Method for improving performance indexes of directional coupler
A technology for directional couplers and indicators, which is applied to waveguide devices, electrical components, connecting devices, etc., can solve problems such as impact, system performance index impact, and reduce the accuracy of directional couplers, so as to achieve improved performance, strong practicability, and improved The effect of performance indicators
Inactive Publication Date: 2012-07-11
CHENGDU AIRCRAFT INDUSTRY GROUP
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Problems solved by technology
[0012] All in all, when there is a mismatch in each port branch of the directional coupler, the reflected wave will be input to the port and then distributed to other ports through the directional coupler, which will seriously reduce the accuracy of the directional coupler and affect the performance of the entire system. make an impact
Especially when the directivity of the directional coupler is not good, the impact is more serious
Method used
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[0018] The present invention will be further described below in combination with specific embodiments.
[0019] figure 1 is a schematic diagram of the power flow of the original directional coupler. Assuming that the directional coupler is a reciprocal symmetrical structure, the input power is P(dBm), the coupling degree is C(dB), and the isolation degree is I(dB), then it is transmitted to The power at the coupled port is P-C(dBm).
[0020] However, there is always reflection in actual use, and it is impossible to achieve a complete match.
[0021] Suppose there is a load connected behind the straight-through port, and its return loss is RL1(dB), and there is a load connected behind the isolated port, and its return loss is RL2(dB);
[0022] Then the power reflected back by the input power through the through port is P-RL1(dBm) (neglecting the through loss), and then the power coupled to the coupled port through the directional coupler is P-RL1-I(dBm); the input power pass...
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The invention discloses a method for improving performance indexes of a directional coupler, which is characterized in that quantitative-value attenuators are respectively connected in series between a coupling port as well as an isolating port of a directional coupler and a load connected with the directional coupler, the attenuation amounts of the attenuators can be adjusted according to actual needs, and the attenuation amounts of the attenuators connected in series with the two ports can be consistent or inconsistent according to actual situations. By using the method disclosed by the invention, the purpose of improving and increasing the performance indexes of the directional coupler under the premise of not affecting the metering of coupling amount can be achieved, and the problem that the power of each port is bounced to and fro because the standing wave of the load connected with the directional coupler is too large is reduced, therefore, by using the method, the performance of the directional coupler (a universal microwave device) can be greatly improved. The method is simple and easy to operate, and strong in practical applicability.
Description
technical field [0001] The invention relates to a method for improving the performance index of a directional coupler, which belongs to the application field of microwave devices. Background technique [0002] The directional coupler is a microwave device with a wide range of uses. It is an indispensable and important part in various microwave circuits, communication systems, radar systems, and measurement systems. There are many types of directional couplers and various structural forms. , the principles of design methods are also different. Common directional couplers are generally four-port components, one input port and three output ports, and the output ports include straight-through ports, coupled ports and isolated ports. [0003] The input power of the directional coupler is P. In an ideal coupler, no power is transferred to port 4 (the isolated port), and the transfer coefficient S 14 =0. Power supplied to port 1 (input port) is coupled to port 3 (coupled port),...
Claims
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IPC IPC(8): H01P5/18H01P11/00
Inventor 姜文盛李恩吴杰孟莹
Owner CHENGDU AIRCRAFT INDUSTRY GROUP