A TRI-BAND BANDPASS FILTER REALIZED USING TRI-MODE T-SHAPE BRANCHES

A Tri-band Bandpass Filter Realized Using Tri-mode T-shape Branches

In this paper, we present a tri-band filter design using tri-mode T-shaped branches connected by λ/4 transmission lines. By analyzing the input admittance of a T-shape branch with commensurate electrical lengths, three resonant modes with two transmission zeros between are found and design formulas are derived. The filter can be regarded as a combination of three bandpass filters with only one ...

Tri - band Microstrip Bandpass Filter Using Dual - Mode Stepped - Impedance Resonator

© 2013 ETRI Journal, Volume 35, Number 2, April 2013 This letter presents a compact dual-mode tri-band bandpass filter by using a short-circuited stub-loaded stepped-impedance resonator (SIR) and a short-circuited stub-loaded uniform impedance resonator. Also, a hairpin SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a short-ci...

Investigation of Tri-Band Bandpass Filter Using Impedance and Admittance Inverters

Novel Compact Tri-Band Bandpass Filter Using Multi-Stub-Loaded Resonator

In this paper, a compact tri-band bandpass filter (BPF) using multi-stub-loaded resonator with controllable frequencies is presented. The multi-stub-loaded resonator consists of a main transmission line, two open stubs and a short stub. Characterized by using evenand odd-mode analysis, it is found that the resonator consists three modes, and the modes can be controlled individually, which enabl...

Novel Tri-band Bandpass Filter Using Stub- Loaded Short-ended Resonator

This paper presents a tri-band bandpass filter (BPF) using a novel stub-loaded resonator. Different from other stub-loaded resonator, this resonator utilized a short-ended main transmission line and a centerly-loaded open stub. The resonator is theoretically analyzed. The first three resonant frequencies can be individually adjusted and this enables the convenient designs of tri-band BPFs. For ...