Design of microstrip bandpass filters with a dual-passband response

This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjus...

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Veröffentlicht in:IEEE transactions on microwave theory and techniques 2005-04, Vol.53 (4), p.1331-1337
Hauptverfasser: Kuo, Jen-Tsai, Yeh, Tsung-Hsun, Yeh, Chun-Cheng
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Yeh, Tsung-Hsun
Yeh, Chun-Cheng
description This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design.
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subjects Band pass filters
Bandpass filters
Bandwidth
Couplings
Dual band
Dual-passband
Frequency
Graphs
Impedance
microstrip circuit
Microstrip filters
Microwave filters
Microwaves
Passband
planar microwave filters
Resonance
Resonant frequencies
Resonator filters
Specifications
Stepped
stepped impedance resonator (SIR)
title Design of microstrip bandpass filters with a dual-passband response
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