Disclosure of Invention
In order to solve the problems, the utility model provides a high-power radio frequency pulse limiter, which realizes the reflection protection of a large signal at the front end of a receiving end through a high-power PIN diode, and simultaneously realizes the automatic closed-loop control of switch limiting through a detection module, thereby playing an effective role in protecting the front end of a receiver.
The utility model adopts the technical scheme that:
the utility model provides a high-power radio frequency pulse limiter, which comprises a switch unit and a limiter unit, wherein the input end of the switch unit is used for receiving a power signal, the output end of the switch unit is connected with the input end of the limiter unit, and the output end of the limiter unit is used for outputting the limited power signal; the switching unit comprises a detection module and a PIN switching module, wherein the detection module is used for generating detection voltage to start a PIN diode in the PIN switching module, and the PIN switching module is used for carrying out primary amplitude limiting on a power signal through the PIN diode.
Further, the PIN switch module includes a capacitor C1, a PIN diode D2, and a PIN diode D3, wherein one end of the capacitor C1 is connected to a power signal input, the other end of the capacitor C1 is connected to a common end of the PIN diode D1 and the PIN diode D2, the other ends of the PIN diode D1 and the PIN diode D2 are grounded, and the common end of the PIN diode D1 and the PIN diode D2 is connected to the PIN switch module and grounded through the PIN diode D3.
Further, the distance between the PIN diode D1 and the PIN diode D3 is a quarter of the center wavelength of the limiter.
Further, the detection module includes an inductor L1, an inductor L2, a detection tube V1, an operational amplifier driver A1, an inductor L3, a capacitor C2, and a capacitor C3, where one end of the inductor L1 is grounded, the other end of the inductor L1 is connected in series with the detection tube V1, the operational amplifier driver A1, and the inductor L3, and then connected to a common end of the PIN diode D1 and the PIN diode D2, one end of the inductor L2 is connected to a common end of the inductor L1 and the detection tube V1, the other end of the inductor L2 is grounded, one end of the capacitor C2 is connected to a common end of the detection tube V1 and the operational amplifier driver A1, the other end of the capacitor C3 is grounded, and the other end of the capacitor C3 is grounded.
Further, the clipping unit includes a PIN diode D4, a PIN diode D5, a schottky diode D6, and a capacitor C4, where a common terminal of the PIN diode D4 and the PIN diode D5 is connected to an output terminal of the switching unit, the other ends of the PIN diode D4 and the PIN diode D5 are grounded, a common terminal of the PIN diode D4 and the PIN diode D5 is connected to an output terminal of the clipping unit through the capacitor C4, an anode of the schottky diode D6 is connected to a common terminal of the PIN diode D4 and the PIN diode D5, and a cathode is grounded.
Further, the clipping unit further includes a choke coil L4, one end of the choke coil L4 is connected to a common terminal of the PIN diode D4 and the PIN diode D5, and the other end is grounded.
Further, the device also comprises a combining unit and a coupling unit, wherein the output end of the combining unit and the output end of the limiting unit are connected with the input end of the coupling unit, and the output end of the coupling unit is used for outputting a coupling signal.
Compared with the prior art, the utility model has at least the following advantages or beneficial effects:
1. the PIN switching principle is adopted to realize the reflective protection of large signals. When the large signal enters, one part of the large signal is coupled to the detection tube to be converted into a voltage signal, and the voltage signal is amplified by the operational amplifier and then input to the PIN diode end, so that the PIN diode end reaches the starting voltage and is conducted. Therefore, the power signal is subjected to primary amplitude limiting, so that the high-power signal of the main circuit is attenuated and then enters an amplitude limiting unit to be subjected to secondary amplitude limiting.
2. The detection diode is adopted to realize the generation of detection voltage, and the automatic closed-loop switch amplitude limiting control is realized through the operational amplifier.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples
Referring to fig. 1, an embodiment of the present utility model provides a high-power rf pulse limiter, which includes a switch unit and a limiter unit, wherein an input end of the switch unit is used for receiving a power signal, an output end of the switch unit is connected with an input end of the limiter unit, and an output end of the limiter unit is used for outputting the limited power signal; the switching unit comprises a detection module and a PIN switching module, wherein the detection module is used for generating detection voltage to start a PIN diode in the PIN switching module, and the PIN switching module is used for carrying out primary amplitude limiting on a power signal through the PIN diode.
Further, the PIN switch module includes a capacitor C1, a PIN diode D2, and a PIN diode D3, wherein one end of the capacitor C1 is connected to a power signal input, the other end of the capacitor C1 is connected to a common end of the PIN diode D1 and the PIN diode D2, the other ends of the PIN diode D1 and the PIN diode D2 are grounded, and the common end of the PIN diode D1 and the PIN diode D2 is connected to the PIN switch module and grounded through the PIN diode D3.
