Dual-band dielectric resonator bandstop filters

Abstract

This article presents the design and implementation of a new asymmetric dual‐band bandstop filter using TE01δ mode dielectric resonator (DR) technology. The coupling matrix is generated by frequency transformation technique applied to advance filtering functions for direct‐coupled asymmetric dual‐band bandstop filter in cul‐de‐sac configuration. The proposed approach provides control of all the major parameters such as center frequencies, intercavity couplings, and input/output couplings of filter independently in both the designated bands. The dual‐band DR filters (2 × 2) pole, with return loss = 15 dB and percentage rejection bandwidth of 1.6 and 0.6% in two bands, at 9.96 and 10.15 GHz, respectively, are designed, built, and tested. The measured and simulated results are in good agreement over the desired band. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:282–288, 2015.

A Parallel Connected Hybrid Microstrip-Substrate Integrated Waveguide Bandstop Filter

“…Equations ( 3)-( 13) have been used in the design of the bandstop through an integrated microstrip-substrate waveguide [11], [18]. The center frequency of the PCHM-SIW bandstop filter is formulated as ω 0 in (3)…”

“…In the literature, various techniques such as substrate integrated waveguide (SIW) microstrip structure [2], dielectric resonator [3], liquid crystal (LC) material [4], defective ground plane (DGS) [5], coaxial resonator [6], RF MEMS switches [7], and open-circuited shunt stub [8] are applied to produce a band stop filter. The focus has been on the SIW architecture because of its easy integration, low cost, expandability, and efficient high-frequency characteristics.…”

Independently controllable dual‐band filter using single quad‐mode silver‐loaded dielectric resonator

“…The dielectric resonators (DRs) have been extensively applied in modern wireless communication systems such as cellular base station and satellite payloads, principally owing to their high-unloaded quality factor (Q u ), low loss, and superior temperature stability. [1][2][3][4] DR possesses numerous resonant modes and they can be used for dual-/multi-mode resonators and filter designs, which are sought due to the benefit of size reduction for wireless applications. [5][6][7][8] As the evolving of wireless communication, the RF front end operating at dual-or multi-band is highly desired because it can simplify the system architecture.…”