A filter for suppressing 5G signal interference and a TV antenna

Abstract

The present invention relates to the technical field of antenna equipment, and discloses a filter for suppressing 5G signal interference, which includes a high-frequency filtering circuit with a coil suspended in a conductive isolation cavity as an inductor and the combination of the conductive isolation cavity, the dielectric therein and the coil as a capacitor. A novel filtering circuit is provided, which includes a conductive isolation cavity, the dielectric therein and a coil suspended in the conductive isolation cavity. The coil itself is the inductor of the high-frequency filtering circuit. The coil also forms two conductors close to each other with the conductive isolation cavity, and the air dielectric in the smaller space between the two forms a non-conductive insulating dielectric, jointly constituting a novel capacitor. In short, in the high-frequency filtering circuit, the coil is both an inductor and a conductor constituting the capacitor. The high-frequency filtering circuit has an effect significantly superior to that of a common LC filtering circuit in suppressing frequencies above 700 MHz, and the volume of the conductive isolation cavity constituting the capacitor is much smaller than that of a cavity filter, meeting the requirements for the miniaturization development of the filter.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna equipment, and more specifically, to a filter and a television antenna for suppressing 5G signal interference. Background Art

[0002] 5G is the latest generation of cellular mobile communication technology and is also an extension after 4G (LTE-A, WiMax), 3G (UMTS, LTE), and 2G (GSM) systems. Like the earlier 2G, 3G, and 4G mobile networks, the 5G mobile network is a digital cellular network. In such a network, the service area covered by a provider is divided into many small geographical areas called cells. The analog signals representing sound and images are digitized in the mobile phone, converted by an analog-to-digital converter, and transmitted as a bit stream. All 5G wireless devices in a cell communicate with the local antenna array and low-power transceivers (transmitters and receivers) in the cell via radio waves. The transceivers allocate channels from a common frequency pool, and these channels can be reused in geographically separated cells. The local antenna is connected to the telephone network and the Internet via a high-bandwidth optical fiber or a wireless backhaul connection. Similar to existing mobile phones, when users move from one cell to another, their mobile devices will automatically "switch" to the antenna in the new cell. The main advantage of the 5G network is that the data transmission rate is much higher than that of previous cellular networks, up to 10 Gbit / s, faster than the current wired Internet, and 100 times faster than the previous 4G LTE cellular network. Another advantage is lower network latency (faster response time), less than 1 millisecond, while 4G is 30 - 70 milliseconds. Due to faster data transmission, the 5G network will not only provide services for mobile phones but also become a general home and office network provider, competing with wired network providers. Previous cellular networks provided low-data-rate Internet access suitable for mobile phones, but a single mobile phone tower cannot economically provide enough bandwidth to serve as a general Internet provider for home computers. The performance goals of 5G are high data rate, reduced latency, energy savings, cost reduction, increased system capacity, and massive device connectivity.

[0003] With the development, maturity and application of 5G technology, its interference with original low-frequency signals such as TV signals is bound to become a technical problem that cannot be ignored. Abroad (especially in Europe and America), the frequency band range of 700 MHz - 800+ MHz has been designated as the 5G frequency band. Therefore, for the foreign market, it is necessary to correspondingly study the suppression of 5G signal interference above 700 MHz. In the design of suppressing 5G signal interference above 700 MHz, there are also some studies abroad at present, mainly in the following two directions: one is to use a cavity filter. This design has a relatively large shell, strict requirements for adjustable capacitor indicators, high cost, and great difficulty in debugging; the other is to use ordinary inductors and capacitors to make an LC filter. Although the cost is low, due to the low Q values of such LC components, the adjacent frequency suppression effect is not good, and basically more than 2 adjacent frequency bandwidths have to be sacrificed, which cannot meet the needs of users.

[0004] Therefore, it is necessary to have a filter that can effectively filter 5G signals. Summary of the Invention

[0005] In view of this, in order to overcome at least one of the above-mentioned deficiencies of the prior art, the present invention provides a filter for suppressing 5G signal interference, which solves the problems of poor suppression effect, large volume and high cost of existing filters for 5G signals.

