CN215872077U - Antenna tuning box - Google Patents
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- CN215872077U CN215872077U CN202120404628.3U CN202120404628U CN215872077U CN 215872077 U CN215872077 U CN 215872077U CN 202120404628 U CN202120404628 U CN 202120404628U CN 215872077 U CN215872077 U CN 215872077U
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Abstract
The utility model relates to an antenna tuning box, which comprises a box body and a radio frequency cable switching module, wherein the radio frequency cable switching module comprises a plurality of radio frequency cable adapters with different specifications and is arranged on the box body of the antenna tuning box; the first ends of the radio frequency cable adapters are used for connecting radio frequency cables with corresponding specifications, and the second ends of the radio frequency cable adapters are mutually connected with the second ends of other radio frequency cable adapters. Above-mentioned antenna tuning box has still set up radio frequency cable switching module on the box body of antenna tuning box except having the harmonious function of antenna, including the radio frequency cable adapter of a plurality of different specifications, and the staff can carry out the switching through radio frequency cable switching module when overhauing the antenna that is connected with different radio frequency cables, need not to carry various different radio frequency cables, reduces the kind that the staff carried equipment, makes things convenient for the staff operation.
Description
Technical Field
The utility model relates to the field of railway communication system maintenance, in particular to an antenna tuning box.
Background
The train, the station and the dispatching center generally adopt a wireless train dispatching system for wireless communication, and the wireless train dispatching system mainly comprises an antenna, a feeder line, wireless train dispatching equipment, wireless train tail equipment and the like. An antenna feeder formed by the antenna and the feeder generally has a high failure rate, and the antenna feeder needs to be frequently detected, maintained and the like in order to ensure the normal operation of a wireless train dispatching system. And at present, when detecting the antenna feeder, the staff faces the inconvenient problem of operation.
SUMMERY OF THE UTILITY MODEL
Based on this, there is a need for an antenna tuning box. The embodiment of the utility model provides an antenna tuning box, which comprises a radio frequency cable switching module, a radio frequency cable switching module and a control module, wherein the radio frequency cable switching module comprises a plurality of radio frequency cable adapters with different specifications and is arranged on the outer wall of a box body of the antenna tuning box; and one end of each radio frequency cable adapter, which is positioned outside the box body, is used for connecting a radio frequency cable with a corresponding specification, and the other end of each radio frequency cable adapter is mutually connected in series with other radio frequency cable adapters.
In one embodiment, the radio frequency cable adapter module includes a first radio frequency cable adapter, a second radio frequency cable adapter, a third radio frequency cable adapter and a fourth radio frequency cable adapter; one end of the first radio frequency cable adapter, which is positioned outside the box body, is used for connecting a first radio frequency cable; one end of the second radio frequency cable adapter, which is positioned outside the box body, is used for connecting a second radio frequency cable; one end, positioned outside the box body, of the third radio frequency cable adapter is used for connecting a third radio frequency cable; one end of the fourth radio frequency cable adapter, which is positioned outside the box body, is used for connecting a fourth radio frequency cable; the first radio frequency cable adapter, the second radio frequency cable adapter, the third radio frequency cable adapter and the fourth radio frequency cable adapter are located the inside one end of box body is established ties each other.
In one embodiment, the radio frequency cable adapter module further includes a four-way connector, and the ends of the first radio frequency cable adapter, the second radio frequency cable adapter, the third radio frequency cable adapter and the fourth radio frequency cable adapter, which are located inside the box body, are connected in series through the four-way connector.
In one embodiment, the radio frequency cable adapter module further includes a fifth radio frequency cable, and the ends of the first radio frequency cable adapter, the second radio frequency cable adapter, the third radio frequency cable adapter and the fourth radio frequency cable adapter, which are located inside the box body, are connected in series through the fifth radio frequency cable.
In one embodiment, the first radio frequency cable adapter, the second radio frequency cable adapter, the third radio frequency cable adapter and the fourth radio frequency cable adapter are arranged on the outer wall of the box body at intervals of 4-6 cm.
