A rectangular waveguide based te 20 mode power splitter

Abstract

The invention discloses a TE based on rectangular waveguide 20 The power divider of the mode is applied in the field of microwave devices. To solve the problem of poor isolation between the microstrip branch ports of the existing hybrid power divider of the rectangular waveguide and the microstrip line, the present invention adopts the method of 20 The microstrip probe inserted at the position of the electric field valley of the mode, the microstrip probe does not couple with the waveguide signal, and can realize the absorption of the input signal of the microstrip probe at both ends, so as to achieve the purpose of port isolation; adopt the present invention The design not only improves the overall performance index of the waveguide-microstrip hybrid power splitter; the circuit form of the isolation terminal is simple and compact, and the structure processing and assembly are convenient.

Description

technical field [0001] The invention belongs to the field of microwave devices, in particular to a high-isolation power divider technology. Background technique [0002] Electromagnetic waves with a frequency higher than 300MHz are generally defined as microwaves, which are widely used in communications, radar, electronic countermeasures, telemetry and remote sensing, industrial production and other fields. Power divider is one of the most widely used devices in microwave systems. Its main function is to divide microwave signals into two or more coherent signals with different power levels, and at the same time, it can also synthesize multiple microwave signals with different powers into one output. . During the whole process, the frequency of the microwave signal does not change, only the amplitude and phase change. [0003] There are various circuit forms of the power divider, such as Wilkinson bridge, Lange bridge, branch line bridge, T-junction, magic T, etc. Accordin...

AI Technical Summary

Problems solved by technology

However, due to the lack of isolation ports in this hybrid power divider of rectangular waveguide and microstrip line, the isolation between microstrip branch ports is theoretically only 6dB, which is difficult to apply to phased array feeder network, balanced frequency mixing, and high power synthesis. In circuits that have high requirements for channel-to-channel isolation (usually ≥15dB)

[0004] The existing hybrid power divider for rectangular waveguide and microstrip line uses two microstrip probes inserted into the waveguide, which are respectively located in the wide waveguide TE 20 The position of the strongest electric field in the mode realizes the high-efficiency conversion of the signal between the waveguide and the microstrip line. At the same time, because two microstrip probes are inserted and are symmetrical, the radio frequency signal in the wide waveguide is divided into two channels respectively. Into the microstrip line; In the circuit performance of the power divider, in addition to the power distribution characteristics mentioned above, it is often necessary to have good isolation between the distributed ports, that is, it is required that the RF signals of the two microstrip probes cannot enter each other's microstrip lines; otherwise, because the input signals of the two microstrip probes will be coupled to each other, the purpose of isolation cannot be achieved.

[0005] Existing known related technologies for improving isolation, for example, a patent application with application number 202010380303.6 discloses a method and device for increasing the isolation between multiple radio frequency channels. For the situation where multiple channels are designed on one PCB board, By adding a microstrip resonant structure between the radio frequency channels, using the characteristics of the microstrip resonant resonant cavity, absorbing the radio frequency signal leaked between the channels, reducing the energy of the leaked signal, so as to achieve the effect of improving the isolation between channels; but the patent uses physical space isolation The way to increase the isolation is only for blocking the signal leaked into the space, and it is not suitable for the transmission isolation of the power divider circuit, and the improvement of the isolation effect is limited

Images