Title :
Integrated-antenna push-pull power amplifiers
Author :
Deal, William R. ; Radisic, Vesna ; Qian, Yongxi ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
8/1/1999 12:00:00 AM
Abstract :
In this paper, the integrated-antenna concept is applied to push-pull power amplifiers (PAs). In this approach, the antenna serves as an out-of-phase power combiner and tuned load for higher harmonics. This new architecture effectively has a near-zero loss output hybrid, and results in a high-efficiency PA. The first example is a narrow-band push-pull amplifier integrated with a dual-feed patch antenna. At an operating frequency of 2.5 GHz, a maximum measured power-added efficiency (PAE) of 55% is achieved. The second example is a broadband push-pull amplifier integrated with a dual-feed slot antenna amplifier operating at 2.46 GHz which has a peak PAE of 63%, and PAE better than 55% in an 8% bandwidth. Additionally, 48% PAE is achieved with code-division multiple-access modulation and adjacent-channel power ratio better than -42 dBe at a 1.25-MHz offset
Keywords :
UHF antennas; UHF power amplifiers; active antennas; code division multiple access; differential amplifiers; microstrip antennas; power combiners; 2.5 GHz; 48 percent; 55 percent; 63 percent; adjacent-channel power ratio; code-division multiple-access modulation; dual-feed patch antenna; high-efficiency PA; integrated antennas; integrated-antenna concept; near-zero loss output hybrid; operating frequency; out-of-phase power combiner; power-added efficiency; push-pull power amplifiers; tuned load; Antenna measurements; Broadband amplifiers; Broadband antennas; Frequency; Loaded antennas; Narrowband; Patch antennas; Power amplifiers; Power combiners; Power system harmonics;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