[0006] In order to solve the above-mentioned existing technical problems, the present invention adopts the following technical solutions:

[0007] A filter for suppressing 5G signal interference includes a high-frequency filtering circuit with a coil suspended in a conductive isolation cavity as an inductor and a combination of the conductive isolation cavity and the dielectric therein and the coil as a capacitor.

[0008] The present invention provides a novel filtering circuit, including a conductive isolation cavity, the dielectric therein and a coil suspended in the conductive isolation cavity. The coil itself is the inductor of the high-frequency filtering circuit. In addition, the coil also forms two conductors close to each other with the conductive isolation cavity. The air dielectric or other types of dielectric in the smaller space between them forms a non-conductive insulating medium, which together constitutes a novel capacitor. In short, in the high-frequency filtering circuit, the coil is both an inductor and a conductor constituting the capacitor. The distributed parameters formed by the coil, the conductive isolation cavity and the dielectric therein are the capacitance. A large number of experiments have confirmed that the high-frequency filtering circuit has significantly better effects than ordinary LC filtering circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor constituting the capacitor, is much smaller than that of the cavity filter, meeting the requirements of the miniaturization development of the filter; by adjusting the tightness of the coil, the high-frequency filtering circuit can be easily debugged, with low debugging difficulty and much lower cost than the cavity filter. Among them, the dielectric is most preferably air dielectric, with simple production process and low cost. In addition, the dielectric can also be made of materials such as plastic, PVC, ceramic, etc.

[0009] Specifically, the conductive isolation cavity is formed by a conductive housing having avoidance holes, and the coil is suspended in the housing and connected to the outside of the conductive housing through the avoidance holes. The coil can partially extend out of the conductive housing through the avoidance holes to be connected to a signal source, or can be connected to the signal source outside the conductive housing through a conductor such as a wire. The wire can be connected to any position of the coil, such as the middle or the end of the coil.

[0010] To achieve a better suppression effect, the filter for suppressing 5G signal interference includes a plurality of the high-frequency filter circuits connected in parallel. Making the resonance frequency points of each high-frequency filter circuit near 700 MHz and having slightly different resonance frequency points for each high-frequency filter circuit helps to further improve the 5G suppression effect.

[0011] For the case where a plurality of high-frequency filter circuits are connected in parallel, a plurality of the aforementioned specific structures can be connected in parallel to the transmission line connecting the signal source one by one. This method makes the installation of the filter more flexible, but in many cases it will appear relatively loose. Therefore, the present invention provides a specific structure of a filter with multiple high-frequency filter circuits connected in parallel: including a conductive housing having two avoidance holes, a conductive partition that divides the conductive housing into a plurality of the conductive isolation cavities, and a circuit board having a transmission line spanning a plurality of conductive isolation cavities. The coils of each high-frequency filter circuit are respectively disposed in each conductive isolation cavity and one end is connected to the transmission line, and both ends of the transmission line are respectively connected to the outside of the conductive housing through the two avoidance holes.

[0012] Both ends of the transmission line are respectively a signal input end and a signal output end, and an LC filter circuit is further connected to the signal output end or the transmission line near the signal output end. Adding an LC filter circuit after the high-frequency filter circuit can filter out the high frequencies lower than the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filter circuit is a low-pass filter circuit, including a plurality of parallel resonance circuits connected in series. Adding a low-pass filter circuit after the high-frequency filter circuit can filter out the frequencies after 750 MHz again, which is beneficial to obtaining a more high-quality signal.

[0013] The circuit board further has a grounding line wound around the edge of the circuit board, and the grounding line is connected to the conductive housing to ensure good grounding of the circuit board and the conductive housing.

