A new compact 1D PBG microstrip structure with wider stopband based on semiconductor substrate.

A new type of compact one dimensional (1D) microstrip photonic bandgap (PBG) used for filters is presented. A semiconductor-based structure of a miniature band-stop filter with three cells is simulated, realized, and measured. Basic agreement between the experimental and simulated results have been achieved. The filter with the proposed PBG structure exhibits wide, deep, and steep stop-band characteristics, and also has less loss and ripples in the pass-band. Thus, the new PBG structure can be used for low-pass as well as high-pass filters. The period of the PBG lattice is about (1/5 ∼ 1/4) λe (λe is the guiding wavelength at the center frequency of the stop-band), or 0.08 λ0 (λ0 is the wavelength in air). The filter with the new PBG structure is much easier to fabricate and integrate with other circuits and is more compact than conventional filters. The results in our paper are based on semiconductor substrate and can be applied directly in MIC and MMIC. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 150–152, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11153 [ABSTRACT FROM AUTHOR]