Antenna feed structure
OwnerJyrki Portininventor
Life of this patent
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Abstract
The invention relates to an arrangement for feeding an antenna. The antenna (220) itself is symmetric. The antenna feed line (210) is also symmetric such that its conductors (211, 212) are twisted with respect to each other. In practice, half a turn is enough. The output of the stage (205) feeding the antenna is balanced. The invention facilitates a controlled radiation pattern of the antenna. The antenna feed line has a good capacitive balance, which means little interference in the operation of nearby circuits and, hence, a greater maximum transmission power. The structure is relatively simple and has low production costs.
Claims6
An arrangement for feeding an antenna of a radio apparatus, which arrangement comprises an output stage and a transmission line including a first and a second conductor, whereby
- the said output stage has got a balanced output to one contact of which the first conductor is connected and to the other contact of which the second conductor is connected,
- the said transmission line is symmetric and its first and second conductors are twisted with respect to each other, and
- the said antenna is symmetric.
Dependencies are inferred from the claim text.