Microstrip filtering phase shifter

Abstract

The utility model aims to provide a microstrip filtering phase shifter. The microstrip filtering phase shifter comprises a main line and a reference line which are arranged on a dielectric substrate. The main wire comprises a metal wire I, a metal wire II, a metal wire III, a metal wire IV and a metal wire V; one end of the metal wire I is connected with the Port1 port, the other end of the metal wire I is connected with one end of the metal wire II, the metal wire II is coupled with the left section of the metal wire III, the right section of the metal wire III is coupled with the metal wire IV, one end of the metal wire V is connected with the Port2 port, and the other end of the metal wire V is connected with the metal wire IV; the reference line is arranged above the main line, and two ends of the reference line are respectively connected with the Port 3 port and the Port 4 port. According to the utility model, a filtering function characteristic and a phase shift function characteristic are integrated on one device, miniaturization is realized, and the advantages of wide bandwidth, low insertion loss and small phase deviation are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave radio frequency communication, in particular to a microstrip filtering phase shifter. Background Art

[0002] In wireless communication systems, phase shifters are one of the most important microwave RF devices. Because they can adjust the phase of electromagnetic waves, they are widely used in phased arrays and beamforming networks. The construction of phased arrays and beamforming networks requires a large number of phase shifters, and the performance of phase shifters directly determines the performance of phased arrays and beamforming networks. If the operating bandwidth and phase deviation of the phase shifter cannot meet the requirements, it will further cause the wireless signal to be unable to be transmitted or received in the predetermined direction, thus failing to achieve high communication quality and low channel interference.

[0003] With the rapid development of modern communication technology, higher requirements are placed on the miniaturization of wireless communication systems and communication equipment. As an indispensable microwave device in wireless communication systems, filters are widely used in various parts of communication systems.

[0004] By integrating filters with other functional devices, such as filter power dividers, filter baluns, filter switches, filter antennas and other multifunctional microwave components (excellent functional characteristics such as low insertion loss and miniaturization), the performance of the entire communication system is improved and the structural size is reduced. The filter phase shifter is a microwave device that combines the filtering characteristics of the filter with the phase shift characteristics of the phase shifter. The functions of two devices are realized on one microwave device at the same time, with the characteristics of miniaturization and low insertion loss. This will be of great significance to the further development of phased array antennas and beamforming networks that require integrated filtering and phase shifting.

[0005] In 2007, AM Abbosh proposed the use of a three-layer wide-side coupler structure to realize a 30-degree and 45-degree wide-side coupled broadband phase shifter. Its coupling structure consists of upper and lower elliptical microstrip patches, and the wide-side tight coupling of the upper and lower patches is achieved by etching an elliptical hole in the middle ground. Therefore, the 30-degree and 45-degree phase shifters can operate at 3~11GHz, with a maximum phase deviation of ±3 degrees. Although the phase shifter has good phase shift performance, the use of a multi-layer dielectric substrate wide-side coupling structure leads to a large physical size, which is not conducive to integration; and the phase shifter uses a uniform transmission line as a reference line, resulting in the inconsistency between the passband of the main line and the passband of the reference line, so that the phase shifter only achieves the phase shift characteristic, but loses the filtering characteristic.

[0006] In 2014, SY Zheng first proposed a multifunctional phase shifter with harmonic suppression function. A quarter-wavelength branch is inserted into the phase shift structure of the traditional branch-loaded broadband phase shifter to form a third harmonic band-stop element, so that a constant broadband phase shift function and harmonic suppression function can be achieved simultaneously. The test results show that it achieves a broadband phase shift output of 44±4 degrees in the frequency range of 2.5~5.5GHz (bandwidth 75%), and the third harmonic suppression at 8GHz reaches 20dB. However, the working bandwidth of the phase shifter cannot be controlled, so the filtering function cannot be achieved.

