circuit Lange coupler, a second short-circuit Lange coupler, a first single-pole double-throw switch S1 and a second single-pole double-throw switch S2. The invention relates to the field of antenna communication, and a circuit structure capable of flexibly switching a dual-polarization feed network or a circular polarization feed network is formed by reasonably configuring each double-section ultra-wideband Wilkinson power divider, an open-circuit and short-circuit Lange coupler, a multi-mode resonator and a reference phase-shift line unit, so that the occupied area of the antenna feed network is reduced, the multiple functions of an antenna are realized, and the manufacturing cost is reduced.
Description
Technical Field
The invention relates to the field of antenna communication, in particular to a function switchable ultra-wideband feed network.
Background
With the development of communication technology, the capacity of a communication system is improved, the information transmission speed is faster and faster, and the traditional linear polarization antenna is difficult to meet the requirements. Therefore, the broadband and miniaturization of the antenna are important development directions of future antennas, and have extremely high application values and research significance. In order to make the antenna develop towards a broadband and miniaturization direction, the polarization mode of the antenna is usually designed into a multi-polarization mode such as dual polarization and circular polarization. Meanwhile, antennas with different polarizations are also used in different scenarios, for example, dual-polarized antennas are often used in mobile communications, and circularly polarized antennas are often used in satellite communications.
At present, methods for realizing multi-polarization of an antenna are mostly reconfigurable antennas designed by dynamically changing a radiating element, and few methods are used for dynamically changing a feed circuit of a feed circuit. If different polarization modes are desired without changing the antenna structure, polarization switching can be generally achieved by designing a plurality of different feed circuits, but designing a plurality of different feed circuits on the substrate not only increases the area and manufacturing cost of the antenna substrate, but also affects the installation of the antenna.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the ultra-wideband feed network with switchable functions, and the circuit structure capable of flexibly switching the dual-polarization feed or circular polarization feed network is formed by reasonably configuring each double-section ultra-wideband Wilkinson power divider, the open-circuit and short-circuit Lange couplers, the multi-mode resonators and the reference phase shift line units, so that the occupied area of the antenna feed network is reduced, the multifunction of the antenna is realized, and the manufacturing cost is reduced.
The invention relates to a function-switchable ultra-wideband feed network, which comprises a first double-section ultra-wideband Wilkinson power divider, a second double-section ultra-wideband Wilkinson power divider, a third double-section ultra-wideband Wilkinson power divider, a multi-mode resonator, a reference phase-shifting line unit, a first open-circuit Lange coupler, a second open-circuit Lange coupler, a first short-circuit Lange coupler, a second short-circuit Lange coupler, a first single-pole double-throw switch S1 and a second single-pole double-throw switch S2; the phase difference between the signal output by the multimode resonator and the signal output by the reference phase shifting line unit is 90 degrees, but the amplitudes are the same; the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are simultaneously controlled by a single signal; when the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the second movable end a2 of the first single-pole double-throw switch and the second movable end b2 of the second single-pole double-throw switch, the ultra-wideband feed network with switchable functions works in a two-way differential circuit state, the signal amplitude between the first feed end Q1 and the second feed end Q2 is equal and the phase difference is 180 degrees, and the signal amplitude between the third feed end Q3 and the fourth feed end Q4 is equal and the phase difference is 180 degrees; at the moment, the first feeding end Q1 and the second feeding end Q2 are in a mutually independent and isolated state with the third feeding end Q3 and the fourth feeding end Q4; when the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the first moving end a1 of the first single-pole double-throw switch and the first moving end b1 of the second single-pole double-throw switch, the ultra-wideband feed network with switchable functions is in a full-quadrature state of four output ports, the amplitudes of signals on the first feed end Q1, the second feed end Q2, the third feed end Q3 and the fourth feed end Q4 are equal, and a phase difference of 90 degrees sequentially exists between two adjacent ports.
Further, the first dual ultra-wideband wilkinson power divider, the second dual ultra-wideband wilkinson power divider and the third dual ultra-wideband wilkinson power divider all divide a signal received at an input end into two signals at an output end, and the power of the two signals becomes 1/2 of the input signal.
