CN112103601A

CN112103601A - Tuner with filter

Info

Publication number: CN112103601A
Application number: CN202011042633.0A
Authority: CN
Inventors: 陀思勇; 黄景民; 熊国际
Original assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2020-12-18
Also published as: WO2022062260A1

Abstract

The invention relates to the field of waveguide, coaxial cavity filter and tuner (LNB), and discloses a tuner with a filter, comprising: the tuner comprises a tuner body, a first switch and a second switch, wherein the tuner body is provided with a first shell, and a circuit board is arranged in the first shell; the waveguide filter and the tuner body are arranged back to back, the waveguide filter is provided with a second shell, and a filter cavity of the waveguide filter is formed in the second shell; the first shell and the second shell are integrally molded. The waveguide filter and the tuner body are integrally arranged back to back, so that the engineering installation steps are simplified, the problems of flange dislocation and contact gaps caused by cascade installation can be avoided, the performance index of a system is improved, the additional installation space of the waveguide filter is favorably reduced, and the situation that the waveguide filter cannot be adopted to inhibit 5G interference due to space limitation or even the adoption of the waveguide filter can be avoided for a satellite earth station adopting a feedback mode.

Description

Tuner with filter

Technical Field

The present invention relates to the field of waveguides, coaxial cavity filters, and tuners (LNBs), and more particularly to a tuner with a filter.

Background

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 working frequency of a tuner (low noise amplifier + frequency converter) of a C-band used by a satellite earth station is generally 3.4-4.2GHz, so that 5G signals (3.4-3.6GHz) can be received and amplified by the tuner, and the power of the tuner is easily saturated, so that the receiver cannot demodulate. The method can adopt comprehensive measures such as additionally arranging a waveguide filter for the earth station, isolating regions, additionally arranging a shielding net, reducing the transmitting power of the 5G base station, adjusting the maximum radiation direction of the antenna of the 5G base station and the like to relieve or eliminate interference, wherein the most economical and effective mode is to additionally arrange the waveguide filter between a feed source and a tuner to inhibit 5G signals in a 3.4-3.6GHz frequency band.

The waveguide filter is realized by adopting a metal coaxial cavity mode, the pass band is designed to be 3.7-4.2GHz, and the 5G signal is strongly inhibited while the low transmission loss is ensured. The input and output interfaces of the filter are waveguide standard flange interfaces, wherein the input interface is connected with the feed source, and the output interface is connected with the tuner.

By adopting the scheme, the waveguide filter and the high-frequency head are two independent modules, the operation requirement of engineering installation personnel for installing the waveguide filter is very high, two flange surfaces are required to be accurately aligned and installed (as shown in figure 1), and if the installation is staggered or a gap exists, poor system indexes and waterproof hidden dangers are easily caused. On the other hand, for the satellite earth station adopting the feedforward mode, the feed source and the high-frequency head are arranged at the focus of the parabolic antenna through the tripod, if the waveguide filter is additionally arranged on the basis, the supporting weight of the tripod must be increased, and meanwhile, the wind resistance surface is increased by too many devices, and the receiving of partial satellite signals can be shielded, so that the system performance and the safety are influenced. Particularly, under the dual polarization condition, two waveguide filters and two high frequency heads need to be installed on the bracket, so that the influence is more prominent. For satellite earth stations using the backfeed approach, waveguide filters often cannot even be installed because of space constraints.

The patent provides a waveguide filter and tuner integrated design scheme, which can well solve the problems.

Disclosure of Invention

The invention aims to overcome at least one defect (deficiency) of the prior art and provides a tuner with a filter, which is used for solving the technical problems that the 5G interference satellite earth station receiving and the waveguide filter are difficult to install and even cannot be installed.

The invention adopts the technical scheme that a tuner with a filter comprises

A tuner body having a first housing; and

the waveguide filter and the tuner body are arranged back to back, the waveguide filter is provided with a second shell, and a filter cavity of the waveguide filter is formed in the second shell;

the first shell and the second shell are integrally molded.

