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A Dual-Fed PIFA Antenna Element With Nonsymmetric Impedance Matrix for High-Efficiency Doherty Transmitters: Integrated Design and OTA-Characterization
IEEE Transactions on Antennas and Propagation ( IF 4.371 ) Pub Date : 2019-09-13 , DOI: 10.1109/tap.2019.2938738
Oleg A. Iupikov; William Hallberg; Rob Maaskant; Christian Fager; Robert Rehammar; Koen Buisman; Marianna V. Ivashina

A single planar inverted F-antenna is proposed employing two input ports to optimally power-combine the output signals of two nonlinear power amplifiers inside the metal-only low-loss antenna structure. High power-added efficiency (PAE) at back-off power levels is reached through a Doherty combiner architecture, where the optimal power combination is seen to generally require the synthesis of a nonsymmetric antenna input impedance matrix. The dual-fed antenna is compact and exhibits close to single-mode radiation properties; it has a relatively stable gain pattern despite the nonequal Doherty power amplifier (PA) output powers. An integrated active prototype has been designed, fabricated, and characterized over-the-air in both an anechoic and a reverberation chamber. Good agreement is observed and an uncertainty analysis is performed. The Doherty transmitter features a max-PAE of 58% at 2.14 GHz and a 6 dB back-off PAE of 52%; a minimum system power gain of 9.5 dB (max 12 dB); and a maximum system output power of 43.5 dBm.
更新日期:2020-01-07

 

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