Optimizing RF Efficiency of a Vector-Modulator-Driven Antenna Array

Thumbnail Image

Access rights

openAccess

URL

Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)

Authors

Date

2020-12

Department

Department of Electronics and Nanoengineering

Major/Subject

Mcode

Degree programme

Language

en

Pages

5
2507-2511

Series

IEEE Antennas and Wireless Propagation Letters, Volume 19, issue 12

Abstract

The feed vector of an antenna array determines the array pattern and the active input impedance of each element. On the other hand, the output impedance of a variable-gain power amplifier, such as that used in a vector-modulator, depends on the amplification level. The resulting impedance mismatch is typically neglected when designing and controlling antenna arrays at the cost of reduced gain, bandwidth, and beam-steering range. This letter presents a simple method to find the array feed vector that maximizes the realized gain in a given direction in a case when the power amplifier output impedance depends on its amplification level. We verify the method with simulations for a test case consisting of a 4×1 patch array fed with ideal phase-shifters and realistic amplifiers. The simulation results of the case study show that the method improves transmission efficiency by 3.5 dB on average compared to the traditional phase shift.

Description

Keywords

Beam steering, efficiency, eigenanalysis, weighting

Other note

DOI

10.1109/LAWP.2020.3037755

Citation

Kutinlahti, V P, Lehtovuori, A & Viikari, V 2020, ' Optimizing RF Efficiency of a Vector-Modulator-Driven Antenna Array ', IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 12, 9259037, pp. 2507-2511 . https://doi.org/10.1109/LAWP.2020.3037755

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202101251418

Collections

[article-cris] Sähkötekniikan korkeakoulu / ELEC