Title :
A new active RF phase shifter using variable gain, drain Voltage controlled PHEMTs:A 2.4-GHz ISM implementation
Author :
Mitilineos, Stelios A. ; Mitropoulos, George K. ; Capsalis, Christos N.
Author_Institution :
Lab. of Antennas, Nat. Tech. Univ. of Athens, Greece
fDate :
7/1/2005 12:00:00 AM
Abstract :
Phase shifters operating at RF bands are an essential component of phased and adaptive arrays circuits. In this letter, an active phase shifter is proposed, using vector summing of an in-phase and a quad-phase replica of the incoming signal. The proposed scheme was designed and implemented using a Wilkinson power combiner/divider, a branch line hybrid coupler and single-stage variable gain amplifiers (VGAs), achieving continuous phase shift within the range of [0°, 90°]. The manufactured prototype is suitable for WLAN operations in the 2.4-GHz ISM band. Details of the phase shifter design and experimental results are presented.
Keywords :
UHF phase shifters; active networks; amplifiers; high electron mobility transistors; power combiners; power dividers; 2.4 GHz; ISM implementation; RF bands; WLAN operations; Wilkinson power combiner; Wilkinson power divider; active RF phase shifter; adaptive arrays circuits; branch line hybrid coupler; drain voltage controlled PHEMT; phased arrays circuits; single-stage variable gain amplifiers; variable gain PHEMT; vector summing; voltage controlled amplifier; voltage controlled phase shifter; Adaptive arrays; Coupling circuits; Gain; Manufacturing; Phase shifters; Phased arrays; Power amplifiers; Power combiners; Radio frequency; Voltage control; Vector summing; voltage controlled amplifier; voltage controlled phase shifter;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.851555
