A Capacitive SMD Loaded Dual-Mode Substrate Integrated Waveguide Bandpass Filter

Abstract

The invention relates to a capacitive chip-loaded dual-mode substrate integrated waveguide bandpass filter, which comprises a first layer of metal plate, a first layer of dielectric plate, a second layer of metal plate, a second layer of layer dielectric plate and the third layer of metal plate, and fixedly connected in turn, the surface of the first layer of metal plate is provided with a microstrip to coplanar waveguide feeder structure, the second layer of metal plate includes four capacitive stickers sheet, the third layer of metal plate is fully metal-covered ground, the second layer of dielectric board is opened with a metallized blind hole, the top of the metallized blind hole and the bottom end of the capacitive patch Fixed connection, the bottom end of the metallized blind hole is fixedly connected to the top end of the metal-covered ground, the first layer of dielectric board and the second layer of dielectric board are provided with interconnected metal through holes, the The metal through hole communicates with the first-layer metal plate and the third-layer metal plate. The invention has the characteristics of being more miniaturized and capable of realizing high selectivity.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a dual-mode substrate integrated waveguide bandpass filter loaded by a capacitive patch. Background technique [0002] With the rapid development of wireless communication technology, wireless communication systems put forward higher and higher requirements for the weight, volume, integration and electrical performance of front-end circuits. Microwave filters, as frequency-selective devices, are widely used in front-end circuits of communication systems. Compared with microstrip resonators, substrate-integrated waveguide resonators have a higher quality factor, making substrate-integrated waveguide bandpass filters have smaller in-band insertion loss, so substrate-integrated waveguide filters are used in the front-end of communication systems It has been extensively studied and applied in electrical circuits. [0003] Using dual-mode substrate-integrated waveguide...

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Problems solved by technology

[0003] Using dual-mode substrate-integrated waveguide resonators to design microwave filters can achieve the goal of miniaturization, and dual-mode filters can achieve limited frequency transmission zeros, so it also has the advantage of high selectivity. Dual-mode substrate-integrated waveguide filters can The dual-mode fan-shaped substrate integrated waveguide resonator and the dual-mode square substrate integrated waveguide resonator are designed and implemented. Based on the above dual-mode substrate integrated waveguide filter, although a miniaturized and highly selective microwave bandpass filter can be realized , but for communication systems with stricter size requirements, the size still cannot meet the application requirements. In order to overcome the above deficiencies, a dual-mode substrate integration that is more miniaturized and capable of highly selective capacitive patch loading is proposed. waveguide bandpass filter

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