CN115458882B - Balance type broadband phase shifter - Google Patents
Balance type broadband phase shifter Download PDFInfo
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- CN115458882B CN115458882B CN202211114951.2A CN202211114951A CN115458882B CN 115458882 B CN115458882 B CN 115458882B CN 202211114951 A CN202211114951 A CN 202211114951A CN 115458882 B CN115458882 B CN 115458882B
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- H—ELECTRICITY
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
- H01P1/184—Strip line phase-shifters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the technical field of microwave communication, and particularly relates to a balanced broadband phase shifter. The invention adopts a single-layer microstrip structure, and the whole structure is symmetrical along the central line in the vertical direction, and comprises a first feeder line, a fourth feeder line, a half-wavelength coupling microstrip line, a first coupling microstrip line, a second coupling microstrip line, a first microstrip line, a second microstrip line, a step impedance line, a first capacitor group and a second capacitor group; one end of the first feeder line and one end of the second feeder line are respectively connected with two ends of the upper side of the half-wavelength coupling microstrip line; one end of the third feeder line and one end of the fourth feeder line are respectively connected with two ends of the lower side of the half-wavelength coupling microstrip line; the left two ends of the half-wavelength coupling microstrip line are respectively connected with one end of the first capacitor group; the right two ends of the half-wavelength coupling microstrip line are respectively connected with one end of the second capacitor group; the upper end of the step impedance line is connected with the midpoint end of the lower side of the half-wavelength coupling microstrip line. The invention has the advantages of wide band, small size, low loss, simple structure and easy processing.
Description
Technical Field
The invention belongs to the technical field of microwave communication, and particularly relates to a balanced broadband phase shifter.
Background
The phase shifter can adjust and control the phase of electromagnetic waves, is widely applied to phased array antennas, circularly polarized antennas, beam forming networks and satellite mobile communication systems, and the quality of the whole communication system is directly affected by the performance of the phase shifter. The wireless communication system is being miniaturized, highly integrated and low-loss, which causes serious problems such as environmental noise and electromagnetic crosstalk in the system, so that the balanced phase shifter with the functions of differential mode phase shifting and common mode suppression is receiving a great deal of attention. In addition, with the rapid development of wireless communication systems, spectrum resources are increasingly strained, and broadband systems become a necessary trend of future wireless communication development due to advantages of good compatibility, high transmission rate and the like. Thus, balanced phase shifters featuring broadband, miniaturization, and low loss meet the development needs of wireless communication systems, but currently designs of balanced phase shifters featuring both broadband, small size, and low loss remain an important challenge.
Various balanced phase shifter design techniques are currently reported. The method of loading the half-wavelength microstrip line by using the single half-wavelength coupling line can realize broadband differential mode impedance matching and broadband differential mode phase shifting, but the working bandwidth is limited by the common mode rejection bandwidth. Wideband common mode rejection and small size can be achieved using asymmetric methods, but with narrower operating bandwidths and larger losses. The method adopting the two-stage branch line structure or the T-shaped multimode resonator can realize a wide phase shift range, but has larger size. The filtering phase shifting function can be realized by adopting a method that three ends of a pair of folding coupling lines are respectively connected with half-wavelength microstrip lines, but the bandwidth is narrower. The adjustable differential mode phase shift function can be realized by using the liquid crystal technology, but the working bandwidth is narrow and the structure is complex.
Disclosure of Invention
The invention aims at the problems of the technology and provides a balanced broadband phase shifter. The invention aims to improve the working bandwidth of a balanced type phase shifter, reduce the size and the loss under the condition of guaranteeing the broadband, and realize the balanced type broadband phase shifter with small size, low loss and simple structure.
