WO2022062260A1

WO2022062260A1 - Low-noise block having filter

Info

Publication number: WO2022062260A1
Application number: PCT/CN2020/141599
Authority: WO
Inventors: 陀思勇; 黄景民; 熊国际
Original assignee: 京信通信技术(广州)有限公司; 京信射频技术(广州)有限公司
Priority date: 2020-09-28
Filing date: 2020-12-30
Publication date: 2022-03-31
Also published as: CN112103601A

Abstract

The present invention relates to the field of waveguides, coaxial cavity filters, and low-noise blocks (LNBs). Disclosed is an LNB having a filter, comprising: an LNB body, the LNB body having a first housing, a circuit board being provided in the first housing; and a waveguide filter, the waveguide filter and the LNB body being arranged back to back, the waveguide filter having a second housing, a filtering cavity of the waveguide filter being formed inside the second housing. The first housing and the second housing are integrally formed. According to the present invention, the waveguide filter and the LNB body are integrally arranged back to back, such that engineering mounting steps are simplified, and problems of flange dislocation and a contact gap in cascaded mounting can be avoided, the system performance index is improved, and reduction of space for adding the waveguide filter is facilitated; for satellite earth stations that use a feedback mode, the situation in which 5G interference cannot even be suppressed by the waveguide filter due to the limited space can be avoided.

Description

A tuner with a filter

technical field

The present invention relates to the fields of waveguides, coaxial cavity filters and high-frequency heads (LNBs), and more particularly, to a high-frequency head with filters.

Background technique

3.4-3.6GHz and 4.8-4.9GHz are one of the planned frequency bands of the fifth generation mobile communication (5G), and the operating frequency of the C-band tuner (low noise amplifier + frequency converter) used by the satellite earth station is generally 3.4- 4.2GHz, so the 5G signal (3.4-3.6GHz) will also be received and amplified by the tuner, which can easily cause the power of the tuner to be saturated, making the receiver unable to demodulate. Comprehensive measures such as installing waveguide filters for earth stations, geographical isolation, installing shielding nets, reducing the transmit power of 5G base stations, and adjusting the maximum radiation direction of 5G base station antennas can be taken to alleviate or eliminate interference. A waveguide filter is installed between the tuner and the tuner to suppress 5G signals in the 3.4-3.6GHz frequency band.

The waveguide filter is implemented in a metal coaxial cavity, and the design passband is 3.7-4.2GHz, which can ensure low transmission loss and strong suppression of 5G signals. The input and output interfaces of the filter are all waveguide standard flange interfaces, in which the input port is connected to the feed source, and the output port is connected to the high-frequency head.

Adopting this solution, the waveguide filter and the tuner are two independent modules. The installation of the waveguide filter requires high operation requirements for the engineer and installer. It is required that the two flange surfaces must be precisely aligned and installed (as shown in Figure 1). , If the installation is misplaced or there are gaps, it is easy to cause poor system indicators and hidden dangers of waterproofing. On the other hand, for the satellite earth station using the feedforward method, the feed source and the tuner are installed at the focal point of the parabolic antenna through a tripod bracket. If a waveguide filter is added on this basis, the support weight of the tripod bracket will inevitably increase. At the same time, too many devices increase the wind resistance surface, and will block the reception of some satellite signals, affecting the performance and safety of the system. Especially in the case of dual polarization, two waveguide filters and two high-frequency heads need to be installed on the bracket, and the influence is more prominent. For satellite earth stations using the feed-back method, it is often impossible to install waveguide filters due to space constraints.

SUMMARY OF THE INVENTION

The present invention aims to overcome the above-mentioned defects of the prior art, and provides a high-frequency head with a filter, which is used to solve the technical problems that 5G interferes with satellite earth station reception, and the installation of waveguide filters is difficult or even impossible.

The technical solution adopted in the present invention is a high-frequency head with a filter, comprising:

a tuner body, the tuner body having a first housing; and

A waveguide filter, the waveguide filter and the tuner body are arranged back-to-back, the waveguide filter has a second casing, and a filter cavity of the waveguide filter is formed inside the second casing;

The first casing and the second casing are integrally formed.

The invention provides an integrated design scheme of a waveguide filter and a tuner. The second shell of the waveguide filter and the second shell of the tuner body are integrally formed, and the filter cavity of the waveguide filter is formed by the second shell. Compared with the conventional filter and high-frequency head separation scheme, it simplifies the engineering installation steps, can avoid the flange dislocation and contact gap problems in cascade installation, and improve the system performance index. The back-to-back arrangement of the waveguide filter and the tuner body is conducive to reducing the installation space of the waveguide filter. For satellite earth stations using the feed-back method, it can avoid the situation that the waveguide filter cannot be used to suppress 5G interference due to space constraints.

