Antenna filter circuit for navigation system, antenna and navigation system

Abstract

The utility model discloses an antenna filter circuit used for a navigation system, comprising a first signal extractor used for shunting a received multi-frequency signal into a first preset frequency band signal and other frequency band signals; the filter is electrically connected with the first signal extractor and is used for receiving the other frequency band signals and filtering a second preset frequency band signal from the other frequency band signals; the second signal extractor is electrically connected with the first signal extractor and the filter and is used for receiving and combining the first preset frequency band signal and the second preset frequency band signal; wherein the frequency bands of signals which can be extracted by the first signal extractor and the second signal extractor are the same. The antenna filter circuit provided by the utility model can reduce signal loss. The utility model also discloses an antenna and a navigation system adopting the antenna filter circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, and in particular to an antenna filter circuit, an antenna and a navigation system. Background Art

[0002] At present, the navigation and positioning systems mainly include GPS, GLONASS, BDS, and GALILEO, covering the frequency bands of L1, L2, L5, G1, G2, B1, B2, B3, E1, E5, and E6. Most of the current positioning module manufacturers have also achieved full system and full frequency band coverage. Figure 1 As shown, most antenna manufacturers use microstrip lines to directly branch when building signal filtering circuits. For example, the signal received by the antenna passes through a 50Ω trace, and then directly branches into two 50Ω traces, and then connects to the 1.2GHz filter A1 and the 1.5GHz filter A2 respectively, and then directly combines the two 50Ω traces into a 50Ω trace.

[0003] However, this approach will cause impedance mismatch in the filter circuit, increase link loss, and also affect the filtering effect of the filter circuit. Utility Model Content

[0004] The main purpose of the utility model is to provide an antenna filter circuit, aiming to solve the problem of large link loss of the antenna filter telephone in the prior art.

[0005] To achieve the above object, in one aspect of the present utility model, an antenna filter circuit for a navigation system is provided, the antenna filter circuit comprising:

[0006] A first signal extractor, used for splitting the received multi-frequency signal into a first preset frequency band signal and other frequency band signals;

[0007] A filter, electrically connected to the first signal extractor, for receiving the remaining frequency band signals and filtering out the second preset frequency band signal from the remaining frequency band signals;

[0008] The second signal extractor is electrically connected to the first signal extractor and the filter, respectively, and is used for receiving and combining the first preset frequency band signal and the second preset frequency band signal.

[0009] The first signal extractor and the second signal extractor can extract the same signal frequency band.

[0010] In some embodiments, the first signal extractor has a first port and a second port, the filter has a third port and a fourth port, the second signal extractor has a fifth port and a sixth port, the first port is connected to the third port, the fourth port is connected to the fifth port, the second port is connected to the sixth port, the first port is used to transmit the remaining frequency band signals, the second port is used to transmit the first preset frequency band signal, and the fourth port is used to transmit the second preset frequency band signal.

[0011] In some embodiments, the first signal extractor further has a seventh port, and the seventh port is used to receive the multi-frequency signal.

[0012] In some embodiments, the second signal extractor further has an eighth port, and the eighth port is used to transmit the combined first preset frequency band signal and the second preset frequency band signal.

[0013] In some embodiments, the first port, the third port, the fourth port, and the fifth port are all unidirectional ports, and the second port and the sixth port are all bidirectional ports.

[0014] In some embodiments, the first signal extractor and the filter are electrically connected via a 50Ω trace;

[0015] and / or, the first signal extractor and the second signal extractor are electrically connected via a 50Ω wiring;

[0016] And / or, the filter and the second signal extractor are electrically connected via a 50Ω wiring.

[0017] In some embodiments, the first signal extractor is used to extract a 1.5 GHz signal.

[0018] In some embodiments, the filter is used to filter out 1.2 GHz signals.

[0019] In another aspect of the present invention, an antenna is provided. The antenna includes the antenna filter circuit as described above.

[0020] In yet another aspect of the present invention, a navigation system is provided. The navigation system includes the antenna as described above.

[0021] Compared with the antenna filtering circuit in the prior art, the antenna filtering circuit of the technical solution of the utility model uses a signal extractor to extract a signal of a first preset frequency band (such as 1.5GHz) from the multi-frequency signal during the filtering process of the multi-frequency signal, and transmits the first preset frequency band signal to another signal extractor, thereby reducing the loss of the first preset frequency band signal.

[0022] On the other hand, the remaining frequency band signals after extracting the first preset frequency band are transmitted to the filter, the signal of the second preset frequency band (such as 1.2GHz) is filtered out by the filter, and the second preset frequency band signal is transmitted to another signal extractor.

