Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

David Duperray

Peter Johan Massey

Lukas Leyten

Steven J W Van Lerberghe

Cyrille M J M Amar

A portable communication device has an antenna configuration that allows to form various different antenna directivity configurations. In particular, a control device discriminates between a transmitting state and a receiving state of the communication device. As based thereon, it effects various non-uniform selection patterns among the directivity configurations.

Portable communication device arranged for state-dependently controlling non-uniform selection patterns among possible antenna directivity configurations

A transmitter has a power amplifier amplifying a radio frequency transmit signal. The radio frequency transmit signal is a non-constant envelope modulated signal. The power amplifier has a first compression point. In a method for sliding a compression point in the transmitter, the power amplifier is operated at a first backoff from the first compression point such that a given adjacent channel power ratio requirement is met for a first peak-to-average ratio of the radio frequency transmit signal. The first compression point is slide to a second compression point for a second peak-to-average ratio of the radio frequency transmit signal, the second compression point being lower than the first compression point. The first and second peak-to-average ratios are dependent on information content of the non-constant envelope modulated signal.

Transmitter with a sliding compression point

A radio communication apparatus is disclosed having a transceiver which receives and transmits signals; an excitation link which is connected to the transceiver; and a rod antenna which is electrically connected at a first tip to the excitation link in an extended position and electrically disconnected from the excitation link in a retracted position. A first coil is located around the rod antenna in a housing, where the first coil has a first end connected to the excitation link. Further, a conducting ring is located over the housing, where the conducting ring contacts a second end of the first coil. An insulating element is located at a second tip of the rod antenna, and a conductive plate is located over the insulating element. The conductive plate is perpendicular to the rod antenna and is parallel to the conducting ring. In addition, a second coil is connected to the conducting plate, where the conducting plate contacts the conducting ring in the retracted position of the rod antenna to connect the two coils in series and form a coil having a length which equals the sum of the lengths of the two coils.

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Le Mans, France

David Duperray