CN113922014A - Reconfigurable filtering phase shifter - Google Patents
Reconfigurable filtering phase shifter Download PDFInfo
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- CN113922014A CN113922014A CN202111193186.3A CN202111193186A CN113922014A CN 113922014 A CN113922014 A CN 113922014A CN 202111193186 A CN202111193186 A CN 202111193186A CN 113922014 A CN113922014 A CN 113922014A
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- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
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Abstract
The invention discloses a reconfigurable filtering phase shifter which comprises a pair of Wilkinson power dividers and a reconfigurable filtering branch line bridge, wherein the Wilkinson power dividers are respectively connected with an input port and an output port, and the reconfigurable filtering branch line bridge is loaded between the two Wilkinson power dividers and can adjust the output power ratio. The input end and the isolation end of the reconfigurable filtering branch line bridge generate a pair of identical output signals at two output ports under the excitation of the output signals of the Wilkinson power divider, the phase of the output signals is controlled according to the output power dividing ratio of the branch line bridge, the output signals are input from the output ports of the Wilkinson power divider, the superposition form of two paths of output signals is obtained, and the phase shifting process of the input signals of the reconfigurable filtering phase shifter is completed. The invention avoids the energy loss additionally generated by the traditional vector synthesis phase shifter scheme, obviously enhances the flexibility of the system, realizes the continuous adjustment and the filtering response of the working frequency of the phase shifter and greatly improves the functional integration level of a single circuit.
Description
Technical Field
The invention relates to the technical field of wireless communication systems, in particular to a reconfigurable filtering phase shifter.
Background
The phase shifter is a core device of the phased array system. The phased array adjusts the beam scanning angle by controlling the phase shifter to control the phase difference between each array element. The phase shift step of the phase shifter directly determines the scanning step of the beam. Therefore, in order to realize continuous beam scanning, researchers at home and abroad have conducted a lot of research on phase continuous adjustable phase shifters (abbreviated as adjustable phase shifters). The realization mode of the adjustable phase shifter mainly comprises a reflection type phase shifter, an adjustable phase shifter based on a lumped adjustable transmission line and a vector synthesis phase shifter. In addition to high phase resolution, a wide tuning range is another important requirement of modern phased array systems. Therefore, a tunable phase shifter based on vector synthesis technology is a common selection scheme. In order to meet the requirements of modern communication systems on miniaturization, multimode, multifrequency and multifunctional integration, the reconfigurable filtering phase shifter integrating the filtering function is an effective solution. The research on the filter phase shifter is mostly limited to the filter phase shifter with fixed frequency and fixed phase shift, and the independent control of frequency and phase is a research difficulty faced at present.
At present, no effective design method for a phase shift circuit integrating a reconfigurable filtering function exists. The inherent power loss of 3dB of the synthesized signal is inevitable because the signal before being input into the power synthesizer has a phase difference of 90 degrees.
Disclosure of Invention
In order to reduce the inherent loss of the phase shifter and realize the filtering response with reconfigurable frequency, the invention adopts a low-loss passive solution based on a vector synthesis technology, discloses a reconfigurable filtering phase shifter and realizes the integration of the filtering response and the continuous controllability of a single phase shift circuit on the frequency and the phase.
The invention realizes a filtering phase shifter with continuously adjustable center frequency and output signal phase. The invention discloses a reconfigurable filtering phase shifter which comprises a pair of Wilkinson power dividers and a reconfigurable filtering branch line bridge, wherein the Wilkinson power dividers are respectively connected with an input port and an output port, and the reconfigurable filtering branch line bridge is loaded between the two Wilkinson power dividers and can adjust the output power ratio. The input end and the isolation end of the reconfigurable filtering branch line bridge generate a pair of identical output signals at two output ports of the reconfigurable filtering branch line bridge under the excitation of the output signals of the Wilkinson power divider connected with the input port of the reconfigurable filtering phase shifter, the phase of the output signals is controlled according to the output power divider of the branch line bridge, the output signals generated at the two output ports of the reconfigurable filtering branch line bridge are input by the output ports of the Wilkinson power divider, the superposition form of the two output signals is obtained at the input port of the Wilkinson power divider, and the phase shifting process of the input signals of the reconfigurable filtering phase shifter is completed.
The reconfigurable filtering branch line bridge is composed of four half-wavelength stepped impedance resonators R1, R2, R3 and R4, wherein R1 and R4 are respectively connected with two output ports of a Wilkinson power divider close to an input end of the reconfigurable filtering phase shifter, R2 and R3 are respectively connected with two output ports of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter, R1 is respectively connected with R2 and R4, R3 is also respectively connected with R2 and R4, the two output ports of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter are used as two signal input ports in the reconfigurable filtering phase shifter, and the input port of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter is used as a signal output port of the reconfigurable filtering phase shifter.
