Electric tunable band-pass filter based on half-module substrate integrated waveguide

Abstract

The invention discloses an electric tunable band-pass filter based on a half-module substrate integrated waveguide. As an ideal magnetic wall is arranged in the middle of the substrate integrated waveguide, and a power line is parallel to symmetrical central lines of a first sheet metal, the substrate integrated waveguide can be divided into two parts from the ideal magnetic wall without changing the field mode, the situation that the substrate integrated waveguide is provided with the same performances can be ensured, and the size of a device formed by the substrate integrated waveguide can be greatly decreased; in addition, the insertion loss can be effectively reduced to increase Q value through a ground connection hole; besides, through a first blocking capacitor, a second blocking capacitor, a third microwave transmission line, a fourth microwave transmission line, and the substrate integrated waveguide forming a half module, direct current feed can be effectively loaded, and frequency adjustment is facilitated; through a first variable capacitance and a second variable capacitance, a passband of the filter based on the half-module substrate integrated waveguide performs frequency adjustment. The electric tunable band-pass filter is suitable for being popularized and applied in the field of radio frequency devices.

Description

technical field [0001] The invention belongs to the field of radio frequency devices, in particular to an electrically tunable bandpass filter based on a half-mode substrate integrated waveguide. Background technique [0002] With the rapid development of modern microwave and millimeter wave circuit systems, its functions are becoming more and more complex, its electrical performance indicators are getting higher and higher, and its volume is getting smaller and lighter. Low-cost, high-performance, high-yield microwave and millimeter wave technologies are critical to the development of commercial low-cost microwave and millimeter wave broadband systems. Substrate Integrated Waveguide (SIW) technology is a new waveguide structure proposed in recent years that can be integrated into a dielectric substrate with low insertion loss, low radiation, and high power capacity. It can Effectively realize passive and active integration, miniaturize the microwave and millimeter wave sys...

AI Technical Summary

Problems solved by technology

In some filters based on substrate integrated waveguide, there are problems such as large volume, low Q value, wide adjustment range, and inconvenient loading of adjustment voltage.

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