Abstract
| 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 | |
| Publication status | Published - 2007 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Antennas
- Impedance matching
- Microwave communication
- Power amplifiers (PAs)
Cite this
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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 journal › Article › Scientific › peer-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 -