In order to ensure the strength of the received signal, the first casing and the second casing have a common bottom plate, the first casing is provided with a circuit board, and the waveguide filter is provided with a port resonance column located in the filter cavity. , the port resonant column and the circuit board are connected through pins pierced through the bottom plate, and the pin and the port resonant column are capacitively coupled.

In the present invention, the waveguide filter can be realized by a metal coaxial cavity, and through the cross-coupling technology, the signal received by the waveguide filter is capacitively coupled to the pin electrically connected to the high-frequency head circuit board through the port resonant column in the filter cavity. , so as to realize the transmission of the signal from the waveguide filter to the tuner body, so that in the case where the passband insertion loss is required to be ≤ 0.5dB, the out-of-band suppression is easy to be made relatively high, and the received signal can be well suppressed at the input end. The 5G interference signal can avoid entering the post-stage receiver processing module, which not only eliminates the 5G interference, but also helps to ensure the strength of the received signal. Among them, the port resonance column can be made of metal material, which is generally copper or steel. The surface is silver-plated, gold-plated, galvanized, tin-plated, nickel-plated, chrome-plated, etc. It can also be made of graphite, carbon fiber, carbon black, Activated carbon, diamond, graphene, carbon nanotubes and their derived inorganic non-metallic materials or polymer materials are processed, and the surface is plated with silver, copper, gold, zinc, tin, nickel, chromium, etc. and their alloys. For example, the publication number is Resonant columns disclosed in Chinese patents CN106654499A and CN205603496U. The pins are generally plated with silver, gold and other wires on the surface, and can also be metal wires such as silver and gold.

Because there is a DC current passing through the connection between the circuit board and the pin in the tuner body, it is necessary to ensure that the pin cannot be grounded, so the coupling of the signal between the waveguide filter and the tuner body must be capacitive coupling. Specifically, The capacitive coupling between the pin and the port resonant column can be achieved through the following two schemes:

In the first solution, a first sleeve is provided on the outer casing of the port resonant column, and a first insulating medium is arranged between the first sleeve and the port resonant column, and the first sleeve is electrically connected to the pin. connect;

In the second solution, the pin jacket is provided with a second sleeve, and a second insulating medium is provided between the second sleeve and the port resonant column, and the second sleeve resonates with the port Column electrical connection.

Wherein, the first sleeve and/or the second sleeve may be plated with silver, copper, gold, zinc, tin, nickel, chromium and other metal materials. The first insulating medium and/or the second insulating medium may be formed of a gas such as air, or may be made of a solid material. In order to enable the first sleeve and/or the second sleeve to be accurately positioned, it is preferable to use the first insulating medium and/or the second insulating medium made of solid materials, and more importantly, the solid first insulating medium and /or the second insulating medium plays the role of preventing DC grounding short circuit, and the solid material can be made of polytetrafluoroethylene or other insulating materials.

The positional relationship and connection relationship between the port resonant column and the pin are closely related to the port coupling bandwidth. According to the passband bandwidth of different types of waveguide filters (the passband of the waveguide filter described in this patent is 3700MHz to 4200MHz, a total of 500MHz bandwidth) to the port The coupling bandwidth is adjusted. In order to adjust the port coupling bandwidth conveniently, the above two schemes can be improved as follows.

For the first solution, the first sleeve and the pin may be directly electrically connected, or may be indirectly electrically connected through a first tap wire.

In the case of direct electrical connection between the first sleeve and the pin, the pin can be electrically connected to the first sleeve sleeved outside the port resonance column by bending, so The connection position of the pin and the first sleeve is related to the coupling bandwidth; the diameter of the pin is related to the coupling bandwidth; the distance between the port resonant column and the pin is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. Increase the height of the bending point of the pin and/or the height of the electrical connection (welding) between the pin and the port resonant column (relative to the height of the bottom of the filter cavity), the port coupling bandwidth becomes wider, and vice versa;

2. Increase the diameter of the pin, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the pin bending point and the height of the electrical connection between the pin and the port resonant column remain unchanged, the closer the port resonant column is to the pin, the wider the port coupling bandwidth, on the contrary, the farther the distance is, the narrower the port coupling bandwidth .

In the case where the first sleeve and the pin are electrically connected through a first tap wire, the connection position and coupling between the first tap line and the pin and/or the first sleeve The bandwidth is related; the diameter of the first tap line is related to the coupling bandwidth; the distance between the port resonant column and the pin is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. Increase the height of the electrical connection (welding) between the first tap line and the pin and/or the first sleeve (relative to the height of the bottom of the filter cavity), the port coupling bandwidth becomes wider, and vice versa. The length cannot effectively increase the port coupling bandwidth;

2. Increase the diameter of the first tap line, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the first tap line remains unchanged, the closer the port resonant column is to the pin, the wider the port coupling bandwidth, on the contrary, the farther the distance is, the narrower the port coupling bandwidth.

