CN109194344B - Refined standing wave protection circuit and method for radio frequency transmitter - Google Patents
Refined standing wave protection circuit and method for radio frequency transmitter Download PDFInfo
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- CN109194344B CN109194344B CN201811275361.1A CN201811275361A CN109194344B CN 109194344 B CN109194344 B CN 109194344B CN 201811275361 A CN201811275361 A CN 201811275361A CN 109194344 B CN109194344 B CN 109194344B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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Abstract
The invention belongs to the technical field of data link communication, and particularly relates to a refined standing wave protection circuit and method for a radio frequency transmitter of a radio frequency front end component part in a data link end machine. The invention carries out forward coupling of power signals at the emission output end of a power amplifier at the front end of radio frequency and then carries out forward detection on the radio frequency signals to monitor the output of the radio frequency signals; one port of the electric bridge is connected with a detector at the receiving end of the radio frequency front end (the radio frequency signal received by the antenna enters the amplitude limiter of the power divider after passing through the cavity filter, the isolator and the electric bridge) to detect the reflected power signal, so as to detect the intensity of the reflected signal. The reflected signal intensity of the antenna port under different standing wave values is judged by comparing the voltages of the positive detector and the negative detector, so that corresponding circuit protection measures are taken. The invention has the advantages that: the forward power of the output end of the transmission link cannot be lost; when the standing wave is 5 or worse, the bearing power of the amplitude limiter at the receiving end is small, the recovery time of the amplitude limiter is increased, and the performance of the terminal machine is effectively improved.
Description
Technical Field
The invention belongs to the technical field of data link communication, and particularly relates to a refined standing wave protection circuit and method for a radio frequency transmitter of a radio frequency front end component part in a data link end machine.
Background
The wireless communication technology in the information age is widely applied and is changing day by day. The application of wireless devices in radar, electronic warfare, aerospace, satellite communication and weaponry is becoming more and more extensive, and wireless communication devices with high performance and high power output are becoming more and more the work focus of designers in order to reach farther communication distances. The performance of the radio frequency front-end component and the antenna, which are important components in data link communication, directly affects the overall performance of the data link end machine. Ideally the standing wave between the filter and the antenna is 1, i.e. there is no reflection of the signal. However, in practical situations, the standing wave between the filter and the antenna is about 2.5 due to physical design and frequency characteristics. In actual operation, the standing wave of the antenna may be poor due to antenna damage, filter damage, or connector. In order to cover the performance testability between the radio frequency front end and the antenna, alarm judgment needs to be carried out on different antenna standing waves, and corresponding protective measures need to be taken.
A common standing wave detection method is to add a forward coupler and a return coupler between the rf front-end output end (filter output) and the antenna, and when the standing waves of the antenna are different, the return detector outputs different voltage values. As shown in fig. 1, in the conventional standing wave detection circuit, a radio frequency signal passes through a power amplifier 1, then sequentially passes through a forward coupler 2, a first isolator 3, a cavity filter 4 and a return coupler 10, and then is radiated out through an antenna 5. When the standing wave between the cavity filter 4 and the antenna 5 is not good, the reflected signal enters the receiving link low noise amplifier 11 through the return coupler 10, the cavity filter 4, the second isolator 6 and the amplitude limiter 8 in sequence. The limiter 8 limits the large signal by a certain amplitude and reflects most of the signal to the load side of the second isolator 6. The forward coupler 2 detects the forward power signal intensity, and the return coupler 10 couples the return signal intensity and sends the signal intensity to the detector 9; when the standing wave between the cavity filter 4 and the antenna 5 is not good, the return detection can detect large signal reflection, so that whether to alarm and protect the circuit is judged after the return detection is compared with the forward detection signal.
The disadvantages of the method include the following aspects:
1. the forward power loss of the backward coupler is increased at the output end of the transmitting link;
2. the transmitting end filter is a cavity filter, and the output end connector of the filter is directly connected with the antenna without the condition of placing a return detector;
the radio frequency front end scheme under development is complex and small in size, and is not suitable for realizing the detection of the return standing wave by a method of adding a return coupler at the output end of the radio frequency front end in order to ensure high-power signal output and reduce the influence of a link on the noise coefficient of a receiving end as much as possible.