Furthermore, the signals generated by the output ends of the first open-circuit Lange coupler and the first short-circuit Lange coupler have a phase difference of 180 degrees; the signals generated at the output terminals of the second short-circuit Lange coupler and the second open-circuit Lange coupler are also 180 degrees out of phase.
Further, the multimode resonator is connected with the first movable end a1 of the first single-pole double-throw switch S1 through a transmission line; the reference phase shift line unit is also connected with the first movable end b1 of the second single-pole double-throw switch S2 through a transmission line; the transmission lines are all 50 ohm transmission lines.
Compared with the prior art, the invention has the following advantages:
the circuit structure capable of flexibly switching the dual-polarization feed network or the circular polarization feed network is formed by reasonably configuring each double-section ultra-wideband Wilkinson power divider, the open-circuit and short-circuit Lange couplers, the multi-mode resonators and the reference phase shift line units, so that the occupied area of the antenna feed network is reduced, the multifunction of the antenna is realized, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a two-way balun S parameter graph of the present invention;
FIG. 3 is a graph of the phase relationship between Q1 and Q2, respectively, and I1;
FIG. 4 is a plot of the phase difference between Q1 and Q2;
FIG. 5 is a graph of the phase relationship between Q3 and Q4, respectively, and I2;
FIG. 6 is a plot of the phase difference between Q3 and Q4;
FIG. 7 is a graph of transmission coefficients for I3 and Q1, Q2, Q3, Q4;
FIG. 8 is a graph of reflection coefficients for I3 and Q1, Q2, Q3, Q4;
FIG. 9 is a graph of the phase relationship between Q1, Q2, Q3, and Q4, respectively, and I3;
fig. 10 is a graph of the degree of isolation between Q1, Q2, Q3, Q4.
Wherein:
a-signal A, B-signal B, C-signal C, D-signal D, E-signal E, F-signal F, G-signal G, H-signal H;
i1-first input end, I2-second input end, I3-third input end, Q1-first feed end, Q2-second feed end, Q3-third feed end, Q4-fourth feed end;
s1-a first single-pole double-throw switch, a 1-a first movable end of the first single-pole double-throw switch, a 2-a second movable end of the first single-pole double-throw switch, and a 3-a stationary end of the first single-pole double-throw switch;
s2-second single-pole double-throw switch, b 1-first moving end of second single-pole double-throw switch, b 2-second moving end of second single-pole double-throw switch, b 3-immobile end of second single-pole double-throw switch.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1, the present invention provides a function-switchable ultra-wideband feed network, which includes a first dual-node ultra-wideband wilkinson power divider, a second dual-node ultra-wideband wilkinson power divider, a third dual-node ultra-wideband wilkinson power divider, a multi-mode resonator, a reference phase shift line unit, a first open-circuit Lange coupler, a second open-circuit Lange coupler, a first short-circuit Lange coupler, a second short-circuit Lange coupler, a first single-pole double-throw switch S1, and a second single-pole double-throw switch S2. The circuit structure capable of flexibly switching the dual-polarization feed network or the circular polarization feed network is formed by reasonably configuring each double-section ultra-wideband Wilkinson power divider, the open-circuit and short-circuit Lange couplers, the multi-mode resonators and the reference phase shift line units, so that the occupied area of the antenna feed network is reduced, the multifunction of the antenna is realized, and the manufacturing cost is reduced.
