An ultra-wideband microstrip single-pole double-throw switch circuit, implementation method and electronic device

Abstract

The application provides an ultra-wideband microwave single-pole double-throw switch circuit, an implementation method and electronic equipment, and the circuit comprises a high-frequency channel, a low-frequency channel and a switching unit, the high-frequency channel comprises a common terminal, a high-frequency terminal, a first capacitor, a first diode and a second capacitor, the low-frequency channel comprises a common terminal, a low-frequency terminal and a directional coupler, and the switching unit comprises an inductor, a second diode and the first diode and the directional coupler. The application can realize the separation of microwave radio frequency signals of different frequencies, can bear a higher power compression point for an input signal with a working signal frequency lower than 100 MHz, does not cause test distortion behavior when a measuring instrument is tested, and avoids false test results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radio frequency switch, in particular to an ultra-wideband microwave single-pole double-throw switch circuit, an implementation method and an electronic device. BACKGROUND

[0002] Microwave measuring instruments need to work from kHz to GHz frequency band due to their special application characteristics, and generally need to use ultra-wideband microwave switches to process signals of different frequency bands. Therefore, the ultra-wideband microwave switch is an important component of the microwave measuring instrument. At present, the microwave switch mostly adopts two implementation ways, one is composed of a PIN diode and a corresponding circuit, wherein different positive and negative voltages are applied to the PIN diode to make the PIN diode close or open, thereby realizing the microwave switch function; the other is composed of a field effect tube and a corresponding circuit, and different voltages are applied to the field effect to make the field effect close or open, thereby realizing the microwave switch function.

[0003] Among them, the PIN diode is not easy to realize the ultra-wideband microwave switch, and different combinations of field effect tubes can realize various ultra-wideband microwave switch products. However, due to the process limitation of the field effect tube itself, when the working frequency is lower than 100 MHz, the power compression point of the field effect tube will be greatly reduced, and the corresponding ultra-wideband microwave switch product will also show the phenomenon of corresponding reduction of power compression point below 100 MHz. When such a microwave switch is applied to a microwave measuring instrument, if the power required by the measuring instrument is greater than the power compression point that the microwave switch can withstand, the measuring instrument will obtain distorted information, resulting in incorrect measurement results. Therefore, such a switch is not suitable for microwave measuring instruments in a larger power scene. SUMMARY

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide an ultra-wideband microwave single-pole double-throw switch circuit, an implementation method and an electronic device, which can realize the separation of microwave radio frequency signals of different frequencies.

[0005] In order to achieve the above-mentioned target, the present application adopts the following technical scheme:

[0006] An ultra-wideband microwave single-pole double-throw switch circuit, characterized in that it comprises:

[0007] A high-frequency channel comprising a common end, a high-frequency end, a first capacitor, a first diode and a second capacitor, the negative electrode of the first diode being connected to the common end through the second capacitor, the positive electrode being connected to the first capacitor and the high-frequency end;

[0008] A low-frequency channel comprising a common end, a low-frequency end and a directional coupler, the directional coupler comprising an input port, an output port, a coupling port and an isolation port, the coupling port being connected to the common end, and the isolation port being connected to the low-frequency end;

[0009] A switching unit comprising an inductor, a second diode, and the first diode and a directional coupler, two ends of the inductor are connected to a power supply and a positive electrode of the first diode respectively, a positive electrode of the second diode is connected to an output port of the directional coupler, a negative electrode is grounded, and an input port of the directional coupler is connected to a negative electrode of the first diode.

[0010] As preferred, the operating frequency of the directional coupler is the same as the operating frequency of the high-frequency channel.

[0011] As preferred, the input signal of the common terminal is a high-frequency signal, a low-frequency signal or a direct current signal, the frequency range of the high-frequency signal is 15GHz-30GHz, and the frequency range of the low-frequency signal is less than 15GHz.

