A regular hexagonal ring-type microstrip double-pass charged tuned filter

Abstract

The invention provides a regular hexagonal annular microstrip line double-pass charged tuning filter, which includes a dielectric substrate and a hexagonal annular microstrip line structure on the upper surface of the dielectric substrate; the regular hexagonal ring includes an outer ring and an inner ring, A pair of 50 ohm input and output microstrip lines, a pair of V-shaped microstrip lines, an opening on one side of the regular hexagonal outer ring, an opening on the left and right sides of the regular hexagonal inner ring, and four pairs of parallel wires are drawn from the opening. Microstrip lines, two pairs of parallel microstrip lines point to the center of the inner ring, and the microstrip line that is far away from the 50 ohm input and output microstrip lines is connected to the external bias circuit, and the other two pairs of parallel microstrip lines are far away from the inner ring. The center of the ring is connected to the outer ring. When different bias voltages are used, the first passband of the filter is continuously adjustable under the action of the varactor diode, and the second passband remains unchanged. The filter of the invention has the characteristics of small size, low insertion loss, continuously adjustable center frequency, high out-of-band suppression, fast tuning speed, convenient tuning and the like.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a regular hexagonal ring microstrip line double-pass charged tuning filter. Background technique [0002] With the rapid development of wireless communication technology, spectrum resources are more and more densely occupied, resulting in increasingly prominent problems of spectrum congestion. In order to more effectively utilize limited spectrum resources, technologies such as spread spectrum and frequency hopping are widely used. The electronically 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 signal of the unnecessary frequency. It needs to have high selectivity, low insertion loss, and low in-band fluctuation , high sensitivity and large dynamic range. [0003] At present, microstrip tunable filters, such as f...

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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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