Abstract
This paper presents a broadband band-pass filter with cross-coupled line structure. The cross-coupled line structure is composed of the parallel coupled lines and an open stub. It can be analyzed by the odd- and even-mode method due to its symmetric structure. There are three transmission poles in the passband and two transmission zeros out of passband. Then, the influence of the impedance parameters on the transmission zeros and transmission poles are analyzed. Then, the physical parameters of the proposed band-pass filter are given. And using HFSS for simulation and optimization, the final insertion loss and return loss of filter are obtained. The simulation and measurement results are in good agreement, which validates the design idea.
Highlights
Band-pass filters (BPFs) with high frequency selectivity and out-of-band rejection levels are intensively required in the modern wireless communication systems
Xu proposed a broadband band-pass filter composed of the coupled lines and a cross-shaped resonator, which improves the frequency selection characteristics of the band-pass filter by introducing a transmission zero point [2]
Cheng proposed a broadband band-pass filter based on parallel coupled lines and cross-shaped resonators. e p-i-n diodes are used as the tuning elements, which can implement three reconfigurable bandwidth states [4]
Summary
Band-pass filters (BPFs) with high frequency selectivity and out-of-band rejection levels are intensively required in the modern wireless communication systems. By cascading two cross-shaped resonator structures, a compact ultrawideband band-pass filter is designed [1]. Xu proposed a broadband band-pass filter composed of the coupled lines and a cross-shaped resonator, which improves the frequency selection characteristics of the band-pass filter by introducing a transmission zero point [2]. In [3], a novel band-pass filter with a T-shaped structure is proposed. E position of the transmission zeros can be adjusted to achieve high selectivity of the band-pass filter. Cheng proposed a broadband band-pass filter based on parallel coupled lines and cross-shaped resonators. In [5], the filter is based on the cross-shaped resonator structure with terminal short circuit. A wideband BPF based on a novel single cross-coupled line resonator is presented.
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