Dual-Mode Resonator with Modified Dual-Square-Loop for WLAN and WiMAX Quad- Band Filter Design

作者：Liu Ji Chyun^*; Huang Feng Sheng; Kuei Ching Pin; Liu Chin Yen

来源：International Journal of RF and Microwave Computer-Aided Engineering, 2014, 24(3): 332-340.

DOI：10.1002/mmce.20765

• dual-mode
• dual-square-loop

We propose the improved configurations with dual-mode dual-square-loop resonators (DMDSLR) for quad-band bandpass filter (BPF) design. The modified DMDSLR filter employs two sets of the loops. The square loop is designed to operate at the first and third resonated frequencies (2.4/5.22 GHz) and the G-shaped loop is employed at the second and fourth resonated frequencies (3.59/6.6 GHz). The resonant frequency equations of DMDSLR are introduced for simply designing quad-band BPF. Resonant frequencies can be controlled by tuning the perimeter ratio of the square loops. A systematic design procedure with the design map is applied for accuracy design. To obtain lower insertion loss, higher out-of-band rejection level and wider bandwidth of quad-band, the miniaturized DMDSLR with meander-line technique is proposed. The proposed filters are successfully simulated and measured showing frequency responses and current distributions. It can be applied to WLAN and WiMAX quad-band systems.

• 出版日期2014-5