A Dual-Fed PIFA Antenna Element With Nonsymmetric Impedance Matrix for High-Efficiency Doherty Transmitters: Integrated Design and OTA-Characterization
Journal article, 2020

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.

Antenna integration

Doherty power amplifier

Antennas

Author

Oleg Iupikov

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

William Hallberg

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Rob Maaskant

Chalmers, Electrical Engineering, Communication and Antenna Systems

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics, Microwave Electronics

Robert Rehammar

Bluetest

Koen Buisman

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Marianna Ivashina

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 68 1 21-32

INITIATE=InNovatIve acTIve integrATED antennas

VINNOVA, 2018-09-01 -- 2020-08-31.

VINNOVA, 2017-10-24 -- 2018-01-31.

Subject Categories

Telecommunications

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TAP.2019.2938738

More information

Latest update

2/10/2020