Filter circuit and filter

• Main Authors: SUN CHENGLIANG, SUN BOWEN, HU HAOYU, YI KANG, ZHANG JINXIAN, ZHAO KUNLI, LUO TIANCHENG
• Format: Patent
• Language: Chinese; English
• Published: 21.11.2023
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The utility model provides a filter circuit and a filter, and relates to the technical field of filtering, the filter circuit comprises a first port, a second port, a first resonance branch, a second resonance branch and a third resonance branch, the first port is connected with the second port through the first resonance branch, and the second port is connected with the third resonance branch through the second resonance branch. The first port and the second port are grounded through a second resonance branch and a third resonance branch respectively, and each of the first resonance branch, the second resonance branch and the third resonance branch at least comprises two resonators with different resonance frequencies, so that near stop band zero points at the left end and the right end approach a pass band; compared with a traditional circuit structure filter, the rectangular coefficient is improved, namely the roll-off effect is effectively improved. 本实用新型提供一种滤波电路及滤波器，涉及滤波技术领域，该滤波电路包括：第一端口、第二端口、第一谐振支路、第二谐振