Notes on Building Antennas That Work
The writer will endeavor to provide some examples of antennas that work well and explain in simple terms why. In simple terms, an antenna is a device for matching the RF energy applied to it to free space. Usually the energy is applied to the antenna by a transmission line.
This device used to move energy to the antenna may be coaxial, (a wire on the same axis as a shielding tube or braid, (hence the term coaxial or on the same center axis.
A balanced feed line often consisting of two wires spaced apart evenly is popular and often called ladder line. A third type used in microwave systems is wave guide This finds very little use except for those amateurs who take microwave work seriously and commercial work at UHF and above.
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