Abstract: An electromechanical structure is provided for a portable radio device. In comprises a circuit board (302, 401), a number of components (301, 402) attached to the circuit board, a conductive shield (303, 304, 404, 407) for enclosing the components and an essentially planar antenna radiator (305, 410). A part (304, 407) of the conductive shield is essentially planar and adjacent to the antenna radiator (305, 410) in order to function as a ground plane for the antenna radiator.

Abstract: A power boost system for a portable radiotelephone (10) employs a booster unit (52) to provide sufficient power for operation of the radiotelephone as a mobile unit in a cellular telephone system, and a junction box (54) which, in combination with a mechanical holder (56) allows for hands-free operation of the radiotelephone in the mobile telephone environment. The junction box is provided with a speaker (62) and a microphone (64) to facilitate the hands-free operation. The desired output power level for radiation from a vehicular antenna (72) is provided by a gain-controlled amplifier (80) in response to a pulse-width modulated command signal (48, 90) provided by a computer (12) within the radiotelephone. A memory (70) within the booster unit stores power level data for the higher levels of power to be used during transmission by the booster unit, the power level data being provided to the computer (12) in generating the power command signal.