For the second solution, the second sleeve and the port resonant column are electrically connected through a second tap line. In this case, the second tap line is connected to the port resonant column and/or the The connection position of the second sleeve is related to the coupling bandwidth; the diameter of the second tap line is related to the coupling bandwidth; the distance between the port resonant column and the pin is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. Increase the height (relative to the height of the bottom of the filter cavity) where the second tap line is electrically connected (welded) to the port resonant column and/or the second sleeve, and the port coupling bandwidth becomes wider, and vice versa;

2. Increase the diameter of the second tap line, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the second tap line remains unchanged, the closer the port resonant column is to the pin, the wider the port coupling bandwidth, on the contrary, the farther the distance is, the narrower the port coupling bandwidth.

Wherein, the first tap line and/or the second tap line are generally plated with silver, gold, etc., and may also be metal lines such as silver or gold.

The pins are positioned in the waveguide filter through a support medium, and in order to prevent the pins from sliding up and down, the support medium and the pins are in an interference fit.

According to the diameter of the pin, the diameter of the support medium can be adjusted so that the transmission impedance is 50Ω. In order to facilitate the adjustment of the diameter of the support medium, the support medium is detachably connected to the bottom plate, so that the support medium can be easily removed for replacement, grinding and other methods to change its diameter to achieve the purpose of adjusting the transmission impedance. The bottom plate is provided with a limit structure matched with the support medium, and the limit structure is used to limit the support medium. Specifically, the axial cross-section of the support medium is a "convex" structure, which is installed through the mounting hole provided on the bottom plate, and the mounting hole is provided with a limit groove in a stepped structure, which can prevent the support medium from sliding into the filter cavity.

The pin assembly process must not only be accurately positioned and fixed, but also electrically connected to the circuit board. In order to facilitate the assembly work to complete the assembly operation and improve the assembly efficiency, the circuit board is provided with small holes, and the pins pass through the small holes and are connected to the circuit board. The circuit board is electrically connected. The diameter of the small hole is slightly larger than the diameter of the pin, so that the pin passes through the middle, and the pad is set on the circuit board, and the pin and the circuit board are soldered together through the pad. In this way, the signal can be coupled from the waveguide filter to the tuner body on the back.

The waveguide filter in the present invention is realized by a metal coaxial cavity, the signals are all transmitted in a sealed cavity, and the surface of the cavity can be silver-plated, so the transmission loss is smaller, and the power capacity that can withstand is larger. Combined with cross-coupling technology, out-of-band rejection is easy to do higher. The second casing is provided with a waveguide input port that communicates with the filter cavity, and the first casing is provided with an F-shaped output port that is electrically connected to the circuit board. The satellite signal is input from the input port of the waveguide, and the conversion from the waveguide to the coaxial is completed at the port, and then filtered by the metal coaxial cavity. connected to the circuit board, and finally output from the F-type output port that is electrically connected to the circuit board. The design passband of the waveguide filter is 3.7-4.2GHz, the insertion loss in the passband is less than or equal to 0.5dB, the suppression degree for the 3.4-3.6GHz frequency band is greater than or equal to 65dB, and the suppression degree for the 4.8-4.9GHz frequency band is greater than or equal to 80dB. It can effectively suppress the received 5G interference signal and avoid entering the post-stage receiver processing module.

Compared with the prior art, the beneficial effects of the present invention are:

1. The suppression of the 5G signal in the 3.4-3.6GHz frequency band by the waveguide filter is greater than 65dB, which can well eliminate the interference problem of the 5G base station to the satellite earth station. At the same time, the small insertion loss of the waveguide filter ensures the strength of the received signal.

2. The integrated design of the waveguide filter and the tuner significantly shortens the overall length of the waveguide filter and the tuner, and improves the integration of the earth station. This design method is not limited to the C-band integrated tuner design, and can be extended to the Ku-band and other tuner designs.

3. Reduce the components on the parabolic antenna mounting bracket, reduce the supporting weight of the mounting bracket, and help improve the system reliability. Reducing the number of components is beneficial to reduce the wind resistance coefficient and improve the system stability and safety.

4. Compared with the conventional filter and tuner separation scheme, the engineering installation steps are simplified, which can avoid the flange dislocation and contact gap problems in cascade installation, and improve the system performance index.

Description of drawings

FIG. 1 is a schematic structural diagram of a separation scheme of a waveguide filter and a high-frequency head in the prior art.

Figure 2 is a schematic diagram of the structure of a high-frequency head with a filter.

