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

Volume

47

Issue

8

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

1418

Lastpage

1425

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.780389

Filename

780389