Telecommunications – Transmitter – Mobile or portable
Patent
1979-06-04
1982-04-27
Chin, Tommy P.
Telecommunications
Transmitter
Mobile or portable
455128, 455129, H04B 1034
Patent
active
043274447
ABSTRACT:
There is disclosed a miniature hand-held radio-frequency transmitter. An operating frequency is determined by a lumped-circuit oscillator which feeds an antenna etched on the periphery of the circuit board. The antenna is tuned to a frequency which is slightly above the second harmonic of the operating frequency, it being the second harmonic which is radiated. By slightly mis-tuning the antenna, the effects of an enveloping hand are minimized. The clasping of the transmitter by a human hand results in the absorption of some of the radiated power, but hand-capacitance effects also shift the center frequency of the antenna characteristic toward the second harmonic of the operating frequency, thus increasing the radiated power. In this way the signaling range under free-space conditions is the same as that under operating conditions. The oscillator circuit can thus be adjusted for maximum power output under free-space conditions within the guidelines of F.C.C. Regulations, without the signaling range being appreciably reduced under operating conditions. The radiated frequency is not appreciably affected by hand capacitance effects because it is determined by a lumped-circuit oscillator.
REFERENCES:
patent: 2319627 (1943-05-01), Perlman
patent: 2549259 (1951-04-01), Strommen
patent: 2924705 (1960-02-01), Jones
patent: 3134075 (1964-05-01), Langevin
patent: 3204198 (1965-08-01), Backnick
patent: 3277377 (1966-10-01), Guyton et al.
patent: 3902118 (1975-08-01), Ikrath
patent: 4004228 (1977-01-01), Mullett
Chin Tommy P.
TMX Systems Limited
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