Single-Layer Dual-Band Bandwidth-Enhanced Filtering Phase Shifter With Two Different Predetermined Phase-Shifting Values

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 68; no. 1; pp. 236 - 240
• Main Authors: Dong, Qingxiang, Wu, Yongle, Chen, Weijuan, Yang, Yuhao, Wang, Weimin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: bandpass filter (BPF); Bandwidths; Delay lines; Delays; Dual band; filtering function; Filtering theory; Filtration; Landline; Network analysis; phase shifter (PS); Phase shifters; single-layer; Transmission lines
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2020.3008532

In this brief, a dual-band bandwidth-enhanced filtering phase shifter is proposed, which can achieve two different predetermined phase-shifting values with the single-layer structure. The proposed phase shifter is composed of two stub-loaded transmission lines (SLTLs) and two delay lines. The loaded stubs provide three transmission zeros to realize dual-band working and filtering function. Based on the even- and odd-mode network analysis, the theoretical formulas can be obtained. According to the theoretical analysis and design method, several dual-band phase shifters are achieved. A dual-band phase shifter example, which can provide the phase shift of 90° and 270° in two bands, is simulated, manufactured, and measured for demonstration.