Figure 3 is an exploded view of a tuner with a filter.

FIG. 4 is a partial cross-sectional view of the high-frequency head with a filter in Embodiment 1. FIG.

FIG. 5 is an A-A sectional view in FIG. 4 .

FIG. 6 is an enlarged view of part B in FIG. 5 .

FIG. 7 is a partial cross-sectional view of the high-frequency head with a filter according to the second embodiment.

FIG. 8 is a C-C sectional view in FIG. 7 .

FIG. 9 is an enlarged view of a portion D in FIG. 8 .

FIG. 10 is a partial cross-sectional view of the high-frequency head with a filter according to the third embodiment.

FIG. 11 is an E-E sectional view in FIG. 10 .

Fig. 12 is an enlarged view of the portion F in Fig. 11 .

FIG. 13 is a schematic diagram of the circuit board of Example 3. FIG.

Reference numeral description: tuner body 100, circuit board 110, pad 111, shield 120, F-shaped output port 130, waveguide filter 200, port resonance column 210, pin 220, support medium 221, first tap Line 231, second tap line 232, first sleeve 241, second sleeve 242, filter cavity 250, waveguide input port 260, waterproof groove 261, first insulating medium 271, second insulating medium 272, first housing 301 , the second casing 302 , the first waterproof cover 310 , the second waterproof cover 320 , the bottom plate 330 , and the mounting hole 331 .

detailed description

Example 1

This embodiment provides a high-frequency head with a filter, which is used to solve the technical problems that 5G interferes with satellite earth station reception, and the installation of the waveguide filter is difficult or even impossible. As shown in FIGS. 2 to 3 , the tuner with filter adopts a double-sided layout as a whole, including a tuner body 100 and a waveguide filter 200 arranged back to back, and the tuner body 100 has a first housing 301 , the waveguide filter 200 has a second casing 302, the first casing 301 and the second casing 302 are integrally formed, and there is a common bottom plate 330 between them, the bottom plate 330 forms an interface with a double-sided layout, and the interface One side is the tuner body 100, and the other side is the waveguide filter 200.

Among them, back-to-back refers to the backside of the tuner body 100 and the backside of the waveguide filter 200 that fit together, and the two are backrests for each other; for example, as shown in FIG. 2 , the back of the tuner body 100 refers to the tuner body in FIG. 2 . The surface of the waveguide filter 200 facing downward, and the back surface of the waveguide filter 200 refers to the surface of the waveguide filter 200 facing upward in FIG. 2 . It can be understood that the directions in FIG. 2 are only used as examples, and do not limit the scope of the present embodiment.

As shown in FIG. 3 , the tuner body 100 mainly includes a circuit board 110 positioned and connected to the bottom plate 330 and a shielding cover 120 covering the circuit board 110 . The circuit board 110 and the shielding cover 120 are both arranged in the first housing 301 , One side of the first housing 301 is provided with an F-shaped output port that is electrically connected to the circuit board 110 .

As shown in Figs. 4 to 5, the waveguide filter 200 is implemented by a metal coaxial cavity. The designed passband is 3.7-4.2GHz, the insertion loss in the passband is less than or equal to 0.5dB, and the suppression degree for the 3.4-3.6GHz frequency band is greater than or equal to 65dB. For the 4.8-4.9GHz frequency band, the suppression degree is ≥80dB, and the received 5G interference signal can be well suppressed at the input end to avoid entering the post-stage receiver processing module.

As shown in FIG. 6 , a filter cavity 250 of the waveguide filter 200 is formed inside the second housing 302 , and a waveguide input port 260 communicating with the filter cavity 250 is provided on one side of the second housing 302 . The waveguide filter 200 is provided with a port resonant column 210 located in the filter cavity 250 . The port resonant column 210 is connected to the circuit board 110 through a pin 220 pierced through the bottom plate 330 , and the pin 220 and the port resonant column 210 are connected. capacitive coupling. The port resonant column 210 can be made of metal material, which is generally copper or steel, and the surface is silver-plated, gold-plated, galvanized, tin-plated, nickel-plated, chrome-plated, etc. It can also be made of graphite, carbon fiber, carbon Black, activated carbon, diamond, graphene, carbon nanotubes and their derived inorganic non-metallic materials or polymer materials are processed, and the surface is plated with silver, copper, gold, zinc, tin, nickel, chromium, etc. and their alloys. For example, disclosed Resonant columns disclosed in Chinese patents with numbers CN106654499A and CN205603496U. The pin 220 is generally a wire plated with silver or gold on the surface, and may also be a metal wire such as silver or gold.