Compared with the separation scheme of the conventional filter and the tuner, the integrated design scheme has the advantages that the engineering installation steps are simplified, the problems of flange dislocation and contact gaps caused by cascade installation can be avoided, and the performance index of a system is improved. The waveguide filter and the tuner body are arranged back to back, so that the additional installation space of the waveguide filter is favorably reduced, and the situation that the waveguide filter cannot be adopted to inhibit 5G interference due to limited space or even the satellite earth station adopting a feedback mode can be avoided.

In order to ensure the strength of received signals, the first shell and the second shell are provided with a shared bottom plate, a circuit board is arranged in the first shell, the waveguide filter is provided with a port resonance column located in a filter cavity, the port resonance column is connected with the circuit board through a contact pin penetrating through the bottom plate, and the contact pin is in capacitive coupling with the port resonance column.

The waveguide filter can be realized by adopting a metal coaxial cavity mode, and the port resonant column in the filter cavity of the signal received by the waveguide filter is capacitively coupled to the contact pin electrically connected with the tuner circuit board through a cross coupling technology, so that the transmission of the signal from the waveguide filter to the tuner body is realized, the out-of-band rejection is easy to be made higher under the condition that the insertion loss of a pass band is required to be less than or equal to 0.5dB, the received 5G interference signal can be well rejected at the input end, the signal is prevented from entering a post-level receiver processing module, the 5G interference is eliminated, and the intensity of the received signal is favorably ensured. The port resonance column can be made of a metal material, the material is generally a copper material or a steel material, the surface of the port resonance column is subjected to silver plating, gold plating, zinc plating, tin plating, nickel plating, chromium plating and the like, and the port resonance column can also be made of graphite, carbon fiber, carbon black, activated carbon, diamond, graphene, carbon nano tube and derived inorganic non-metallic materials or high polymer materials, and the surface of the port resonance column is subjected to silver plating, copper, gold, zinc, tin, nickel, chromium and the like and alloys thereof, such as resonance columns disclosed in Chinese patent publication Nos. CN106654499A and CN 205603496U. The pins are generally wires with silver, gold or the like on the surface, and can also be metal wires of silver, gold or the like.

Since there is direct current passing through the junction 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 post can be realized by the following two schemes:

in the first scheme, a first sleeve is sleeved outside the port resonance column, a first insulating medium is arranged between the first sleeve and the port resonance column, and the first sleeve is electrically connected with a contact pin;

in a second scheme, a second sleeve is sleeved outside the contact pin, a second insulating medium is arranged between the second sleeve and the port resonance column, and the second sleeve is electrically connected with the port resonance column.

The first sleeve and/or the second sleeve can be made of metal materials with silver-plated surfaces, copper, gold, zinc, tin, nickel, chromium and the like. 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, the first insulating medium and/or the second insulating medium made of a solid material is preferably used, and more importantly, the solid first insulating medium and/or the solid second insulating medium plays a role in preventing direct current ground short circuit, and the solid material can be made of a polytetrafluoroethylene material or other insulating materials.

The position relation and the connection relation of the port resonance column and the contact pin are closely related to the port coupling bandwidth, the port coupling bandwidth can be adjusted according to the pass band bandwidths of waveguide filters of different models (the pass band of the waveguide filter described in the patent is 3700 MHz-4200 MHz, and the total bandwidth is 500 MHz), and the two schemes can be improved as follows in order to conveniently adjust the port coupling bandwidth.

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

Under the condition that the first sleeve and the contact pin are directly and electrically connected, the contact pin can be electrically connected with the first sleeve sleeved outside the port resonance column in a bending mode, and the connection position of the contact 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 resonating posts and the pins is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. the height of a bending point of the contact pin and/or the height (relative to the height of the bottom of the filter cavity) of the electrical connection (welding) between the contact pin and the port resonance column is increased, so that the port coupling bandwidth is widened, and conversely, the port coupling bandwidth is narrowed;

2. the diameter of the contact pin is increased, the port coupling bandwidth is widened, and conversely, the port coupling bandwidth is narrowed;

3. under the condition that the bending point height of the contact pin and the electric connection height of the contact pin and the port resonance column are not changed, the closer the port resonance column is to the contact pin, the wider the port coupling bandwidth is, and conversely, the more distant the port coupling bandwidth is, the narrower the port coupling bandwidth is.

