ABSTRACT

This paper presents a high band selectivity tri-band bandpass filter with controllable frequency and transmission zeros. This tri-band bandpass filter is mainly constructed by using two pairs of dual-stubs loaded resonators in a symmetrical structure. Three passbands could be independently controlled to achieve the desired frequency and have transmission zeros created close to the passbands to improve the band selectivity. Three resonant models are provided in the proposed filter to obtain different passband frequencies. The passbands of the designed filter are designed at 1.82, 2.44, and 3.49 GHz, which can be used for global system for mobile communications (GSM), wireless local area network (WLAN), and Worldwide Interoperability for Microwave Access (WiMAX), respectively. The simulated results and measured results of the designed tri-band bandpass filter have a good agreement.

摘要

本文提出了一种具有可控频率和传输零点的高频带选择性三频带带通滤波器。该三带通滤波器主要是通过使用两对对称负载的双短管负载谐振器构成的。可以独立控制三个通带以实现所需的频率，并在通带附近创建传输零，以提高频带选择性。所提出的滤波器中提供了三个谐振模型以获得不同的通带频率。设计的滤波器的通带设计为1.82、2.44和3.49 GHz，可分别用于全球移动通信系统（GSM），无线局域网（WLAN）和全球微波接入互通性（WiMAX）。 。