In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows: a balanced broadband phase shifter adopts a single-layer microstrip structure, and the whole structure is symmetrical along the central line of the vertical direction, and comprises a first feeder line, a second feeder line, a half-wavelength coupling microstrip line, a first coupling microstrip line, a second coupling microstrip line, a first microstrip line, a second microstrip line, a step impedance line, a first capacitor group and a second capacitor group; one end of the first feeder line and one end of the second feeder line are respectively connected with two ends of the upper side of the half-wavelength coupling microstrip line; one ends of the third feeder line and the fourth feeder line are respectively connected with two ends of the lower side of the half-wavelength coupling microstrip line; the left two ends of the half-wavelength coupling microstrip line are respectively connected with one end of the first capacitor group; the other end of the first capacitor group is connected with one end of a first coupling microstrip line respectively; the other end of the first coupling microstrip line is connected with the first microstrip line; the right two ends of the half-wavelength coupling microstrip line are respectively connected with one end of the second capacitor group; the other end of the second capacitor group is connected with one end of a second coupling microstrip line respectively; the other end of the second coupling microstrip line is connected with the second microstrip line; and the upper end of the step impedance line is connected with the midpoint end of the lower side of the half-wavelength coupling microstrip line.
Further as a preferable technical scheme of the invention, the other ends of the first feeder line and the second feeder line are respectively externally connected with a pair of balanced ports; the other ends of the third feeder line and the fourth feeder line are respectively externally connected with another pair of balanced ports.
Further, as a preferred technical scheme of the invention, the first capacitor group and the second capacitor group comprise 2 capacitors which are arranged in parallel up and down.
Further as a preferable technical scheme of the invention, the first microstrip line and the second microstrip line are both square-shaped microstrip lines; an open end is arranged on the right side of the first microstrip line; the upper side and the lower side of the right opening end of the first microstrip line are connected with the other end of the first coupling microstrip line; an open end is arranged on the left side of the second microstrip line; the upper side and the lower side of the left opening end of the second microstrip line are connected with the other end of the second coupling microstrip line.
Further as a preferred technical scheme of the invention, when the phase shifter is excited by a differential mode signal, the half-wavelength coupling microstrip line is equivalent to an ideal electric wall along the central symmetry plane of the vertical direction, the step impedance line does not work, the half-wavelength coupling microstrip line is equivalent to a quarter-wavelength short circuit branch, a plurality of differential mode transmission poles can be obtained by combining a first coupling microstrip line and a second coupling microstrip line, of which two ends are respectively connected with a first capacitor bank, a second capacitor bank and the first microstrip line and the second microstrip line, so as to realize broadband differential mode impedance matching, and the differential mode impedance matching bandwidth and the differential mode phase shifting bandwidth are controlled by adjusting the capacitance values of the half-wavelength coupling microstrip line, the first coupling microstrip line and the second coupling microstrip line, the first capacitor bank and the second capacitor bank, and the impedance of the first microstrip line and the second microstrip line; when excited by a common mode signal, the central symmetry plane of the phase shifter in the vertical direction is equivalent to an ideal magnetic wall, the half-wavelength coupling microstrip line is equivalent to a quarter-wavelength open-circuit branch, and a plurality of common mode transmission zero points can be obtained by combining a first coupling microstrip line, a second coupling microstrip line and a step impedance line, wherein the two ends of the first coupling microstrip line, the second coupling microstrip line and the step impedance line are respectively connected with a first capacitor bank and a second capacitor bank, and the first microstrip line and the second microstrip line, so that broadband common mode suppression is realized, and the step impedance line improves the common mode suppression bandwidth under the condition of not influencing the differential mode operation.
Compared with the prior art, the balanced broadband phase shifter provided by the invention has the following technical effects:
(1) The invention realizes the balance phase shifter with broadband differential mode impedance matching, broadband differential mode phase shifting and broadband common mode suppression simultaneously by combining a half-wavelength coupling microstrip line and a pair of coupling microstrip lines with two ends respectively connected with a capacitor and the microstrip line, and has the advantages of small size, low loss, simple structure and easy processing.
(2) The whole circuit structure is bilaterally symmetrical and vertically asymmetrical, so that the performance regulation and control of differential mode impedance matching, differential mode phase shifting and common mode suppression are considered.
(3) The invention can be realized by microstrip lines, coplanar waveguides, strip lines and other transmission line forms.
Drawings
FIG. 1 is a schematic diagram of a compact balanced broadband phase shifter according to an embodiment of the present invention;
FIG. 2 is a simulation diagram of the differential mode impedance matching response of a compact balanced broadband phase shifter according to an embodiment of the present invention;
FIG. 3 is a simulation of the differential mode phase shift response of a compact balanced broadband phase shifter according to an embodiment of the present invention;
FIG. 4 is a simulation of the common mode rejection response of a compact balanced broadband phase shifter according to an embodiment of the present invention;
in the drawing, a 1-first feeder line, a 2-second feeder line, a 3-third feeder line, a 4-fourth feeder line, a 5-half-wavelength coupling microstrip line, a 6-first coupling microstrip line, a 7-second coupling microstrip line, an 8-first microstrip line, a 9-second microstrip line and a 10-step impedance line are arranged.
Detailed Description
The invention is further explained in the following detailed description with reference to the drawings so that those skilled in the art can more fully understand the invention and can practice it, but the invention is explained below by way of example only and not by way of limitation.
As shown in fig. 1, the balanced broadband phase shifter provided by the invention adopts a single-layer microstrip structure, and the whole structure is symmetrical along the central line in the vertical direction, and comprises a first feeder line 1 to a fourth feeder line 4, a half-wavelength coupling microstrip line 5, a first coupling microstrip line 6, a second coupling microstrip line 7, a first microstrip line 8, a second microstrip line 9, a step impedance line 10, a first capacitor group and a second capacitor group; one end of the first feeder line 1 and one end of the second feeder line 2 are respectively connected with two upper ends of the half-wavelength coupling microstrip line 5; one end of the third feeder line 3 and one end of the fourth feeder line 4 are respectively connected with two lower ends of the half-wavelength coupling microstrip line 5; the left two ends of the half-wavelength coupling microstrip line 5 are respectively connected with one end of the first capacitor group; the other end of the first capacitor group is connected with one end of the first coupling microstrip line 6 respectively; the other end of the first coupling microstrip line 6 is connected with a first microstrip line 8; the right two ends of the half-wavelength coupling microstrip line 5 are respectively connected with one end of the second capacitor group; the other end of the second capacitor group is respectively connected with one end of a second coupling microstrip line 7; the other end of the second coupling microstrip line 7 is connected with a second microstrip line 9; the upper end of the step impedance line 10 is connected with the midpoint end of the lower side of the half-wavelength coupling microstrip line 5.
The other ends of the first feeder line 1 and the second feeder line 2 are respectively externally connected with a pair of balanced ports; the other ends of the third feeder line 3 and the fourth feeder line 4 are respectively externally connected with another pair of balanced ports. The first capacitor group and the second capacitor group comprise 2 capacitors which are arranged in parallel up and down.
The first microstrip line 8 and the second microstrip line 9 are both square-shaped microstrip lines; the right side of the first microstrip line 8 is provided with an open end; the upper side and the lower side of the right opening end of the first microstrip line 8 are connected with the other end of the first coupling microstrip line 6; the left side of the second microstrip line 9 is provided with an open end; the upper and lower sides of the left open end of the second microstrip line 9 are connected to the other end of the second coupling microstrip line 7.
When the phase shifter is excited by a differential mode signal, the center symmetry plane of the half-wavelength coupling microstrip line 5 along the vertical direction is equivalent to an ideal electric wall, the step impedance line 10 does not work, the half-wavelength coupling microstrip line 5 is equivalent to a quarter-wavelength short circuit branch, a plurality of differential mode transmission poles can be obtained by combining a first coupling microstrip line 6 and a second coupling microstrip line 7, two ends of which are respectively connected with a first capacitor bank, a second capacitor bank and a first microstrip line 8 and a second microstrip line 9, so that broadband differential mode impedance matching is realized, and the differential mode impedance matching bandwidth and differential mode phase shifting bandwidth are controlled by adjusting the capacitance values of the half-wavelength coupling microstrip line 5, the first coupling microstrip line 6 and the second coupling microstrip line 7, the first capacitor bank and the second capacitor bank and the impedance of the first microstrip line 8 and the second microstrip line 9; when excited by a common mode signal, the central symmetry plane of the phase shifter in the vertical direction is equivalent to an ideal magnetic wall, the half-wavelength coupling microstrip line 5 is equivalent to a quarter-wavelength open-circuit branch, and a plurality of common mode transmission zero points can be obtained by combining the first coupling microstrip line 6, the second coupling microstrip line 7 and the step impedance line 10, of which the two ends are respectively connected with the first capacitor bank, the second capacitor bank, the first microstrip line 8 and the second microstrip line 9, so that broadband common mode suppression is realized, and the step impedance line 10 improves the common mode suppression bandwidth under the condition of not influencing the differential mode operation.