The input end of the third double-section ultra-wideband Wilkinson power divider is connected with a third input end I3; the first output end of the third double-section ultra-wideband Wilkinson power divider, the multimode resonator, the first movable end a1 and the fixed end a3 of the first single-pole double-throw switch S1 are sequentially connected with the input end of the first double-section ultra-wideband Wilkinson power divider. The second moving end a2 of the first single-pole double-throw switch is connected with the first input end I1; two output ends of the first double-node ultra-wideband Wilkinson power divider are respectively connected with a first feed end Q1 through a first open-circuit Lange coupler and connected with a second feed end Q2 through a first short-circuit Lange coupler. The second output end of the third double-node ultra-wideband Wilkinson power divider, the reference phase shift line unit, the first movable end b1 and the fixed end b3 of the second single-pole double-throw switch S2 and the input end of the second double-node ultra-wideband Wilkinson power divider are connected in sequence. The second moving end b2 of the second single-pole double-throw switch is connected with the second input end I2; two output ends of the second dual-node ultra-wideband Wilkinson power divider are respectively connected with a third feed end Q3 through a second short-circuit Lange coupler and a fourth feed end Q4 through a second open-circuit Lange coupler.
In the whole ultra-wideband feed network, the first, second and third double-node ultra-wideband Wilkinson power dividers divide a signal received by an input end into two signals at an output end, and the power of the two signals is changed into 1/2 of an input signal, so that the power of signals output by subsequent ports is kept basically equal.
The multimode resonator is connected with the first movable end a1 of the first single-pole double-throw switch S1 through a transmission line; the reference phase shift line unit is also connected to the first moving terminal b1 of the second single pole double throw switch S2 through a transmission line. All transmission lines used are 50 ohm transmission lines, so that not only is the loss low, but also the use is more convenient. The first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are both in JSW2-63DR + models and have the characteristics of excellent performance and low price.
The following is the switching principle of two feeding modes of dual polarization and circular polarization:
when a dual-polarization feeding mode is required, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the second movable end a2 of the first single-pole double-throw switch and the second movable end b2 of the second single-pole double-throw switch, and input signals of the whole feeding network are input from the first input end I1 and the second input end I2. Then the signals are divided into four signals of a signal E, a signal F, a signal G and a signal H through a first double-node ultra-wideband Wilkinson power divider and a second double-node ultra-wideband Wilkinson power divider respectively, and the power of the four signals is 1/2 of the input signal.
Of the four output signals, the signal E generates an output signal with a phase of 0 degree at the first feed end Q1 through the first open-circuit Lange coupler, and the signal F generates an output signal with a phase of 180 degrees at the second feed end Q2 through the first short-circuit Lange coupler, so that the signals generated at the output ends of the first open-circuit Lange coupler and the first short-circuit Lange coupler have a phase difference of 180 degrees. The phase relationship simulation results of the signals output by the first feeding end Q1 and the second feeding end Q2 are respectively shown in fig. 3 and fig. 4, and it can be seen from the figure that when the signals are input from the first input end I1, the phase difference of the signals output by the first feeding end Q1 and the second feeding end Q2 is 180 degrees, and the matching degree of the simulation and the theoretical value is good.
Similarly, the signal G generates an output signal with a phase of 180 degrees at the third feeding terminal Q3 through the second short-circuit Lange coupler, and the signal H generates an output signal with a phase of 0 degrees at the fourth feeding terminal Q4 through the second open-circuit Lange coupler, so that the signals generated at the output terminals of the second short-circuit Lange coupler and the second open-circuit Lange coupler have a phase difference of 180 degrees. The phase relationship simulation results of the signals output by the third feeding end Q3 and the fourth feeding end Q4 are shown in fig. 5 and 6, which indicate that when the signal is input from the second input end I2, the phase difference between the signals output by the third feeding end Q3 and the fourth feeding end Q4 is 180 degrees. The phase of the output signal of the first feed end Q1 is 0 degree, the phase of the output signal of the fourth feed end Q4 is 0 degree, the phase of the output signal of the second feed end Q2 is 180 degrees, and the phase of the output signal of the third feed end Q3 is 180 degrees, so that a dual-polarization phase-shifting feed network is formed, and dual-polarization ultra-wideband feed is realized. The two-way balun S parameter curve of the simulation result is shown in FIG. 2, and it can be seen from the graph that the relative bandwidth of the feed network from 2GHz to 6GHz is close to 100%.