The waveguide filter 200 and the tuner body 100 are capacitively coupled, so that the pin 220 can be prevented from being grounded due to a DC current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100 . Specifically, the port resonant column 210 is covered with a first sleeve 241 , and a first insulating medium 271 is disposed between the first sleeve 241 and the port resonator column 210 , and the first sleeve 241 is electrically connected to the pin 220 . Specifically, the pin 220 can be electrically connected to the first sleeve 241 sleeved outside the port resonance column 210 by bending. Wherein, the first sleeve 241 may be a metal material such as silver, copper, gold, zinc, tin, nickel, and chromium plated on the surface. The first insulating medium 271 may be formed of a gas such as air, or may be made of a solid material. In order to enable the first sleeve 241 to be accurately positioned, it is preferable to use the first insulating medium 271 made of solid material. More importantly, the solid first insulating medium 271 plays a role in preventing DC grounding short circuit. Teflon material or other insulating materials can be used.

The positional relationship and connection relationship between the port resonance column 210 and the pin 220 are closely related to the port coupling bandwidth. At this time, the connection position of the pin 220 and the first sleeve 241 is related to the coupling bandwidth; The diameter is related to the coupling bandwidth; the distance between the port resonant post 210 and the pin 220 is related to the coupling bandwidth. The port coupling bandwidth can be adjusted according to the passband bandwidth of the waveguide filter 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700MHz to 4200MHz, with a total bandwidth of 500MHz). The specific changes are:

1. Increasing the height of the bending point of the pin 220 and/or the height of the electrical connection (welding) between the pin 220 and the port resonant column 210 (relative to the height of the bottom of the filter cavity 250), the port coupling bandwidth becomes wider, and vice versa;

2. Increase the diameter of the pin 220, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the bending point of the pin 220 and the height of the electrical connection between the pin 220 and the port resonant column 210 remain unchanged, the closer the port resonant column 210 is to the pin 220, the wider the port coupling bandwidth, on the contrary, the farther the distance is. The port coupling bandwidth is narrower.

The pins 220 are positioned in the waveguide filter 200 through the supporting medium 221 . To prevent the pins 220 from sliding up and down, the supporting medium 221 and the pins 220 are in an interference fit.

According to the diameter of the pin 220, the diameter of the support medium 221 can be adjusted so that the transmission impedance is 50Ω. In order to facilitate the adjustment of the diameter of the support medium 221, the support medium 221 is detachably connected to the bottom plate 330 to facilitate the removal of the support medium 221. To change its diameter by replacement, grinding, etc., to achieve the purpose of adjusting the transmission impedance. The bottom plate 330 is provided with a limit structure matched with the support medium 221 , and the limit structure is used to limit the support medium 221 . Specifically, the axial section of the support medium 221 is a “convex” character structure, which is installed through the installation holes 331 provided on the bottom plate 330 . inside the filter cavity 250 .

The assembly process of the pin 220 should not only be accurately positioned and fixed, but also be electrically connected to the circuit board 110. In order to facilitate the assembly work to complete the assembly operation and improve the assembly efficiency, the circuit board 110 is provided with a small hole, and the pin 220 passes through it. The via holes are electrically connected to the circuit board 110 . The diameter of the small hole is slightly larger than the diameter of the pin 220, so that the pin 220 passes through the middle, the pad 111 is provided on the circuit board 110, and the pin 220 and the circuit board 110 are welded together through the pad 111. In this way, Signals can be coupled from the waveguide filter 200 to the backside tuner body 100 .

The first casing 301 on one side of the interface is provided with a first opening leading to the tuner body 100 , and the second casing 302 on the other side of the interface is provided with a second opening leading to the waveguide filter 200 . The opening is sealed by the first waterproof cover plate 310 and waterproofed with a rubber ring, the second opening is sealed by the second waterproof cover plate 320 and waterproofed with a rubber ring; the F-type output port can be waterproofed by dispensing glue; the waveguide input port 260 The standard flange with waterproof groove 261 waveguide can be used (waterproof rubber ring is placed in the waterproof groove 261). The overall waterproof level of the tuner with filter meets IP66, which can meet the outdoor environment.

In this embodiment, the satellite signal is input through the waveguide input port 260 , and the waveguide to coaxial conversion is completed at the port, and then filtered by the metal coaxial cavity, and the signal passes through the port resonant column 210 of the waveguide filter 200 and the tuner. The circuit board 110 in the body 100 is connected, and finally output from the F-type output port that is electrically connected to the circuit board.