In one embodiment, the antenna tuning box comprises an antenna tuning circuit connected with the signal transceiver and the antenna, the antenna tuning circuit comprising an impedance matching adjustment circuit, a sampling circuit, and an impedance matching feedback circuit; the input end of the impedance matching adjusting circuit is connected with the signal transceiver, and the output end of the impedance matching adjusting circuit is connected with the input end of the sampling circuit and the antenna, and is used for adjusting the impedance between the antenna and the signal transceiver so as to enable the antenna and the signal transceiver to achieve impedance matching; the output end of the sampling circuit is connected with the input end of the impedance matching feedback circuit and is used for sampling the signal subjected to impedance adjustment; the impedance matching feedback circuit is used for feeding back whether the antenna and the signal transceiver reach impedance matching or not according to the power of the signal.
In one embodiment, the impedance matching adjusting circuit comprises a coarse adjusting unit, a fine adjusting unit and a fine adjusting unit; the coarse adjustment unit is used for performing coarse adjustment on the impedance between the antenna and the signal transceiver; the fine adjustment unit is used for performing fine adjustment on the impedance; the micro-adjustment unit is used for micro-adjusting the impedance; the coarse adjustment unit, the fine adjustment unit and the fine adjustment unit are connected in series; wherein the adjustment step size of the impedance by the coarse adjustment unit is larger than that by the fine adjustment unit; the adjustment step length of the impedance by the fine adjustment unit is larger than that of the impedance by the fine adjustment unit.
In one embodiment, the impedance matching feedback circuit includes a radio frequency power meter, which is connected to the output end of the sampling circuit, and is configured to receive the power of the signal and display the power of the signal, and further configured to display a corresponding standing wave ratio according to the power of the signal, so as to feed back whether the antenna and the signal transceiver reach impedance matching.
In one embodiment, the box body comprises an upper cover, a cavity, a connecting piece and a fixing piece; the upper cover is connected with the box body through the connecting piece and is fixed with the cavity through the fixing piece; the radio frequency cable switching module is arranged on the outer wall of the cavity, and the antenna tuning circuit is arranged inside the cavity.
In one embodiment, the radio frequency power meter is arranged on the upper cover of the box body.
Above-mentioned antenna tuning box, except having the harmonious function of antenna, still set up radio frequency cable switching module on the box body of antenna tuning box, including the radio frequency cable adapter of a plurality of different specifications, the staff can carry out the switching through radio frequency cable switching module when overhauing the antenna that is connected with different radio frequency cables, need not to carry various different radio frequency cables, reduces the kind that the staff carried equipment, makes things convenient for the staff operation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rf cable adapter module according to an embodiment;
fig. 2 is a schematic structural diagram of an antenna tuning box according to an embodiment;
fig. 3 is a schematic structural diagram of an antenna tuning circuit according to an embodiment;
fig. 4 is a schematic structural diagram of an impedance matching adjusting circuit according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As described in the background art, when a worker overhauls an antenna feeder, the problem of inconvenient operation exists, and the inventor finds that the problem is caused because at present, not all train wireless train dispatching systems on a train are in the same specification, and is particularly embodied on an antenna component of the wireless train dispatching system, and currently, 400M antennas mainly used in the wireless train dispatching systems are: barrel antennas, omnidirectional antennas, directional antennas, and the like; and the 400K antenna has: loop antennas, frame antennas, whip antennas, etc. The antennas have different impedance characteristics and therefore require the connection of corresponding radio frequency cables. On this basis, when the staff overhauld the antenna, do not know which kind of antenna of needs maintenance, so need carry multiple radio frequency cable, the kind is various and weight is great, inconvenient staff's operation.
