Miniaturized Dual-Mode Resonators With Improved Double Square Loop and Inter-Digital Couple for Wlan Dual-Bands

Abstract

A novel dual-mode double square loop resonator (DMD-SLR) for dual-band band-pass filter (BPF) is presented in this paper. The simple meander loop in DMDSLR is studied to improve the performance of the conventional DMDSLR. Significant size reductions over 33% are achieved. In addition, the designed meander-loop DMDSLR filter shows lower insertion loss (2.24 and 2.28 dB), higher rejection level (28/56 dB and 53/36 dB), wider bandwidth (about 8.5% and 28%) at the 2.47 and 5.47 GHz bands, respectively. Two transmission zeros are placed between the two pass-bands and result in a good isolation.

Lumped Dual-Frequency Impedance Transformers for Frequency-Dependent Complex Loads

“…Recently as dual-band microwave components are becoming a trend [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], the demand for dual-frequency impedance transformers has been increasing. Dual-frequency impedance matching were firstly realized between real impedances [17,18].…”