Varactors Dr1, Dr2, Dr3 and Dr4 mounted at the low impedance end of each half-wavelength ladder impedance resonator are used as frequency tuning capacitors. The series-connected variable capacitance diodes Dm and Dn are arranged between the high-impedance ends of every two adjacent half-wavelength stepped impedance resonators and are used for controlling the interstage coupling of the two adjacent half-wavelength stepped impedance resonators. The variable capacitance diodes De1 and De2 are respectively installed at the input port and the output port of the reconfigurable filtering branch line bridge after being respectively connected with the fixed capacitor in series, and are used for adjusting the impedance matching of the input port and the output port of the reconfigurable filtering branch line bridge. By adjusting the capacitance values of the variable capacitance diodes Dm and Dn which are installed between the adjacent half-wavelength stepped impedance resonators and connected in series, when the capacitance values of the variable capacitance diodes Dm and Dn are changed from small to large until the capacitance values exceed a certain threshold value, the coupling property between the adjacent half-wavelength stepped impedance resonators is changed from inductive coupling to capacitive coupling.
The value of the coupling coefficient, k, required for the reconfigurable filter phase shifter to implement signal phase shiftingijDenotes half-wavelength ladder impedance resonators Ri andcoupling coefficient between half-wavelength ladder impedance resonators Rj, i 1,2,3,4, j 1,2,3,4, k0The method is characterized in that inter-stage coupling coefficients calculated by utilizing the Chebyshev filter theory according to the phase shift index requirement are expressed, and when the range of realizing signal phase adjustment of the reconfigurable filter phase shifter is [0, pi/2 ]]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi/2, pi)]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi, 3 pi/2)]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filter phase shifter for realizing the signal phase adjustment is (pi 3/2,2 pi),
and k represents the output power ratio of the reconfigurable filtering branch line bridge, and the positive coupling coefficient and the negative coupling coefficient respectively correspond to the half-wavelength stepped impedance resonators to form capacitive coupling and inductive coupling.
The invention has the beneficial effects that:
the invention adopts the circuit topology that the input end and the output end are connected with the power dividers, and the reconfigurable filtering branch line bridge is cascaded between the power dividers, realizes continuous output signal phase adjustment by controlling the output signal state of the filtering branch line bridge, avoids the energy loss additionally generated by the traditional vector synthesis phase shifter scheme, and obviously enhances the flexibility of the system. Furthermore, the topology is equally applicable to wideband circuit designs that do not require filtering functions. The invention utilizes the resonator with controllable electric length to realize the continuous adjustment of the working frequency of the phase shifter and the filter response, and greatly improves the functional integration of a single circuit.
Drawings
FIG. 1 is a diagram of the circuit topology of the present invention;
FIG. 2 is a circuit coupling topology of the present invention;
figure 3 is a block diagram of a reconfigurable filtered phase shifter circuit of the present invention.
Detailed Description
For a better understanding of the present disclosure, an example is given here.
The invention realizes a filtering phase shifter with continuously adjustable center frequency and output signal phase. The invention discloses a reconfigurable filtering phase shifter which comprises a pair of Wilkinson power dividers and a reconfigurable filtering branch line bridge, wherein the Wilkinson power dividers are respectively connected with an input port and an output port, and the reconfigurable filtering branch line bridge is loaded between the two Wilkinson power dividers and can adjust the output power ratio. The input end and the isolation end of the reconfigurable filtering branch line bridge generate a pair of identical output signals at two output ports of the reconfigurable filtering branch line bridge under the excitation of the output signals of the Wilkinson power divider connected with the input port of the reconfigurable filtering phase shifter, the phase of the output signals is controlled according to the output power divider of the branch line bridge, the output signals generated at the two output ports of the reconfigurable filtering branch line bridge are input by the output ports of the Wilkinson power divider, the superposition form of the two output signals is obtained at the input port of the Wilkinson power divider, and the phase shifting process of the input signals of the reconfigurable filtering phase shifter is completed.
The reconfigurable filtering branch line bridge is composed of four half-wavelength stepped impedance resonators R1, R2, R3 and R4, wherein R1 and R4 are respectively connected with two output ports of a Wilkinson power divider close to an input end of the reconfigurable filtering phase shifter, R2 and R3 are respectively connected with two output ports of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter, R1 is respectively connected with R2 and R4, R3 is also respectively connected with R2 and R4, the two output ports of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter are used as two signal input ports in the reconfigurable filtering phase shifter, and the input port of the Wilkinson power divider connected with the output port of the reconfigurable filtering phase shifter is used as a signal output port of the reconfigurable filtering phase shifter.