Disclosure of Invention
Technical problem to be solved
The invention provides a refined standing wave protection circuit and a refined standing wave protection method for an RF transmitter, and aims to solve the technical problem of how to improve the refinement degree of standing wave protection.
(II) technical scheme
In order to solve the technical problem, the invention provides a refined standing wave protection circuit of a radio frequency transmitter, which comprises a power amplifier, a forward coupler, a first isolator, a cavity filter, an antenna, a second isolator, a bridge, an amplitude limiter, a detector, a return coupler and a low noise amplifier; according to the signal flow direction, the radio frequency signal directly radiates out through the antenna after sequentially passing through the power amplifier, the forward coupler, the first isolator and the cavity filter; forward detecting the forward coupled radio frequency signal by a detector to monitor the output of the radio frequency signal; the high-power signal with bad standing wave is reflected at the cavity filter and the antenna port, passes through the cavity filter, the second isolator and the electric bridge in sequence, is averagely distributed to the two paths of amplitude limiters, enters the low-noise amplifier, and is reflected to the detector port of the electric bridge by the amplitude limiters to carry out backward detection voltage output; and judging whether to alarm and protect the circuit after comparing the backward detection voltage with the forward detection voltage.
In addition, the invention also provides a refined standing wave protection method of the radio frequency transmitter, which adopts the protection circuit as claimed in claim 1, and the protection method comprises the following steps:
s1, the radio frequency signal is radiated out through the antenna directly after passing through the power amplifier, the forward coupler, the first isolator and the cavity filter in sequence;
s2, carrying out forward detection on the forward coupled radio frequency signal through a detector to monitor the radio frequency signal output;
s3, reflecting the high-power signal with bad standing wave at the cavity filter and the antenna port, passing through the cavity filter, the second isolator and the electric bridge in sequence, averagely distributing the high-power signal to two paths of amplitude limiters, and then entering a low-noise amplifier;
s4, the large signal is reflected to the detector port of the bridge by the amplitude limiter to carry out return detection voltage output;
and S5, comparing the return detection voltage with the forward detection voltage, and judging whether to alarm and protect the circuit.
(III) advantageous effects
The invention provides a refined standing wave protection circuit and a refined standing wave protection method for an optical frequency transmitter. The invention carries out forward coupling of power signals at the emission output end of a power amplifier at the front end of radio frequency and then carries out forward detection on the radio frequency signals to monitor the output of the radio frequency signals; one port of the electric bridge is connected with a detector at the receiving end of the radio frequency front end (the radio frequency signal received by the antenna enters the amplitude limiter of the power divider after passing through the cavity filter, the isolator and the electric bridge) to detect the reflected power signal, so as to detect the intensity of the reflected signal. The reflected signal intensity of the antenna port under different standing wave values is judged by comparing the voltages of the positive detector and the negative detector, so that corresponding circuit protection measures are taken.
The invention has the advantages that: the forward power of the output end of the transmission link cannot be lost; when the standing wave is 5 or worse, the bearing power of the amplitude limiter at the receiving end is small, the recovery time of the amplitude limiter is increased, and the performance of the terminal machine is effectively improved;
drawings
FIG. 1 is a schematic block diagram of a conventional standing wave detection circuit;
fig. 2 is a schematic block diagram of a refined standing wave protection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The present embodiment provides a refined standing wave protection circuit and method for an rf transmitter, and the circuit principle is shown in fig. 2. The circuit comprises a power amplifier 1, a forward coupler 2, a first isolator 3, a cavity filter 4, an antenna 5, a second isolator 6, a bridge 7, a limiter 8, a detector 9, a return coupler 10 and a low noise amplifier 11.
According to the signal flow direction, the radio frequency signal directly radiates out through the antenna 5 after sequentially passing through the power amplifier 1, the forward coupler 2, the first isolator 3 and the cavity filter 4, and the signal link loss is less than that of the conventional method in fig. 1. The detector is used for detecting the forward direction of the radio frequency signal after forward coupling so as to monitor the output of the radio frequency signal.
When standing waves are not good, high-power signals are reflected at the ports of the cavity filter 4 and the antenna 5, pass through the cavity filter 4, the second isolator 6 and the bridge 7 in sequence, are averagely distributed to the two paths of amplitude limiters 8, enter the low-noise amplifier 11 of the receiving link, and are reflected to the port of the detector 9 of the bridge 7 by the amplitude limiters 8 to carry out backward detection voltage output. And judging whether to alarm and protect the circuit after comparing the backward detection voltage with the forward detection voltage.
