A Compact Bandpass Filter Using A T-Shaped Loaded Open-ended Stub Resonator

Abstract

This paper proposes a compact bandpass filter using a loaded open-ended T-shaped stub. The open-ended T-shaped stub is loaded with vertical resonators placed across. The key advantage of using vertical resonators in the design is the simplicity and low insertion loss it provides. The structure used is an open-ended stub attached on one end to the transmission line (λ/2) to form a T-shaped resonator (λ/4) having vertical resonators placed across. The vertical resonator position alters the position at which the transmission zero occurs. A pair of the T-shaped resonator is placed on parallel sides of the feed line. The proposed filter is designed with the aid of Computer Simulation Technology Microwave Studio Software. The proposed concept is verified by designing filters with four different vertical resonator positions. The filter possesses a good rejection and low insertion loss of < 2dB with Chebyshev response. This filter is suited for modern-day communication applications since it shows good rejection of out of band signals.

Enhanced Bandwidth of Band Pass Filter Using a Defected Microstrip Structure for Wideband Applications

“…Bandpass filters that possess high selectivity in the passband are needed to suit modern communication applications. [5].…”

Microwave Bandpass Filter Integrated with Notch Response for Wide-band Applications

“…The existing radio communication signal within the wideband spectrum will affect the accuracy of data reception for wideband system, thus decreasing its performance and introducing more losses in the system. Therefore, various studies have been conducted in order to design a microwave filter that is capable to eliminate the interference of other radio signals within the desired spectrum frequency (tunable filters) [1]- [4]. In [5], two quarter-wavelength open-circuited stubs technique is implemented to produce the proposed notch band in the UWB bandpass microstrip filter.…”