In the integrated design solution of the waveguide filter 200 and the tuner provided in this embodiment, the waveguide filter 200 is realized by a metal coaxial cavity, and the signal received by the waveguide filter 200 is passed through the filter cavity 250 through the cross-coupling technology. The port resonant column 210 is capacitively coupled to the pin 220 electrically connected to the tuner circuit board 110, so as to realize the transmission of the signal from the waveguide filter 200 to the tuner body 100, so that when the passband insertion loss is required to be less than or equal to 0.5dB It is easy to achieve high out-of-band suppression, which can well suppress the received 5G interference signal at the input end, and avoid entering the post-receiver processing module, which not only eliminates 5G interference, but also helps to ensure the received signal. strength. The second casing 302 of the waveguide filter 200 is integrally formed with the first casing 301 of the tuner body 100, and the filter cavity of the waveguide filter is formed by the inner space surrounded by the second casing, which is different from the conventional filter and the high-frequency filter. Compared with the frequency head separation scheme, the engineering installation steps are simplified, the flange dislocation and contact gap problems in cascade installation can be avoided, and the system performance index can be improved. The waveguide filter 200 and the tuner body 100 are arranged back-to-back, which is beneficial to reduce the installation space of the waveguide filter 200. For the satellite earth station adopting the feed-back method, it can avoid that the waveguide filter 200 cannot be used to suppress 5G due to space constraints. interference situation.

Example 2

As shown in Figures 7 to 8, the waveguide filter 200 is implemented by a metal coaxial cavity, the design passband is 3.7-4.2GHz, the insertion loss in the passband is ≤0.5dB, and the suppression degree for the 3.4-3.6GHz frequency band is ≥65dB. For the 4.8-4.9GHz frequency band, the suppression degree is ≥80dB, and the received 5G interference signal can be well suppressed at the input end to avoid entering the post-stage receiver processing module.

As shown in FIG. 9 , a filter cavity 250 of the waveguide filter 200 is formed inside the second housing 302 , and a waveguide input port 260 communicating with the filter cavity 250 is provided on one side of the second housing 302 . The waveguide filter 200 is provided with a port resonant column 210 located in the filter cavity 250 . The port resonant column 210 is connected to the circuit board 110 through a pin 220 pierced through the bottom plate 330 , and the pin 220 and the port resonant column 210 are connected. capacitive coupling. The port resonant column 210 can be made of metal material, which is generally copper or steel, and the surface is silver-plated, gold-plated, galvanized, tin-plated, nickel-plated, chrome-plated, etc. It can also be made of graphite, carbon fiber, carbon Black, activated carbon, diamond, graphene, carbon nanotubes and their derived inorganic non-metallic materials or polymer materials are processed, and the surface is plated with silver, copper, gold, zinc, tin, nickel, chromium, etc. and their alloys. For example, disclosed Resonant columns disclosed in Chinese patents with numbers CN106654499A and CN205603496U. The pin 220 is generally a wire plated with silver or gold on the surface, and may also be a metal wire such as silver or gold.

The waveguide filter 200 and the tuner body 100 are capacitively coupled, so that the pin 220 can be prevented from being grounded due to a DC current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100 . Specifically, the port resonant column 210 is covered with a first sleeve 241 , and a first insulating medium 271 is disposed between the first sleeve 241 and the port resonator column 210 , and the first sleeve 241 is electrically connected to the pin 220 . The first sleeve 241 is made of a metal material such as silver, copper, gold, zinc, tin, nickel, and chromium plated on the surface. The first insulating medium 271 may be formed of a gas such as air, or may be made of a solid material. In order to enable the first sleeve 241 to be accurately positioned, it is preferable to use the first insulating medium 271 made of solid material. More importantly, the solid first insulating medium 271 plays a role in preventing DC grounding short circuit. Teflon material or other insulating materials can be used.

The positional relationship and connection relationship between the port resonant column 210 and the pin 220 are closely related to the port coupling bandwidth, which can be determined according to the passband bandwidth of the waveguide filter 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700 MHz to 4200 MHz, a total of 500MHz bandwidth) to adjust the port coupling bandwidth. In order to adjust the port coupling bandwidth conveniently, the first sleeve 241 and the pin 220 are electrically connected through the first tap line 231 . Specifically, one end of the first tap wire 231 is welded with the pin 220 , and the other end is welded with the first sleeve 241 or connected by screws. The first tap wire 231 is generally a wire plated with silver, gold, etc. on the surface, and may also be a metal wire such as silver or gold.

At this time, the connection position of the first tap line 231 and the pin 220 and/or the first sleeve 241 is related to the coupling bandwidth; the diameter of the first tap line 231 is related to the coupling bandwidth; the The distance between the port resonant post 210 and the pin 220 is related to the coupling bandwidth. The coupling bandwidth can be adjusted by adjusting the welding position of the second tap line. The specific changes are:

1. Increase the height (relative to the height of the bottom of the filter cavity 250) where the first tap wire 231 is electrically connected (welded) to the pin 220 and/or the first sleeve 241, and the port coupling bandwidth becomes wider, and vice versa; The length of a sleeve 241 cannot effectively increase the port coupling bandwidth;

2. By increasing the diameter of the first tap line 231, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the first tap line 231 is constant, the closer the port resonant column 210 is to the pin 220, the wider the port coupling bandwidth, on the contrary, the farther the distance is, the narrower the port coupling bandwidth.