[0014] In addition, the present invention also provides a specific structure of a filter with multiple high-frequency filter circuits connected in parallel, including a conductive housing having two avoidance holes, a conductive partition that divides the conductive housing into a plurality of the conductive isolation cavities, and a transmission line that spans a plurality of conductive isolation cavities. The coils of each high-frequency filter circuit are respectively disposed in each conductive isolation cavity and one end is connected to the transmission line. The two ends of the transmission line are respectively connected to the outside of the conductive housing through the two avoidance holes. The two ends of the transmission line are respectively a signal input end and a signal output end, and an LC filter circuit is further connected to the signal output end. Adding an LC filter circuit after the high-frequency filter circuit can filter out the high frequencies below the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filter circuit is a low-pass filter circuit, including a plurality of parallel resonance circuits connected in series. Adding a low-pass filter circuit after the high-frequency filter circuit can filter out the frequencies after 750 MHz again, which is beneficial to obtaining a more high-quality signal.

[0015] The wire diameter of the coil is 0.5 - 1.2 mm, and the inner ring diameter of the coil is 3 - 6 mm. Using a thick coil is not only beneficial to further improving the suppression effect, but also beneficial to obtaining a high-Q high-frequency filter circuit. The coil preferably uses a copper coil. The number of turns of the coil is 5 - 13, and the number of turns of the coil is preferably 6 - 9. When the number of turns is small, the coil diameter is large. It is found that the more the number of turns of the coil, the lower the resonance frequency, and the worse the received antenna signal, or even the antenna signal cannot be received. When the number of turns of the coil is designed to be 9 turns, the best filtering effect can be achieved; moreover, if the number of turns of the coil is too small, the frequencies above 700 MHz cannot be filtered out, and the interference of the 5G signal cannot be suppressed. When the number of turns of the coil is within the foregoing range, the TV signal can be effectively received and the interference of the 5G signal can be suppressed.

[0016] The present invention also provides a TV antenna, including an antenna radiator and the filter for suppressing 5G signal interference described above. The filter for suppressing 5G signal interference described in the present invention can be built-in or externally connected to the antenna radiator for receiving TV signals, so as to suppress the interference of the 5G signal on the TV signal, enabling the user to effectively receive a smooth TV signal in the 5G environment.

[0017] The present invention has the following beneficial effects compared with the prior art: The present invention provides a novel filtering circuit, including a conductive isolation cavity and a coil suspended in the conductive isolation cavity. The coil itself is the resonant inductor of the high-frequency filtering circuit. In addition, the coil and the conductive isolation cavity form two conductors close to each other, and the air medium in the smaller space between them forms a non-conductive insulating medium, jointly constituting the resonant capacitor of the high-frequency filtering circuit, which is equivalent to a novel capacitor. In short, in the high-frequency filtering circuit, the coil is both the resonant inductor and one of the conductors constituting the resonant capacitor. A large number of experiments confirm that the high-frequency filtering circuit has significantly better effects than ordinary LC filtering circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor constituting the resonant capacitor, is much smaller than that of the cavity filter, meeting the requirements of the miniaturization development of the filter; the high-frequency filtering circuit can be easily debugged by adjusting the tightness of the coil, with low debugging difficulty and much lower cost than the cavity filter. The coil uses a thick copper coil with a wire diameter of 0.5 - 1.2 mm and a coil diameter of 3 - 6 mm, and the inductance Q value is greatly improved, forming a high-Q high-frequency filtering circuit with the conductive isolation cavity. Multiple high-frequency filtering circuits are connected in parallel, with the resonant frequency points of each high-frequency filtering circuit near 700 MHz and slightly different from each other, which helps to further improve the 5G suppression effect. A low-pass filtering circuit is added after several parallel high-frequency filtering circuits to filter out the frequencies after 750 MHz again. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 1.

[0019] Figure 2 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 2.

[0020] Figure 3 FIG. is an exploded view of the filter for suppressing 5G signal interference in Embodiment 2.

[0021] Figure 4 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 3.

[0022] Figure 5 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 4.

[0023] Figure 6 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 5.

[0024] Figure 7 FIG. is a schematic diagram of the filter for suppressing 5G signal interference in Embodiment 6.