For the above reasons, embodiments of the present invention provide an antenna tuning box. When detecting and maintaining the wireless train dispatching system, the wireless tuning box is an indispensable device, and is a device for realizing impedance matching between a signal transceiver and an antenna in the wireless train dispatching system. The antenna tuning box mainly comprises a box body and an antenna tuning circuit arranged in the box body. The antenna tuning circuit generally comprises a reactor, a resistor and the like, and the parameter values of the reactor and the resistor are reasonably set so that the antenna and the signal transceiver can achieve an impedance matching state. It can be understood that the transmission and processing between the signal transceiver and the antenna are high-frequency signals, and in the transmission process of the high-frequency signals, if the parameters of the transmission structure are not properly set, the signals are reflected when reaching a load point, the power of the signals obtained by the load point is reduced, the signal transmission effect is poor, and distortion occurs. The impedance matching means a state where the impedance of the signal source, the load, and the transmission line reaches a state where the resistance components are equal and the reactance components are equal in absolute value and opposite in sign, and in this state, the signal can act on the load with maximum power so that the signal can be transmitted without distortion.
The wireless tuning box in this embodiment further includes a radio frequency cable adapter module, and the radio frequency cable adapter module includes a plurality of radio frequency cable adapters of different specifications, and is disposed on the box body of the antenna tuning box. The radio frequency cable adapter is an element for adapting radio frequency cables with different specifications. Currently, radio frequency cables with various specifications, such as SMA connectors, BNC connectors, UHF connectors, etc., have completely different structural forms, so that they cannot be used in a mixed manner. In order to reduce the trouble brought by carrying different radio frequency cables by workers, a plurality of radio frequency cable connectors are integrated by utilizing the box body of the wireless tuning box, and the radio frequency cables can be switched by a radio frequency cable switching module by depending on fewer kinds of radio frequency cables, so that the radio frequency cables are mixed.
And one end of each radio frequency cable adapter, which is positioned outside the box body, is used for connecting a radio frequency cable with a corresponding specification, and the other end of each radio frequency cable adapter is mutually connected in series with other radio frequency cable adapters. It can be understood that the radio frequency cable adapter is a dual-port component, and when the radio frequency cable adapter is arranged on the outer wall of the antenna tuning box, one end of the radio frequency cable adapter can be located inside the box body, and the other end of the radio frequency cable adapter can extend out of the box body. The ends, located inside the box body, of the radio frequency cable adapters are connected in series and can be conducted mutually, so that the radio frequency cable adapters of different specifications can be connected in series through the structure, and the purpose that different radio frequency cables are connected in a mixed mode is achieved.
Above-mentioned antenna tuning box has set up radio frequency cable switching module on antenna tuning box's box body, including the radio frequency cable adapter of a plurality of different specifications, the staff can carry out the switching through radio frequency cable switching module when overhauing the antenna that is connected with different radio frequency cables, need not to carry various different radio frequency cables, reduces the kind that the staff carried equipment, makes things convenient for the staff operation.
Further, in an embodiment, referring to fig. 1 and fig. 2, the rf adapter module includes a first rf cable adapter 10, a second rf cable adapter 12, a third rf cable adapter 14, and a fourth rf cable adapter 16. The first rf cable adapter 10 is disposed at an end of the box 100 for connecting a first rf cable. The end of the second rf cable adapter 12 outside the box 100 is used to connect a second rf cable. The end of the third radio frequency cable adapter 14 external to the cassette body 100 is adapted to connect to a third radio frequency cable. The end of the fourth rf cable adapter 16 outside the box 100 is used to connect a fourth rf cable. The first radio frequency cable adapter 10, the second radio frequency cable adapter 12, the third radio frequency cable adapter 14 and the fourth radio frequency cable adapter 16 are connected in series at one end inside the box 100. The size of the box body 100 of the antenna tuning box and the type number of the common radio frequency cables in the wireless train tuning system are comprehensively considered, the number of the radio frequency cable adapters in the radio frequency cable adapter module is set to be four, the space on the box body 100 is well utilized, and the requirements on radio frequency cable adapter in most practical applications can be met.
In one embodiment, referring to fig. 1 and fig. 2, the first rf cable adapter 10, the second rf cable adapter 12, the third rf cable adapter 14, and the fourth rf cable adapter 16 may be assembled on the outer wall of the box 100 by the fixing base and the screws, so that each rf cable adapter is fixed on the outer wall of the box 100. This embodiment is merely illustrative of the manner in which each rf cable adapter is disposed on the outer wall of the box 100, and is not exhaustive, as long as each rf cable adapter can be fixed on the box 100.