The assembly process of the pin 220 should not only be accurately positioned and fixed, but also be electrically connected to the circuit board 110. In order to facilitate the assembly work to complete the assembly operation and improve the assembly efficiency, the circuit board 110 is provided with a small hole, and the pin 220 passes through it. The via holes are electrically connected to the circuit board 110 . The diameter of the small hole is slightly larger than the diameter of the pin 220, so that the pin 220 passes through the middle, the pad 111 is set on the circuit board 110, and the pin 220 and the circuit board 110 are welded together through the pad 111. In this way, The signal can be coupled from the waveguide filter 200 to the backside tuner body 100 .

In the integrated design solution of the waveguide filter 200 and the tuner provided in this embodiment, the waveguide filter 200 is realized by a metal coaxial cavity, and the signal received by the waveguide filter 200 is passed through the filter cavity 250 through the cross-coupling technology. The port resonant column 210 is capacitively coupled to the pin 220 electrically connected to the tuner circuit board 110, so as to realize the transmission of the signal from the waveguide filter 200 to the tuner body 100, so that when the passband insertion loss is required to be less than or equal to 0.5dB It is easy to achieve high out-of-band suppression, which can well suppress the received 5G interference signal at the input end, and avoid entering the post-receiver processing module, which not only eliminates 5G interference, but also helps to ensure the received signal. strength. The second casing 302 of the waveguide filter 200 is integrally formed with the first casing 301 of the tuner body 100, and the filter cavity of the waveguide filter is formed by the inner space surrounded by the second casing, which is different from the conventional filter and the high-frequency filter. Compared with the frequency head separation scheme, the engineering installation steps are simplified, the flange dislocation and contact gap problems caused by cascade installation can be avoided, and the system performance index can be improved. The waveguide filter 200 and the tuner body 100 are arranged back-to-back, which is beneficial to reduce the installation space of the waveguide filter 200. For the satellite earth station adopting the feed-back method, it can avoid that the waveguide filter 200 cannot be used to suppress 5G due to space constraints. interference situation.

Example 3

As shown in FIG. 3 , the tuner body 100 mainly includes a circuit board 110 (as shown in FIG. 13 ) positioned and connected to the bottom plate 330 and a shielding cover 120 covering the circuit board 110 . The circuit board 110 and the shielding cover 120 are both arranged on the first In the casing 301 , one side of the first casing 301 is provided with an F-type output port that is electrically connected to the circuit board 110 .

As shown in Figs. 10-11, the waveguide filter 200 is realized by a metal coaxial cavity, the designed passband is 3.7-4.2GHz, the insertion loss in the passband is ≤0.5dB, and the suppression degree for the 3.4-3.6GHz frequency band is ≥65dB. For the 4.8-4.9GHz frequency band, the suppression degree is ≥80dB, and the received 5G interference signal can be well suppressed at the input end to avoid entering the post-stage receiver processing module.

As shown in FIG. 12 , a filter cavity 250 of the waveguide filter 200 is formed inside the second housing 302 , and a waveguide input port 260 communicating with the filter cavity 250 is provided on one side of the second housing 302 . The waveguide filter 200 is provided with a port resonant column 210 located in the filter cavity 250 . The port resonant column 210 is connected to the circuit board 110 through a pin 220 pierced through the bottom plate 330 , and the pin 220 and the port resonant column 210 are connected. capacitive coupling. The port resonant column 210 can be made of metal material, which is generally copper or steel, and the surface is silver-plated, gold-plated, galvanized, tin-plated, nickel-plated, chrome-plated, etc. It can also be made of graphite, carbon fiber, carbon Black, activated carbon, diamond, graphene, carbon nanotubes and their derived inorganic non-metallic materials or polymer materials are processed, and the surface is plated with silver, copper, gold, zinc, tin, nickel, chromium, etc. and their alloys. For example, disclosed Resonant columns disclosed in Chinese patents with numbers CN106654499A and CN205603496U. The pin 220 is generally a wire plated with silver or gold on the surface, and may also be a metal wire such as silver or gold.

