Optimizing band elimination filter

Abstract

The invention relates to an optimizing band elimination filter which comprises a body and a cover plate. Resonant cavities are formed in one side, adjacent to the cover plate, of the body, and harmonic oscillators are arranged inside the resonant cavities. An input terminal and an output terminal are respectively arranged on two opposite side walls of the body, a groove is formed in the cover plate, and the groove is in one surface, adjacent to the cover plate, of the body. Coupling transmission lines are arranged inside the groove, and two ends of the coupling transmission lines are respectively connected with the input terminal and the output terminal. Taps are arranged on the transmission lines, the number of the taps is equal to that of the resonant cavities, and the taps stretch into corresponding resonant cavities in an each to each mode. The optimizing band elimination filter is characterized in that lengths of the transmission lines between two adjacent harmonic oscillators are not equal to one fourth of the wavelength of a center frequency, and the lengths of the transmission lines between two adjacent harmonic oscillators are all in equal. The optimizing band elimination filter is small in loss, and high in output power, can prevent the situations that output signals lack fidelity and users can hardly receive the signals from occurring, and is suitable for wireless communication base stations.

Description

technical field [0001] The invention relates to a filter. Specifically, it is an optimized RF / microwave band-stop filter for wireless communication base stations. Background technique [0002] At present, the band rejection filters used in wireless communication base stations are all traditional filters. This traditional filter includes a body and a cover plate, a resonant cavity is provided on the side of the body adjacent to the cover plate, and a resonant oscillator is arranged in the resonant cavity. There are input terminals and output terminals on the opposite side walls of the body. There is a groove on the cover plate. The groove is on the side of the body adjacent to the cover plate. There is a coupling transmission line in the groove. The input terminal is connected to the output terminal. There are taps on the transmission line, the number of the taps is equal to the number of the resonant cavities, and the taps extend into the corresponding resonant cavities o...

AI Technical Summary

Problems solved by technology

The response curve of this filter is shown in figure 2 Curve 1 in the curve, it can be seen from the curve that this filter is not optimized, and the slopes of its low-frequency end and high-frequency end are small, which makes the filter loss larger, the output power is low, and the output The signal is distorted and difficult for users to receive

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