Varactors Dr1, Dr2, Dr3 and Dr4 mounted at the low impedance end of each half-wavelength ladder impedance resonator are used as frequency tuning capacitors. And the series-connected variable capacitance diodes Dm and Dn are loaded between the high-impedance ends of every two adjacent half-wavelength step impedance resonators and are used for controlling the interstage coupling of the two adjacent half-wavelength step impedance resonators. The variable capacitance diodes De1 and De2 are respectively installed at the input port and the output port of the reconfigurable filtering branch line bridge after being respectively connected with the fixed capacitor in series, and are used for adjusting the impedance matching of the input port and the output port of the reconfigurable filtering branch line bridge. By adjusting the capacitance values of the variable capacitance diodes Dm and Dn which are installed between the adjacent half-wavelength stepped impedance resonators and connected in series, when the capacitance values of the variable capacitance diodes Dm and Dn are changed from small to large until the capacitance values exceed a certain threshold value, the coupling property between the adjacent half-wavelength stepped impedance resonators is changed from inductive coupling to capacitive coupling.
The value of the coupling coefficient, k, required for the reconfigurable filter phase shifter to implement signal phase shiftingijThe coupling coefficient between the half-wavelength ladder impedance resonator Ri and the half-wavelength ladder impedance resonator Rj is expressed, i is 1,2,3,4, j is 1,2,3,4, k0The method is characterized in that inter-stage coupling coefficients calculated by utilizing the Chebyshev filter theory according to the phase shift index requirement are expressed, and when the range of realizing signal phase adjustment of the reconfigurable filter phase shifter is [0, pi/2 ]]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi/2, pi)]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi, 3 pi/2)]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filter phase shifter for realizing the signal phase adjustment is (pi 3/2,2 pi),
and k represents the output power ratio of the reconfigurable filtering branch line bridge, and the positive coupling coefficient and the negative coupling coefficient respectively correspond to the half-wavelength stepped impedance resonators to form capacitive coupling and inductive coupling.
FIG. 1 is a diagram of the circuit topology of the present invention; FIG. 2 is a circuit coupling topology of the present invention; figure 3 is a block diagram of a reconfigurable filtered phase shifter circuit of the present invention. In the figure, WPD is a wilkinson power divider, and RQC is a reconfigurable filtering branch line bridge. The reconfigurable Filtering component Coupler is an English overall name of the reconfigurable Filtering branch bridge.
In order to realize phase shift and simultaneously realize filter response and central frequency adjustment, the invention adopts the following technical scheme: a filtering phase shifter with continuously adjustable center frequency and output signal phase is shown in figure 2. The coupling coefficient kij with different signs illustrates that the coupling between the resonators in the proposed filter phase shifter needs to be switchable between inductive coupling and capacitance. Inductive coupling can be achieved by arranging adjacent resonators side by side while the short-circuited ends of the resonators are close, and conversion from inductive coupling to capacitive coupling can be achieved by loading additional adjusting capacitors between the adjacent resonators. Therefore, in order to realize the required coupling coefficient and filter response, fig. 3 shows a specific implementation structure based on a microstrip line resonator. The reconfigurable filtering phase shifter consists of a second-order broadband Wilkinson power divider connected with an input end and an output end and a reconfigurable filtering branch line bridge loaded in the middle. Therefore, the reconfigurable filtering phase shifter based on the coupling structure can realize the required interstage coupling coefficient, thereby realizing the continuous phase adjustment of 0-2 pi.
The invention is realized by adopting a microstrip line to load a commercial variable capacitance diode and 0402 to package and fix a capacitor, and the direct current bias voltage is 100K ohm through a resistor. The dielectric substrate is selected from Rogers 6010, and the thickness of the substrate is 50 mil.
