CN115800945A - Matching filter circuit of solid low-frequency transmitter - Google Patents
Matching filter circuit of solid low-frequency transmitter Download PDFInfo
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- CN115800945A CN115800945A CN202211390156.6A CN202211390156A CN115800945A CN 115800945 A CN115800945 A CN 115800945A CN 202211390156 A CN202211390156 A CN 202211390156A CN 115800945 A CN115800945 A CN 115800945A
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Abstract
The invention discloses a matching filter circuit of a solid low-frequency transmitter, which comprises: the first intermediate tank circuit, the Butterworth filter and the second intermediate tank circuit are electrically connected in sequence; the Butterworth filter is used for impedance matching and restraining higher harmonic components; the first middle tank circuit and the second middle tank circuit respectively comprise a capacitor frame group and an adjustable inductance coil group which are connected in series; the capacitor frame group and the adjustable inductance coil group are arranged through the change-over switch to achieve the purpose that corresponding capacitors or inductances are connected into the matched filtering main loop as required. The invention particularly adds the first middle tank circuit, can adjust the impedance characteristic of the access loop of the sending host so as to enable the access impedance to approximately reach a pure resistive state, and reduces the transient impact of voltage and current suffered by a power device of the solid-state sending machine during working; the operation of switching on and switching off the selector switch can realize the sectional tuning of the working frequency band of the solid-state low-frequency transmitter; therefore, the antenna has the characteristics of good matching of access impedance and sectional tuning.
Description
Technical Field
The invention relates to the technical field of communication electronic devices, in particular to a matching filter circuit of a solid-state low-frequency transmitter.
Background
Low frequency communication refers to a communication method for long distance signal transmission using radio waves. The matching filter circuit of the low-frequency transmitter is designed according to the characteristics of the electronic tube transmitter, and uses more change-over switches, thereby increasing the complexity of a control system.
The solid-state transmitter power amplifier circuit is composed of power electronic devices with high power density, different from electronic tubes or hydrogen-filled thyristors, these devices are sensitive to the circuit characteristics of the load connected in the circuit, and when the connected circuit has strong sensitivity or capacitance, the power devices can generate higher voltage spikes or larger transient pulsating currents in the process of switching on or switching off, and the higher harmonic content in the power amplifier circuit can also be increased. Therefore, the circuit characteristics after the host sender have great influence on the power amplifier loop, which shortens the service life and damages the device. This problem exists if the aforementioned matched filter circuit for a tube transmitter is used directly and the solid state transmitter output is connected directly to the filter.
In addition, before the low-frequency transmitter works, tuning is required to be carried out according to different working frequencies, when the frequency is changed, tuning is required to be realized through switch switching, the sub-band 3-order pi-type filter at least needs to control the switching operation of 12 change-over switches, the sub-band 7-order butterworth filter needs to control the switching operation of more change-over switches, and although the tuning control system automatically executes the switching action according to the tuning operation table during tuning, the switching time required for carrying out a series of switch switching operations is still longer.
Disclosure of Invention
In view of at least one of the above-mentioned drawbacks and needs of the prior art, the present invention provides a matching filter circuit for a solid-state low-frequency transmitter, wherein the structure of the key components and the design of the circuit connection thereof are designed to achieve the desired matching filter effect while greatly reducing the complexity of the control system, and the matching filter circuit has the characteristics of compact structure, convenience in operation and control, capability of meeting the working requirements of a high-power solid-state low-frequency transmitter, and the like.
