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Investigations of active antenna doherty power amplifier modules under beam-steering mismatch

: Gashi, Bersant; Krause, Sebastian; Quay, Rüdiger; Fager, Christian; Ambacher, Oliver


IEEE microwave and wireless components letters 28 (2018), Nr.10, S.930-932
ISSN: 1051-8207
ISSN: 1531-1309
Fraunhofer IAF ()
active antenna array; antenna crosstalk; beam-steering; Doherty power amplifier (DPA); GaN; mutual coupling; voltage-standing-wave ratio (VSWR)

This letter investigates the performance of a Doherty power amplifier (DPA) in an 8 x 1 active antenna transmitter module under an average voltage-standing-wave ratio of 4 : 1 induced by the array 1-D beam steering and mutual coupling. The GaN based DPA and a 2 x 1 segment of the array are verified via measurements at the operating frequency of 3.5 GHz. The co design and co-simulation of both the antenna array and the behavioral model of the DPA show that the inherent back-off efficiency benefit-when compared to traditionally used class-AB and -B amplifiers in base stations-can be maintained when restricting the beam-steering angle, in this case theta is an element of [-45 degrees, 45 degrees], and operational bandwidth of the combined system.