Compact switchable filter with three state modes using simple microstrip structure. Issue 7 (7th April 2022)

• Record Type: Journal Article
• Authors: Deng, Xida; Dong, Ge; Xu, Kai‐Da
• Is Part Of: Microwave and optical technology letters. Volume 64:Issue 7(2022)
• Page Start: 1162
• Page End: 1169
• Publication Date: 2022-04-07
• Subjects: bandstop filter -- coupled lines -- reconfigurable filter -- switchable filter -- wideband bandpass filter; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.33253
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: This paper presents a compact multifunctional reconfigurable filter based on double coupled‐line structures with three different filtering modes. Three different working modes of the wideband bandpass filter (BPF), bandstop filter (BSF) and wideband filter with single notch can be switched. One prototype of the reconfigurable filter is constructed and measured. For the wideband BPF mode, the 3‐dB bandwidth is 84.5%with in‐band return loss (RL) higher than 21.5 dB and minimum insertion losses (IL) of 0.9 dB, and rejections for the upper stopband is higher than 22.5 dB. For the wideband filter with single notch mode, the 3‐dB bandwidth is 39.7% and 24.9%, with the minimum in‐band IL of 1.13 dB and 1.5 dB, respectively. The maximum rejections between the two bands are 32 dB, and the upper stop band rejections are higher than 19 dB. For the BSF mode, the 3‐dB bandwidth is 29.6%.