[0025] Description of reference numerals: Conductive housing 110, avoidance hole 111, conductive partition 120, coil 200, circuit board 300, transmission line 310, ground line 320, low-pass filter circuit 400, transmission line 500. Detailed implementation mode

[0026] The accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention; for better illustration of this embodiment, some components in the accompanying drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted; the terms used to describe the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. The present invention will be further described in detail below with reference to specific embodiments.

[0027] Embodiment 1

[0028] As Figure 1 shown, a filter for suppressing 5G signal interference includes a high-frequency filter circuit with the coil 200 suspended in a conductive isolation cavity as the inductor and the combination of the conductive isolation cavity and the dielectric therein and the coil 200 as the capacitor.

[0029] This embodiment provides a novel filter circuit, including a conductive isolation cavity and the dielectric therein and the coil 200 suspended in the conductive isolation cavity. The coil 200 itself is the inductor of the high-frequency filter circuit. In addition, the coil 200 also forms two conductors close to each other with the conductive isolation cavity. The air dielectric or other types of dielectrics in the smaller space therebetween form a non-conductive insulating medium, jointly constituting a novel capacitor. In short, in the high-frequency filter circuit, the coil 200 is both an inductor and a conductor constituting the capacitor. The distributed parameters formed by the coil, the conductive isolation cavity and the dielectric therein are the capacitance. A large number of experiments have confirmed that the high-frequency filter circuit has significantly better effects than ordinary LC filter circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor constituting the capacitor, is much smaller than that of the cavity filter, meeting the requirements of the miniaturization development of the filter; the high-frequency filter circuit can be easily debugged by adjusting the tightness of the coil 200, with low debugging difficulty and much lower cost than the cavity filter. Among them, the dielectric is most preferably air dielectric, with simple production process and low cost. In addition, the dielectric can also be made of plastic, PVC, ceramic and other materials.

[0030] Specifically, the conductive isolation cavity is formed by a conductive housing 110 having an avoidance hole 111. The coil 200 is suspended in the housing and is connected to the outside of the conductive housing 110 through the avoidance hole 111. The coil 200 can partially extend out of the conductive housing 110 through the avoidance hole 111 to be connected to a signal source, or can be connected to a signal source outside the conductive housing 110 through a conductor such as a wire through the avoidance hole 111. The wire can be connected to any position of the coil 200, such as the middle or the end of the coil 200.

[0031] Embodiment 2

[0032] As Figure 2 shown, a filter for suppressing 5G signal interference includes a plurality of parallel high-frequency filter circuits with the coil 200 suspended in the conductive isolation cavity as the inductor and the combination of the conductive isolation cavity and the dielectric therein and the coil 200 as the capacitor.

[0033] This embodiment provides a novel filter circuit, including a conductive isolation cavity and the dielectric therein and the coil 200 suspended in the conductive isolation cavity. The coil 200 itself is the inductor of the high-frequency filter circuit. In addition, the coil 200 also forms two conductors close to each other with the conductive isolation cavity. The air dielectric or other types of dielectrics in the smaller space between the two form a non-conductive insulating medium, which together constitute a novel capacitor. In short, in the high-frequency filter circuit, the coil 200 is both an inductor and a conductor constituting the capacitor. The distributed parameters formed by the coil, the conductive isolation cavity and the dielectric therein are the capacitance. A large number of experiments have confirmed that the high-frequency filter circuit has significantly better effects than ordinary LC filter circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor constituting the capacitor, is much smaller than that of the cavity filter, meeting the requirements for the miniaturization development of the filter; the high-frequency filter circuit can be easily debugged by adjusting the tightness of the coil 200, with low debugging difficulty and much lower cost than the cavity filter. A plurality of the high-frequency filter circuits are used in parallel to achieve a better suppression effect. The resonance frequency points of each high-frequency filter circuit are near 700 MHz, and the resonance frequency points of each high-frequency filter circuit are slightly different, which helps to further improve the 5G suppression effect. The resonance frequency points of each high-frequency filter circuit are near 700 MHz, and the resonance frequency points of each high-frequency filter circuit are slightly different, which helps to further improve the 5G suppression effect. Among them, the dielectric is most preferably an air dielectric, with simple production process and low cost. In addition, the dielectric can also be made of materials such as plastic, PVC, and ceramic.