[0007] In summary, the research on filter phase shifters with wide bandwidth, low insertion loss and small phase deviation is of great significance. Summary of the invention

[0008] The utility model aims to provide a microstrip filtering phase shifter, which integrates filtering function characteristics and phase shifting function characteristics on one device, realizes miniaturization, and has the advantages of wide bandwidth, low insertion loss and small phase deviation.

[0009] The microstrip filter phase shifter comprises a main line and a reference line arranged on a dielectric substrate;

[0010] The main wires include metal wire I, metal wire II, metal wire III, metal wire IV, and metal wire V;

[0011] One end of the metal wire I is connected to Port 1, and the other end is connected to one end of the metal wire II. The metal wire II is coupled to the left section of the metal wire III, and the right section of the metal wire III is coupled to the metal wire IV. One end of the metal wire V is connected to Port 2, and the other end is connected to the metal wire IV.

[0012] The reference line is arranged above the main line, and two ends of the reference line are respectively connected to Port3 and Port4.

[0013] The metal wire II and the metal wire IV are respectively located at the upper and lower sides of the metal wire III.

[0014] The widths of the metal wire II, metal wire III and metal wire IV are equal; the widths of the metal wire I and metal wire V are equal; the width of the metal wire I is 9.8-12.5 times the width of the metal wire II.

[0015] The reference line includes a metal wire VI, a metal wire VII, and a metal wire VIII. The metal wire VI is coupled to the left section of the metal wire VII, and the metal wire VIII is coupled to the right section of the metal wire VII.

[0016] The metal wire VI and the metal wire VIII are respectively located at the upper and lower sides of the metal wire VII.

[0017] The widths of the metal wire VI, metal wire VII and metal wire VIII are equal, and the width of the metal wire VI is 0.9-1.4 times of the width of the metal wire II.

[0018] The metal wire I, metal wire II, metal wire III, metal wire IV, metal wire V, metal wire VI, metal wire VII, and metal wire VIII are parallel to each other.

[0019] The signal phase of the main line at the center frequency is delayed by 270 degrees, the signal phase of the reference line at the center frequency is delayed by 180 degrees, and the phase difference between the main line and the reference line at the center frequency is 90 degrees.

[0020] The Port 1, Port 2, Port 3 and Port 4 are all made of copper, and the characteristic impedance is 50Ω.

[0021] The dielectric substrate is made of Rogers RO4003C, with a dielectric constant of 3.55 and a thickness of 1.524 mm.

[0022] The working principle of the utility model is:

[0023] The working principle of the utility model is divided into the filtering function principle and the phase shift function principle. The filtering function principle: the metal conductor II is coupled with the left section of the metal conductor III, and the right section of the metal conductor III is coupled with the metal conductor IV to obtain the bandpass filtering frequency response of the main line; the metal conductor VI is coupled with the left section of the metal conductor VII, and the right section of the metal conductor VII is coupled with the metal conductor VIII to obtain the bandpass filtering frequency response of the reference line;

[0024] Principle of phase shift function: At the center frequency, the signal phase of the main line is delayed by 270 degrees, among which the partial signal phases of metal conductor II, metal conductor III, and metal conductor IV are delayed by 180 degrees, and the signal phases of metal conductor I and metal conductor V are delayed by 45 degrees; at the center frequency, the partial signal phases of metal conductor VI, metal conductor VII, and metal conductor VIII on the reference line are delayed by 180 degrees; therefore, the phase difference between the main line and the reference line is 90 degrees at the center frequency.