In order to achieve the above object, the present invention provides a matching filter circuit for a solid-state low-frequency transmitter, comprising: the first intermediate tank circuit, the Butterworth filter and the second intermediate tank circuit are electrically connected in sequence;
the Butterworth filter is used for impedance matching and restraining higher harmonic components;
the first middle tank circuit and the second middle tank circuit respectively comprise a capacitor frame group and an adjustable inductance coil group which are connected in series;
the capacitor rack group is composed of a main capacitor rack with a relatively large overall capacitance value and a plurality of additional capacitor racks with relatively small overall capacitance values, the main capacitor rack is always connected into the main matched filter loop in series, and the additional capacitor racks are respectively connected into the main matched filter loop in parallel with the main capacitor rack through corresponding change-over switches; the first middle tank circuit is connected with an external transmitting host through an access point of a capacitor rack group;
the adjustable inductance coil group is composed of a plurality of adjustable inductance coils which are connected in series with each other in the matched filtering main loop, the connection position of the adjustable inductance coils of the first middle tank circuit is connected with the access point of the Butterworth filter through a change-over switch, and the connection position of the adjustable inductance coils of the second middle tank circuit is connected with the access point of an external rear-stage coupling circuit through a change-over switch.
Furthermore, the capacitor rack group of the first intermediate tank circuit is composed of a main capacitor rack with a relatively large overall capacitance value and an additional capacitor rack with a relatively small overall capacitance value; the adjustable inductance coil group of the first middle tank circuit is formed by two adjustable inductance coils which are mutually connected in series in the matched filtering main loop.
Furthermore, the capacitor rack group of the second intermediate tank circuit is composed of a main capacitor rack with a relatively large overall capacitance value and an additional capacitor rack with a relatively small overall capacitance value; the adjustable inductance coil group of the second middle tank circuit is formed by three adjustable inductance coils which are mutually connected in series in the matched filtering main loop.
Further, the main capacitor rack and the additional capacitor rack each include a plurality of capacitor groups arranged in series on the busbar, and each capacitor group is composed of a plurality of capacitors connected in parallel.
Furthermore, the adjustable range of the inductance value of each adjustable inductance coil is the same, and the linkage of the plurality of adjustable inductance coils is controlled through a servo motor.
Furthermore, the butterworth filter is composed of a plurality of fixed inductance coils and a plurality of capacitor holders, the fixed inductance coils are connected in series in the matched filtering main loop, and each capacitor holder is composed of a plurality of capacitors which are connected in parallel with each other and arranged on a busbar; one end of the integral structure of each capacitor rack is respectively connected to the connection position of the fixed inductance coils, and the other end of the integral structure of each capacitor rack is respectively grounded.
Further, the butterworth filter is composed of four fixed inductors and three capacitor holders, wherein the inductance values of the first and fourth fixed inductors at two ends are the same, and the inductance values of the second and third fixed inductors in the middle are the same; for the three capacitor holders, the total capacitance values of the first capacitor holder and the third capacitor holder at the two ends are the same, and the total capacitance value of the second capacitor holder in the middle is different from the total capacitance values of the other two capacitor holders.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) The invention designs the specific structure and the circuit connection mode of the key component of the matching filter circuit of the high-power solid-state low-frequency transmitter by combining the working characteristics of the high-power solid-state low-frequency transmitter, particularly adds a first middle tank circuit, and can correspondingly adjust the impedance characteristic of an access loop of the transmitter, so that the access impedance of the transmitter can approximately reach a pure resistance state, and the transient impact of voltage and current on a power device of the solid-state transmitter during working is reduced. In addition, it also plays a certain role in filtering.
(2) The invention designs the internal structure of the first and the second middle tank circuits, especially the arrangement mode of the change-over switch, can carry out the segmental tuning of the working frequency band of the solid-state low-frequency transmitter by only switching on and off the change-over switch of the first and the second middle tank circuits, and the adjustable inductance coils of the first and the second middle tank circuits can also play the role of adjusting the inductance values of the first and the last two fixed inductance coils of the Butterworth filter, thereby leading the Butterworth filter to better play the role of matched filtering.
(3) The internal structure of the Butterworth filter is designed, and a large number of change-over switches can be omitted, so that the complexity of a tuning control system can be effectively reduced, and the frequency point switching time can be shortened.
