Title :
A Low-Loss Voltage-Controlled Analog Phase-Shifter Using Branchline Coupler and Varactor Diodes
Author :
Gupta, Ishant ; Tomar, Raghuvir ; Bhartia, Prakash
Author_Institution :
LNM Inst. of Inf. Technol., Jaipur
Abstract :
This paper proposes a new type of continuously tunable voltage-controlled analog phase shifter for radio frequency and microwave-frequency applications. The design uses a branchline coupler and two varactor diodes. The concept has been tested at 900 MHz using FR4 dielectric material using thin-film microstrip technology. The measured phase shift variation is 115 degree over the entire range of the control voltage. The measured insertion loss is typically better than 1.5 dB and the measured return loss is better than-15 dB. The performance can be further improved by using lower-loss dielectric materials. The design is also scalable to other frequency bands.
Keywords :
UHF phase shifters; thin film capacitors; varactors; FR4 dielectric material; branchline coupler; frequency 900 MHz; low-loss voltage-controlled analog phase-shifter; thin-film microstrip technology; varactor diodes; Dielectric loss measurement; Dielectric materials; Dielectric measurements; Diodes; Loss measurement; Materials testing; Phase shifters; Radio frequency; Varactors; Voltage;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2007. ICMMT '07. International Conference on
Conference_Location :
Builin
Print_ISBN :
1-4244-1049-5
Electronic_ISBN :
1-4244-1049-5
DOI :
10.1109/ICMMT.2007.381435