Miniaturized Dual-Mode Dual-Band BPF Using a Single Square Patch Loaded Stepped-Impedance Square Open Loop Resonator
Keywords:
Bandpass Filter (BPF), dual-band, dual-mode, open loop resonator, patch resonatorAbstract
This letter presents a dual-mode dualband Bandpass Filter (BPF) using a single Square Patch Loaded Stepped-Impedance Square Open Loop Resonator (SPLSISOLR). The first four Transmission Poles (TPs) of SPLSISOLR can be tuned freely. A pair of high-impedance microstrip lines coupled with the resonator are employed to excite these four TPs to build up a dual-mode dual-band BPF, with two TPs in each passbands. The tapped point of the 50 ? feeding lines can be freely sliding on the high impedance microstrip lines, which increases the design freedom of external quality factor of two passbands. To validate the proposed method, a dual-band filter centered at 1.79/5.42 GHz with -3 dB fractional bandwidth of 4.5%/22.5% and compact size of 0.15?g × 0.14?g are designed. The fabricated filter has the merits of high band-to-band isolation, wide stopband, DC block and simple design procedure.
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References
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