By adopting the circuit structure, when the standing wave is 5 and the reflected power signal is large, the power can be distributed evenly, and the bearing power of each path of amplitude limiter 8 is reduced; and the degree of fineness of the standing wave protection in the radio frequency front end component with the cavity filter can be optimized, the requirement selection is carried out according to the standing wave protection precision, the use is convenient and flexible, and the universality is high.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A refined standing wave protection circuit of a radio frequency transmitter is characterized by comprising a power amplifier, a forward coupler, a first isolator, a cavity filter, an antenna, a second isolator, an electric bridge, an amplitude limiter, a detector and a low noise amplifier; according to the signal flow direction, the radio frequency signal directly radiates out through the antenna after sequentially passing through the power amplifier, the forward coupler, the first isolator and the cavity filter; forward detecting the forward coupled radio frequency signal by a detector to monitor the output of the radio frequency signal; the high-power signal with bad standing wave is reflected at the cavity filter and the antenna port, passes through the cavity filter, the second isolator and the electric bridge in sequence, is averagely distributed to the two paths of amplitude limiters, enters the low-noise amplifier, and is reflected to the detector port of the electric bridge by the amplitude limiters to carry out backward detection voltage output; and judging whether to alarm and protect the circuit after comparing the backward detection voltage with the forward detection voltage.
2. A refined standing wave protection method for a radio frequency transmitter, characterized in that the protection circuit of claim 1 is adopted, and the protection method comprises the following steps:
s1, the radio frequency signal is radiated out through the antenna directly after passing through the power amplifier, the forward coupler, the first isolator and the cavity filter in sequence;
s2, carrying out forward detection on the forward coupled radio frequency signal through a detector to monitor the radio frequency signal output;
s3, reflecting the high-power signal with bad standing wave at the cavity filter and the antenna port, passing through the cavity filter, the second isolator and the electric bridge in sequence, averagely distributing the high-power signal to two paths of amplitude limiters, and then entering a low-noise amplifier;
s4, the large signal is reflected to the detector port of the bridge by the amplitude limiter to carry out return detection voltage output;
and S5, comparing the return detection voltage with the forward detection voltage, and judging whether to alarm and protect the circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811275361.1A CN109194344B (en) | 2018-10-30 | 2018-10-30 | Refined standing wave protection circuit and method for radio frequency transmitter |
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| CN201811275361.1A CN109194344B (en) | 2018-10-30 | 2018-10-30 | Refined standing wave protection circuit and method for radio frequency transmitter |
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| CN109194344B true CN109194344B (en) | 2020-02-07 |
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| JP6838116B1 (en) * | 2019-09-19 | 2021-03-03 | アンリツ株式会社 | Frequency converter and high frequency signal supply method |
| CN111865442B (en) * | 2020-07-22 | 2022-06-28 | 成都九洲迪飞科技有限责任公司 | Transmitting and detecting method for transceiving component |
| CN112019230B (en) * | 2020-09-18 | 2024-07-09 | 中国电子科技集团公司第十四研究所 | Antenna high-power reflection protection system and receiving and transmitting assembly |
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| CN101651503B (en) * | 2009-08-28 | 2012-10-17 | 上海华为技术有限公司 | Method and device for detecting standing wave ratio of weather feedback system |
| WO2011111219A1 (en) * | 2010-03-12 | 2011-09-15 | 富士通株式会社 | Wireless communication apparatus and reflected wave acquiring method |
| CN201796003U (en) * | 2010-08-17 | 2011-04-13 | 杭州华三通信技术有限公司 | Standing wave detection device |
| CN102420573A (en) * | 2011-12-02 | 2012-04-18 | 熊猫电子集团有限公司 | Setting method for amplifying cluster communication power and power amplifier |
| US9196945B2 (en) * | 2012-05-29 | 2015-11-24 | Rf Micro Devices, Inc. | VSWR tolerant tunable hybrid duplexer |
| CN203225773U (en) * | 2013-04-11 | 2013-10-02 | 京信通信系统（中国）有限公司 | Antenna feed system standing wave detection device |
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