A Cavity-Backed Patch Antenna with Distributed Multi-Port Feeding, Enabling Efficient Integration with Doherty Power Amplifier and Band-Pass Filter
Journal article, 2021

A joint design approach for co-integrated antenna and power amplifier (PA), employing a high-efficiency Doherty PA (DPA) architecture and including a band-pass RF filter, is proposed. This design is realized through the optimally distributed and balanced multi-port feeding of the cavity-backed patch antenna element that provides the desired (unique) loading conditions for the main and auxiliary PA branches and tailored power combining. A novelty and advantage of this feeding solution is that each pair of feeding points form a virtual common feeding centre of the radiating element; as a result, the radiation pattern remains power invariant when the port excitations change. A joint optimization of the integrated antenna-DPA transmitter is carried out to enhance the overall performance and maximize the bandwidth. This optimization is demonstrated through an example design for the sub-6 GHz telecommunication applications that target high power-efficiency (>50%) at the 6dB backed-off power levels and require RF-filtering in a compact integrated design. The latter challenge leads to a non-conventional implementation, which generally does not require the filter to be inserted between the antenna and the final output stage of the PA, and can be embedded in the topology with complex-valued source/load impedance values. Results of numerical studies are supported by measurements obtained with the antenna-DPA-filter prototype system.

Doherty power amplifier

antenna integration

Author

Oleg Iupikov

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

Jose-Ramon Perez-Cisneros

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Petrie Meyer

Chalmers, Electrical Engineering, Communication and Antenna Systems, Antennas

Daniel Åkesson

Ericsson

Rob Maaskant

Chalmers, Electrical Engineering, Communication and Antenna Systems

Koen Buisman

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Robert Rehammar

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Christian Fager

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. In press

Subject Categories

Telecommunications

Signal Processing

Condensed Matter Physics

DOI

10.1109/TAP.2020.3048529

More information

Latest update

8/3/2021 8