[0025] The utility model of the present invention has a simple structure, and integrates the filtering function characteristics and the phase shifting function characteristics on one device to achieve miniaturization. Moreover, when the utility model is working, the filtering function characteristics have the advantages of wide bandwidth and low insertion loss; the phase shifting function characteristics have the advantages of wide bandwidth and small phase deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a microstrip filter phase shifter according to Embodiment 1;

[0027] Figure 2 The S parameter simulation diagram of the microstrip filter phase shifter provided in Example 2;

[0028] Figure 3 A simulation diagram of the 90° phase shift slope characteristic of the microstrip filter phase shifter provided in Example 2;

[0029] Figure 4 A simulation diagram of the phase shift characteristics of the microstrip filter phase shifter provided in Example 2;

[0030] The serial numbers and names in the figure are as follows:

[0031] 1-metal wire I, 2-metal wire II, 3-metal wire III, 4-metal wire IV, 5-metal wire V, 6-metal wire VI, 7-metal wire VII, 8-metal wire VIII. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0033] like Figure 1 As shown, the microstrip filter phase shifter includes a main line and a reference line arranged on a dielectric substrate;

[0034] The main wire includes metal wire Ⅰ1, metal wire Ⅱ2, metal wire Ⅲ3, metal wire Ⅳ4, and metal wire Ⅴ5;

[0035] One end of the metal wire Ⅰ1 is connected to Port1, and the other end is connected to one end of the metal wire Ⅱ2. The metal wire Ⅱ2 is coupled to the left section of the metal wire Ⅲ3, and the right section of the metal wire Ⅲ3 is coupled to the metal wire Ⅳ4. One end of the metal wire Ⅴ5 is connected to Port2, and the other end is connected to the metal wire Ⅳ4. The metal wire Ⅱ2 and the metal wire Ⅳ4 are respectively located on the upper and lower sides of the metal wire Ⅲ3.

[0036] The widths of the metal wire II2, metal wire III3 and metal wire IV4 are equal; the widths of the metal wire I1 and metal wire V5 are equal; the width of the metal wire I1 is 11.2 times the width of the metal wire II2.

[0037] The reference line is arranged above the main line, and two ends of the reference line are respectively connected to Port3 and Port4.

[0038] The reference line includes a metal wire VI6, a metal wire VII7, and a metal wire VIII8. The metal wire VI6 is coupled to the left section of the metal wire VII7, and the metal wire VIII8 is coupled to the right section of the metal wire VII7.

[0039] The metal wire VI6 and the metal wire VIII8 are respectively located at the upper and lower sides of the metal wire VII7.

[0040] The widths of the metal wire VI6, the metal wire VII7, and the metal wire VIII8 are equal, and the width of the metal wire VI6 is 1.3 times the width of the metal wire II2.

[0041] The metal wire Ⅰ1, metal wire Ⅱ2, metal wire Ⅲ3, metal wire Ⅳ4, metal wire Ⅴ5, metal wire Ⅵ6, metal wire Ⅶ7, and metal wire Ⅷ8 are parallel to each other.

[0042] The signal phase of the main line at the center frequency is delayed by 270 degrees, the signal phase of the reference line at the center frequency is delayed by 180 degrees, and the phase difference between the main line and the reference line at the center frequency is 90 degrees.

[0043] The Port 1, Port 2, Port 3 and Port 4 are all made of copper, and the characteristic impedance is 50Ω.

[0044] The dielectric substrate is made of Rogers RO4003C, with a dielectric constant of 3.55 and a thickness of 1.524 mm. Example 2

[0045] The microstrip filter phase shifter of Example 1 is used for simulation experiment

[0046] like Figure 2 As shown, the reference line's metal conductor Ⅵ6, metal conductor Ⅶ7, and metal conductor VIII are composed of two-section coupled microstrip line resonator cascades, which produce three transmission poles, a passband frequency response range of 2.12GHz-3.98GHz, an insertion loss of 0.32dB, and a return loss of 19.8dB; the main line's metal conductor Ⅱ2, metal conductor Ⅲ3, and metal conductor Ⅳ4 are composed of two-section coupled microstrip line resonator cascades, which produce three transmission poles, a passband frequency response range of 1.90GHz-4.19GHz, an insertion loss of 0.34dB, and a return loss of 17.4dB; the reference line frequency response range is included in the main line frequency response range, achieving excellent filtering function characteristics, and the filtering response range is 2.12GHz-3.98GHz.

