Thread: Supporting theory that Antennas "Match" to 377 Ohms (Free space)
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Old July 24th 17, 03:53 PM posted to rec.radio.amateur.antenna
J.B. Wood[_2_] J.B. Wood[_2_] is offline
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Default Supporting theory that Antennas "Match" to 377 Ohms (Free space)
On 07/21/2017 05:32 PM, wrote:
The reason we don't match the antennas to the impedance of free-space is very simple, it all has to do with Industry standards, manufacturing, and application. If you increase the impedance of the coax to match a 377Ω antenna and transceiver, the design of the coax would demand that you increase the dielectric diameter ≈ 230 times in order to preserve the current capacity of the center conductor.

Hello, and I think you're confusing the intrinsic impedance of free
space (377 ohms) with the feedpoint impedance of an antenna, which
depends on frequency, physical dimensions, and construction materials of
the antenna. It's the antenna feedpoint impedance that we match our RF
source to, not the free space impedance. Sincerely, and 73's from N4GGO,

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