When a circular polarization feeding mode is required, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the first movable end a1 of the first single-pole double-throw switch and the first movable end b1 of the second single-pole double-throw switch, and an input signal of the whole feeding network is input from the third input end I3. Then the signal is divided into two signals of a signal A and a signal B through a third double-node ultra-wideband Wilkinson power divider, and the power of the two signals becomes 1/2 of the input signal. The signals A and B generate a signal C and a signal D with a phase difference of 90 degrees through the cooperation of the multimode resonator and the reference phase shift line unit, the signal C maintains the original phase (namely 0 degree) of the input signal, the signal D is shifted by 90 degrees (namely 0+90 degrees) on the basis of the phase of the input signal, and the amplitudes of the signal C and the signal D are the same. The signal C and the signal D are divided into four signals, namely a signal E, a signal F, a signal G and a signal H through the first double-node ultra-wideband Wilkinson power divider and the second double-node ultra-wideband Wilkinson power divider, and the power of the four signals is changed into 1/4 of the input signal of the third input end I3.
The signal E generates an output signal with a phase of 0 degrees at the first feed end Q1 through the first open-circuit Lange coupler, and the signal F generates an output signal with a phase of 180 degrees at the second feed end Q2 through the first short-circuit Lange coupler, so that the signals generated at the output ends of the first open-circuit Lange coupler and the first short-circuit Lange coupler have a phase difference of 180 degrees. Similarly, the signal G generates an output signal with a phase of 270 degrees at the third feeding terminal Q3 through the second short-circuit Lange coupler, and the signal H generates an output signal with a phase of 90 degrees at the fourth feeding terminal Q4 through the second open-circuit Lange coupler, which realizes that the signals generated at the output terminals of the second short-circuit Lange coupler and the second open-circuit Lange coupler have a phase difference of 180 degrees. The phase of the signal of the first feed end Q1 is 0 degree, the phase of the signal of the fourth feed end Q4 is 90 degrees, the phase of the signal of the second feed end Q2 is 180 degrees, and the phase of the signal of the third feed end Q3 is 270 degrees, so that a circularly polarized phase shift feed network is formed, and circularly polarized ultra-wideband feed is realized.
The simulation results of the ultra-wideband feed network with switchable functions in the circular polarization feed mode are shown in fig. 7 to 10. The transmission coefficient curves of I3 and Q1, Q2, Q3, Q4 are shown in fig. 7, and the reflection coefficient simulation results of each port are shown in fig. 8. As can be seen from the figure, the signal power of the feeding network from the third input terminal I3 to the first feeding terminal Q1, the second feeding terminal Q2, the third feeding terminal Q3 and the fourth feeding terminal Q4 is substantially equal, and the relative bandwidth from 2.5GHz to 6GHz is close to 100%. The simulation result of the phase relationship between the first feeding end Q1, the second feeding end Q2, the third feeding end Q3 and the fourth feeding end Q4 and the third input end I3 is shown in fig. 9, and it can be seen from the figure that the output ports from 2.5GHz to 6GHz exhibit phase orthogonality characteristics and are sequentially 90-degree phase differences from each other. The simulation result of the isolation curves among the first feeding end Q1, the second feeding end Q2, the third feeding end Q3 and the fourth feeding end Q4 is shown in fig. 10, and it can be seen from the graph that the isolation between any two output ports from 2.5GHz to 6GHz is greater than 15dB, and good isolation is achieved between the output ports.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (4)
1. A function-switchable ultra-wideband feed network is characterized by comprising a first double-section ultra-wideband Wilkinson power divider, a second double-section ultra-wideband Wilkinson power divider, a third double-section ultra-wideband Wilkinson power divider, a multi-mode resonator, a reference phase-shifting line unit, a first open-circuit Lange coupler, a second open-circuit Lange coupler, a first short-circuit Lange coupler, a second short-circuit Lange coupler, a first single-pole double-throw switch S1 and a second single-pole double-throw switch S2; the phase difference between the signal output by the multimode resonator and the signal output by the reference phase shifting line unit is 90 degrees, but the amplitudes are the same; the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are simultaneously controlled by a