Variable antenna load for transmitter efficiency improvement

V. Kaajakari; A. Alastalo; K. Jaakkola; H. Seppä

doi:10.1109/TMTT.2007.902093

Variable antenna load for transmitter efficiency improvement

V. Kaajakari, A. Alastalo, K. Jaakkola, H. Seppä

BA1408 Flexible sensors and devices

Research output: Contribution to journal › Article › Scientific › peer-review

4 Citations (Scopus)

Abstract

A wireless radio transmitter with an integrated variable-impedance antenna is demonstrated. The transmit signal is connected via a switch to the antenna at one of several feed points that correspond to different load impedances that are optimal for the power amplifier at different transmit power levels. It is shown that this can be used to improve the efficiency of the transmission at low and medium transmit powers. The variable antenna load is demonstrated with a planar inverted-F antenna, but the method can be applied to any antenna with suitable impedances.

Original language	English
Pages (from-to)	1666-1671
Number of pages	6
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	55
Issue number	8
DOIs	https://doi.org/10.1109/TMTT.2007.902093
Publication status	Published - 2007
MoE publication type	A1 Journal article-refereed

Keywords

Antennas
Impedance matching
Microwave communication
Power amplifiers (PAs)

Access to Document

10.1109/TMTT.2007.902093

https://www.scopus.com/inward/record.uri?eid=2-s2.0-34547972160&doi=10.1109%2fTMTT.2007.902093&partnerID=40&md5=86e7bd78ad71e20e90a726516aa1b8e0

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Kaajakari, V., Alastalo, A., Jaakkola, K., & Seppä, H. (2007). Variable antenna load for transmitter efficiency improvement. IEEE Transactions on Microwave Theory and Techniques, 55(8), 1666-1671. https://doi.org/10.1109/TMTT.2007.902093

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AU - Jaakkola, K.

AU - Seppä, H.

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AB - A wireless radio transmitter with an integrated variable-impedance antenna is demonstrated. The transmit signal is connected via a switch to the antenna at one of several feed points that correspond to different load impedances that are optimal for the power amplifier at different transmit power levels. It is shown that this can be used to improve the efficiency of the transmission at low and medium transmit powers. The variable antenna load is demonstrated with a planar inverted-F antenna, but the method can be applied to any antenna with suitable impedances.

KW - Antennas

KW - Impedance matching

KW - Microwave communication

KW - Power amplifiers (PAs)

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JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

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