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 |
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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 |
Keywords
- Antennas
- Impedance matching
- Microwave communication
- Power amplifiers (PAs)