Regular hexagon ring-shaped microstrip line dual-pass-band electrically tunable filter

Abstract

The invention provides a regular hexagon ring-shaped microstrip line dual-pass-band electrically tunable filter. The filter comprises a dielectric substrate and a hexagon ring-shaped microstrip structure arranged on the upper surface of the dielectric substrate, wherein regular hexagon rings include an outer ring, an inner ring, a pair of 50-Ohm input and output microstrip lines and a pair of V-shaped microstrip lines, an opening is formed in one side of the regular hexagon outer ring, an opening is formed in each of the left and right sides of the regular hexagon inner ring, four pairs of microstrip lines are led out of the openings, two pair of parallel microstrip lines face towards the center of the inner ring, an external biasing circuit is connected to one microstrip line relatively far from the 50-Ohm input and output microstrip lines, and the other two pairs of parallel microstrip lines are far from the center of the inner ring and are connected to the outer ring. When differentbias voltages are adopted, a first pass band of the filter is continuous and adjustable, and the second pass band remains unchanged. The regular hexagon ring-shaped microstrip line dual-pass-band electrically tunable filter has the characteristics of small volume, low insertion loss, continuous and adjustable center frequency, high out-of-band rejection rate and tuning speed, convenience in tuning and the like.

Description

technical field [0001] The invention relates to the technical field of microwave and millimeter waves, in particular to a double-pass band electric tuning filter of a regular hexagonal ring microstrip line. Background technique [0002] With the rapid development of wireless communication technology, the occupation of spectrum resources is becoming more and more intensive, resulting in the increasingly prominent problem of spectrum congestion. In order to utilize the limited spectrum resources more effectively, technologies such as spread spectrum and frequency hopping are widely used. The electrically tuned filter is the core component of the high-frequency front end of the frequency hopping receiver. Its function is to select the working frequency signal of the receiver and suppress the unwanted frequency signal. It needs to have high selectivity, low insertion loss, and low in-band fluctuation. , high sensitivity and large dynamic range. [0003] At present, microstrip ...

AI Technical Summary

Problems solved by technology

[0003] At present, microstrip tunable filters, such as frequency hopping filters, mainly adopt comb-shaped and interdigitated-type structures. The filters of these structures have a single coupling method and a large volume, which cannot meet the needs of diversification and Miniaturization and other requirements

However, filters with new structures such as 1 / 4 wavelength resonators and 1 / 2 wavelength resonators are folded to form a cross-shaped or E-shaped structure. Although it is beneficial to the miniaturization of the filter, the coupling structure of this type of filter Inflexible, which greatly limits the development of filters

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