Ceramic dielectric waveguide filter for S-band satellite communication and communication equipment

Abstract

The invention discloses a ceramic dielectric waveguide filter for S-band satellite communication and communication equipment, and the filter comprises a dielectric waveguide body which comprises a third resonator, a fourth resonator, and a first resonator, a second resonator, a fifth resonator and a sixth resonator which are disposed on the same horizontal line. The third resonator and the fourth resonator are symmetrically arranged on the same side of the horizontal line; a first communicating shallow blind groove is formed between the first resonator and the second resonator, and a second communicating shallow blind groove is formed between the fifth resonator and the sixth resonator, so that magnetic coupling is achieved. A coupling shallow blind hole I is formed between the second resonator and the third resonator, and a coupling shallow blind hole II is formed between the fourth resonator and the fifth resonator, so that magnetic coupling is realized; a deep coupling blind groove is formed between the third resonator and the fourth resonator; a deep coupling blind hole is arranged between the second resonator and the fifth resonator. The filter provided by the invention can improve the signal selectivity and stability in the 5G frequency band, and has good electrical performance and miniaturization at the same time.

Description

Technical Field

[0001] The present invention relates to the field of communication equipment, in particular to a ceramic dielectric waveguide filter and communication equipment for S-band satellite communication. Background Art

[0002] In current satellite communication systems, filters are an important part of signal processing, and their performance significantly affects the reliability and quality of communication. Existing metal waveguide filters generally have problems such as high insertion loss, poor frequency selectivity, and large size. These shortcomings make it difficult to achieve optimal configuration on satellite platforms with limited space, and they are easily affected by external interference in complex environments, thereby reducing the overall performance of the communication system.

[0003] Existing dielectric-loaded cavity filters have improved in terms of lightness and volume, but still face the problem of insufficient bandwidth and frequency adaptability. Especially in terms of signal suppression capabilities in the 5G frequency band (such as 3.5GHz), existing filters often cannot provide sufficient suppression levels, making it difficult to effectively control the impact of high-frequency interference. Therefore, there is an urgent need for a new type of filter that can improve signal selectivity and stability in the 5G frequency band while having good electrical performance and miniaturization characteristics. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a sixth-order broadband, transmission zero-adjustable S-band satellite communication ceramic dielectric waveguide filter. Another purpose of the present invention is to provide a communication device with good signal selectivity and stability.

[0005] Technical solution: The ceramic dielectric waveguide filter for S-band satellite communication described in the present invention includes a dielectric waveguide body, which includes a third resonator, a fourth resonator and a first resonator, a second resonator, a fifth resonator and a sixth resonator arranged on the same horizontal line, and the third resonator and the fourth resonator are symmetrically arranged on the same side of the horizontal line; a connecting shallow blind groove 1 is arranged between the first resonator and the second resonator, and a connecting shallow blind groove 2 is arranged between the fifth resonator and the sixth resonator to achieve magnetic coupling; a coupling shallow blind hole 1 is arranged between the second resonator and the third resonator, and a coupling shallow blind hole 2 is arranged between the fourth resonator and the fifth resonator to achieve magnetic coupling; a deep coupling blind groove is arranged between the third resonator and the fourth resonator; and a deep coupling blind hole is arranged between the second resonator and the fifth resonator.

[0006] Furthermore, the resonant cavities of the first resonator, the third resonator, the fourth resonator and the sixth resonator are all semicircular resonant cavities, and the resonant cavities of the second resonator and the fifth resonator are all rectangular resonant cavities.

[0007] Furthermore, the first resonator and the sixth resonator have the same structure.

[0008] Furthermore, a first resonant blind hole is arranged on the upper surface at the center of gravity of the first resonator, and a first feeding blind hole is arranged on the lower surface, and the diameter of the first feeding blind hole is greater than the diameter of the first feeding blind hole. A second resonant blind hole is arranged on the upper surface at the center of gravity of the second resonator, and the diameter and depth of the second resonant blind hole are the same as those of the first resonant blind hole.

[0009] Furthermore, the first resonant blind hole and the first feeding blind hole are both cylindrical, and there is at least one of them.

