Cross-Coupled Line Bandpass Filter Based on Modified Parallel-Coupled Line Structure

This paper presents a study of narrow bandwidth the bandpass filter with cross-coupled line structure. structure was designed to have good selectivity transmission zeros and simple design. Since has cross shape, cross-coupling between resonators consequently occurs. interferes passband filter. Optimization in size coupled lines done minimize interference. Rogers RT/duroid 5880 used as substrate fabricate verify proposed As result, fabricated an 80 MHz 3 dB operating frequency ranges from 2.97 GHz 3.05 GHz. The is reduced by 20 % specification.It shows that can yield bandwidth. Based on bandwidth, center shifted 0.33 above specification. Meanwhile, return loss insertion successfully comply required specifications. In conclusion, be applied S-Band applications require