In one embodiment, the rf cable adapter module further includes a fifth rf cable, and the ends of the first rf cable adapter 10, the second rf cable adapter 12, the third rf cable adapter 14, and the fourth rf cable adapter 16 inside the box 100 are connected by the fifth rf cable. The radio frequency cable adapters can be connected together in series through a fifth radio frequency cable. It can be understood that the fifth radio frequency cable is a radio frequency cable having four joints, and the four joints are in one-to-one correspondence with the specifications of the joints at the end of the box body 100 where the first radio frequency cable adapter 10, the second radio frequency cable adapter 12, the third radio frequency cable adapter 14 and the fourth radio frequency cable adapter 16 are located, so as to realize that the radio frequency cable adapters are connected in series.
In another embodiment, the ends of the first rf cable adapter 10, the second rf cable adapter 12, the third rf cable adapter 14, and the fourth rf cable adapter 16 inside the box 100 may also be connected to a four-way connector, so as to connect in series.
It can be understood that the first radio frequency cable adapter 10, the second radio frequency cable adapter 12, the third radio frequency cable adapter 14, and the fourth radio frequency cable adapter 16 may also be connected in other forms, which is not limited to the forms mentioned in the above embodiments, as long as it can achieve the effect of connecting the radio frequency cable adapters in series.
In one embodiment, referring to fig. 1 and fig. 2, a first rf cable adapter 10, a second rf cable adapter 12, a third rf cable adapter 14, and a fourth rf cable adapter 16 are horizontally disposed on the box 100. In addition, in one embodiment, the first radio frequency cable adapter 10, the second radio frequency cable adapter 12, the third radio frequency cable adapter 14 and the fourth radio frequency cable adapter 16 are disposed on the outer wall of the box 100 at a distance of 4-6 cm. It will be appreciated that some tools are sometimes required to fit rf cables to rf cable adapters, and that it is inconvenient for a worker to perform the procedure if the rf cable adapters are spaced too closely together. However, if the rf cable adapters are spaced too far apart, there is insufficient space on the housing 100 of the antenna tuning box. Therefore, the distance between the cable adapters can be set to be 4-6 cm.
In one embodiment, the antenna tuning circuitry of the antenna tuning box is connected to the signal transceiver 70 and the antenna 90, as shown in FIG. 3. The antenna tuning circuit includes an impedance matching adjustment circuit 50, a sampling circuit 52, and an impedance matching feedback circuit 54. The impedance matching adjusting circuit 50 has an input end connected to the signal transceiver 70 and an output end connected to the antenna 90, and is used for adjusting the impedance between the antenna 90 and the signal transceiver 70 so as to match the impedance between the antenna 90 and the signal transceiver 70. It can be understood that different antennas 90 have different impedance characteristics, and the impedance matching circuit with fixed impedance cannot meet the requirement of processing different antennas 90, and the impedance matching adjusting circuit 50 is provided in this embodiment, so that impedance matching between various antennas 90 and the signal transceiver 70 can be realized by adjusting the setting of the circuit, so that maximum power can be obtained for signal transmission between the antennas 90 and the signal transceiver 70. Signal transceiver 70 includes, but is not limited to, a station device in a wireless train system.
An output terminal of the impedance matching adjusting circuit 50 is connected to an input terminal of the sampling circuit 52, and samples the impedance-adjusted signal and outputs the sampled signal. In order to analyze the adjustment effect of the impedance matching adjusting circuit 50, the adjusted signal needs to be sampled.
The output of the sampling circuit 52 is connected to the input of the impedance matching feedback circuit 54, and the impedance matching feedback circuit 54 is used to obtain the sampled signal and feed back the impedance matching between the antenna 90 and the signal transceiver 70 according to the power of the sampled signal. Based on the feedback result of the impedance matching feedback circuit 54, it can be known whether the parameters of the impedance matching circuit need to be adjusted continuously.