[0012] An implementation method of an ultra-wideband micro-patch single-pole double-throw switch circuit, characterized by being implemented in the following manner:

[0013] When the power supply is a positive voltage, the first diode and the second diode are turned on, the first capacitor and the second capacitor are turned on, the directional coupler is connected to the ground, and the high-frequency signal is transmitted from the common terminal to the high-frequency terminal;

[0014] When the power supply is a negative voltage, the first diode and the second diode are turned off, the first capacitor and the second capacitor are disconnected, the directional coupler is disconnected from the ground, and the low-frequency signal or the direct current signal is transmitted from the common terminal to the low-frequency terminal.

[0015] An electronic device characterized by being provided with the ultra-wideband micro-patch single-pole double-throw switch circuit.

[0016] The present application has the advantages of:

[0017] Compared with the ultra-wideband micro-patch single-pole double-throw switch composed of field effect tubes, when the working signal frequency is below 100MHz, the present application can withstand a higher power compression point and will not cause test distortion behavior during testing of measuring instruments, thereby avoiding false test results. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The schematic diagram of the ultra-wideband micro-patch single-pole double-throw switch circuit of the present application;

[0019] Figure 2 The simple equivalent circuit of the switch when VC is a positive voltage;

[0020] Figure 3 The simple equivalent circuit of the switch when VC is a negative voltage;

[0021] Figure 4 The transmission loss curve of the common terminal-high-frequency terminal;

[0022] Figure 5 Transmission loss curve for the common port-low frequency port. DETAILED DESCRIPTION

[0023] The application will be described in detail below in conjunction with the drawings and specific embodiments.

[0024] The application provides an ultra-wideband microwave single-pole double-throw switch circuit, which adopts a capacitor, an inductor, a PIN diode and a directional coupler to realize the ultra-wideband microwave single-pole double-throw switch through specific design. Figure 1 As shown in the figure, the common port to the high frequency port is a high frequency channel, and the common port to the low frequency port is a low frequency channel. Among them, the first capacitor C1, the second capacitor C2 and the first diode D1 constitute the high frequency channel; the directional coupler 1 constitutes the low frequency channel; the directional coupler 1, the first diode D1 and the second diode D2 constitute the high frequency channel and the low frequency channel switching unit; the power supply VC supplies power to the first diode D1 and the second diode D2 through the inductor L and the directional coupler 1, and the directional coupler 1 makes the power supply VC have no electrical contact with the low frequency channel, so as to ensure that the working frequency of the low frequency channel can be as low as direct current.

[0025] The inductor L1 allows the power supply VC to power the first diode D1 and the second diode D2, and inhibits the transmission of microwave signals to the power supply VC end; the first capacitor C1 and the second capacitor C2 are direct current isolation capacitors, allowing microwave signals to pass through; the directional coupler 1 has the same working frequency as the high frequency channel. The directional coupler 1 in the application is a microstrip line directional coupler, the length of which is one-quarter of the center working frequency of the high frequency end, and the impedance has no requirement. It includes four ports, namely the input port P1, the output port P2, the coupling port P3 and the isolation port P4. The coupling port P3 is connected to the common port, the isolation port P4 is connected to the low frequency port, the positive electrode of the second diode D2 is connected to the output port P2 of the directional coupler 1, and the negative electrode is grounded. The input port P1 of the directional coupler 1 is connected to the negative electrode of the first diode D1. Only the directional coupler 1 is on the low frequency channel, which ensures that the low frequency channel can withstand a larger power and improves the power compression point of the low frequency channel. Therefore, for the ultra-wideband microwave single-pole double-throw switch, a larger power compression point performance is realized in the entire working frequency band.

[0026] The ultra-wideband microwave single-pole double-throw switch of the application can realize the function of an ultra-wideband microwave switch, and the high frequency microwave range is 15GHz~30GHz, and the low frequency microwave range is DC~15GHz.

[0027] The working mode of the ultra-wideband microwave single-pole double-throw switch of the application is as follows:

[0028] When the power supply VC is a positive voltage, the first diode D1 and the second diode D2 are turned on, the first capacitor C1 and the second capacitor C2 are in a connected state, the directional coupler 1 is connected to the ground, and the microwave signal is transmitted from the common port to the high frequency port.

