A totally sealed ceramic dielectric filter

Abstract

The utility model relates to filter technical field, specifically disclose a kind of full-sealed ceramic dielectric filter, comprising: shell, the shell inside is equipped with dielectric resonator, the dielectric resonator two ends are respectively connected with input connector and output connector, the shell inside is fixedly provided with heat exchange plate, cooling mechanism is equipped on the heat exchange plate;The utility model is by the cover plate and shell of fixed welding and constitutes full-sealed structure, effectively insulates outside water vapor, salt fog and pollutant, ensure that internal dielectric resonator long-term stable work, significantly improve the reliability and service life of filter under harsh environment, simultaneously utilize the cooling mechanism of internal heat exchange plate and heat exchange pipe composition, combine external heat conduction plate and radiating fin, construct the high-efficiency multi-path heat dissipation system, can quickly export the heat generated when dielectric resonator works, prevent the frequency drift and performance decline due to temperature rise, guarantee the stability of filter under high power scene.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, specifically relating to a fully sealed ceramic dielectric filter. Background Technology

[0002] A filter is an electronic device that can filter out specific frequency components from complex electrical signals. Its function is similar to a "traffic cop," allowing signals in a designated frequency band to pass smoothly while effectively blocking or attenuating other unwanted frequency components. Filters are crucial in wireless communication systems, widely used in transmitters and receivers. During transmission, they purify signals, suppress out-of-band noise and spurious emissions, and prevent interference with other channels. During reception, they accurately select useful signals from numerous signals captured in the air, filtering out adjacent channel interference and noise. Based on frequency response characteristics, filters are mainly classified into low-pass, high-pass, band-pass, and band-stop types. Ceramic dielectric filters are a common type of band-pass filter. They utilize the electromagnetic resonance characteristics of ceramic materials with high dielectric constants. Due to their advantages such as low insertion loss, good frequency and temperature stability, and small size for easy circuit integration, they have become an indispensable core component in modern mobile communication equipment, especially 5G base stations.

[0003] In the field of mobile communication technology, ceramic dielectric filters are key components in the radio frequency front-end, and their performance directly determines signal selectivity and communication quality. With the large-scale commercialization of 5G mobile communication technology and future technological evolution, base station antennas are developing towards large-scale arraying and high integration. A single antenna unit needs to encapsulate dozens or even hundreds of filter channels, which places extremely stringent requirements on the size, weight, performance stability, and environmental reliability of the filters. Although traditional metal cavity filters have high power capacity, their large size and heavy weight make it difficult to meet the high-density integration requirements of modern communication equipment. Dielectric filters based on high dielectric constant ceramic materials, with their inherent advantages such as ease of miniaturization, lightweight design, and high Q value, are gradually becoming the mainstream choice in the industry.

[0004] However, existing ceramic dielectric filters still face severe challenges in terms of long-term reliability. The unsealed or semi-sealed structure makes the internal ceramic resonator and its metallized electrodes susceptible to corrosion from external moisture, salt spray and pollutants, leading to electrode oxidation, performance drift and even functional failure. Their service life in harsh outdoor environments cannot be guaranteed. Utility Model Content

[0005] The purpose of this invention is to provide a fully sealed ceramic dielectric filter that, while maintaining miniaturization and high performance, avoids corrosion from external contaminants and facilitates heat dissipation.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A fully sealed ceramic dielectric filter includes: a housing, a dielectric resonator disposed inside the housing, an input connector and an output connector respectively connected to both ends of the dielectric resonator, a heat exchange plate fixedly disposed inside the housing, a cooling mechanism disposed on the heat exchange plate, an opening at the top of the housing, a sealing component disposed at the opening, and two symmetrical clamping components disposed inside the housing;

[0008] The cooling mechanism includes a heat exchange tube disposed at the bottom of the heat exchange plate. The bottom of the heat exchange plate has a fixing groove adapted to the heat exchange tube. The heat exchange tube is fixedly disposed inside the fixing groove. Both ends of the heat exchange tube penetrate the shell and extend outward.

[0009] Preferably, a first connecting block is fixedly provided at the liquid inlet of the heat exchange tube, and a second connecting block is fixedly provided at the liquid outlet of the heat exchange tube. Both the first connecting block and the second connecting block have threaded grooves inside.

[0010] Preferably, a high thermal conductivity insulating pad is fixedly provided on the top of the heat exchange plate, and an installation groove is provided on the top of the high thermal conductivity insulating pad, and the bottom of the dielectric resonator is inserted into the installation groove.

[0011] Preferably, the sealing assembly includes a cover plate fixedly disposed at the opening, the cover plate and the top of the housing are fixedly connected by welding, a plurality of pressure rods are fixedly disposed at the bottom of the cover plate, the pressure rods are U-shaped, a rubber pad is fixedly disposed at the bottom of the pressure rod, and the bottom of the rubber pad is in tight contact with the top of the dielectric resonator.