In one embodiment, as shown in fig. 4, the impedance matching adjusting circuit 50 includes a coarse adjusting unit 50A, a fine adjusting unit 50B, and a fine adjusting unit 50C, and the coarse adjusting unit 50A, the fine adjusting unit 50B, and the fine adjusting unit 50C are connected in series with each other. The coarse adjustment unit 50A, the fine adjustment unit 50B, and the fine adjustment unit 50C are used to adjust the impedance between the antenna 90 and the signal transceiver 70. However, the adjustment step size of the coarse adjustment unit 50A is larger than that of the fine adjustment unit 50B, and the adjustment step size of the fine adjustment unit 50B is larger than that of the fine adjustment unit 50C. The coarse adjustment unit 50A is used to make a wide-range, coarse, and quick adjustment of the impedance between the antenna 90 and the signal transceiver 70. When the coarse adjustment unit 50A cannot make the impedance matching more effective, fine adjustment is then performed using the fine adjustment unit 50B. Finally, fine adjustment is performed using the fine adjustment unit 50C to achieve the best impedance matching effect.
Further, in one embodiment, the coarse adjustment unit 50A is a first adjustable potentiometer, the fine adjustment unit 50B is a second adjustable potentiometer, and the fine adjustment unit 50C is a third adjustable potentiometer. The first adjustable potentiometer, the second adjustable potentiometer and the third adjustable potentiometer are connected in series. The adjustment step length corresponding to the knob of the first adjustable potentiometer is larger than that corresponding to the knob of the second adjustable potentiometer, and the adjustment step length corresponding to the knob of the second adjustable potentiometer is larger than that corresponding to the knob of the third adjustable potentiometer.
In one embodiment, the impedance matching feedback circuit 54 includes the rf power meter 30, and the rf power meter 30 is connected to the output terminal of the sampling circuit 52 for receiving the power of the sampling signal and displaying the standing wave ratio of the sampling signal according to the power of the sampling signal. The rf power meter 30 is a testing device capable of simultaneously testing the forward and reflected powers of the sampled signal and obtaining the standing-wave ratio of the sampled signal, and displays the power and standing-wave ratio of the signal to be tested through the gauge head of the rf power meter 30. It will be appreciated that the standing wave ratio is a factor reflecting the ratio between the incident energy and the reflected energy, and as the standing wave ratio of the signal increases, it represents more reflected energy, i.e., less effective impedance matching between the antenna 90 and the signal transceiver 70; when the standing wave ratio of the signal is equal to 1, it represents that the impedance between the antenna 90 and the signal transceiver 70 is perfectly matched. When the signal transceiver 70 transmits a radio frequency signal to the antenna 90 through the antenna tuning circuit, the impedance matching adjusting circuit 50 in the antenna tuning circuit performs impedance matching adjustment on the radio frequency signal, and the sampling circuit 52 samples the forward radio frequency signal subjected to impedance matching adjustment and outputs the forward radio frequency signal to the radio frequency power meter 30. If the impedance between the antenna and the signal transceiver 70 is not perfectly matched, a back-reflected signal is generated, and the sampling circuit 52 samples the reflected signal and outputs the sampled signal to the rf power meter 30. The rf power meter 30 calculates the standing-wave ratio of the radio station transmitting signal according to the obtained forward rf signal and the obtained backward reflected signal, and displays the standing-wave ratio on the meter. The standing wave ratio may feed back whether or not antenna 90 and signal transceiver 70 are impedance matched.
In one embodiment, referring to fig. 2, the antenna tuning box further includes a cover 110 for covering the box body 100.
In one embodiment, referring to fig. 2, the rf power meter 30 is disposed on the outer surface of the cover 110.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An antenna tuning box comprises a box body and is characterized by comprising a radio frequency cable switching module, wherein the radio frequency cable switching module comprises a plurality of radio frequency cable adapters with different specifications and is arranged on the box body of the antenna tuning box; the first ends of the radio frequency cable adapters are used for connecting radio frequency cables with corresponding specifications, and the second ends of the radio frequency cable adapters are mutually connected with the second ends of the other radio frequency cable adapters.