[0047] like Figure 3As shown, in the passband with a center frequency of about 3 GHz, the phase slope of the main line and the phase slope of the reference line of the microstrip filter phase shifter are equal; at the center frequency, the signal phase of the main line is delayed by 270 degrees, among which the phase of some signals of metal conductor II, metal conductor III, and metal conductor IV is delayed by 180 degrees, and the phase of each signal of metal conductor I and metal conductor V is delayed by 45 degrees; at the center frequency, the phase of some signals of metal conductor VI, metal conductor VII, and metal conductor VIII on the reference line is delayed by 180 degrees; so the phase difference between the main line and the reference line is 90 degrees at the center frequency.

[0048] Microstrip filter phase shifter Figure 4 As shown in the figure, after the phase adjustment of the main line and the reference line, the microstrip filter phase shifter achieves a constant phase shift of 90 degrees at a center frequency of 3 GHz, and a maximum phase deviation of 2 degrees within the passband (2.37 GHz-3.74 GHz) with a center frequency of about 3 GHz, achieving excellent phase shift characteristics.

Claims

1. A microstrip filter phase shifter, comprising a main line and a reference line arranged on a dielectric substrate; characterized in that: The main line comprises a metal wire I (1), a metal wire II (2), a metal wire III (3), a metal wire IV (4), and a metal wire V (5); One end of the metal wire I (1) is connected to Port 1, and the other end is connected to one end of the metal wire II (2). The metal wire II (2) is coupled to the left section of the metal wire III (3), and the right section of the metal wire III (3) is coupled to the metal wire IV (4). One end of the metal wire V (5) is connected to Port 2, and the other end is connected to the metal wire IV (4). The reference line is arranged above the main line, and two ends of the reference line are respectively connected to Port3 and Port4.

2. The microstrip filter phase shifter according to claim 1, characterized in that: The metal wire II (2) and the metal wire IV (4) are respectively located on the upper and lower sides of the metal wire III (3).

3. The microstrip filter phase shifter according to claim 1, characterized in that: The widths of the metal wire II (2), metal wire III (3), and metal wire IV (4) are equal; the widths of the metal wire I (1) and metal wire V (5) are equal; the width of the metal wire I (1) is 9.8-12.5 times the width of the metal wire II (2).

4. The microstrip filter phase shifter according to claim 1, characterized in that: The reference line includes a metal wire VI (6), a metal wire VII (7), and a metal wire VIII (8). The metal wire VI (6) is coupled to the left section of the metal wire VII (7), and the metal wire VIII (8) is coupled to the right section of the metal wire VII (7).

5. The microstrip filter phase shifter according to claim 4, characterized in that: The metal wire VI (6) and the metal wire VIII (8) are respectively located on the upper and lower sides of the metal wire VII (7).

6. The microstrip filter phase shifter according to claim 4, characterized in that: The widths of the metal wire VI (6), the metal wire VII (7), and the metal wire VIII (8) are equal, and the width of the metal wire VI (6) is 0.9-1.4 times the width of the metal wire II (2).

7. The microstrip filter phase shifter according to claim 4, characterized in that: The metal wire I (1), metal wire II (2), metal wire III (3), metal wire IV (4), metal wire V (5), metal wire VI (6), metal wire VII (7), and metal wire VIII (8) are parallel to each other.

8. The microstrip filter phase shifter according to claim 4, characterized in that: The signal phase of the main line at the center frequency is delayed by 270 degrees, the signal phase of the reference line at the center frequency is delayed by 180 degrees, and the phase difference between the main line and the reference line at the center frequency is 90 degrees.

9. The microstrip filter phase shifter according to claim 1, characterized in that: The Port 1, Port 2, Port 3 and Port 4 are all made of copper, and the characteristic impedance is 50Ω.

10. The microstrip filter phase shifter according to claim 1, characterized in that: The dielectric substrate is made of RogersRO4003C, with a dielectric constant of 3.55 and a thickness of 1.524 mm.

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