[0034] Specifically, as Figure 3As shown in the figure, the filter includes a conductive housing 110 having two avoidance holes 111, a conductive partition 120 that divides the conductive housing 110 into a plurality of conductive isolation cavities, and a circuit board 300 having a transmission line 310 that spans a plurality of conductive isolation cavities. The coils 200 of each high-frequency filter circuit are respectively disposed in each conductive isolation cavity and one end is connected to the transmission line 310. Both ends of the transmission line 310 are respectively connected to the outside of the conductive housing 110 through the two avoidance holes 111.

[0035] Embodiment 3

[0036] As an improved solution of Embodiment 2, as Figure 4 shown, both ends of the transmission line 310 are respectively a signal input end and a signal output end, and an LC filter circuit provided on the circuit board 300 is further connected to the transmission line 310 near the signal output end. Adding an LC filter circuit after the high-frequency filter circuit can filter out the high frequency below the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filter circuit is a low-pass filter circuit 400, which includes a plurality of parallel resonance circuits connected in series. Adding a low-pass filter circuit 400 after the high-frequency filter circuit can filter out the frequency after 750 MHz again, which is beneficial to obtaining a more high-quality signal. The circuit board 300 also has a grounding line 320 wound around the edge of the circuit board 300, and the grounding line 320 is connected to the conductive housing 110 to ensure good grounding of the circuit board and the conductive housing.

[0037] Embodiment 4

[0038] As an improved solution of Embodiment 2, as Figure 5 shown, both ends of the transmission line 310 are respectively a signal input end and a signal output end, and an LC filter circuit is further connected to the signal output end. Adding an LC filter circuit after the high-frequency filter circuit can filter out the high frequency below the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filter circuit is a low-pass filter circuit 400, which includes a plurality of parallel resonance circuits connected in series. Adding a low-pass filter circuit 400 after the high-frequency filter circuit can filter out the frequency after 750 MHz again, which is beneficial to obtaining a more high-quality signal. The circuit board 300 also has a grounding line 320 wound around the edge of the circuit board 300, and the grounding line 320 is connected to the conductive housing 110 to ensure good grounding of the circuit board and the conductive housing.

[0039] Embodiment 5

[0040] As Figure 6 shown, a filter for suppressing 5G signal interference includes a plurality of parallel high-frequency filter circuits with the coils 200 suspended in the conductive isolation cavities as inductors and the combination of the conductive isolation cavities and the dielectrics therein and the coils 200 as capacitors.

[0041] This embodiment provides a novel filtering circuit, which includes a conductive isolation cavity, a dielectric therein, and a coil 200 suspended in the conductive isolation cavity. The coil 200 itself is the inductor of the high-frequency filtering circuit. In addition, the coil 200 also forms two conductors close to each other with the conductive isolation cavity, and the air dielectric or other types of dielectrics in the smaller space between the two form a non-conductive insulating medium, jointly constituting a novel capacitor. In short, in the high-frequency filtering circuit, the coil 200 is both an inductor and a conductor that composes the capacitor. The distributed parameters formed by the coil, the conductive isolation cavity, and the dielectric therein are the capacitance. A large number of experiments have confirmed that the high-frequency filtering circuit has significantly better effects than ordinary LC filtering circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor that composes the capacitor, is much smaller than that of the cavity filter, meeting the requirements of the miniaturization development of the filter; by adjusting the tightness of the coil 200, the high-frequency filtering circuit can be easily debugged, with low debugging difficulty and much lower cost than the cavity filter. Connecting several such high-frequency filtering circuits in parallel can achieve a better suppression effect. Making the resonance frequency point of each high-frequency filtering circuit near 700 MHz and making the resonance frequency points of each high-frequency filtering circuit slightly different helps to further improve the 5G suppression effect. Making the resonance frequency point of each high-frequency filtering circuit near 700 MHz and making the resonance frequency points of each high-frequency filtering circuit slightly different helps to further improve the 5G suppression effect. Among them, the dielectric is most preferably air dielectric, with simple production process and low cost. In addition, the dielectric can also be made of materials such as plastic, PVC, and ceramic.