Under the condition of electric connection between the first sleeve and the contact pin through a first tapped line, the connection position of the first tapped line and the contact 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 distance between the port resonating posts and the pins is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. the height (relative to the height of the bottom of the filter cavity) of the first tapped line and the pin and/or the first sleeve for electric connection (welding) is increased, and the bandwidth of the port coupling is widened, and is narrowed; increasing the length of the first sleeve does not effectively increase the port coupling bandwidth;

2. increasing the diameter of the first tapped line, widening the port coupling bandwidth, and conversely narrowing the port coupling bandwidth;

3. under the condition that the height of the first tapped line is unchanged, the closer the port resonant column is to the pin, the wider the port coupling bandwidth is, and conversely, the closer the port coupling bandwidth is to the far end.

For the second scheme, the second sleeve and the port resonance column are electrically connected through a second tap line, in this case, the connection position of the second tap line and the port resonance 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 distance between the port resonating posts and the pins is related to the coupling bandwidth. The port coupling bandwidth can be adjusted by:

1. the height (relative to the height of the bottom of the filter cavity) of the electrical connection (welding) of the second tap line and the port resonance column and/or the second sleeve is increased, the port coupling bandwidth is widened, and conversely, the port coupling bandwidth is narrowed;

2. increasing the diameter of the second tapped line, widening the port coupling bandwidth, and conversely narrowing the port coupling bandwidth;

3. under the condition that the height of the second tapped line is unchanged, the closer the port resonant column is to the contact pin, the wider the port coupling bandwidth is, and conversely, the narrower the port coupling bandwidth is at the farther end.

The first tap line and/or the second tap line are/is generally lines with silver, gold and the like on the surface, and can also be metal lines with silver, gold and the like, and the shape of the first tap line and/or the second tap line is not limited to a line form, and can also be a sheet form.

The contact pin is positioned in the waveguide filter through a supporting medium, and in order to prevent the contact pin from sliding up and down, the supporting medium is in interference fit with the contact pin.

According to the size of the diameter of the contact pin, the diameter of the supporting medium can be adjusted, so that the transmission impedance is 50 omega, the diameter of the supporting medium is convenient to adjust, the supporting medium is detachably connected with the bottom plate, the supporting medium is convenient to take down so as to change the diameter of the supporting medium through replacement, grinding and other modes, and the purpose of adjusting the transmission impedance is achieved. The bottom plate is provided with a limiting structure matched with the supporting medium, and the limiting structure is used for limiting the supporting medium. Specifically, the axial cross section of the supporting medium is of a convex structure, the supporting medium is installed through a mounting hole formed in the bottom plate, a limiting groove in a stepped structure is formed in the mounting hole, and the supporting medium can be prevented from sliding into the filtering cavity.

The contact pin assembling process is not only required to be accurately positioned and fixed, but also required to be electrically connected with the circuit board, so that the assembling operation is completed for the convenience of assembling work, the assembling efficiency is improved, the circuit board is provided with the small hole, and the contact pin penetrates through the small hole to be electrically connected with the circuit board. The diameter of the small hole is slightly larger than that of the contact pin, so that the contact pin can penetrate through the small hole from the middle, the circuit board is provided with a bonding pad, the contact pin and the circuit board are welded together through the bonding pad, and in this way, signals can be coupled to the tuner body on the back side from the waveguide filter.

The waveguide filter is realized by adopting a metal coaxial cavity mode, signals are transmitted in a sealed cavity, and the surface of the cavity can be subjected to silver plating treatment, so that the transmission loss is smaller, the bearable power capacity is larger, and the out-of-band rejection is easily made higher by combining a cross-coupling technology. The second shell is provided with a waveguide input port communicated with the filtering cavity, and the first shell is provided with an F-shaped output port electrically connected with the circuit board. Satellite signals are input from a waveguide input port, the conversion from waveguide to coaxial is completed at the port, then the signals are filtered through a metal coaxial cavity, the signals are connected with a circuit board in a tuner body in a capacitive coupling mode through a resonant column at the end port of a cavity filter, and finally the signals are output from an F-shaped output port electrically connected with 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 frequency band of 3.4-3.6GHz is more than or equal to 65dB, and the suppression degree for the frequency band of 4.8-4.9GHz is more than or equal to 80dB, so that the received 5G interference signal can be well suppressed at the input end, and the input end is prevented from entering a post-stage receiver processing module.