[0010] Furthermore, the third resonator, the fourth resonator and the fifth resonator have the same structure, and a third resonant blind hole is arranged on the upper surface at the center of gravity of the third resonator.

[0011] Furthermore, the connecting shallow blind groove 1 has the same structure as the coupling shallow blind hole 2. The connecting shallow blind groove 1 includes a cylindrical through hole and a shallow rectangular groove. The rectangular groove and the coupling shallow blind hole 1 and the coupling shallow blind hole 2 are arranged on the same side of the dielectric waveguide.

[0012] Furthermore, the deep coupling blind slot includes a rectangular through hole and a deep rectangular slot, and the deep rectangular slot and the first coupling shallow blind hole and the second coupling shallow blind hole are arranged on the same side of the dielectric waveguide.

[0013] Furthermore, the coupling coefficient of the ceramic dielectric waveguide filter for S-band satellite communication varies between -0.06 and 0.94. By controlling the depth and diameter of the upper blind hole, the center frequency of the resonator can be flexibly adjusted.

[0014] Furthermore, the dielectric waveguide is made of ceramic with a dielectric constant of 20.5, and a thin layer of silver is plated on its surface.

[0015] The communication device of the present invention comprises the ceramic dielectric waveguide filter for S-band satellite communication. When the bandwidth is between 3.6 and 4.1 GHz, the return loss is greater than 20 dB, the insertion loss is less than 1.0 dB, and the out-of-band suppression at 3.5 GHz is greater than 40 dB, which can meet the requirements of modern satellite communication systems.

[0016] Working principle: A sixth-order satellite communication filter with out-of-band transmission zeros is realized by coupling and cascading four semicircular rectangular dielectric waveguide resonators and two matrix dielectric waveguide resonators. The filter utilizes the miniaturized broadband resonance characteristics of the semicircular rectangular dielectric waveguide and the cross-coupling between the resonators to realize a high out-of-band suppression broadband bandpass filter. Strong magnetic coupling is achieved between the first resonator (semicircular rectangular resonator) and the second resonator (rectangular resonator), and between the sixth resonator (semicircular rectangular resonator) and the fifth resonator (rectangular resonator) through asymmetric coupling through holes and connecting shallow blind grooves. The coupling through holes are all arranged on the inner side of the resonator to reduce unnecessary parasitic coupling. The size of the magnetic coupling can be controlled by changing the depth of the coupling blind holes. Strong magnetic coupling is achieved between the second resonator and the third resonator (semicircular rectangular resonator), and between the fifth resonator and the fourth resonator (semicircular rectangular resonator) through shallow coupling blind holes. The depth of the blind holes can be changed. To control the size of magnetic coupling; electromagnetic hybrid coupling is achieved between the third resonator and the fourth resonator through a rectangular coupling through hole and a deep rectangular coupling blind slot, and the coupling size between the resonators can be controlled by changing the depth of the blind slot; cross-electric coupling is achieved between the second resonator and the fifth resonator through a deep coupling blind hole, which produces an out-of-band transmission zero point, and the size of the electric coupling can be controlled by changing the depth of the blind hole, thereby changing the position of the transmission zero point; in addition, additional cross-electric coupling is generated between the first resonator and the fifth resonator, and between the sixth resonator and the second resonator, thereby suppressing the high-frequency transmission zero point and widening the high-frequency bandwidth.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0018] 1. The filter can improve signal selectivity and stability in the 5G frequency band while having good electrical performance and miniaturization;

[0019] 2. A sixth-order broadband ceramic dielectric waveguide filter is realized by coupling between a semicircular rectangular resonator and a rectangular resonator. The filter has high out-of-band suppression for the 3.5 GHz frequency band of 5G communication and has high application value in the S-band satellite communication base station system.

[0020] 3. Based on the cross-coupling theory of non-adjacent resonators, deep-coupled blind holes are used to realize cross-electric coupling between the first resonator and the fifth resonator, the sixth resonator and the second resonator, which produces a steep transmission zero at the low end of the passband and improves the out-of-band selectivity;

[0021] 4. The input and output ports are at both ends of the filter, with high port isolation and are not easily interfered with, which can meet the integrated application of industrial devices;

[0022] 5. The depth of the blind hole can determine the position of the out-of-band transmission zero point. By changing the position of the coupling through hole and the depth of the shallow blind groove, the coupling coefficient can be flexibly changed between -0.06 and 0.94.

