CN218103090U - Absorption type narrow-band radio frequency high-power amplitude limiting protection circuit - Google Patents
Absorption type narrow-band radio frequency high-power amplitude limiting protection circuit Download PDFInfo
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- CN218103090U CN218103090U CN202222217047.6U CN202222217047U CN218103090U CN 218103090 U CN218103090 U CN 218103090U CN 202222217047 U CN202222217047 U CN 202222217047U CN 218103090 U CN218103090 U CN 218103090U
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Abstract
The utility model belongs to the technical field of the amplitude limiting protection circuit, a high-power amplitude limiting protection circuit of absorption formula narrowband radio frequency is disclosed, including IN port and OUT port, be equipped with first electric capacity C1, microstrip line TL1, second electric capacity C2 between IN port and the OUT port IN order, be equipped with first order amplitude limiting protection circuit between first electric capacity C1 and the microstrip line TL1, be equipped with second level amplitude limiting protection circuit between microstrip line TL1 and the second electric capacity C2, first order amplitude limiting protection circuit passes through resistance R1 ground connection. The utility model discloses absorb interference signal through absorbing load resistance R1, not only played the effect of amplitude limiting protection, still improved the input standing wave ratio under the protected state for interference signal can not all reflect the preceding stage circuit, has improved the linearity of preceding stage circuit, can also improve the electromagnetic compatibility of whole circuit simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the amplitude limiting protection circuit, concretely relates to high-power amplitude limiting protection circuit of absorption formula narrowband radio frequency.
Background
Amplitude limiting protection circuits in wireless communication, measurement equipment, and radar equipment are often used at the very front of the receive chain to prevent excessive signal input from damaging the front portion of the receive chain with high sensitivity. The existing radio frequency amplitude limiting protection circuit is basically formed by diodes, and a forward diode and a reverse diode are connected in parallel to carry out hard clamping on an input signal, so that the amplitude of the input interference signal is limited within a certain range, and a fragile receiving circuit at the rear stage is protected. Because the diode is in a conducting state when the protection circuit works, the overall impedance is in a low impedance mode, and the input standing-wave ratio is extremely high, an input interference signal can be reflected back to a front-stage antenna or a power amplifier, so that the linearity index of the whole system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving above-mentioned technical problem to a certain extent at least. Therefore, the utility model aims to provide an absorption formula narrowband radio frequency high-power amplitude limiting protection circuit.
The utility model discloses the technical scheme who adopts does:
the utility model provides a high-power amplitude limit protection circuit of absorption formula narrowband radio frequency, includes IN port and OUT port, is equipped with first electric capacity C1, microstrip line TL1, second electric capacity C2 between IN port and the OUT port IN order, is equipped with first order amplitude limit protection circuit between first electric capacity C1 and the microstrip line TL1, is equipped with second order amplitude limit protection circuit between microstrip line TL1 and the second electric capacity C2, and first order amplitude limit protection circuit passes through resistance R1 ground connection.
Preferably, the first-stage amplitude limiting protection circuit comprises a first diode V1 and a second diode V2 which are connected, a resistor R1 is arranged on a connection circuit between the first diode V1 and the second diode V2, and the resistor R1 is grounded.
Preferably, the first stage of clipping protection circuit comprises a third diode V3 and a fourth diode V4 connected with each other.
Preferably, the length of the microstrip line TL1 is a quarter wavelength corresponding to the operating frequency of the circuit.
Preferably, the resistance value of the resistor R1 is equal to the front-stage and rear-stage end impedances of the circuit, and the power borne by the resistor R1 is greater than the power of the maximum input interference signal.
Preferably, the first capacitor C1 and the second capacitor C2 are coupling dc blocking capacitors.
The utility model has the advantages that:
the utility model provides a high-power amplitude limiting protection circuit of absorption formula narrowband radio frequency, include the two-stage amplitude limiting protection circuit who constitutes by the diode, and be used for constituting resonance reflection's microstrip line TL1, be used for absorbing interference signal's resistance R1, and be used for stopping direct coupling's electric capacity C1 and C2, the utility model discloses a peculiar 1/4 wavelength line access mode and absorption load, absorb interference signal through absorption load resistance R1, not only played the effect of amplitude limiting protection, still improved the input standing-wave ratio under the guard mode for interference signal can not all reflect the preceding stage circuit, has improved the linearity of preceding stage circuit, can also improve the electromagnetic compatibility of whole circuit simultaneously, is applicable to the higher radio equipment of linearity or electromagnetic compatibility requirement.
Drawings
Fig. 1 is a schematic diagram of an absorption type narrow-band radio frequency high-power amplitude limiting protection circuit of the present invention.
Detailed Description
The present invention will be further explained with reference to specific examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown IN fig. 1, the absorption-type narrow-band radio-frequency high-power amplitude limiting protection circuit of the embodiment includes an IN port and an OUT port, a first capacitor C1, a microstrip line TL1 and a second capacitor C2 are sequentially arranged between the IN port and the OUT port, a first-stage amplitude limiting protection circuit is arranged between the first capacitor C1 and the microstrip line TL1, a second-stage amplitude limiting protection circuit is arranged between the microstrip line TL1 and the second capacitor C2, and the first-stage amplitude limiting protection circuit is grounded through a resistor R1.
