Re: MOSFET Coil Paper (antenna input impedances)

• To: tesla-at-pupman-dot-com
• Subject: Re: MOSFET Coil Paper (antenna input impedances)
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sun, 07 Feb 1999 06:00:10 -0700
• Approved: twf-at-verinet-dot-com

"
Quarter wave antennas ( I assume you mean a monopole over a ground
plane) at
resonance have an impedance of 36 ohms resistive (at resonance is the
key).
it gets tricky when the antenna is real (i.e. lossy components of finite
size over a finite lossy ground, etc.)  But, there are some equations
giving
the impedance of an arbitrary cylindrical or conical size."

	Right on.  Nothing mysterious here.

"TC's are so small in wavelengths (100 kHz wavelength = 3 km) that
antenna
formulae wouldn't be really applicable."

	Helical antenna formulae DO apply, and say "there ain't enough
radiation to worry about"!  

Ed

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