[0023] Since there is no routing bifurcation when the second preset frequency band signal is transmitted from the filter to another signal extractor, the loss of the second preset frequency band signal is reduced, so that the second preset frequency band signal can be transmitted to another signal extractor more completely, and finally combined with the first preset frequency band signal and transmitted to the load end. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an antenna filter circuit in the prior art;

[0025] Figure 2 It is a structural schematic diagram of the antenna filter circuit of an embodiment of the utility model.

[0026] Description of Figure Numbers:

[0027] first signal extractor 100 ; first port 110 ; second port 120 ; seventh port 130 ; filter 200 ; third port 210 ; fourth port 220 ; second signal extractor 300 ; fifth port 310 ; sixth port 320 ; eighth port 330 .

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom, side...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0032] In addition, the descriptions involving "first", "second", etc. in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0033] In view of the technical defects existing in the related art, this embodiment provides an antenna filter circuit for a navigation system, such as Figure 2 As shown, the antenna filtering circuit of this embodiment includes a first signal extractor 100 , a filter 200 and a second signal extractor 300 .

[0034] The first signal extractor 100 is used to split the received multi-frequency signal into a first preset frequency band signal and other frequency band signals. The multi-frequency signal may include 1.2 GHz, 1.3 GHz, 1.5 GHz, 2.3 GHz, 3 GHz and other signals, but is not limited thereto.

[0035] Exemplarily, the first signal extractor 100 of this embodiment is used to extract a 1.5 GHz signal. When the aforementioned multi-frequency signal passes through the first signal extractor 100, the first signal extractor 100 extracts only a signal in the 1.5 GHz frequency band from the multi-frequency signal. That is, the multi-frequency signal is split into a 1.5 GHz signal and signals of the remaining frequency bands including the remaining 1.2 GHz, 1.3 GHz, 2.3 GHz, and 3 GHz frequency bands.

[0036] The filter 200 is electrically connected to the first signal extractor 100 , so as to receive the remaining frequency band signals transmitted by the first signal extractor 100 , and filter out the second preset frequency band signal from the remaining frequency band signals.

[0037] Exemplarily, the filter 200 of this embodiment only allows 1.2 GHz signals to pass through, and signals in other frequency bands cannot pass through the filter 200 of this embodiment. When the filter 200 receives signals in other frequency bands transmitted by the first signal extractor 100, it filters out 1.2 GHz signals.

[0038] The second signal extractor 300 is electrically connected to the first signal extractor 100 and the filter 200, respectively, and the first signal extractor 100 and the second signal extractor 300 can extract the same signal frequency band, so that the second signal extractor 300 can receive both the 1.5 GHz signal transmitted by the first signal extractor 100 and the 1.2 GHz signal transmitted by the filter 200. After receiving the 1.5 GHz signal and the 1.2 GHz signal, the second signal extractor 300 combines the 1.5 GHz signal and the 1.2 GHz signal and transmits them to the load end.

[0039] When the antenna filter circuit of this embodiment is used to filter the multi-frequency signal, on the one hand, the first signal extractor 100 extracts the signal of the first preset frequency band (such as 1.5GHz) from the multi-frequency signal, and transmits the first preset frequency band signal to the second signal extractor 300. Since there is no wiring bifurcation on the transmission path of the first preset frequency band signal, the loss of the first preset frequency band signal is reduced, so that the first preset frequency band signal can be transmitted to the second signal extractor 300 more completely.

[0040] On the other hand, the remaining frequency band signals after extracting the first preset frequency band are transmitted to the filter 200, and the signal of the second preset frequency band (such as 1.2GHz) is filtered out by the filter 200, and the second preset frequency band signal is transmitted to the second signal extractor 300. Since there is no wiring bifurcation in the process of transmitting the second preset frequency band signal from the filter 200 to the second signal extractor 300, the loss of the second preset frequency band signal is reduced, so that the second preset frequency band signal can be transmitted to the second signal extractor 300 more completely.

[0041] In summary, when the antenna filter circuit of this embodiment filters the multi-frequency signal, the preset frequency band signal can be retained more completely, thereby improving the filtering effect of the antenna filter circuit. In addition, the first signal extractor 100 used to extract the 1.5GHz signal and the filter 200 used to filter the 1.2GHz signal are both exemplary. The implementer can use the first signal extractor 100 and the second signal extractor 300 for extracting other frequency band signals according to actual needs, or use the filter 200 that can filter other frequency band signals, without limitation.

