volume | PIER Journals

2016-05-11

Design of Dual-Band Filters with Individually Controllable Passband Responses and Orders

Xiaofeng Sun,

Dr. Xiaofeng Sun

School of Electrical and Electronic Engineering

Nanyang Technological University

Singapore

Homepage

Eng Leong Tan

Dr. Eng Leong Tan

School of Electrical and Electronic Engineering

Nanyang Technological University

Singapore

Homepage

Progress In Electromagnetics Research B, Vol. 68, 17-33, 2016

doi:10.2528/PIERB16032310 | Google Scholar

Abstract

This paper presents a novel design of dual-band filters with individually controllable passband responses and orders. Besides the center frequency and bandwidth, the response and order of each passband can be different and controlled individually. The dual-band filter is formed by synthesizing each filter element (resonator, inverter) one by one, exploiting the corresponding individual single-band filters design tables/formulas for different prototype responses and orders. Trisection stepped-impedance resonators (TSSIR) are adopted with novel considerations as dual-band resonators, whose additional design parameters could help to realize the required in-band responses (resonances, slope parameters) and improve simultaneously the out-of-band performances (transmission zeros of TSSIR). Furthermore, they can be used to design a dual-band filter with far separation between two passbands. Meanwhile, stepped-impedance inverters are chosen as dual-band inverters with novel additional conditions to obtain symmetric passbands, which can also provide different inverter immittance parameters J/K at two center frequencies when the response or order of each passband is different. To illustrate the two passbands being controlled individually, two dual-band filters with different orders and responses are demonstrated.

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Xiaofeng Sun, and Eng Leong Tan, "Design of Dual-Band Filters with Individually Controllable Passband Responses and Orders," Progress In Electromagnetics Research B, Vol. 68, 17-33, 2016.
doi:10.2528/PIERB16032310

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