The waveguide filter 200 and the tuner body 100 are capacitively coupled, so that the pin 220 can be prevented from being grounded due to a DC current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100 . Specifically, a second sleeve 242 is disposed on the outer cover of the pin 220 , and a second insulating medium 272 is disposed between the second sleeve 242 and the port resonance column 210 , and the second sleeve 242 is electrically connected to the port resonance column 210 . The second sleeve 242 is made of a surface, copper, gold, zinc, tin, nickel, chromium and other silver-plated metal materials. The second insulating medium 272 may be formed of a gas such as air, or may be made of a solid material. In order to enable the second sleeve 242 to be accurately positioned, the second insulating medium 272 made of solid material is preferably used. More importantly, the solid second insulating medium 272 plays a role in preventing DC grounding short-circuits. Teflon material or other insulating materials can be used.

The positional relationship and connection relationship between the port resonant column 210 and the pin 220 are closely related to the port coupling bandwidth. According to the passband bandwidth of the waveguide filter 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700 MHz to 4200 MHz, A total of 500MHz bandwidth) is used to adjust the port coupling bandwidth. To facilitate adjusting the port coupling bandwidth, the second sleeve 242 and the port resonant column 210 are electrically connected through a second tap line 232 . Specifically, one end of the second tap wire 232 is welded or screwed to the port resonance column 210 , and the other end is welded or screwed to the second sleeve 242 . Wherein, the second tap wire 232 is generally a wire plated with silver or gold on the surface, and may also be a metal wire such as silver or gold.

At this time, the connection position of the second tap line 232 and the port resonant column 210 and/or the second sleeve 242 is related to the coupling bandwidth; the diameter of the second tap line 232 is related to the coupling bandwidth; so The distance between the port resonant column 210 and the pin 220 is related to the coupling bandwidth. The coupling bandwidth can be adjusted by adjusting the welding position of the second tap line 232, and the specific changes are:

1. Increasing the welding height (relative to the height of the bottom of the filter cavity 250) between the second tap line 232 and the port resonant column 210 and/or the second sleeve 242, the port coupling bandwidth becomes wider, and vice versa;

2. By increasing the diameter of the second tap line 232, the port coupling bandwidth becomes wider, and vice versa;

3. Under the condition that the height of the second tap line 232 is constant, the closer the port resonant column 210 is to the pin 220, the wider the port coupling bandwidth, on the contrary, the farther the distance is, the narrower the port coupling bandwidth is.

Claims

A high-frequency head with a filter, characterized in that it includes

a tuner body, the tuner body having a first housing; and

A waveguide filter, the waveguide filter and the tuner body are arranged back-to-back, the waveguide filter has a second casing, and a filter cavity of the waveguide filter is formed inside the second casing;

The first casing and the second casing are integrally formed.
The tuner with filter according to claim 1, wherein the first shell and the second shell have a common bottom plate, and the first shell is provided with a circuit board, The waveguide filter is provided with a port resonance column located in the filter cavity, the port resonance column is connected with the circuit board through a pin pierced through the bottom plate, and the pin resonates with the port Capacitive coupling between columns.
The tuner with a filter according to claim 2, wherein a first sleeve is provided on the outer casing of the port resonant column, and a space between the first sleeve and the port resonant column is A first insulating medium is provided, and the first sleeve is electrically connected to the pin;

Alternatively, a second sleeve is provided on the pin jacket, and a second insulating medium is provided between the second sleeve and the port resonant column, and the second sleeve is electrically connected to the port resonant column .
The high-frequency head with a filter according to claim 3, wherein the first sleeve and the pin are electrically connected through a first tap line;
The high-frequency head with a filter according to claim 4, wherein the connection position of the first tap line and the pin and/or the first sleeve is related to the coupling bandwidth; The diameter of the first tap line is related to the coupling bandwidth.
The tuner with a filter according to claim 3, wherein the second sleeve and the port resonance column are electrically connected through a second tap line.
The tuner with a filter according to claim 6, wherein the connection position of the second tap line and the port resonant column and/or the second sleeve is related to the coupling bandwidth ; the diameter of the second tap line is related to the coupling bandwidth.
The high-frequency head with a filter according to claim 2, wherein the distance between the port resonant column and the pin is related to the coupling bandwidth.
The high-frequency head with a filter according to claim 2, wherein the pin is positioned on the base plate through a supporting medium.
The high-frequency head with a filter according to claim 9, characterized in that, the support medium and the pins are in an interference fit.
The high-frequency head with a filter according to claim 9, wherein the support medium is detachably connected to the bottom plate.
The high-frequency head with a filter according to claim 9, characterized in that, the bottom plate is provided with a limit structure that cooperates with the support medium.
The tuner with a filter according to any one of claims 1 to 12, wherein the insertion loss in the passband of the waveguide filter is ≤ 0.5dB, and the degree of suppression in the 3.4-3.6GHz frequency band is ≥65dB, the suppression degree of 4.8-4.9GHz frequency band is ≥80dB.