CN211453935U

CN211453935U - X-waveband double-channel transmitter

Info

Publication number: CN211453935U
Application number: CN202021048885.XU
Authority: CN
Inventors: 周文; 张富强
Original assignee: Dongfang Huatong Science And Technology Co ltd
Current assignee: Dongfang Huatong Science And Technology Co ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2020-09-08
Anticipated expiration: 2030-06-09

Abstract

The utility model provides an X-waveband double-channel transmitter, which comprises a directional coupler, a push-stage amplifier and two switchable time-sharing output channels which are connected in sequence, wherein an isolator, a one-to-two power divider, a final-stage power amplification circuit group, a combiner, an isolator and a coupler are arranged on each output channel in sequence; after passing through the directional coupler, an external radio frequency input signal is sent to a push-stage amplifier for signal amplification; the two paths of radio frequency output signals are respectively output by the two paths of output channels and finally pass through corresponding isolators, and the two paths of radio frequency output signals are also output and coupled by the coupler to output signals. Compared with the prior art, the utility model has the characteristics of small, that power consumption current is little, the timesharing is exported, and the reliability is high, is applicable to the high-power detection of various same frequency band radar systems, but the wide application is in military and civilian equipment such as machine-carried, carrier-borne, on-vehicle and missile-borne.

Description

X-waveband double-channel transmitter

Technical Field

The utility model relates to a X wave band binary channels transmitter.

Background

The prior similar technology mainly shows that the volume is large, the heat consumption is high, the function is single, the requirement of a demand party cannot be met, and the similar power amplifier roughly comprises the following processes: external radio frequency signals are sent to the input end of a power amplifier to amplify useful small signals to certain power and then sent to an excitation stage to further amplify the power, and then sent to a final stage power amplifier to amplify the power to a specified large signal, and the large signal is output after standing wave matching is carried out by an isolator; the general power amplifier only has a simple signal amplification effect, and is large in size, high in current dissipation and single in function, so that the overall requirements of the system are difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a X wave band binary channels transmitter that is applicable to radar system's high-power detection.

The technical scheme of the utility model is that:

an X-band dual-channel transmitter comprises a directional coupler, a push-stage amplifier and two switchable time-sharing output channels which are sequentially connected, wherein an isolator, a one-to-two power divider, a final-stage power amplification circuit group, a combiner, an isolator and a coupler are sequentially arranged on each output channel; after passing through the directional coupler, an external radio frequency input signal is sent to a push-stage amplifier for signal amplification; the two paths of radio frequency output signals are respectively output by the two paths of output channels and finally pass through corresponding isolators, and the two paths of radio frequency output signals are also output and coupled by the coupler to output signals.

Preferably, the two paths of time-sharing output channels are switched and output according to the high and low levels of the control signal.

Preferably, the specification of the directional coupler is as follows:

operating frequency and bandwidth: x frequency band f_-35～f₈₀；

Loss: less than or equal to 0.3 dB;

coupling degree: 10dB plus or minus 1 dB;

input and output standing wave ratio: VSWR is less than or equal to 1.3.

Preferably, the boost-stage amplifier outputs 33dBm of power and changes plus or minus 1dB of high-temperature and low-temperature gains when the input power is plus or minus 5 dBm.

Preferably, the output end of the isolator on each output channel realizes radio frequency output through a microstrip output assembly, and the insertion loss of the microstrip output assembly is less than 0.2 dB.

Preferably, each amplifier of the final power amplification circuit group adopts a 30W GaN MMIC power amplifier, the power gain is more than or equal to 18dB, and the single-path power is more than or equal to 45.5 dBm.