Compared with the prior art, the invention has the beneficial effects that:

1. the waveguide filter inhibits 5G signals of a 3.4-3.6GHz frequency band by more than 65dB, and can well eliminate the interference problem of a 5G base station to a satellite earth station. Meanwhile, the strength of the received signal is ensured by the smaller insertion loss of the waveguide filter.

2. The waveguide filter and the high-frequency head are integrally designed, so that the integral length of the waveguide filter and the high-frequency head is obviously shortened, and the integration level of the earth station is improved. The design method is not limited to the design of the C-band integrated tuner, and can be extended to the design of other bands of tuners such as Ku bands.

3. And devices on the parabolic antenna mounting bracket are reduced, the supporting weight of the mounting bracket is reduced, and the system reliability is improved. The reduction of the number of devices is beneficial to reducing the wind resistance coefficient and improving the stability and the safety of the system.

4. Compared with the separation scheme of the conventional filter and the tuner, the method simplifies the engineering installation steps, can avoid the problems of flange dislocation and contact gap in cascade installation, and improves the performance index of the system.

Drawings

Fig. 1 is a schematic diagram of a prior art waveguide filter and tuner separation scheme.

Fig. 2 is a schematic diagram of the structure of the tuner with filter.

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

Fig. 4 is a partial cross-sectional view of the tuner with filter according to embodiment 1.

Fig. 5 is a sectional view taken along line a-a in fig. 4.

Fig. 6 is an enlarged view of a portion B in fig. 5.

Fig. 7 is a partial sectional view of the tuner with filter according to embodiment 2.

Fig. 8 is a cross-sectional view C-C of 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 tuner with filter according to embodiment 3.

Fig. 11 is a cross-sectional view E-E of fig. 10.

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

Fig. 13 is a schematic view of a circuit board of embodiment 3.

Description of reference numerals: the tuner comprises a tuner body 100, a circuit board 110, a bonding pad 111, a shielding cover 120, an F-shaped output port 130, a waveguide filter 200, a port resonant column 210, a contact pin 220, a supporting medium 221, a first tap line 231, a second tap line 232, a first sleeve 241, a second sleeve 242, a filter cavity 250, a waveguide input port 260, a waterproof groove 261, a first insulating medium 271, a second insulating medium 272, a first shell 301, a second shell 302, a first waterproof cover plate 310, a second waterproof cover plate 320, a bottom plate 330 and a mounting hole 331.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

The embodiment provides a tuner with a filter, which is used for solving the technical problems that the 5G interference satellite earth station receiving is difficult to mount and the waveguide filter cannot be mounted. As shown in fig. 2 to 3, the tuner with filter adopts a double-sided layout manner as a whole, and includes a tuner body 100 and a waveguide filter 200 arranged back to back, the tuner body 100 has a first casing 301, the waveguide filter 200 has a second casing 302, the first casing 301 and the second casing 302 are integrally formed, a shared bottom plate 330 is provided between the first casing 100 and the second casing 302, the bottom plate 330 forms a double-sided layout interface, one side of the interface is the tuner body 100, and the other side is the waveguide filter 200.

The back-to-back means that the back surface of the tuner body 100 is attached to the back surface of the waveguide filter 200, and the two are back-to-back; for example, as shown in fig. 2, the back surface of the tuner main body 100 refers to the surface of the tuner main body 100 facing downward in fig. 2, and the back surface of the waveguide filter 200 refers to the surface of the waveguide filter 200 facing upward in fig. 2. It is understood that the directions in fig. 2 are merely for example 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 disposed in the first casing 301, and one side of the first casing 301 is provided with an F-shaped outlet electrically connected to the circuit board 110.

As shown in fig. 4-5, the waveguide filter 200 is implemented by using a metal coaxial cavity, the passband is designed to be 3.7-4.2GHz, the insertion loss in the passband is not more than 0.5dB, the suppression degree for the 3.4-3.6GHz band is not less than 65dB, and the suppression degree for the 4.8-4.9GHz band is not less than 80dB, so that the received 5G interference signal can be well suppressed at the input end, and the input into the post-receiver processing module is avoided.