(4) The matched filter circuit designed by the invention has the characteristics of compact integral structure, convenient operation and control, good matching property of access impedance and sectional tuning, and practical tests show that the matched filter circuit can greatly reduce the higher harmonic content of the output current of a transmitter, has flexible impedance matching characteristic, and can effectively reduce the complexity of a tuning control system, thereby being particularly suitable for the matched filter application of a solid low-frequency transmitter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram illustrating an overall configuration of a matched filter circuit of a solid-state low-frequency transmitter according to an embodiment of the present invention;
fig. 2 is a specific circuit structure diagram of a matched filter circuit of a solid-state low-frequency transmitter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The terms "first," "second," or "third," etc. in the description, claims, or drawings of the present application are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment, a schematic diagram of an overall configuration of a matched filter circuit of a solid-state low-frequency transmitter according to the present invention is shown in fig. 1, the matched filter circuit includes a first middle tank circuit, a butterworth filter and a second middle tank circuit, which are connected in circuit in sequence, wherein two ends of the butterworth filter are respectively connected in series with the first middle tank circuit and the second middle tank circuit, and a ground terminal thereof is connected to the ground; one end (shown as the left end in the figure) of the first intermediate tank circuit is connected with the output end of the transmitting host, and the other end (shown as the right end in the figure) of the first intermediate tank circuit is connected with the input end of the Butterworth filter; one end (shown as the left end in the figure) of the second intermediate tank circuit is connected to the output end of the butterworth filter, and the other end (shown as the right end in the figure) is connected to the input end of the subsequent coupling circuit.
As shown in fig. 2, each of the first and second middle tank circuits includes a capacitor frame group and an adjustable inductance coil group connected in series with each other, where the capacitor frame group is formed by a main capacitor frame with a relatively large overall capacitance value and one or more additional capacitor frames with a relatively small overall capacitance value, the main capacitor frame is always connected in series to the matched filter main circuit, and the additional capacitor frames are connected in parallel to the main capacitor frame via corresponding switches to the matched filter main circuit, so that the additional capacitor frames can be connected to the matched filter main circuit by closing the switches; the adjustable inductance coil group is composed of a plurality of adjustable inductance coils which are mutually connected in series in a main matched filter loop, the connection position of the adjustable inductance coils of the first middle slot circuit is connected with the access point of the Butterworth filter through a change-over switch, the connection position of the adjustable inductance coils of the second middle slot circuit is connected with the access point of the rear-stage coupling circuit through the change-over switch, and therefore, part of the adjustable inductance coils can be in short circuit from the main matched filter loop through the operation of closing the change-over switch.
Referring to fig. 2, a schematic circuit diagram of a matched filter circuit according to a preferred embodiment of the present invention is exemplarily shown. As shown in fig. 2, the matched filter circuit comprises a first middle tank circuit, a butterworth filter and a second middle tank circuit which are connected in sequence, wherein for the first middle tank circuit, a capacitor rack group of the first middle tank circuit consists of a main capacitor rack C11 with a relatively large overall capacitance value and an additional capacitor rack C12 with a relatively small overall capacitance value, the main capacitor rack C11 is always connected in series into the matched filter main loop, and the additional capacitor rack C12 is connected in parallel with the main capacitor rack C11 into the matched filter main loop through a corresponding switch K11; the adjustable inductance coil group of the filter consists of two adjustable inductance coils L11 and L12 which are connected in series with each other in a matched filtering main loop, and the middle connection part of the two adjustable inductance coils is connected with an access point of the Butterworth filter through a change-over switch K12.
For the second intermediate tank circuit, the capacitor rack group of the second intermediate tank circuit is composed of a main capacitor rack C31 with a relatively large overall capacitance value and an additional capacitor rack C32 with a relatively small overall capacitance value, the main capacitor rack C31 is always connected in series into the matched filtering main loop, and the additional capacitor rack C32 is connected in parallel with the main capacitor rack C31 into the matched filtering main loop through a corresponding change-over switch K31; the adjustable inductance coil group of the filter is composed of three adjustable inductance coils L31, L32 and L33 which are connected in series with each other in a main matched filter loop, and the connection positions of the three adjustable inductance coils are respectively connected with the access point of a rear-stage coupling circuit through the change-over switches K32 and K33.