Compared with the prior art, the invention has the following beneficial effects:

the utility model has the characteristics of changeable two way timesharing delivery channel has timesharing output to two way timesharing delivery channel switch the output according to control signal's height, low level, and switching speed is fast, is difficult for makeing mistakes, and the reliability is high. Furthermore, the output end of the isolator on each output channel realizes radio frequency output through a microstrip output assembly, the insertion loss of the microstrip output assembly is less than 0.2dB, the power amplifier has low current power consumption, each amplifier of the final power amplification circuit group adopts a 30WGaN MMIC power amplifier, the power gain is not less than 18dB, the single-path power is not less than 45.5dBm, and the function integration level is high.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a simplified schematic diagram of the connection of the present invention;

FIG. 2 is a schematic view of the structure principle of the present invention;

wherein the reference numerals have the meanings given below:

the power amplifier comprises a 1-directional coupler, a 2-push stage amplifier, a 3-isolator, a 4-isolator, a 5-one-two power divider, a 6-one-two power divider, a 7-final stage power amplification circuit group, an 8-final stage power amplification circuit group, a 9-final stage power amplification circuit group, a 10-final stage power amplification circuit group, an 11-combiner, a 12-combiner, a 13-isolator, a 14-isolator and a 15-coupler.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a technical problem provide a high-power is surveyed suitable for radar system, have power binary channels and switch output, realize the power amplifier state and detect and the X wave band binary channels transmitter of advantages such as protect function.

As shown in fig. 1 and 2, an X-band dual-channel transmitter includes a directional coupler 1, a push-stage amplifier 2, an isolator 3, an isolator 4, a one-to-two power divider 5, a one-to-two power divider 6, a final-stage power amplifier circuit 7, a final-stage power amplifier circuit 8, a final-stage power amplifier circuit 9, a final-stage power amplifier circuit 10, a combiner 11, a combiner 12, an isolator 13, an isolator 14, and a coupler 15.

An external radio frequency input signal passes through the directional coupler 1 and then is sent to the push-stage amplifier 2 for signal amplification, and the principle is that a small signal is input, two paths of signals are output in a time-sharing mode and are controlled by an output channel switching signal. And outputting a channel switching signal high level, outputting a channel I, outputting a channel switching signal high level, and outputting a channel II. The method has the characteristics of high conversion speed, low power consumption, high output power and the like. Has the functions of power division and amplification, and the isolation between the two paths is high.

The first channel signal is divided into two paths of signals by a one-to-two power divider 5 through an isolator 3, and then the two paths of signals are respectively sent to a final power amplifying circuit 7 and a final power amplifying circuit 8, and the two paths of amplified signals are synthesized by a combiner 11 and then output through an isolator 13.

The two-channel signal is divided into two paths of signals by a one-to-two power divider 6 through an isolator 4, and then the two paths of signals are respectively sent to a final power amplifying circuit 9 and a final power amplifying circuit 10, and the two paths of amplified signals are synthesized by a combiner 12 and then output through an isolator 14.

The two radio frequency output signals are coupled and output through a coupler 15.

The model selection design of the main modules is further described as follows:

a. the directional coupler is customized to have the advantages of good standing wave, high flatness, long bandwidth, good directivity and small loss. The specifications of the pre-coupling module are as follows:

operating frequency and bandwidth: x frequency band f_-35～f₈₀；

Loss: less than or equal to 0.3 dB;

coupling degree: 10dB plus or minus 1 dB;

input and output standing wave ratio: VSWR is less than or equal to 1.3;

the standing wave of the directional coupler can ensure the reliability of the standing wave of the whole machine, the loss is small, the excitation signal with the maximum capacity is provided for promotion, and the requirements of all indexes are effectively ensured at high and low temperatures.

b. Push-stage amplifier

The amplifier is used for inputting small signals and respectively outputting two paths of large signals. The method has the characteristics of high conversion speed, low power consumption, high output power and the like. Has the functions of power division and amplification, and the isolation between the two paths is high.

When the input power of the push-stage amplifier 2 is +5dBm, the output power is 33dBm, and the high-temperature and low-temperature gains are changed by +/-1 dB. By changing the input power, the high and low temperature of the output power can be ensured to be more than or equal to 33 dBm.

c. Final power amplifier

The final power amplifier is designed to have 6 stages and the first stage as two paths of isolators, and the insertion loss is less than 0.2 dB;

the second stage is two power dividers, and the insertion loss is 0.2 dB;

the third stage is a 4-path 30W GaN MMIC power amplifier, the power gain is not less than 18dB, and the single-path work is performed

