2013/05/22 by Shan Gao, Sheng Sun, Gao, S. S. +1
Engineering · #Advanced Antenna and Metasurface Technologies #Electromagnetic Compatibility and Noise Suppression #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Microwave Engineering and Waveguides
paper · pdf · doi:10.48550/arxiv.1305.6520
openalex publication_date 2013/05/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
This paper presents a novel design procedure for wideband microstrip bandpass filters with non-equiripple filtering frequency responses and low sensitivity. Different from the traditional Chebyshev transfer function filters, the return loss zeros of the proposed non-equiripple filters can be redistributed within the operating passband. For the industrial applications, the proposed filters have a reduced sensitivity to manufacturing errors and exhibit good tolerance control for both specified bandwidth and maximum in-band reflection loss. By deriving the transfer functions, a synthesis approach with a set of non-linear equations can be established according to the specifications such as the bandwidth and predetermined reflection lobes. Without performing any post optimization in the full-wave simulation, the non-equiripple synthesized results have less sensitivity and fractional bandwidth (delta) error in comparison with those obtained from traditional Chebyshev transfer functions with equiripple frequency responses. As design examples, a four-pole bandpass filter with delta=60% and a five-pole bandpass filter with delta=82.5% are designed and fabricated. Measured results show a good agreement with those obtained from the prediction, without any tuning or adjustments.