[0023] 6. The ceramic dielectric waveguide filter has a bandwidth between 3.6 and 4.1 GHz, a return loss greater than 20 dB, an insertion loss less than 1.0 dB, a transmission zero at the low end of the passband at 3.5 GHz, and an out-of-band suppression greater than 40 dB. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 is a top view of the present invention;

[0026] Figure 3 is a bottom view of the present invention;

[0027] Figure 4 This is a cross-sectional view of the AA surface of the present invention;

[0028] Figure 5 is a circuit coupling matrix diagram of the present invention;

[0029] Figure 6 It is a filtering performance diagram of the present invention. DETAILED DESCRIPTION

[0030] Example 1

[0031] like Figures 1 to 4 The dielectric waveguide body 1 of the S-band satellite communication ceramic dielectric waveguide filter is composed of two double semicircular rectangular dielectric waveguide cavities, specifically including four identical semicircular rectangular resonant cavities and two identical square resonant cavities, wherein the semicircular rectangular resonant cavity is composed of a semicircular resonant cavity and a rectangular resonant cavity. The dielectric waveguide body 1 is provided with a first resonator 11, a second resonator 12, a third resonator 13, a fourth resonator 14, a fifth resonator 15 and a sixth resonator 16, which are respectively arranged on six resonant cavities. The two input and output resonant cavities of the S-band satellite communication ceramic dielectric waveguide filter are semicircular rectangles. The first resonator 11, the second resonator 12, the fifth resonator 15 and the sixth resonator 16 are on the same straight line, and the third resonator 13 and the fourth resonator 14 are symmetrically arranged at one end of the straight line.

[0032] The radius of the semicircular part of the semicircular rectangular resonator first resonator 11, third resonator 13, fourth resonator 14, and sixth resonator 16 is 5mm (±0.01mm), and the length of the rectangular part is 8mm (±0.01mm) and the width is 5mm (±0.01mm). The length and width of the second resonator 12 and the fifth resonator 15 of the rectangular resonator are both 8mm (±0.01mm). The length of the connecting part between the second resonator 12 and the third resonator 13 is 7.61mm (±0.01mm), and the length of the connecting part between the fourth resonator 14 and the fifth resonator 15 is 7.61mm (±0.01mm). An asymmetric coupling through hole and a connecting shallow blind groove 17 are provided between the first resonator 11 and the second resonator 12. An asymmetric coupling through hole and a connecting shallow blind groove 21 are also symmetrically provided between the fifth resonator 15 and the sixth resonator 16. The diameter of the coupling through hole in the asymmetric coupling through hole and the connecting shallow blind groove 17 is 2 mm (±0.01 mm). The length of the connecting shallow blind groove in the asymmetric coupling through hole and the connecting shallow blind groove 17 is 6.07 mm (±0.01 mm), the width is 1.5 mm (±0.01 mm), and the depth is 1.1 mm (±0.01 mm). Rectangular side coupling between the semicircular rectangular resonator and the rectangular resonator is realized. A coupling shallow blind hole 18 is provided between the second resonator 12 and the third resonator 13. A coupling shallow blind hole 20 is also provided between the fifth resonator 15 and the fourth resonator 14. The coupling shallow blind hole 18 has a diameter of 2 mm (±0.01 mm) and a depth of 1.44 mm (±0.01 mm). Rectangular side coupling between the semicircular rectangular resonator and the rectangular resonator is realized. A rectangular coupling through hole and a rectangular deep coupling blind slot 19 are provided between the third resonator 13 and the fourth resonator 14. The rectangular coupling through hole and the rectangular deep coupling blind slot 19 are located below the center line of the third resonator 13 and the fourth resonator 14. The rectangular through hole 192 in the deep coupling blind slot 19 has a length of 2.99 mm (±0.01 mm) and a width of 1.5 mm (±0.01 mm). The deep rectangular slot 192 has a length of 2 mm (±0.01 mm), a width of 1.5 mm (±0.01 mm), and a depth of 3.03 mm (±0.01 mm) to realize rectangular side coupling between the two semicircular rectangular resonators. A deep coupling blind hole 22 is provided between the second resonator 12 and the fifth resonator 15. The deep coupling blind hole 22 has a diameter of 2 mm (±0.01 mm) and a depth of 4.77 mm (±0.01 mm), so as to realize rectangular side coupling between the two rectangular resonators.