[0029] When the power supply VC is a negative voltage, the first diode D1 and the second diode D2 are cut off, the first capacitor C1 and the second capacitor C2 are in a disconnected state, the directional coupler 1 is disconnected with the ground, and the microwave signal is transmitted from the common end to the low-frequency end; and there is only the directional coupler from the common end to the low-frequency end, and a microwave signal with a larger power can be transmitted. That is, when the VC is a negative voltage, the first diode D1 and the second diode D2 are cut off, and the first diode D1 and the second diode D2 present a very large impedance, which prevents the transmission of the microwave signal. For the microwave signal, the directional coupler 1 is equivalent to being in a disconnected state with the ground.

[0030] Figure 2 is the simple equivalent circuit of the switch when the VC is a positive voltage, Figure 3 is the simple equivalent circuit of the switch when the VC is a negative voltage, Figure 2 and Figure 3 The inductance and the capacitance in the above are equivalent inductance and equivalent capacitance, respectively.

[0031] From Figure 4 , Figure 5 It can be seen that, by controlling the voltage VC, the performance of the ultra-wideband microwave single-pole double-throw switch can be well achieved:

[0032] When the voltage VC is a positive voltage, the microwave (radio frequency) signal is well transmitted between the common end and the high-frequency end;

[0033] When the voltage VC is a negative voltage, the microwave (radio frequency) signal is well transmitted between the common end and the low-frequency end;

[0034] In this way, microwave radio frequency signals of different frequencies are separated; because the directional coupler 1 isolates the voltage VC from the low-frequency end, the performance of transmitting a larger power of a signal with a frequency of less than 100 MHz in the low-frequency end is achieved.

[0035] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above examples do not limit the present application in any form, and any technical solution obtained by equivalent substitution or equivalent transformation falls within the protection scope of the present application.

Claims

1. An ultra-wideband microstrip single-pole double-throw switch circuit, characterized by, The application relates to a super-wideband micro single-pole double-throw switch circuit. The high-frequency channel comprises a common terminal, a high-frequency terminal, a first capacitor (C1), a first diode (D1) and a second capacitor (C2), the negative electrode of the first diode (D1) is connected with the common terminal through the second capacitor (C2), the positive electrode is connected with the first capacitor (C1) and the high-frequency terminal; The low-frequency channel comprises a common terminal, a low-frequency terminal and a directional coupler (1), the directional coupler (1) comprises an input port (P1), an output port (P2), a coupling port (P3) and an isolation port (P4), the coupling port (P3) is connected with the common terminal, and the isolation port (P4) is connected with the low-frequency terminal; The switching unit comprises an inductor (L), a second diode (D2) and the first diode (D1) and the directional coupler (1), two ends of the inductor (L) are respectively connected with a power supply (VC) and the positive electrode of the first diode (D1), the positive electrode of the second diode (D2) is connected with the output port (P2) of the directional coupler (1), the negative electrode is grounded, and the input port (P1) of the directional coupler (1) is connected with the negative electrode of the first diode (D1); The working frequency of the directional coupler (1) is the same as the working frequency of the high-frequency channel; The input signal of the common terminal is a high-frequency signal, a low-frequency signal or a direct current signal, the frequency range of the high-frequency signal is 15GHz-30GHz, and the frequency range of the low-frequency signal is less than 15GHz.

2. An implementation method of an ultra-wideband microstrip single-pole double-throw switch circuit, applied to the ultra-wideband microstrip single-pole double-throw switch circuit of claim 1, characterized in that, The method is realized in the following way: When the power supply (VC) is a positive voltage, the first diode (D1) and the second diode (D2) are turned on, the first capacitor (C1) and the second capacitor (C2) are turned on, the directional coupler (1) is connected with the ground, and the high-frequency signal is transmitted from the common terminal to the high-frequency terminal; When the power supply (VC) is a negative voltage, the first diode (D1) and the second diode (D2) are turned off, the first capacitor (C1) and the second capacitor (C2) are disconnected, the directional coupler (1) is disconnected with the ground, and the low-frequency signal or the direct current signal is transmitted from the common terminal to the low-frequency terminal.

3. An electronic device, comprising: The application further discloses a super-wideband micro single-pole double-throw switch circuit.

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