A Dual-Fed PIFA Antenna Element With Nonsymmetric Impedance Matrix for High-Efficiency Doherty Transmitters: Integrated Design and OTA-Characterization
Artikel i vetenskaplig tidskrift, 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



Oleg Iupikov

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Antennsystem

William Hallberg

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Rob Maaskant

Chalmers, Elektroteknik, Kommunikations- och antennsystem

Christian Fager

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik, Mikrovågselektronik

Robert Rehammar


Koen Buisman

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Marianna Ivashina

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Antennsystem

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.




Annan elektroteknik och elektronik



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