As shown in fig. 6, the second housing 302 forms a filter chamber 250 of the waveguide filter 200 therein, and a waveguide input port 260 communicating with the filter chamber 250 is provided at one side of the second housing 302. The waveguide filter 200 is provided with a port resonance column 210 located in the filter cavity 250, the port resonance column 210 is connected with the circuit board 110 through a pin 220 penetrating through the bottom plate 330, and the pin 220 is capacitively coupled with the port resonance column 210. The port resonant post 210 may be made of a metal material, such as a copper material or a steel material, and the surface of the port resonant post is plated with silver, gold, zinc, tin, nickel, or chrome, or made of graphite, carbon fiber, carbon black, activated carbon, diamond, graphene, carbon nanotube, or an inorganic non-metallic material or a polymer material derived therefrom, or a surface of the port resonant post is plated with silver, copper, gold, zinc, tin, nickel, or chromium, or an alloy thereof, such as resonant posts disclosed in chinese patent publication nos. CN106654499A and CN 205603496U. The pins 220 are typically wires with silver or gold plated on the surface, and may also be metal wires.

The waveguide filter 200 is capacitively coupled to the tuner body 100, so that the pin 220 is prevented from being grounded due to the direct current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100. Specifically, a first sleeve 241 is sleeved outside the port resonant column 210, a first insulating medium 271 is arranged between the first sleeve 241 and the port resonant column 210, and the first sleeve 241 is electrically connected with the pin 220. Specifically, the pin 220 may be electrically connected to the first sleeve 241 sleeved outside the port resonant post 210 in a bending manner. The first sleeve 241 may be made of a metal material with a surface plated with silver, copper, gold, zinc, tin, nickel, chromium, or the like. 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 accurately position the first sleeve 241, the first insulating medium 271 is preferably made of a solid material, and more importantly, the solid first insulating medium 271 plays a role of preventing dc short circuit, and the solid material may be teflon or other insulating materials.

The position relation and the connection relation between the port resonance column 210 and the pin 220 are closely related to the port coupling bandwidth, and at this time, the connection position between the pin 220 and the first sleeve 241 is related to the coupling bandwidth; the diameter of the pin 220 is related to the coupling bandwidth; the distance between the port resonating bar 210 and the pin 220 is related to the coupling bandwidth. The port coupling bandwidth can be adjusted according to the passband bandwidths of the waveguide filters 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700 MHz-4200 MHz, and is 500MHz in total), and the specific changes are as follows:

1. increasing the height of the bending point of the pin 220 and/or the height (relative to the height of the bottom of the filter cavity 250) of the pin 220 electrically connected (welded) with the port resonance column 210, the port coupling bandwidth is widened, and conversely, the port coupling bandwidth is narrowed;

2. increasing the diameter of the pin 220 widens the port coupling bandwidth and conversely narrows it;

3. under the condition that the bending point height of the pin 220 and the electrical connection height of the pin 220 and the port resonance column 210 are unchanged, the closer the port resonance column 210 is to the pin 220, the wider the port coupling bandwidth is, and conversely, the narrower the port coupling bandwidth is, the farther the port coupling bandwidth is.

The pin 220 is positioned in the waveguide filter 200 through a support medium 221, and in order to prevent the pin 220 from sliding up and down, the support medium 221 and the pin 220 are in interference fit.

According to the diameter of the contact pin 220, the diameter of the supporting medium 221 can be adjusted, so that the transmission impedance is 50 Ω, and in order to conveniently adjust the diameter of the supporting medium 221, the supporting medium 221 is detachably connected with the bottom plate 330, so that the supporting medium 221 can be conveniently taken down to change the diameter thereof through replacement, grinding and the like, and the purpose of adjusting the transmission impedance is further achieved. The bottom plate 330 is provided with a limiting structure matched with the supporting medium 221, and the limiting structure is used for limiting the supporting medium 221. Specifically, the axial cross section of the supporting medium 221 is a "convex" structure, and the supporting medium 221 is installed through an installation hole 331 formed in the bottom plate 330, and a limit groove having a stepped structure is formed in the installation hole 331, so that the supporting medium 221 can be prevented from sliding down into the filter cavity 250.