[0012] Preferably, the clamping assembly includes a fixing plate fixedly disposed on the inner side wall of the housing, and a plurality of elastic clamping pieces are fixedly disposed on the outer side wall of the fixing plate. The plurality of elastic clamping pieces are all inclined and their outer side walls are in close contact with the outer side walls of the dielectric resonator.

[0013] Preferably, heat-conducting plates are fixedly provided on both outer walls of the housing, and multiple sets of heat dissipation fins are fixedly provided on the outer walls of the heat-conducting plates.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The welded cover plate and shell form a fully sealed structure, effectively isolating external moisture, salt spray and pollutants, ensuring the long-term stable operation of the internal dielectric resonator and significantly improving the reliability and service life of the filter in harsh environments. At the same time, the cooling mechanism composed of internal heat exchange plates and heat exchange tubes, combined with external heat conduction plates and heat dissipation fins, constructs a highly efficient multi-path heat dissipation system, which can quickly conduct and dissipate the heat generated by the dielectric resonator during operation, preventing frequency drift and performance degradation caused by temperature rise, and ensuring the stability of the filter in high-power scenarios. Attached Figure Description

[0016] Figure 1 This is one of the perspective views of this utility model;

[0017] Figure 2 This is a second perspective view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the shell in this utility model;

[0019] Figure 4 This is a schematic diagram of the sealing assembly in this utility model;

[0020] Figure 5 This is a schematic diagram of the connection structure between the heat exchange plate and the high thermal conductivity insulating pad in this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the heat exchange tube and heat exchange plate in this utility model;

[0022] In the diagram: 1. Housing; 2. Dielectric resonator; 3. Input connector; 4. Output connector; 5. Heat exchange plate; 6. High thermal conductivity insulating pad; 7. Mounting groove; 8. Heat exchange tube; 9. First connecting block; 10. Second connecting block; 11. Fixing groove; 12. Cover plate; 13. Pressure rod; 14. Rubber pad; 15. Fixing plate; 16. Elastic clamping piece; 17. Heat-conducting plate; 18. Heat dissipation fins. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] Please see Figure 1 - Figure 6As shown, a fully sealed ceramic dielectric filter includes: a housing 1, a dielectric resonator 2 inside the housing 1, an input connector 3 and an output connector 4 connected to both ends of the dielectric resonator 2 respectively, a heat exchange plate 5 fixedly installed inside the housing 1, a cooling mechanism on the heat exchange plate 5, an opening at the top of the housing 1, a sealing component at the opening, and two symmetrical clamping components inside the housing 1.

[0026] The cooling mechanism includes a heat exchange tube 8 disposed at the bottom of the heat exchange plate 5. A fixing groove 11 adapted to the heat exchange tube 8 is provided at the bottom of the heat exchange plate 5. The heat exchange tube 8 is fixedly disposed inside the fixing groove 11. Both ends of the heat exchange tube 8 penetrate the shell 1 and extend outward.

[0027] A first connecting block 9 is fixedly installed at the liquid inlet of the heat exchange tube 8, and a second connecting block 10 is fixedly installed at the liquid outlet of the heat exchange tube 8. Both the first connecting block 9 and the second connecting block 10 have threaded grooves inside.

[0028] A high thermal conductivity insulating pad 6 is fixedly installed on the top of the heat exchange plate 5. The top of the high thermal conductivity insulating pad 6 is provided with an installation groove 7, and the bottom of the medium resonator 2 is inserted into the installation groove 7.

[0029] Heat-conducting plates 17 are fixedly installed on both outer walls of the housing 1, and multiple sets of heat dissipation fins 18 are fixedly installed on the outer walls of the heat-conducting plates 17.

[0030] As can be seen from the above, this embodiment achieves full sealing protection by welding the shell 1 and the cover plate 12. The heat generated by the internal dielectric resonator 2 is quickly conducted to the heat exchange plate 5 through the high thermal conductivity insulating pad 6. The heat exchange tube 8 set at the bottom of the heat exchange plate 5 can be connected to the external circulating cooling system through the first connecting block 9 and the second connecting block 10 to form an active heat dissipation path.

[0031] Meanwhile, the heat-conducting plates 17 and multiple sets of heat dissipation fins 18 set on both sides of the housing 1 effectively increase the heat dissipation area and form a passive heat dissipation channel. This combination of active and passive heat dissipation ensures the stability of the working temperature of the dielectric resonator 2.

[0032] The bottom of the dielectric resonator 2 is accurately positioned by the mounting groove 7. With the help of the high thermal conductivity insulating pad 6, both precise positioning and efficient heat conduction are achieved. The input connector 3 and the output connector 4 are respectively set at both ends of the dielectric resonator 2 to complete the signal input and output functions.