[0042] Furthermore, if Figure 2 As shown, the first signal extractor 100 of this embodiment has a first port 110 and a second port 120, the filter 200 has a third port 210 and a fourth port 220, and the second signal extractor 300 has a fifth port 310 and a sixth port 320. The first port 110, the third port 210, the fourth port 220, and the fifth port 310 are all unidirectional ports, and the second port 120 and the sixth port 320 are both bidirectional ports.

[0043] In this embodiment, the first port 110 is connected to the third port 210, the fourth port 220 is connected to the fifth port 310, and the second port 120 is connected to the sixth port 320. Exemplarily, the first port 110 is used to transmit the remaining frequency band signals, the second port 120 is used to transmit the first preset frequency band signals, and the fourth port 220 is used to transmit the second preset frequency band signals.

[0044] In summary, the filter 200 receives the remaining frequency band signals through the third port 210 connected to the first port 110, and the second signal extractor 300 receives the second preset frequency band signal through the fifth port 310 connected to the fourth port 220 on the one hand, and receives the first preset frequency band signal through the sixth port 320 connected to the second port 120 on the other hand.

[0045] Furthermore, if Figure 2 As shown, the first signal extractor 100 further has a seventh port 130 for receiving a multi-frequency signal. The second signal extractor 300 further has an eighth port 330 for transmitting the combined first preset frequency band signal and the second preset frequency band signal.

[0046] For example, the connection wiring between the first signal extractor 100, the filter 200 and the second signal extractor 300 of this embodiment can adopt 50Ω wiring, that is, the first signal extractor 100 and the filter 200, the first signal extractor 100 and the second signal extractor 300, and the filter 200 and the second signal extractor 300 are all electrically connected through 50Ω wiring. Of course, wiring with other impedance specifications can also be used according to actual needs, and there is no limitation on this.

[0047] In some embodiments, an antenna and a navigation system using the antenna are also provided. The antenna of this embodiment uses the antenna filter circuit of the previous embodiment, so the antenna of this embodiment can reduce the loss of the required frequency band signal, which is conducive to establishing a more stable communication connection, thereby improving the working stability of the navigation system using the antenna.

[0048] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. An antenna filter circuit for a navigation system, characterized in that: include: A first signal extractor, used for splitting the received multi-frequency signal into a first preset frequency band signal and other frequency band signals; a filter, electrically connected to the first signal extractor, configured to receive the remaining frequency band signals and filter out the second preset frequency band signal from the remaining frequency band signals; a second signal extractor, electrically connected to the first signal extractor and the filter, respectively, and configured to receive and combine the first preset frequency band signal and the second preset frequency band signal; The first signal extractor and the second signal extractor can extract the same signal frequency band.

2. The antenna filter circuit according to claim 1, characterized in that: The first signal extractor has a first port and a second port, the filter has a third port and a fourth port, the second signal extractor has a fifth port and a sixth port, the first port is connected to the third port, the fourth port is connected to the fifth port, the second port is connected to the sixth port, the first port is used to transmit the remaining frequency band signals, the second port is used to transmit the first preset frequency band signals, and the fourth port is used to transmit the second preset frequency band signals.

3. The antenna filter circuit according to claim 2, characterized in that: The first signal extractor also has a seventh port, and the seventh port is used to receive the multi-frequency signal.

4. The antenna filter circuit according to claim 2, characterized in that: The second signal extractor further has an eighth port, and the eighth port is used to transmit the combined first preset frequency band signal and the second preset frequency band signal.

5. The antenna filter circuit according to claim 2, characterized in that: The first port, the third port, the fourth port, and the fifth port are all unidirectional ports, and the second port and the sixth port are all bidirectional ports.

6. The antenna filter circuit according to any one of claims 1 to 5, characterized in that: The first signal extractor and the filter are electrically connected via a 50Ω wiring; And / or, the first signal extractor and the second signal extractor are electrically connected via a 50Ω wiring; And / or, the filter and the second signal extractor are electrically connected via a 50Ω wiring.

7. The antenna filter circuit according to claim 6, characterized in that: The first signal extractor is used to extract a 1.5 GHz signal.

8. The antenna filter circuit according to claim 7, characterized in that: The filter is used to filter out 1.2 GHz signals.

9. An antenna, characterized in that: The invention comprises the antenna filter circuit as claimed in any one of claims 1 to 8.

10. A navigation system, characterized in that: Comprising the antenna as claimed in claim 9.

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