2. The antenna tuning box of claim 1, wherein the radio frequency cable adapter module comprises a first radio frequency cable adapter, a second radio frequency cable adapter, a third radio frequency cable adapter, and a fourth radio frequency cable adapter; the first end of the first radio frequency cable adapter is used for connecting a first radio frequency cable; the first end of the second radio frequency cable adapter is used for connecting a second radio frequency cable; the first end of the third radio frequency cable adapter is used for connecting a third radio frequency cable; the first end of the fourth radio frequency cable adapter is used for connecting a fourth radio frequency cable; the first radio frequency cable adapter, the second radio frequency cable adapter, the third radio frequency cable adapter and the second end of the fourth radio frequency cable adapter are connected in series.
3. The antenna tuning box of claim 2, wherein the rf cable adapter module further comprises a fifth rf cable, and wherein the ends of the first rf cable adapter, the second rf cable adapter, the third rf cable adapter, and the fourth rf cable adapter inside the box body are connected in series via the fifth rf cable.
4. The antenna tuning box of claim 2, wherein the rf cable adapter module further comprises a four-way connector, and wherein ends of the first rf cable adapter, the second rf cable adapter, the third rf cable adapter, and the fourth rf cable adapter inside the box body are connected in series via the four-way connector.
5. The antenna tuning box of claim 2, wherein the first, second, third, and fourth radio frequency cable adaptors are disposed horizontally on the box body.
6. The antenna tuning box of claim 1, wherein the antenna tuning circuitry within the antenna tuning box comprises an impedance matching adjustment circuit, a sampling circuit, and an impedance matching feedback circuit;
the input end of the impedance matching adjusting circuit is used for being connected with a signal transceiver, and the output end of the impedance matching adjusting circuit is used for being connected with an antenna and adjusting the impedance between the antenna and the signal transceiver so as to enable the antenna and the signal transceiver to achieve impedance matching;
the input end of the sampling circuit is connected with the output end of the impedance matching adjusting circuit and is used for sampling the signals subjected to impedance adjustment and outputting sampling signals;
the input end of the impedance matching feedback circuit is connected with the output end of the sampling circuit, and the impedance matching feedback circuit is used for acquiring the sampling signal and feeding back whether the antenna and the signal transceiver reach impedance matching or not according to the power of the sampling signal.
7. The antenna tuning box of claim 6, wherein the impedance matching adjustment circuit comprises a coarse adjustment unit, a fine adjustment unit, and a fine adjustment unit; the coarse adjustment unit is used for performing coarse adjustment on the impedance between the antenna and the signal transceiver; the fine adjustment unit is used for performing fine adjustment on the impedance; the micro-adjustment unit is used for micro-adjusting the impedance; the coarse adjustment unit, the fine adjustment unit and the fine adjustment unit are connected in series; wherein the adjustment step size of the impedance by the coarse adjustment unit is larger than that by the fine adjustment unit; the adjustment step length of the impedance by the fine adjustment unit is larger than that of the impedance by the fine adjustment unit.
8. The antenna tuning box of claim 6, wherein the impedance matching feedback circuit comprises a radio frequency power meter, the radio frequency power meter is connected to the output terminal of the sampling circuit, and is configured to receive the sampled signal and display the standing wave ratio of the sampled signal according to the power of the sampled signal, so as to feed back whether the antenna and the signal transceiver reach impedance matching.
9. The antenna tuning box of claim 8, further comprising a cover for covering the box body.
10. The antenna tuning box of claim 9, wherein the rf power meter is disposed on an outer surface of the cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404628.3U CN215872077U (en) | 2021-02-24 | 2021-02-24 | Antenna tuning box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404628.3U CN215872077U (en) | 2021-02-24 | 2021-02-24 | Antenna tuning box |
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| CN215872077U true CN215872077U (en) | 2022-02-18 |
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| CN202120404628.3U Active CN215872077U (en) | 2021-02-24 | 2021-02-24 | Antenna tuning box |
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