[0033] The first resonator 11 includes a cylindrical first resonant blind hole 111 and a cylindrical first feeding blind hole 112. The first resonator 11 is arranged on the top surface of the dielectric waveguide, and the first feeding blind hole 112 is arranged on the bottom surface of the dielectric waveguide. The diameter of the first resonant blind hole 111 is larger than that of the first feeding blind hole 112, and the depth is close. The structure of the sixth resonator 16 is the same as that of the first resonator 11. The second resonator 12 includes a cylindrical second resonant blind hole 121. The second resonator 2 is arranged on the top surface of the dielectric waveguide 1. The diameter and depth of the second resonant blind hole 121 are equal to those of the first resonant blind hole 111. The third resonator 13, the fourth resonator 14 and the fifth resonator 15 have the same structure.

[0034] The diameters of the first resonant blind hole 111 and the second resonant blind hole 121 are both 3 mm (± 0.01 mm), the depth of the first resonant blind hole 111 is 1.77 mm (± 0.01 mm), the depth of the second resonant blind hole 121 is 2.09 mm (± 0.01 mm), and the depths of the third resonant blind hole of the third resonator 13 and the fourth resonant blind hole of the fourth resonator 14 are both 1.68 mm (± 0.01 mm). The first resonant blind hole 111, the third resonant blind hole, the fourth resonant blind hole, and the sixth resonant blind hole are all designed at the center of gravity of the rectangular part of the semicircular rectangle, and the second resonant blind hole 121 and the fifth resonant blind hole are designed at the center of gravity of the rectangle. By adjusting their diameters and depths, the size of the resonator equivalent capacitance is changed, and the center frequency of the resonator can be flexibly controlled. The diameter of the first feeding blind hole 112 is 2 mm (± 0.01 mm) and the depth is 2 mm (± 0.01 mm).

[0035] like Figure 5 Strong magnetic coupling is achieved between the first resonator 11 and the second resonator 12, and between the sixth resonator 16 and the fifth resonator 15 respectively through an asymmetric coupling through hole and a connecting shallow blind slot 17. The coupling through holes are arranged on the inner side of the resonator to reduce unnecessary parasitic coupling. By changing the depth of the coupling blind hole, the size of the magnetic coupling can be controlled. Electromagnetic hybrid coupling is achieved between the third resonator 13 and the fourth resonator 14 through a deep coupling blind slot 19. By changing the depth of the blind slot, the coupling size between the resonators can be controlled. Cross-electric coupling is achieved between the second resonator 12 and the fifth resonator 15 through a deep coupling blind hole 22, which generates an out-of-band transmission zero point. By changing the depth of the blind hole, the size of the electrical coupling can be controlled, thereby changing the position of the transmission zero point.

[0036] There is magnetic coupling between the first resonator 11 and the second resonator 12, between the second resonator 12 and the third resonator 13, between the third resonator 13 and the fourth resonator 14, between the fourth resonator 14 and the fifth resonator 15, and between the fifth resonator 15 and the sixth resonator 16. There is electrical coupling between the second resonator 12 and the fifth resonator 15. Additional cross-electric coupling is generated between the first resonator 11 and the fifth resonator 15, and between the sixth resonator 16 and the second resonator 12, thereby suppressing the high-frequency transmission zero point and widening the high-frequency bandwidth. The parameter coupling coefficients of each resonator are as follows: the self-coupling coefficient is 0; m s1 =0.94, m L6 =m s1 , m 12 =0.78, m 56 =m 12 , m 23 =0.62, m 45 =m 23 , m 34 =0.65, m 25 =-0.06.