The assembly process of the contact pin 220 not only needs to be accurately positioned and fixed, but also needs to be electrically connected with the circuit board 110, so that the assembly work is convenient, the assembly operation is completed, and the assembly efficiency is improved, the circuit board 110 is provided with a small hole, and the contact pin 220 penetrates through the small hole to be electrically connected with the circuit board 110. The pin 220 has a diameter slightly larger than that of the pin 220 so that the pin 220 passes through the middle, the land 111 is provided on the circuit board 110, and the pin 220 and the circuit board 110 are soldered together by the land 111, in such a manner that signals can be coupled from the waveguide filter 200 to the tuner body 100 on the rear side.

A first opening leading to the tuner body 100 is formed in the first shell 301 on one side of the interface, a second opening leading to the waveguide filter 200 is formed in the second shell 302 on the other side of the interface, the first opening is sealed by a first waterproof cover plate 310 and is subjected to waterproof treatment by using a rubber ring, and the second opening is sealed by a second waterproof cover plate 320 and is subjected to waterproof treatment by using a rubber ring; the F-shaped output port can be subjected to waterproof treatment through dispensing; the waveguide input port 260 can adopt a waveguide standard flange with a waterproof groove 261 (a waterproof rubber ring is arranged in the waterproof groove 261), and the integral waterproof grade of the tuner with the filter meets IP66, so that the tuner can be used in outdoor environment.

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

In the integrated design scheme of the waveguide filter 200 and the tuner provided by the embodiment, the waveguide filter 200 is implemented in a metal coaxial cavity manner, and the port resonant column 210 in the signal pass filtering wave cavity 250 received by the waveguide filter 200 is capacitively coupled to the contact pin 220 electrically connected to the tuner circuit board 110 by a cross coupling technology, so that the transmission of signals from the waveguide filter 200 to the tuner body 100 is realized, the out-of-band rejection is easily made higher under the condition that the insertion loss of a pass band is required to be less than or equal to 0.5dB, the received 5G interference signal can be well rejected at the input end, the entry into a post-stage receiver processing module is avoided, the 5G interference is eliminated, and the intensity of the received signals is ensured. The second shell 302 of the waveguide filter 200 and the first shell 301 of the tuner body 100 are integrally formed, and the filter cavity of the waveguide filter is formed by the inner space surrounded by the second shell. The waveguide filter 200 and the tuner body 100 are arranged back to back, which is beneficial to reducing the additional installation space of the waveguide filter 200, and can avoid the situation that the waveguide filter 200 can not be adopted to inhibit 5G interference even due to limited space for a satellite earth station adopting a feedback mode.

Example 2

As shown in fig. 7-8, the waveguide filter 200 is implemented by using a metal coaxial cavity, the passband is designed to be 3.7-4.2GHz, the insertion loss in the passband is not more than 0.5dB, the suppression degree for the 3.4-3.6GHz band is not less than 65dB, and the suppression degree for the 4.8-4.9GHz band is not less than 80dB, so that the received 5G interference signal can be well suppressed at the input end, and the input into the post-receiver processing module is avoided.

As shown in fig. 9, the second housing 302 forms a filter chamber 250 of the waveguide filter 200 therein, and a waveguide input port 260 communicating with the filter chamber 250 is provided at one side of the second housing 302. The waveguide filter 200 is provided with a port resonance column 210 located in the filter cavity 250, the port resonance column 210 is connected with the circuit board 110 through a pin 220 penetrating through the bottom plate 330, and the pin 220 is capacitively coupled with the port resonance column 210. The port resonant post 210 may be made of a metal material, such as a copper material or a steel material, and the surface of the port resonant post is plated with silver, gold, zinc, tin, nickel, or chrome, or made of graphite, carbon fiber, carbon black, activated carbon, diamond, graphene, carbon nanotube, or an inorganic non-metallic material or a polymer material derived therefrom, or a surface of the port resonant post is plated with silver, copper, gold, zinc, tin, nickel, or chromium, or an alloy thereof, such as resonant posts disclosed in chinese patent publication nos. CN106654499A and CN 205603496U. The pins 220 are typically wires with silver or gold plated on the surface, and may also be metal wires.

