A Novel Approach for Realizing 2.4/5.2 GHz Dual-Band BPFs using Twin-Spiral Etched Ground Structure

Abstract

This paper proposes a simple approach for realizing a dualband response bandpass filter (BPF) comprising two strip feed lines on the upper layer and a twin-spiral etched ground structure (EGS) on the lower layer. It is shown that by moving the two strip feed lines from the center of the EGS toward the upper-left and lower-right corners of the EGS unit, respectively, a 5.2-GHz passband can be excited in addition to the original 2.4-GHz passband. Moreover, by carefully controlling a dimension of the EGS, the second passband can be tuned in such a way as to realize a 2.4/5.7 GHz BPF. The experimental results show that the dual-band 2.4/5.2 GHz BPF has a good passband selectivity and an excellent out-of-band noise suppression capability. Consequently, the device provides an ideal solution for both Industrial-Scientific-Medical (ISM) and Wireless Local Area Network (WLAN) applications.

Design and Fabrication of a Compact Quad-Band Bandpass Filter Using Two Different Parallel Positioned Resonators

“…Multi-band bandpass filters with wide bandwidth, high selectivity, and small insertion loss have recently become essential requirements for next-generation wireless communication systems [1][2][3][4][5][6][7][8]. In the past, the basic method for designing multi-band bandpass filters consisted of using several resonators that were responsible for each resonant band.…”

Dual Passband Filter Using Hybrid Microstrip Split Ring Resonators and Coplanar Waveguide Quarter Wavelength Resonators

“…For the initial investigations, dual passband filter has been taken much more attention. And several design approaches have been proposed [3][4][5][6]. In [3] and [4], dual passband filters are realized by paralleling connection of two bandpass filters with different center frequencies.…”