single signal; when the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the second movable end a2 of the first single-pole double-throw switch and the second movable end b2 of the second single-pole double-throw switch, the ultra-wideband feed network with switchable functions works in a two-way differential circuit state, the signal amplitude between the first feed end Q1 and the second feed end Q2 is equal and the phase difference is 180 degrees, and the signal amplitude between the third feed end Q3 and the fourth feed end Q4 is equal and the phase difference is 180 degrees; at the moment, the first feeding end Q1 and the second feeding end Q2 are in a mutually independent and isolated state with the third feeding end Q3 and the fourth feeding end Q4; when the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are respectively connected with the first movable end a1 of the first single-pole double-throw switch and the first movable end b1 of the second single-pole double-throw switch, the ultra-wideband feed network with switchable functions is in a full-orthogonal state of four output ports, the amplitudes of signals on the first feed end Q1, the second feed end Q2, the third feed end Q3 and the fourth feed end Q4 are equal, and a phase difference of 90 degrees sequentially exists between two adjacent ports;
the input end of the third double-section ultra-wideband Wilkinson power divider is connected with a third input end I3; the first output end of the third double-section ultra-wideband Wilkinson power divider, the multimode resonator, the first movable end a1 and the fixed end a3 of the first single-pole double-throw switch S1 are sequentially connected with the input end of the first double-section ultra-wideband Wilkinson power divider; the second moving end a2 of the first single-pole double-throw switch is connected with a first input end I1; two output ends of the first double-section ultra-wideband Wilkinson power divider are respectively connected with a first feed end Q1 through a first open-circuit Lange coupler and connected with a second feed end Q2 through a first short-circuit Lange coupler; the second output end of the third double-node ultra-wideband Wilkinson power divider, the reference phase shift line unit, the first movable end b1 and the fixed end b3 of the second single-pole double-throw switch S2 are sequentially connected with the input end of the second double-node ultra-wideband Wilkinson power divider; the second moving end b2 of the second single-pole double-throw switch is connected with a second input end I2; two output ends of the second dual-node ultra-wideband Wilkinson power divider are respectively connected with a third feed end Q3 through a second short-circuit Lange coupler and a fourth feed end Q4 through a second open-circuit Lange coupler.
2. The switchable ultra-wideband feed network of claim 1, wherein the first dual ultra-wideband Wilkinson power divider, the second dual ultra-wideband Wilkinson power divider and the third dual ultra-wideband Wilkinson power divider all divide a signal received at an input end into two signals at an output end, and the power of both signals becomes 1/2 of the input signal.
3. The switchable ultra-wideband feed network of claim 1 wherein the signals produced at the outputs of the first open-circuit Lange coupler and the first short-circuit Lange coupler are 180 degrees out of phase; the signals generated at the output terminals of the second short-circuit Lange coupler and the second open-circuit Lange coupler are also 180 degrees out of phase.
4. The switchable ultra-wideband feed network as claimed in claim 1, wherein the multimode resonator is connected to the first moving end a1 of the first single-pole double-throw switch S1 through a transmission line; the reference phase shift line unit is also connected with the first movable end b1 of the second single-pole double-throw switch S2 through a transmission line; the transmission lines are all 50 ohm transmission lines.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442371B1 (en) * | 1998-12-17 | 2002-08-27 | Lg Information & Communications, Ltd. | Polarization measuring apparatus in a mobile communication system |
| CN207743390U (en) * | 2018-01-29 | 2018-08-17 | 南京波平电子科技有限公司 | A kind of broadband electricity tune polarization changer |
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| US6931245B2 (en) * | 2002-08-09 | 2005-08-16 | Norsat International Inc. | Downconverter for the combined reception of linear and circular polarization signals from collocated satellites |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442371B1 (en) * | 1998-12-17 | 2002-08-27 | Lg Information & Communications, Ltd. | Polarization measuring apparatus in a mobile communication system |
| CN207743390U (en) * | 2018-01-29 | 2018-08-17 | 南京波平电子科技有限公司 | A kind of broadband electricity tune polarization changer |
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