[0037] The whole-machine filtering performance test of the ceramic dielectric waveguide filter for S-band satellite communication of this embodiment is carried out, specifically, the S parameter test of the filter is carried out using a vector network analyzer, such as Figure 6 The ceramic dielectric waveguide filter for S-band satellite communication has a return loss greater than 20dB and an insertion loss less than 1.0dB when the bandwidth is between 3.6 and 4.1GHz. It generates a low-end transmission zero at the 3.5GHz frequency point, and the out-of-band suppression is greater than 40dB. The filter uses a ceramic dielectric with a dielectric constant of 20.5, and the overall physical size is (125π+360)×5mm 3 The test results show that the ceramic dielectric waveguide filter for S-band satellite communications has excellent performance and can meet the requirements of satellite communication systems.

[0038] Example 2

[0039] A communication device comprises the S-band satellite communication ceramic dielectric waveguide filter of embodiment 1.

Claims

1. A ceramic dielectric waveguide filter for S-band satellite communication, characterized in that: The dielectric waveguide (1) comprises a third resonator (13), a fourth resonator (14), and a first resonator (11), a second resonator (12), a fifth resonator (15), and a sixth resonator (16) arranged on the same horizontal line, wherein the third resonator (13) and the fourth resonator (14) are symmetrically arranged on the same side of the horizontal line; a connecting shallow blind groove (17) is arranged between the first resonator (11) and the second resonator (12); the fifth resonator (15) and the sixth resonator (16) are arranged on the same horizontal line; ) and the sixth resonator (16) are provided with a second connecting shallow blind slot (21) to achieve magnetic coupling; a first coupling shallow blind hole (18) is provided between the second resonator and the third resonator, and a second coupling shallow blind hole (20) is provided between the fourth resonator (14) and the fifth resonator (15) to achieve magnetic coupling; a deep coupling blind slot (19) is provided between the third resonator (13) and the fourth resonator (14); and a deep coupling blind hole (22) is provided between the second resonator (12) and the fifth resonator (15).

2. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: The resonant cavities of the first resonator (11), the third resonator (13), the fourth resonator (14), and the sixth resonator (16) are all semicircular resonant cavities, and the resonant cavities of the second resonator (12) and the fifth resonator (15) are all rectangular resonant cavities.

3. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: The first resonator (11) and the sixth resonator (16) have the same structure.

4. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 3, characterized in that: A first resonant blind hole (111) is arranged on the upper surface at the center of gravity of the first resonator (11), and a first feeding blind hole (112) is arranged on the lower surface; the diameter of the first feeding blind hole (111) is greater than the diameter of the first feeding blind hole (112).

5. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 4, characterized in that: A second resonant blind hole (121) is arranged on the upper surface at the center of gravity of the second resonator (12); the diameter and depth of the second resonant blind hole (121) are the same as those of the first resonant blind hole (111).

6. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: The third resonator (13), the fourth resonator (14), and the fifth resonator (15) have the same structure, and a third resonant blind hole is arranged on the upper surface at the center of gravity of the third resonator (13).

7. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: The connecting shallow blind groove 1 (17) has the same structure as the coupling shallow blind hole 2 (20). The connecting shallow blind groove 1 (17) comprises a cylindrical through hole (171) and a shallow rectangular groove (172). The rectangular groove (172) and the coupling shallow blind hole 1 (18) and the coupling shallow blind hole 2 (20) are arranged on the same side of the dielectric waveguide (1).

8. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: The deep coupling blind slot (19) comprises a rectangular through hole (191) and a deep rectangular slot (192); the deep rectangular slot (192) and the coupling shallow blind hole 1 (18) and the coupling shallow blind hole 2 (20) are arranged on the same side of the dielectric waveguide (1).

9. The ceramic dielectric waveguide filter for S-band satellite communication according to claim 1, characterized in that: Its coupling coefficient varies between -0.06 and 0.

94.

10. A communication device, characterized in that: It comprises a ceramic dielectric waveguide filter for S-band satellite communication as described in any one of claims 1 to 9.

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