An ultra-compact planar bandpass filter with open-ground spiral for wireless application

• Main Authors: Ma, Kaixue, Yeo, Kiat Seng, Ma, Jianguo, Do, Manh Anh
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2010
• Online Access: https://hdl.handle.net/10356/93081; http://hdl.handle.net/10220/6251
• Institution: Nanyang Technological University

A common via filter is investigated and designed by using a proposed scalable lumped circuit model. The model-based result of the filter agrees well with that of the measurement. An ultra-compact open-ground spiral filter is proposed based on the common via filter. The open-ground spiral resonators are used to design second-order and fourth-order bandpass filters. The filter layouts, which affect filter performance in both passband and stopband, are investigated. The advantages of the open-ground spiral filter include not only its ultra-compact size but also its additional transmission zero points and controllable stopband.