For the butterworth filter, it is composed of four fixed inductors L21, L22, L23 and L24 and three capacitor holders C21, C22 and C23 in common, where the first fixed inductor L21 at both ends has the same inductance value as the fourth fixed inductor L24, while the second fixed inductor L22 in the middle and the third fixed inductor L23 have the same inductance value; for the three capacitor racks, the total capacitance values of the first capacitor rack C21 and the third capacitor rack C23 located at two ends are the same, and the total capacitance value of the second capacitor rack C22 located in the center is different from the total capacitance value of C21 or C23.
According to a preferred embodiment of the present invention, for the main capacitor rack and the additional capacitor rack of the first and second intermediate tank circuits, each of them includes a plurality of capacitor groups arranged in series with each other on the bus bar, and each of the capacitor groups is composed of a plurality of capacitors connected in parallel with each other; in addition, the capacitor rack is integrally fixed to the ground through the insulating support, and meanwhile internal capacitors of the capacitor rack are prevented from discharging to the ground. In addition, it is preferable that the plurality of adjustable inductors of the adjustable inductor group of the first and second intermediate tank circuits have the same inductance value adjustable range, and the plurality of inductors are controlled to be linked by a servo motor, thereby adjusting the inductance value of the inductor.
According to another preferred embodiment of the present invention, the butterworth filter is composed of a plurality of fixed inductors and a plurality of capacitor holders, wherein the plurality of fixed inductors are connected in series with each other in the main matched filter circuit, each capacitor holder is composed of a plurality of capacitors connected in parallel with each other on the bus bar, one end of the overall structure of each capacitor holder is connected to the connection point between the plurality of fixed inductors, and the other end of the overall structure of each capacitor holder is grounded. Furthermore, as a further preference, the butterworth filter is composed of four fixed inductors and three capacitor holders, wherein the first fixed inductor and the fourth fixed inductor at the two ends have the same inductance value, and the second fixed inductor and the third fixed inductor in the middle have the same inductance value; for the three capacitor holders, the total capacitance values of the first capacitor holder and the third capacitor holder are the same, and the total capacitance value of the second capacitor holder is different from the total capacitance value of the third capacitor holder.
The following will explain the concept of the present invention and the related technical effects in further detail.
By adding an intermediate tank circuit and designing the capacitor rack groups of the first and second intermediate tank circuits to be sectionally adjustable as described above, the main capacitor rack with a relatively large overall capacitance value is always connected in series into the main matched filter circuit, and the additional capacitor racks with a relatively small overall capacitance value are respectively connected in parallel into the main matched filter circuit with the main capacitor rack through corresponding change-over switches, in this way, each additional capacitor rack can be separated from the main matched filter circuit by breaking the change-over switches. At the same time, by designing the inductance coil sets of the first and second intermediate tank circuits to be continuously adjustable as described above, and connecting the connections between the adjustable inductance coils to the access points of the butterworth filter or the subsequent coupling circuit via the corresponding switches, respectively, in this way, by closing the switches, it is possible to short-circuit some of the adjustable inductance coils from the matched filter main circuit.
According to the design, the capacitor frame group and the adjustable inductance coil group can form a series resonance loop, frequency segmentation is realized by different groups of the capacitor frames connected into the main matching filter loop, series resonance is realized by changing the inductance value of the adjustable inductance coil group, the access impedance of the transmitter is approximate to pure resistance by the corresponding first middle tank circuit, so that the influence of the access loop on the power amplifier loop of the transmitter is reduced, the access impedance of the circuit behind the Butterworth filter is approximate to pure resistance by the second middle tank circuit, and the influence of the primary self-inductance of the coupling circuit on the previous-stage loop which is in resonance is reduced; in particular, the first and second intermediate tank circuits can play a certain role in suppressing harmonic waves, and the adjustable inductance coils of the first and second intermediate tank circuits can also play a role in adjusting the inductance values of the head and tail fixed inductance coils of the Butterworth filter, so that the Butterworth filter can better play a role in matched filtering.
