Design of Multi-Band Filters Using Parallel Connected Topology

• Main Authors: S. Cheab, P. W. Wong, S. Soeung
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2018-04-01
• Series: Radioengineering
• Subjects: dual-band; dual-mode; multi-band filter; parallel connected topology; stepped-impedance resonator (SIR); transmission zero (TZ); triple-band
• Online Access: https://www.radioeng.cz/fulltexts/2018/18_01_0186_0192.pdf

This paper presents the design of multi-band filters using parallel connected topology. The resonator in each branch is the dual-mode resonator which provides two resonant modes per passband for miniaturization. The coupling values of the resonator are obtained by mapping the filtering function of the dual-mode resonator to the second order Chebyshev polynomial. The control of the filter parameters, such as pass-band bandwidths and band separation, is addressed. Dual-band and triple-band filter prototypes are designed and fabricated to validate the proposed concept. The measured results show good agreement with the simulations.