Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Reexamination Certificate
2005-05-31
2005-05-31
Gelin, Jean (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
C455S575100, C455S095000
Reexamination Certificate
active
06901245
ABSTRACT:
A personal communications apparatus comprises an elongate body202incorporating an antenna diversity arrangement in which first and second antennas (102A,102B) are located at opposite ends of the body.In one embodiment a microphone (114) is located at the tip of one antenna (102A) and a loudspeaker (116) at the tip of the other antenna (102B). The microphone (114) and loudspeaker (116) act as top loads to their respective antennas, thereby enabling the use of shorter antennas. The antennas (102A,102B) may be formed from coaxial cable, enabling them to provide electrical connections between the microphone (114) or loudspeaker (116) and transceiver circuitry in the body of the apparatus. By arranging for the microphone (114) and loudspeaker (116) to have low impedances at radio frequencies, the coaxial cable acts as an inductive stub and enables the antennas (102A,102B) to be further shortened.
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By R.J. Clarke “A Statistical Theory of Mobile-Radio Reception”; Bell Systems Technical Journal, vol. 47, No. 6, pp. 957-100.
Patent Abstract of Japan vol. 006, No. 055 (E-101), Apr. 10, 1982 corresponds to JP 56168437, Dec. 24, 1981.
Gelin Jean
Halajian Dicran
Koninklijke Philips Electronics , N.V.
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