Variable antenna load for transmitter efficiency improvement

Research output: Contribution to journalArticleScientificpeer-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 languageEnglish
Pages (from-to)1666-1671
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Volume55
Issue number8
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

transmitters
Transmitters
antennas
Antennas
impedance
radio transmitters
Radio transmitters
Antenna feeders
power amplifiers
Power amplifiers
switches
Switches

Keywords

  • Antennas
  • Impedance matching
  • Microwave communication
  • Power amplifiers (PAs)

Cite this

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title = "Variable antenna load for transmitter efficiency improvement",
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.",
keywords = "Antennas, Impedance matching, Microwave communication, Power amplifiers (PAs)",
author = "V. Kaajakari and A. Alastalo and K. Jaakkola and H. Sepp{\"a}",
year = "2007",
doi = "10.1109/TMTT.2007.902093",
language = "English",
volume = "55",
pages = "1666--1671",
journal = "IEEE Transactions on Microwave Theory and Techniques",
issn = "0018-9480",
publisher = "Institute of Electrical and Electronic Engineers IEEE",
number = "8",

}

Variable antenna load for transmitter efficiency improvement. / Kaajakari, V.; Alastalo, A.; Jaakkola, K.; Seppä, H.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 8, 2007, p. 1666-1671.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Variable antenna load for transmitter efficiency improvement

AU - Kaajakari, V.

AU - Alastalo, A.

AU - Jaakkola, K.

AU - Seppä, H.

PY - 2007

Y1 - 2007

N2 - 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.

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)

U2 - 10.1109/TMTT.2007.902093

DO - 10.1109/TMTT.2007.902093

M3 - Article

VL - 55

SP - 1666

EP - 1671

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

SN - 0018-9480

IS - 8

ER -