The reference line and the main line structure of the phase shifter are the same, as shown in fig. 1, the difference is that the physical size values of the corresponding parts are different, and the designed phase shift reference value is realized through the phase difference corresponding to the length difference of the first feeder line 1 to the fourth feeder line 4 of the reference line and the main line.
This embodiment is a design of the 45 DEG and 90 DEG phase shifter of the present inventionIn the case, differential mode phase shifting of 45 degrees and 90 degrees is realized respectively, the center frequency is set to be 3.5GHz, and FIG. 2 is a simulation diagram of differential mode impedance matching response of the compact balanced broadband phase shifter in the embodiment of the invention; FIG. 3 is a simulation of the differential mode phase shift response of a compact balanced broadband phase shifter according to an embodiment of the present invention; FIG. 4 is a simulation of the common mode rejection response of a compact balanced broadband phase shifter according to an embodiment of the present invention; for the reference line, the 15-dB differential mode impedance matching bandwidth is 2.13 GHz-5.74 GHz (103.1%), the maximum insertion loss in the passband is 0.25dB, and the 10-dB common mode rejection width is 2.1 GHz-6.2 GHz (117.1%). For a 45 DEG phase shifter main line, the 15-dB differential mode impedance matching bandwidth is 1.97 GHz-5.75 GHz (108%), the minimum insertion loss in the passband is 0.23dB, and the 10-dB common mode rejection bandwidth is 2.22 GHz-6.2 GHz (113.7%). The 15-dB differential mode impedance matching bandwidth of the 90 DEG phase shifter main line is 1.32 GHz-6.29 GHz (142%), the minimum insertion loss in the passband is 0.27dB, and the 10-dB common mode rejection bandwidth is 2.15 GHz-6.32 GHz (119.1%). The phase shift bandwidths of 45 DEG + -2.5 DEG and 90 DEG + -4.5 DEG are respectively 2.23 GHz-5.74 GHz (100.3%) and 2.21 GHz-5.74 GHz (100.8%). Thus, for the 45 ° and 90 ° phase shifters, the operating bandwidths of the 15-dB differential mode impedance matching bandwidths, the 10-dB common mode rejection bandwidths, and the phase shift bandwidths with phase shift errors within ±2.5° and ±5° covering both the reference line and the main line are 2.23GHz to 5.74GHz (100.3%) and 2.21GHz to 5.74GHz (100.8%), respectively. The electrical dimensions of the reference line, the 45 ° main line and the 90 ° main line are respectively 0.9λ g ×0.23λ g 、0.77λ g ×0.24λ g And 0.74 lambda g ×0.34λ g (λ g A guided wave wavelength corresponding to the center frequency). In this case, RO4003C substrate was used, which had a dielectric constant of 3.38, a loss angle of 0.0027 and a thickness of 0.813mm.
The invention discloses a balanced broadband phase shifter which is realized by combining a half-wavelength coupling microstrip line with a pair of coupling microstrip lines with two ends respectively connected with a capacitor and the microstrip line and has the advantages of broadband differential mode impedance matching, broadband differential mode phase shifting and broadband common mode suppression, small size, low loss, simple structure and easy processing.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. A balanced broadband phase shifter adopts a single-layer microstrip structure, and the whole structure is symmetrical along the central line of the vertical direction, and is characterized by comprising a first feeder line (1) to a fourth feeder line (4), a half-wavelength coupling microstrip line (5), a first coupling microstrip line (6), a second coupling microstrip line (7), a first microstrip line (8), a second microstrip line (9), a step impedance line (10), a first capacitor group and a second capacitor group; one end of the first feeder line (1) and one end of the second feeder line (2) are respectively connected with two ends of the upper side of the half-wavelength coupling microstrip line (5); one end of the third feeder line (3) and one end of the fourth feeder line (4) are respectively connected with two ends of the lower side of the half-wavelength coupling microstrip line (5); the left two ends of the half-wavelength coupling microstrip line (5) are respectively connected with one end of the first capacitor group; the other end of the first capacitor group is connected with one end of a first coupling microstrip line (6) respectively; the other end of the first coupling microstrip line (6) is connected with a first microstrip line (8); the two ends of the right side of the half-wavelength coupling microstrip line (5) are respectively connected with one end of the second capacitor group; the other end of the second capacitor group is connected with one end of a second coupling microstrip line (7) respectively; the other end of the second coupling microstrip line (7) is connected with a second microstrip line (9); the upper end of the step impedance line (10) is connected with the midpoint end of the lower side of the half-wavelength coupling microstrip line (5); the other ends of the first feeder line (1) and the second feeder line (2) are respectively externally connected with a pair of balanced ports; the other ends of the third feeder line (3) and the fourth feeder line (4) are respectively externally connected with another pair of balanced ports; the first capacitor group and the second capacitor group comprise 2 capacitors which are arranged in parallel up and down.
