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The rubber ducky antenna (or rubber duck aerial) is an electrically short monopole antenna, invented by Richard B. Johnson, that functions somewhat like a base-loaded whip antenna. It consists of a springy wire in the shape of a narrow helix , sealed in a rubber or plastic jacket to protect the antenna. [ 1 ]
Stubs are commonly used in antenna impedance matching circuits, frequency selective filters, and resonant circuits for UHF electronic oscillators and RF amplifiers. Stubs can be constructed with any type of transmission line: parallel conductor line (where they are called Lecher lines), coaxial cable, stripline, waveguide, and dielectric waveguide.
The T28 was the lightest and slimmest mobile phone at the time, with a weight of only 83 grams. [1]Like many mobile phones of the time (1999) it had a fixed, stubby external antenna.
A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, ...
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T56-A14 engines. The P-3C had a new ASW suite and mission computer with a revised internal layout. Externally the P-3C featured electrically operated entry ladder; small fin-top antenna; externally loaded belly sonobuoy chutes; and three small windows on the aft right side (one window forward of the overwing emergency exit and two well aft).
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