[0033] Example 2:

[0034] Specifically, regarding the sealing assembly and clamping assembly mentioned above, the sealing assembly includes a cover plate 12 fixedly disposed at the opening, the cover plate 12 and the top of the housing 1 are fixedly connected by welding, a plurality of pressure rods 13 are fixedly disposed at the bottom of the cover plate 12, the pressure rods 13 are U-shaped, a rubber pad 14 is fixedly disposed at the bottom of the pressure rods 13, and the bottom of the rubber pad 14 is in tight contact with the top of the dielectric resonator 2.

[0035] The clamping assembly includes a fixing plate 15 fixedly disposed on the inner side wall of the housing 1. A plurality of elastic clamping pieces 16 are fixedly disposed on the outer side wall of the fixing plate 15. The plurality of elastic clamping pieces 16 are all inclined and their outer side walls are in close contact with the outer side walls of the dielectric resonator 2.

[0036] As can be seen from the above, this embodiment further optimizes the fixing structure based on the first embodiment. The multiple U-shaped pressure rods 13 set at the bottom of the cover plate 12 maintain elastic contact with the top of the dielectric resonator 2 through the bottom rubber pad 14, which not only provides appropriate clamping force to prevent the dielectric resonator 2 from loosening, but also prevents damage caused by rigid contact through the buffering effect of the rubber pad 14.

[0037] The fixing plate 15 and its multiple elastic clamping pieces 16 on the inner wall of the housing 1 are continuously pressed against the outer wall of the dielectric resonator 2 at an inclined angle, forming a symmetrical lateral clamping force. Together with the pressure bar 13 at the top, they form a three-dimensional fixing system, which effectively enhances the stability of the dielectric resonator 2 in the vibration environment.

[0038] This combination of top clamping and lateral clamping ensures mechanical fixation while avoiding thermal stress problems caused by excessive constraint, thus guaranteeing that the dielectric resonator 2 can maintain stable electrical performance when the temperature changes.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully sealed ceramic dielectric filter, characterized in that, include: The housing (1) has a dielectric resonator (2) inside, and an input connector (3) and an output connector (4) are connected to the two ends of the dielectric resonator (2) respectively. A heat exchange plate (5) is fixedly installed inside the housing (1), and a cooling mechanism is provided on the heat exchange plate (5). An opening is provided at the top of the housing (1), and a sealing component is provided at the opening. Two symmetrical clamping components are provided inside the housing (1). The cooling mechanism includes a heat exchange tube (8) disposed at the bottom of the heat exchange plate (5). The bottom of the heat exchange plate (5) is provided with a fixing groove (11) adapted to the heat exchange tube (8). The heat exchange tube (8) is fixedly disposed inside the fixing groove (11). Both ends of the heat exchange tube (8) penetrate the shell (1) and extend outward.

2. The fully sealed ceramic dielectric filter according to claim 1, characterized in that: The heat exchange tube (8) is fixedly provided with a first connecting block (9) at the liquid inlet and a second connecting block (10) at the liquid outlet. Both the first connecting block (9) and the second connecting block (10) have threaded grooves inside.

3. The fully sealed ceramic dielectric filter according to claim 1, characterized in that: A high thermal conductivity insulating pad (6) is fixedly installed on the top of the heat exchange plate (5). An installation groove (7) is opened on the top of the high thermal conductivity insulating pad (6). The bottom of the dielectric resonator (2) is inserted into the installation groove (7).

4. A fully sealed ceramic dielectric filter according to claim 1, characterized in that: The sealing assembly includes a cover plate (12) fixedly installed at the opening. The cover plate (12) and the top of the housing (1) are fixedly connected by welding. A plurality of pressure rods (13) are fixedly installed at the bottom of the cover plate (12). The pressure rods (13) are U-shaped. A rubber pad (14) is fixedly installed at the bottom of the pressure rods (13). The bottom of the rubber pad (14) and the top of the dielectric resonator (2) are in tight contact.

5. A fully sealed ceramic dielectric filter according to claim 1, characterized in that: The clamping assembly includes a fixing plate (15) fixedly disposed on the inner side wall of the housing (1), and a plurality of elastic clamping pieces (16) are fixedly disposed on the outer side wall of the fixing plate (15). The plurality of elastic clamping pieces (16) are all inclined and their outer side walls are in close contact with the outer side wall of the dielectric resonator (2).

6. A fully sealed ceramic dielectric filter according to claim 1, characterized in that: Heat-conducting plates (17) are fixedly installed on both outer walls of the housing (1), and multiple sets of heat dissipation fins (18) are fixedly installed on the outer walls of the heat-conducting plates (17).

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