The waveguide filter 200 is capacitively coupled to the tuner body 100, so that the pin 220 is prevented from being grounded due to the direct current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100. Specifically, a first sleeve 241 is sleeved outside the port resonant column 210, a first insulating medium 271 is arranged between the first sleeve 241 and the port resonant column 210, and the first sleeve 241 is electrically connected with the pin 220. The first sleeve 241 is made of a metal material with a surface plated with silver, copper, gold, zinc, tin, nickel, chromium, or the like. 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 accurately position the first sleeve 241, the first insulating medium 271 is preferably made of a solid material, and more importantly, the solid first insulating medium 271 plays a role of preventing dc short circuit, and the solid material may be teflon or other insulating materials.

The position relationship and the connection relationship between the port resonant column 210 and the pin 220 are closely related to the port coupling bandwidth, the port coupling bandwidth can be adjusted according to the passband bandwidths of the waveguide filters 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700 MHz-4200 MHz, which is 500MHz in total), and in order to conveniently adjust the port coupling bandwidth, the first sleeve 241 is electrically connected to the pin 220 through the first tap line 231. Specifically, one end of the first tapped line 231 is welded to the pin 220, and the other end is welded to the first sleeve 241 or connected thereto by a screw. The first tap line 231 is generally a line with a silver or gold plated surface, or may be a metal line with silver or gold plated surface, and the shape of the first tap line is not limited to a line form, and may be a sheet form.

At this time, the connection position of the first tap line 231 with 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 distance between the port resonating bar 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 tapped line, and the specific change is as follows:

1. increasing the height (relative to the height of the bottom of the filter cavity 250) at which the first tap line 231 is electrically connected (soldered) to the pin 220 and/or the first sleeve 241 widens the port coupling bandwidth and conversely narrows; increasing the length of the first sleeve 241 does not effectively increase the port coupling bandwidth;

2. increasing the diameter of the first tap line 231, the port coupling bandwidth becomes wider, and conversely becomes narrower;

3. with the height of the first tap line 231 unchanged, the closer the port resonating column 210 is to the pin 220, the wider the port coupling bandwidth, and conversely, the narrower the port coupling bandwidth.

Example 3

As shown in fig. 3, the tuner body 100 mainly includes a circuit board 110 (see 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 disposed in the first casing 301, and an F-shaped outlet electrically connected to the circuit board 110 is disposed on one side of the first casing 301.

As shown in fig. 10 to 11, the waveguide filter 200 is implemented by using a metal coaxial cavity, the passband is designed to be 3.7 to 4.2GHz, the insertion loss in the passband is not more than 0.5dB, the suppression degree for the 3.4 to 3.6GHz band is not less than 65dB, and the suppression degree for the 4.8 to 4.9GHz band is not less than 80dB, so that the received 5G interference signal can be well suppressed at the input end, and the input into the post-receiver processing module is avoided.

As shown in fig. 12, the second housing 302 forms a filter chamber 250 of the waveguide filter 200 therein, and a waveguide input port 260 communicating with the filter chamber 250 is provided at one side of the second housing 302. The waveguide filter 200 is provided with a port resonance column 210 located in the filter cavity 250, the port resonance column 210 is connected with the circuit board 110 through a pin 220 penetrating through the bottom plate 330, and the pin 220 is capacitively coupled with the port resonance column 210. The port resonant post 210 may be made of a metal material, such as a copper material or a steel material, and the surface of the port resonant post is plated with silver, gold, zinc, tin, nickel, or chrome, or made of graphite, carbon fiber, carbon black, activated carbon, diamond, graphene, carbon nanotube, or an inorganic non-metallic material or a polymer material derived therefrom, or a surface of the port resonant post is plated with silver, copper, gold, zinc, tin, nickel, or chromium, or an alloy thereof, such as resonant posts disclosed in chinese patent publication nos. CN106654499A and CN 205603496U. The pins 220 are typically wires with silver or gold plated on the surface, and may also be metal wires.

