Design of a compact microstrip ultra‐wideband bandpass filter at P‐band

This letter presents the accurate design of a compact ultra-wideband bandpass filter with a bandwidth from 400 to 900 MHz. The measured results demonstrate an insertion loss of <0.98 dB and a return loss of 14.9 dB. Furthermore, the theoretical, simulated, and experimental performances are well matched. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2797–2799, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24743