The detection module comprises an inductor L1, an inductor L2, a detection tube V1, an operational amplifier driver A1, an inductor L3, a capacitor C2 and a capacitor C3, wherein one end of the inductor L1 is grounded, the other end of the inductor L1 is connected with a common end of the PIN diode D1 and the PIN diode D2 after being connected in series through the detection tube V1, the operational amplifier driver A1 and the inductor L3, one end of the inductor L2 is connected with a common end of the inductor L1 and the detection tube V1, the other end of the inductor L2 is grounded, one end of the capacitor C2 is connected with a common end of the detection tube V1 and the operational amplifier driver A1, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with a common end of the operational amplifier driver A1 and the inductor L3, and the other end of the capacitor C3 is grounded.
Referring to fig. 1, in the above embodiment, the input high-power rf signal (e.g. 7000W) is split into two paths, one path is coupled to the detector tube to be converted into a voltage signal, and the voltage signal is amplified by the op-amp driver and then input to the PIN diode terminal, so that the PIN diode terminal reaches the turn-on voltage and is turned on. Therefore, the primary amplitude limiting is carried out on the power signal, so that the high-power signal of the main path is attenuated and then enters the amplitude limiting unit to carry out the secondary amplitude limiting, and the protection effect is achieved. The inductor L3 in the detection module stores electric energy when the PIN diode is conducted, and releases electric energy when the PIN diode is cut off, so that current flows in the circuit, a current loop is closed, and automatic closed-loop type switch amplitude limiting control is realized. The other path of the signal is subjected to primary amplitude limiting through a conducting PIN diode after passing through a blocking capacitor C1, and is input into an amplitude limiting unit for secondary amplitude limiting after passing through a microstrip line, so that the front end of the receiver is effectively protected. The PIN diode may be, for example, of the type MA4P604-131.
Further, the distance between the PIN diode D1 and the PIN diode D3 is a quarter of the center wavelength of the limiter.
In the above embodiment, as shown in fig. 1, the microstrip line length between the two points A, B is strictly calculated as a quarter wavelength, and when the PIN diode D3 at the point B is turned on, the reflective switch protection is realized. In addition, the amplitude limiting unit adopts an amplitude limiting diode to realize amplitude limiting output of signals, and the length of a micro-strip line between C, D is one quarter wavelength, so that effective protection of large signals is realized. Meanwhile, the isolation of radio frequency signals can be improved through the quarter-wavelength microstrip line.
In some embodiments of the present utility model, the clipping unit includes a PIN diode D4, a PIN diode D5, a schottky diode D6, and a capacitor C4, wherein a common terminal of the PIN diode D4 and the PIN diode D5 is connected to an output terminal of the switching unit, the other terminals of the PIN diode D4 and the PIN diode D5 are grounded, the common terminal of the PIN diode D4 and the PIN diode D5 is connected to an output terminal of the clipping unit through the capacitor C4, an anode of the schottky diode D6 is connected to a common terminal of the PIN diode D4 and the PIN diode D5, and a cathode is grounded.
In some embodiments of the present utility model, the clipping unit further includes a choke coil L4, one end of the choke coil L4 is connected to a common terminal of the PIN diode D4 and the PIN diode D5, and the other end is grounded.
In the above embodiment, the clipping section is composed of two PIN diodes (PIN diode D4 and PIN diode D5) connected in parallel. In the positive half cycle and the negative half cycle of the radio frequency signal, two diodes alternately provide direct current paths for opposite sides, so that the purpose of amplitude limiting is achieved. And then, the limiting output power of the limiting diode is further limited through the Schottky diode D6, so that the low-power output amplitude is finally realized, and the advantages of low threshold and high conduction rate are achieved. The choke L4 isolates the dc path from the rf path by opening the dc path and by opening the ac path at high frequency, eliminating the coupling between the ac signal and the dc source and ground. And then the output signal is filtered by a capacitor C4, so that the quality of the output signal is ensured.
Referring to fig. 2, in some embodiments of the present utility model, the apparatus further includes a combining unit and a coupling unit, wherein an output end of the combining unit and an output end of the clipping unit are both connected to an input end of the coupling unit, and an output end of the coupling unit is used for outputting a coupling signal.
In the above embodiment, the two-way combined signal realizes the 3dB synthesis of the amplitude and the 0 ° superposition of the phase through the two-in-one combiner, and realizes the balanced synthesis of the signals. The two-in-one combiner is a Wilkinson microstrip miniature combiner. And one path of signals formed by the combiner and the high-power signals subjected to amplitude limiting form one path of synthesized wave beam through the coupler. Wherein, the coupling synthesis adopts a thin film ceramic miniaturized integrated coupler with the coupling degree of 20 dB. The radio frequency signals are coupled and then output, so that 20dB coupling output of the signals is realized. In addition, the product package adopts modularized package, which is beneficial to engineering application.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.