The Butterworth filter is composed of a plurality of fixed inductance coils and a plurality of capacitor racks together, the fixed inductance coils are connected in series with each other in a matched filtering main loop, the capacitor racks are respectively composed of a plurality of capacitors which are arranged on a bus bar in parallel, one end of the integral structure of each capacitor rack is connected to the connection position of the fixed inductance coils, and the other end of the integral structure of each capacitor rack is grounded.
According to the above design, the Butterworth filter composed of the fixed capacitor rack and the fixed inductance coil can restrain the higher harmonic component of the output current of the transmitter and realize the impedance matching between the transmitter and the post-stage circuit. Meanwhile, the use of a large number of change-over switches can be omitted, the complexity of the tuning control system can be effectively reduced, and the frequency point switching time can be shortened.
In practical applications, for example, for the embodiment shown in fig. 2, the number of the capacitor holders selected in a frequency band is fixed, and the adjustable inductor coil is controlled by the servo motor to rotate to achieve continuous inductanceAnd adjusting, so that the tuning operation of the first intermediate tank circuit at any frequency point in the frequency band can be realized. For example, the angular frequency of the central frequency point of the first frequency band of the first intermediate tank circuit is ω, in order to ensure that the actual Q value conforms to the engineering experience value, the Q value at the central frequency point is selected to be 6, the characteristic impedance is 10 Ω, the capacitance value required by the first frequency band can be calculated according to the formula C =1/ω RQ, and meanwhile, the capacitance value required by the first frequency band can be calculated according to the formula L =1/ω RQ 2 C, calculating the range of the required inductance in the first frequency band. The capacitance value required by the second frequency band and the inductance range required by the second frequency band can be calculated by the same method. The capacitance value of the main capacitor frame is the capacitance value required by the second frequency band, and the capacitance value of the additional capacitor frame is the difference value between the capacitance values required by the first frequency band and the second frequency band. In order to facilitate the linkage tuning operation of the adjustable inductance coils by using the servo motor, the two adjustable inductance coils of the adjustable inductance coil group are designed to be the same, and the lower limit of the inductance value range provided by the adjustable inductance coil group and the matched change-over switch is not more than the minimum value of the inductance values required by the two frequency bands respectively, and the upper limit is not less than the maximum value of the inductance values required by the two frequency bands respectively.
The second middle tank circuit is also designed according to the two frequency bands, and the difference is that a coupling circuit is connected behind the second middle tank circuit, so that the range of inductance adjustment needs to be larger, three adjustable inductance coils are selected for the adjustable inductance coil group, the Q value at the central frequency point is selected to be 7 during calculation, and the electric parameter calculation method is consistent with that of the first middle tank circuit.
In addition, as is known from a typical butterworth filter structure, the inductance values of the fixed inductors L21 and L24 of the butterworth filter may be the same, the inductance values of the fixed inductors L22 and L23 may be the same, and the capacitance values of the fixed capacitor racks C21 and C23 may be the same. The capacitance and inductance values can be calculated according to the cutoff frequency and the characteristic impedance value required by the design. In particular, to maintain design consistency, the three fixed capacitor mounts required may be identical in structure, requiring only that the fixed capacitor mount C21 have some more capacitors than the other two capacitor mounts.