2. A balanced broadband phase shifter according to claim 1, characterized in that the first microstrip line (8) and the second microstrip line (9) are both mouth-shaped microstrip lines; an open end is arranged on the right side of the first microstrip line (8); the upper side and the lower side of the right opening end of the first microstrip line (8) are connected with the other end of the first coupling microstrip line (6); an open end is arranged on the left side of the second microstrip line (9); the upper side and the lower side of the left opening end of the second microstrip line (9) are connected with the other end of the second coupling microstrip line (7).
3. The balanced broadband phase shifter according to claim 1, wherein when the phase shifter is excited by a differential mode signal, a half-wavelength coupling microstrip line (5) is equivalent to an ideal electric wall along a central symmetry plane in a vertical direction, a step impedance line (10) does not work, the half-wavelength coupling microstrip line (5) is equivalent to a quarter-wavelength short-circuit branch, a first coupling microstrip line (6) and a second coupling microstrip line (7) which are respectively connected with a first capacitor bank, a second capacitor bank and the first microstrip line (8) and the second microstrip line (9) at two ends are combined, a plurality of differential mode transmission poles can be obtained by the second coupling microstrip line (7), broadband differential mode impedance matching is realized, and a differential mode impedance matching bandwidth and a differential mode phase shift bandwidth are controlled by adjusting the half-wavelength coupling microstrip line (5), the parity mode impedance of the first coupling microstrip line (6) and the second coupling microstrip line (7), the capacitance of the first capacitor bank and the second capacitor bank and the impedance of the first microstrip line (8) and the second microstrip line (9); when excited by a common mode signal, the central symmetry plane of the phase shifter in the vertical direction is equivalent to an ideal magnetic wall, the half-wavelength coupling microstrip line (5) is equivalent to a quarter-wavelength open-circuit branch, and a plurality of common mode transmission zero points can be obtained by combining a first coupling microstrip line (6), a second coupling microstrip line (7) and a step impedance line (10) of which the two ends are respectively connected with a first capacitor group, a second capacitor group and the first microstrip line (8) and the second microstrip line (9), so that broadband common mode suppression is realized, and the step impedance line (10) improves the common mode suppression bandwidth under the condition of not influencing the differential mode operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211114951.2A CN115458882B (en) | 2022-09-14 | 2022-09-14 | Balance type broadband phase shifter |
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| CN202211114951.2A CN115458882B (en) | 2022-09-14 | 2022-09-14 | Balance type broadband phase shifter |
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| CN115458882A CN115458882A (en) | 2022-12-09 |
| CN115458882B true CN115458882B (en) | 2023-08-25 |
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| CN114050382A (en) * | 2021-11-16 | 2022-02-15 | 南通大学 | Balanced type broadband voltage-controlled adjustable phase shifter |
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| JP5012883B2 (en) * | 2009-12-11 | 2012-08-29 | 株式会社村田製作所 | Laminated balance filter |
| US20130027273A1 (en) * | 2011-07-27 | 2013-01-31 | Tdk Corporation | Directional coupler and wireless communication device |
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2022
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| CN2874794Y (en) * | 2006-04-04 | 2007-02-28 | 华为技术有限公司 | Balance and unbalance converter |
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| CN106816678A (en) * | 2017-01-18 | 2017-06-09 | 大连海事大学 | It is a kind of with any output amplitude and phase across directional coupler |
| CN111710946A (en) * | 2020-06-08 | 2020-09-25 | 南通大学 | Single-end type microstrip stub band-pass filter of broadband |
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