Specifically, in the invention, the commercial varactor MA46H202 is selected as all diodes, the varactor De is adopted as an input end and is connected with a fixed capacitor with the capacitance value of 6pF in series, and the varactors Dm, Dn, Dr1, Dr2, Dr3 and Dr4 are connected back to back. The specific circuit size is l 1-22 mm, l 2-11.4 mm, l 3-14.4 mm, l 4-26.2 mm, l 5-6 mm, l 6-14 mm, w 1-2.3 mm, w 2-1 mm, w 3-0.8 mm, w 4-0.163 mm, and s 1-0.2 mm. According to the S parameter test result of the reconfigurable filtering phase shifter, the passband is adjusted to cover 1.05GHz to 1.3GHz, the change range of the insertion loss is 4.1dB to 2.1dB, and the reflection coefficient | S11| is better than 10 dB. The amplitude imbalance of the same frequency in different phase states is less than 1.4 dB. The adjustment range of the normalized phase difference Dj is 1.05GHz, the adjustment ranges of 1.16GHz and 1.3GHz are respectively 300 degrees, 320 degrees and 300 degrees, and a wider phase shift range (more than or equal to 300 degrees) is realized in the whole frequency adjustment range. The test result shows that the design concept of the invention is correct and feasible.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (4)
1. A reconfigurable filtering phase shifter is characterized by comprising a pair of Wilkinson power dividers and a reconfigurable filtering branch line bridge, wherein the Wilkinson power dividers are respectively connected with an input port and an output port, and the reconfigurable filtering branch line bridge is loaded between the two Wilkinson power dividers and has an adjustable output power ratio; the input end and the isolation end of the reconfigurable filtering branch line bridge generate a pair of identical output signals at two output ports of the reconfigurable filtering branch line bridge under the excitation of the output signals of the Wilkinson power divider connected with the input port of the reconfigurable filtering phase shifter, the phase of the output signals is controlled according to the output power divider of the branch line bridge, the output signals generated at the two output ports of the reconfigurable filtering branch line bridge are input by the output ports of the Wilkinson power divider, the superposition form of the two output signals is obtained at the input port of the Wilkinson power divider, and the phase shifting process of the input signals of the reconfigurable filtering phase shifter is completed.
2. A reconfigurable filter phase shifter according to claim 1, wherein the reconfigurable filter branch bridge is comprised of four half-wavelength ladder impedance resonators R1, R2, R3 and R4, wherein, R1 and R4 are respectively connected with two output ports of a Wilkinson power divider close to the input end of the reconfigurable filter phase shifter, R2 and R3 are respectively connected with two output ports of the Wilkinson power divider connected with the output port of the reconfigurable filter phase shifter, R1 is respectively connected with R2 and R4, R3 is also respectively connected with R2 and R4, for the two output ports of the wilkinson power divider connected to the output ports of the reconfigurable filter phase shifter, the reconfigurable filter phase shifter is used as two signal input ports, and the input port of the Wilkinson power divider connected with the output port of the reconfigurable filter phase shifter is used as the signal output port of the reconfigurable filter phase shifter.
3. The reconfigurable filtered phase shifter of claim 2,
the value of the coupling coefficient, k, required for the reconfigurable filter phase shifter to implement signal phase shiftingijThe coupling coefficient between the half-wavelength ladder impedance resonator Ri and the half-wavelength ladder impedance resonator Rj is expressed, i is 1,2,3,4, j is 1,2,3,4, k0The method is characterized in that inter-stage coupling coefficients calculated by utilizing the Chebyshev filter theory according to the phase shift index requirement are expressed, and when the range of realizing signal phase adjustment of the reconfigurable filter phase shifter is [0, pi/2 ]]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi/2, pi)]When the temperature of the water is higher than the set temperature,
when the range of the reconfigurable filtering phase shifter for realizing signal phase adjustment is (pi, 3 pi/2)]When the temperature of the water is higher than the set temperature,
when it is used asWhen the range of the reconfigurable filtering phase shifter for realizing the signal phase adjustment is (pi 3/2,2 pi),
and k represents the output power ratio of the reconfigurable filtering branch line bridge, and the positive coupling coefficient and the negative coupling coefficient respectively correspond to the half-wavelength stepped impedance resonators to form capacitive coupling and inductive coupling.
4. A reconfigurable filter phase shifter according to claim 1, wherein varactor diodes Dr1, Dr2, Dr3 and Dr4 mounted at the low impedance end of each half-wavelength ladder impedance resonator are used as frequency tuning capacitors; the varactor diodes Dm and Dn are connected in series, are arranged between the high-impedance ends of every two adjacent half-wavelength stepped impedance resonators and are used for controlling the interstage coupling of the two adjacent half-wavelength stepped impedance resonators; the variable capacitance diodes De1 and De2 are respectively installed at the input port and the output port of the reconfigurable filtering branch line bridge after being respectively connected with the fixed capacitor in series, and are used for adjusting the impedance matching of the input port and the output port of the reconfigurable filtering branch line bridge; by adjusting the capacitance values of the variable capacitance diodes Dm and Dn which are installed between the adjacent half-wavelength stepped impedance resonators and connected in series, when the capacitance values of the variable capacitance diodes Dm and Dn are changed from small to large until the capacitance values exceed a certain threshold value, the coupling property between the adjacent half-wavelength stepped impedance resonators is changed from inductive coupling to capacitive coupling.
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| CN114464973A (en) * | 2022-01-19 | 2022-05-10 | 电子科技大学 | Reconfigurable filter attenuator based on continuously adjustable center frequency |
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