The first capacitor C1 and the second capacitor C2 are coupling dc blocking capacitors, and prevent the circuit from being affected by the input of external dc voltage.
The first diode V1 and the second diode V2 form a first-stage amplitude limiting protection circuit, when a large interference signal is input, the first diode V1 and the second diode V2 are conducted, and the dissipation power and the reverse breakdown voltage of the first diode V1 and the second diode V2 are higher than the power and the peak voltage of the maximum input interference signal. A resistor R1 is arranged on a connecting circuit between the first diode V1 and the second diode V2, and the resistor R1 is grounded.
The resistor R1 is used as an absorption load, the resistance value of the resistor R1 is equal to the impedance of the front and rear stages of the circuit, and the bearing power of the resistor R1 is larger than the power of the maximum input interference signal.
The third diode V3 and the fourth diode V4 form a second-stage amplitude limiting protection circuit, and when a small interference signal is input and the first diode V1 and the second diode V2 cannot be completely conducted, the interference signal leaked to the rear stage conducts the third diode V3 and the fourth diode V4, so that the amplitude limiting protection effect is further achieved.
The microstrip line TL1 is a reflective microstrip line, the length of which is a quarter wavelength corresponding to the operating frequency of the circuit, and the width of which depends on the bandwidth of the operating frequency of the circuit.
When an interference signal with high power is input, the first diode V1 and the second diode V2 are firstly conducted and protected, the interference signal bypasses the resistor R1 to absorb a load, the first-stage amplitude limiting protection circuit reduces the power of the interference signal to a half of the input interference signal at the moment, the reduced interference signal conducts the third diode V3 and the fourth diode V4 of the second-stage amplitude limiting protection circuit, the microstrip line TL1 presents high resistance to the interference signal at the moment, the reduced interference signal is reflected back to the first-stage amplitude limiting protection circuit and is further absorbed by the R1.
At this time, in view of the input end, due to the existence of the resistor R1, the end impedance always presents the same value as the impedance of the front end, the standing wave ratio is extremely small, and the reflection of the high-power interference signal is not caused.
Because the interference signal reflection in the circuit mainly depends on the high impedance characteristic presented by the microstrip line TL1, and the impedance characteristic of the microstrip line TL1 has strong frequency dependence, the circuit can normally work near the resonance point of the microstrip line TL1, and the problem of interference signal leakage still occurs at the frequency far away from the resonance point. Therefore, the circuit is only suitable for narrow-band application environment with relative bandwidth not exceeding 15%.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (6)
1. An absorption type narrow-band radio frequency high-power amplitude limiting protection circuit is characterized in that: including IN port and OUT port, be equipped with first electric capacity C1, microstrip line TL1, second electric capacity C2 between IN port and the OUT port IN order, be equipped with first order amplitude limiting protection circuit between first electric capacity C1 and the microstrip line TL1, be equipped with second level amplitude limiting protection circuit between microstrip line TL1 and the second electric capacity C2, first order amplitude limiting protection circuit passes through resistance R1 ground connection.
2. The absorption-type narrow-band radio frequency high-power amplitude-limiting protection circuit according to claim 1, wherein: the first-stage amplitude limiting protection circuit comprises a first diode V1 and a second diode V2 which are connected, a resistor R1 is arranged on a connecting circuit between the first diode V1 and the second diode V2, and the resistor R1 is grounded.
3. The absorption-type narrow-band radio frequency high-power amplitude-limiting protection circuit according to claim 1, wherein: the first-stage amplitude limiting protection circuit comprises a third diode V3 and a fourth diode V4 which are connected.
4. The absorption-type narrow-band radio frequency high-power amplitude-limiting protection circuit according to claim 1, wherein: the length of the microstrip line TL1 is a quarter wavelength corresponding to the operating frequency of the circuit.
5. The absorption-type narrowband radio-frequency high-power amplitude-limiting protection circuit according to claim 1, characterized in that: the resistance value of the resistor R1 is equal to the impedance of the front and rear stages of the circuit, and the bearing power of the resistor R1 is larger than the power of the maximum input interference signal.
6. The absorption-type narrowband radio-frequency high-power amplitude-limiting protection circuit according to claim 1, characterized in that: the first capacitor C1 and the second capacitor C2 are coupling blocking capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222217047.6U CN218103090U (en) | 2022-08-22 | 2022-08-22 | Absorption type narrow-band radio frequency high-power amplitude limiting protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222217047.6U CN218103090U (en) | 2022-08-22 | 2022-08-22 | Absorption type narrow-band radio frequency high-power amplitude limiting protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218103090U true CN218103090U (en) | 2022-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222217047.6U Active CN218103090U (en) | 2022-08-22 | 2022-08-22 | Absorption type narrow-band radio frequency high-power amplitude limiting protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218103090U (en) |
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2022
- 2022-08-22 CN CN202222217047.6U patent/CN218103090U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An Absorbing Narrowband RF High Power Limiting Protection Circuit Effective date of registration: 20230724 Granted publication date: 20221220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: Chengdu Yuxi Electronic Technology Co.,Ltd. Registration number: Y2023980049492 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |