Suspended Stripline Cavity Combiner Loaded by Uniform Impedance Stubs

Abstract

The suspension strip line cavity combiner with uniform impedance branch load of the present invention comprises a metal cavity, a dielectric substrate in the metal cavity and a suspension strip line circuit, and the suspension strip line circuit includes a low-pass filter circuit, a high-pass filter circuit and a combiner. The low-pass filter circuit consists of a single π1-type structural unit, and a uniform impedance open-circuit stub loaded on the low-frequency transmission line between the π1-type structural unit and the combining circuit, so that two zeros of the π1-type structural unit are generated in the low-frequency band. The third zero point on the side; the high-pass filter circuit contains two cascaded π2-type structural units, and the pole of the π2-type structural unit is located between its two zero points. The beneficial effects of the present invention are as follows: by adjusting the parameter value of the π-type structural unit, the position of the zero-pole point can be flexibly regulated, thereby producing good roll-off characteristics; in the design, non-equal-length uniform impedance stub loading and non-equal-length main line lengths are used The size of the circuit can be reduced, making the circuit simpler and lighter.

Description

technical field [0001] The invention relates to the technical field of combiners, in particular to a combiner with a suspended strip line cavity loaded by unequal-length uniform impedance stubs. Background technique [0002] At present, the known microstrip combiners loaded with open stubs of radio frequency signals have mostly the same width as the stubs and the main line, and the wiring area is relatively large, which is not suitable for the miniaturization of combiners in the base stations of most mobile communication systems. , at the same time, the open-circuit stub impedance of many suspended strip cavity combiners is non-uniform, and the design is relatively complicated. [0003] After searching, it is found that the patent CN 208298987 U discloses a dual-frequency cavity combiner, which includes a fifth-order interdigitated bandpass filter and a suspended stripline low-pass filter. The two filters are connected. However, its disadvantages are: the high-frequency an...

AI Technical Summary

Problems solved by technology

However, its disadvantages are: the high-frequency and low-frequency channels adopt different design methods, so the two-way debugging methods are different, so the design is more complicated, and the debugging cost is increased; the partition wall between the two channels is connected with the shell, and the processing Compared with this design, it is more complex

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