The above description is merely an exemplary embodiment of the present disclosure, and the scope of the present disclosure is not limited thereto. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A solid state low frequency transmitter matched filter circuit, comprising: the first intermediate tank circuit, the Butterworth filter and the second intermediate tank circuit are electrically connected in sequence;
the Butterworth filter is used for impedance matching and restraining higher harmonic components;
the first middle tank circuit and the second middle tank circuit respectively comprise a capacitor frame group and an adjustable inductance coil group which are connected in series;
the capacitor rack group is composed of a main capacitor rack with a relatively large overall capacitance value and a plurality of additional capacitor racks with relatively small overall capacitance values, the main capacitor rack is always connected into the main matched filter loop in series, and the additional capacitor racks are respectively connected into the main matched filter loop in parallel with the main capacitor rack through corresponding change-over switches; the first middle tank circuit is connected with an external transmitting host through an access point of a capacitor rack group;
the adjustable inductance coil group is composed of a plurality of adjustable inductance coils which are connected in series with each other in the main matched filter loop, the connection position of the adjustable inductance coils of the first middle tank circuit is connected with the access point of the Butterworth filter through a change-over switch, and the connection position of the adjustable inductance coils of the second middle tank circuit is connected with the access point of an external rear coupling circuit through a change-over switch.
2. The matched filter circuit as claimed in claim 1, wherein the capacitor holder set of the first intermediate tank circuit is composed of a main capacitor holder having a relatively large overall capacitance value and an additional capacitor holder having a relatively small overall capacitance value; the adjustable inductance coil group of the first middle tank circuit is formed by two adjustable inductance coils which are mutually connected in series in the matched filtering main loop.
3. The matched filter circuit as recited in claim 1, wherein the capacitor bank of the second middle tank circuit is comprised of a main capacitor bank having a relatively large overall capacitance value and an additional capacitor bank having a relatively small overall capacitance value; and the adjustable inductance coil group of the second middle tank circuit is formed by three adjustable inductance coils which are mutually connected in series in the matched filtering main circuit.
4. The matched filter circuit as claimed in any one of claims 1 to 3, wherein the main capacitor holder and the additional capacitor holder each comprise a plurality of capacitor groups arranged in series with each other on a busbar, each of the capacitor groups being composed of a plurality of capacitors connected in parallel with each other.
5. A matched filter circuit as claimed in any one of claims 1 to 3 wherein the adjustable range of inductance values of each of said adjustable inductors is the same and the linkage of the plurality of adjustable inductors is controlled by a servo motor.
6. The matched filter circuit as claimed in claim 1, wherein said butterworth filter is composed of a plurality of fixed inductors connected in series in said matched filter main loop and a plurality of capacitor holders each composed of a plurality of capacitors disposed in parallel with each other on a bus bar; one end of the integral structure of each capacitor rack is respectively connected to the connection position of the fixed inductance coils, and the other end of the integral structure of each capacitor rack is respectively grounded.
7. The matched filter circuit as claimed in claim 6, wherein said Butterworth filter is composed of four said fixed inductors and three said capacitor holders, wherein the inductance values of the first and fourth fixed inductors at both ends are the same, and the inductance values of the second and third fixed inductors in the middle are the same; for the three capacitor holders, the total capacitance values of the first capacitor holder and the third capacitor holder at two ends are the same, and the total capacitance value of the second capacitor holder in the middle is different from the total capacitance values of the other two capacitor holders.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211390156.6A CN115800945A (en) | 2022-11-08 | 2022-11-08 | Matching filter circuit of solid low-frequency transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211390156.6A CN115800945A (en) | 2022-11-08 | 2022-11-08 | Matching filter circuit of solid low-frequency transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116539931A (en) * | 2023-06-16 | 2023-08-04 | 荣耀终端有限公司 | Radio frequency device test connection device and test system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116539931A (en) * | 2023-06-16 | 2023-08-04 | 荣耀终端有限公司 | Radio frequency device test connection device and test system |
| CN116539931B (en) * | 2023-06-16 | 2023-10-20 | 荣耀终端有限公司 | Radio frequency device test connection device and test system |
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