The waveguide filter 200 is capacitively coupled to the tuner body 100, so that the pin 220 is prevented from being grounded due to the direct current passing through the connection between the circuit board 110 and the pin 220 in the tuner body 100. Specifically, the second sleeve 242 is sleeved outside the pin 220, and a second insulating medium 272 is disposed between the second sleeve 242 and the port resonant column 210, and the second sleeve 242 is electrically connected to the port resonant column 210. The second sleeve 242 is made of silver-plated metal material such as copper, gold, zinc, tin, nickel, chromium, etc. 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 achieve accurate positioning of the second sleeve 242, the second insulating medium 272 is preferably made of a solid material, and more importantly, the solid second insulating medium 272 serves to prevent dc short circuit, and the solid material may be teflon or other insulating materials.

The position relationship and the connection relationship between the port resonant post 210 and the contact pin 220 are closely related to the port coupling bandwidth, the port coupling bandwidth can be adjusted according to the passband bandwidths of the waveguide filters 200 of different models (the passband of the waveguide filter 200 described in this embodiment is 3700 MHz-4200 MHz, which is 500MHz in total), and in order to conveniently adjust the port coupling bandwidth, the second sleeve 242 is electrically connected to the port resonant post 210 through the second tap line 232. Specifically, one end of the second tapped line 232 is welded or screwed to the port resonating column 210, and the other end is welded or screwed to the second sleeve 242. The second tap line 232 is generally a line with a silver or gold plated surface, or may be a metal line with silver or gold plated surface, and the shape of the second tap line is not limited to a line form, and may also be a sheet form.

At this time, the connection position of the second tap line 232 with the port resonator 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; the distance between the port resonating bar 210 and the pin 220 is related to the coupling bandwidth. Adjusting the bonding position of the second tap line 232 can adjust the coupling bandwidth by the following specific changes:

1. increasing the height (relative to the height of the bottom of the filter cavity 250) at which the second tap line 232 is welded to the port resonating bar 210 and/or the second sleeve 242 widens the port coupling bandwidth and conversely narrows;

2. increasing the diameter of the second tap line 232 widens the port coupling bandwidth and, conversely, narrows;

3. with the height of the second tapped line 232 unchanged, the port coupling bandwidth is wider the closer the port resonating column 210 is to the pin 220, and conversely, the port coupling bandwidth is narrower the farther away.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. A tuner with a filter, comprising

A tuner body having a first housing; and

the first shell and the second shell are integrally molded.

2. The tuner with the filter as claimed in claim 1, wherein the first housing and the second housing have a common bottom plate, the first housing has a circuit board disposed therein, the waveguide filter has a port resonance column disposed in the filter cavity, the port resonance column is connected to the circuit board via a pin penetrating through the bottom plate, and the pin is capacitively coupled to the port resonance column.

3. The tuner with the filter as claimed in claim 2, wherein a first sleeve is sleeved outside the port resonant column, a first insulating medium is arranged between the first sleeve and the port resonant column, and the first sleeve is electrically connected with the contact pin;

or the contact pin is sleeved with a second sleeve, a second insulating medium is arranged between the second sleeve and the port resonance column, and the second sleeve is electrically connected with the port resonance column.

4. The tuner of claim 3, wherein the first sleeve is electrically connected to the pin through a first tap line.

5. The tuner with filter as claimed in 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.

6. The tuner of claim 3, wherein the second sleeve is electrically connected to the port resonator post via a second tap line.

7. The tuner of claim 6, wherein the connection position of the second tap line with the port resonator 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.

8. The tuner of claim 2, wherein the distance between the port resonator column and the pin is related to the coupling bandwidth.

9. The tuner of claim 2, wherein the pins are positioned on the base plate by a support medium.

10. The tuner of claim 9, wherein the support medium is an interference fit with the pin.

11. The tuner of claim 9, wherein the support medium is detachably connected to the base plate.

12. The tuner with filter as claimed in claim 9, wherein the base plate is provided with a position-limiting structure cooperating with the supporting medium.

13. The tuner with the filter as claimed in any one of claims 1 to 12, wherein the insertion loss in the pass band of the waveguide filter is not more than 0.5dB, the suppression degree for the 3.4-3.6GHz band is not less than 65dB, and the suppression degree for the 4.8-4.9GHz band is not less than 80 dB.