The rate is more than or equal to 45.5 dBm;

the fourth stage is two paths of synthesizers, and the insertion loss is 0.2 dB;

the fifth stage is two-way isolators, and the insertion loss is less than 0.2 dB;

the sixth level is a microstrip output component, and the insertion loss is less than 0.2 dB;

when the input pulse power is +32dBm, the power input to the third stages A4, A5, A6 and A7 is 30dBm after passing through the first stage power divider and the second stage isolator. The 4 amplifiers in the third stage are in a saturated working state, the saturation compression is 2dB, and the single-path power is more than or equal to 45.4 dBm;

the output power is more than or equal to 47dBm (not counting the synthesis efficiency) through the fourth-stage synthesizer, the fifth-stage isolator and the sixth-stage coaxial output;

the pulse power supply control circuit adopts a large-capacity energy storage capacitor, a high-speed MOSFET driver and an MOSFET power switch, the requirements on the turn-on and turn-off time of a power supply are guaranteed, the response time of the power supply is within 100ns, and if the same-period modulation sleeve pulse is added in a radio frequency excitation signal, the response speed of the rising time and the falling time is about 15ns and is superior to the index requirement of the switch rising/falling time of 300ns provided before.

The pulse power supply signal flow is as follows: external synchronous signals TTL are input at high level and pass through a high-speed MOSFET driver, and then the MOSFET power switch grid is triggered, so that each power amplifier tube of a microwave channel works; when TTL is low level, the excitation triode has no signal amplification, the high-speed MOSFET driver does not work, no high level exists, the grid electrode of the MOSFET power switch has no trigger signal, each power amplification tube of the microwave channel is in a cut-off state, and the microwave channel stops working.

When the pulse power supply is normally input, the working voltage of the high-speed MOSFET driver is normal, and a signal can be input to carry out system work; when a certain group of pulse power supplies are abnormal, the protection circuit does not have output voltage to limit the pulse signal to be in a low level, the pulse driver cannot be opened, and the voltage provided for the high-speed MOSFET driver is not output, so that the final MOSFET power switch is in a disconnected state, each power amplification tube of a microwave channel is protected, and the device is prevented from being damaged due to the fact that grid voltage is not applied.

To sum up, the utility model has the characteristics of small, that power consumption current is little, the timesharing is exported, the reliability is high, is applicable to the high-power detection of various same frequency band radar systems, has the undercurrent consumption, and the advantage such as function integrated level height, but the wide application is in military and civilian equipment such as airborne, carrier-borne, on-vehicle and missile-borne.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

An X-band dual-channel transmitter, characterized in that: the circuit comprises a directional coupler (1), a push-stage amplifier (2) and two switchable time-sharing output channels which are sequentially connected, wherein each output channel is sequentially provided with an isolator (3, 4), a one-to-two power divider (5, 6), a final-stage power amplification circuit group (7, 8, 9, 10), a combiner (11, 12), isolators (13, 14) and a coupler (15).
2. The X-band dual channel transmitter of claim 1, wherein: and the two paths of time-sharing output channels are switched and output according to the high and low levels of the control signal.
3. The X-band dual channel transmitter of claim 1, wherein: the specification of the directional coupler (1) is as follows:

operating frequency and bandwidth: x frequency band f_-35～f₈₀；

Loss: less than or equal to 0.3 dB;

coupling degree: 10dB plus or minus 1 dB;

input and output standing wave ratio: VSWR is less than or equal to 1.3.
4. The X-band dual channel transmitter of claim 1, wherein: when the input power of the push-stage amplifier (2) is +5dBm, the output power is 33dBm, and the high-temperature and low-temperature gain changes by +/-1 dB.
5. The X-band dual channel transmitter of claim 1, wherein: the output end of the isolator on each output channel realizes radio frequency output through a microstrip output assembly, and the insertion loss of the microstrip output assembly is less than 0.2 dB.
6. The X-band dual channel transmitter of claim 1, wherein: each amplifier of the final power amplification circuit group adopts a 30W GaN MMIC power amplifier, the power gain is more than or equal to 18dB, and the single-path power is more than or equal to 45.5 dBm.