[0042] Specifically, the conductive isolation cavity is formed by a conductive housing 110 having an avoidance hole 111, and the coil 200 is suspended in the housing and connected to the outside of the conductive housing 110 through the avoidance hole 111. The coil 200 can partially extend out of the conductive housing 110 through the avoidance hole 111 to connect to the signal source, or can be connected to the signal source outside the conductive housing 110 through a conductor such as a wire through the avoidance hole 111. The wire can be connected to any position of the coil 200, such as the middle or the end of the coil 200. When connecting in parallel, the coils 200 connected to the outside of the conductive housing 110 are connected in parallel to the transmission line 500 connected to the signal source one by one.

[0043] Both ends of the transmission line 500 are respectively a signal input end and a signal output end, and the signal output end is also connected with an LC filtering circuit. Adding an LC filtering circuit after the high-frequency filtering circuit can filter out the high frequencies below the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filtering circuit is a low-pass filtering circuit 400, which includes a plurality of parallel resonance circuits connected in series. Adding a low-pass filtering circuit 400 after the high-frequency filtering circuit can filter out the frequencies after 750 MHz again, which is beneficial to obtaining a more high-quality signal.

[0044] Example 6

[0045] As Figure 7 shown, a filter for suppressing 5G signal interference includes a plurality of parallel high-frequency filter circuits with a coil 200 suspended in a conductive isolation cavity as the inductor and a combination of the conductive isolation cavity and the dielectric therein and the coil 200 as the capacitor.

[0046] This embodiment provides a novel filter circuit, including a conductive isolation cavity, the dielectric therein, and a coil 200 suspended in the conductive isolation cavity. The coil 200 itself is the inductor of the high-frequency filter circuit. In addition, the coil 200 and the conductive isolation cavity form two conductors close to each other, and the air dielectric or other types of dielectrics in the smaller space therebetween form a non-conductive insulating medium, jointly constituting a novel capacitor. In short, in the high-frequency filter circuit, the coil 200 is both an inductor and a conductor constituting the capacitor. The distributed parameters formed by the coil, the conductive isolation cavity, and the dielectric therein are the capacitance. A large number of experiments confirm that the high-frequency filter circuit has significantly better effects than ordinary LC filter circuits in suppressing frequencies above 700 MHz. The volume of the conductive isolation cavity, which is the other conductor constituting the capacitor, is much smaller than that of the cavity filter, meeting the requirements of the miniaturization development of the filter; the high-frequency filter circuit can be easily debugged by adjusting the tightness of the coil 200, with low debugging difficulty and much lower cost than the cavity filter. A plurality of the high-frequency filter circuits are used in parallel to achieve a better suppression effect. Making the resonance frequency point of each high-frequency filter circuit near 700 MHz and making the resonance frequency points of each high-frequency filter circuit slightly different helps to further improve the 5G suppression effect. Making the resonance frequency point of each high-frequency filter circuit near 700 MHz and making the resonance frequency points of each high-frequency filter circuit slightly different helps to further improve the 5G suppression effect. Among them, the dielectric is most preferably an air dielectric, with simple production process and low cost. In addition, the dielectric can also be made of materials such as plastic, PVC, and ceramic.

[0047] Specifically, the filter includes a conductive housing 110 having two avoidance holes 111, a conductive partition 120 dividing the conductive housing 110 into a plurality of the conductive isolation cavities, and a transmission line 500 spanning a plurality of conductive isolation cavities. The coil 200 of each high-frequency filter circuit is disposed in each conductive isolation cavity and one end is connected to the transmission line 500, and both ends of the transmission line 500 are respectively connected to the outside of the conductive housing 110 through the two avoidance holes 111.

[0048] Both ends of the transmission line 500 are a signal input end and a signal output end respectively, and an LC filter circuit is further connected to the signal output end. Adding an LC filter circuit after the high-frequency filter circuit can filter out the high frequencies below the 5G signal again, which is beneficial to improving the signal quality. Preferably, the LC filter circuit is a low-pass filter circuit 400, which includes a plurality of parallel resonance circuits connected in series. Adding the low-pass filter circuit 400 after the high-frequency filter circuit can filter out the frequencies after 750 MHz again, which is beneficial to obtaining a more high-quality signal.

[0049] As a preferred solution of Embodiments 1 to 6, the wire diameter of the coil 200 is 0.5 to 1.2 mm, and the inner ring diameter of the coil 200 is 3 to 6 mm. Using a thick coil 200 is not only beneficial to further improving the suppression effect, but also beneficial to obtaining a high-Q high-frequency filter circuit. The coil 200 is preferably a copper coil 200. The number of turns of the coil 200 is 5 to 13, and the number of turns of the coil is preferably 6 - 9. When the number of turns is small, the coil diameter is large. It is found that the more turns the coil has, the lower the resonance frequency, and the worse the received antenna signal, and even the antenna signal cannot be received. When the number of turns of the coil is designed to be 9 turns, the best filtering effect can be achieved; moreover, if the number of turns of the coil is too small, the frequencies above 700 MHz cannot be filtered out, and the interference of the 5G signal cannot be suppressed. When the number of turns of the coil is within the foregoing range, the TV signal can be effectively received and the interference of the 5G signal can be suppressed.

[0050] As a specific application of the above embodiments: A TV antenna includes an antenna radiator and the filter for suppressing 5G signal interference. The filter for suppressing 5G signal interference according to the present invention can be built-in or externally connected to the antenna radiator for receiving TV signals to suppress the interference of the 5G signal on the TV signal, so that the user can effectively receive a smooth TV signal in the 5G environment.

[0051] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A filter for suppressing 5G signal interference, characterized in that, it includes a high-frequency filtering circuit with a coil suspended in a conductive isolation cavity as the inductor and the combination of the conductive isolation cavity and the dielectric therein and the coil as the capacitor.

2. The filter for suppressing 5G signal interference according to claim 1, characterized in that, the dielectric is an air dielectric.

3. The filter for suppressing 5G signal interference according to claim 1, characterized in that, the conductive isolation cavity is formed by a conductive housing with avoidance holes, and the coil is suspended in the conductive housing and connected to the outside of the conductive housing through the avoidance holes.

4. The filter for suppressing 5G signal interference according to claim 1, characterized in that, it includes a plurality of the above-mentioned high-frequency filtering circuits connected in parallel.

5. The filter for suppressing 5G signal interference according to claim 4, characterized in that, it further includes a conductive housing with two avoidance holes, a conductive partition for dividing the conductive housing into a plurality of the conductive isolation cavities, and a circuit board with a transmission line spanning a plurality of conductive isolation cavities. The coils of each high-frequency filtering circuit are respectively arranged in each conductive isolation cavity and one end is connected to the transmission line, and both ends of the transmission line are respectively connected to the outside of the conductive housing through the two avoidance holes.

6. The filter for suppressing 5G signal interference according to claim 5, characterized in that, both ends of the transmission line are respectively a signal input end and a signal output end, and an LC filtering circuit is further connected to the signal output end or the transmission line near the signal output end.

7. The filter for suppressing 5G signal interference according to claim 6, characterized in that, the LC filtering circuit is a low-pass filtering circuit and includes a plurality of parallel resonance circuits connected in series.

8. The filter for suppressing 5G signal interference according to claim 6, characterized in that, the circuit board further has a grounding line wound around the edge of the circuit board, and the grounding line is connected to the conductive housing.

9. The filter for suppressing 5G signal interference according to any one of claims 1 to 8, characterized in that, the wire diameter of the coil is 0.5 - 1.2 mm, the inner ring diameter of the coil is 3 - 6 mm, and the number of turns of the coil is 5 - 13.

10. A television antenna, characterized in that, it includes an antenna radiator and the filter for suppressing 5G signal interference according to any one of claims 1 to 9.

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