Cecil, W5DXP wrote:
"So you haven`t tried to model an antenna with a 180 degree
phase-reversing coil, have you?"

Kraus` Figure 23-21(b) has phase-reversing coils used as traps. "Here
the elements present a high impedance to the coil which may be resonated
without an external capacitance due to its distributed capacitance."

Kraus` trap is a self parallel resonant circuit, not just another
inductance.

However, a center-tapped coil can make an excellent phase inverter as in
the vacuum tube type Detroit Electric Company (Delco) Buick car radios
of the late 1930`s and early 1940`s. This radio had great sound despite
limited frequency response inevitable with choke and transformer
coupling.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:
Kraus` trap is a self parallel resonant circuit, not just another
inductance.

Point is that all real-world coils possess distributed capacitance
and distributed resistance as well as inductance. There is capacitance
but no capacitor in Kraus' trap. If one replaces the "phase-reversing
coil" with a phase-reversing stub, EZNEC gives the correct current
distribution.
--
73, Cecil http://www.qsl.net/w5dxp



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