Abstract: The antenna unit including a first antenna portion including a first element, a first board for mounting the first element, and a feeding conductor for electrically connecting the first element and the first board and capable of receiving a radio wave in a first frequency band, and a second antenna portion including a second element shorter than the first element, and a second board for mounting the second element and capable of receiving a radio wave of a second frequency band higher than the first frequency band, in which a length of a transmitting path of the feeding conductor and a length of the second element are formed to configure lengths different from each other.

Abstract: An antenna unit including a first antenna portion including a first element, a first board for mounting the first element, and a feeding conductor for electrically connecting the first element and the first board and capable of receiving a radio wave in a first frequency band, and a second antenna portion including a second element shorter than the first element, and a second board for mounting the second element and capable of receiving a radio wave of a second frequency band higher than the first frequency band, in which a length of a transmitting path of the feeding conductor and a length of the second element are formed to configure lengths different from each other.

Abstract: An electronically controlled antenna system comprises an antenna having a plurality of antenna elements, a first device for producing a plurality of antenna modes by using the antenna elements, a second device for detecting a current position of the antenna, and a third device for switching the antenna modes of the first device in accordance with the current position detected by the second device.

Abstract: In a picture block retransmission arrangement of a receiver in which a band-compression encoded picture block signal transmitted from a counterpart transmitter is decoded into a reproduced block signal comprising reproduced line signals representative of successive picture lines on a picture block, a checking arrangement (42, 43) checks whether each reproduced line signal is a correct or an incorrect line signal. A retransmission requesting assembly (44, 45, 15, 12) requests the transmitter to again transmit the picture block signal when the incorrect line signals are not less in number than a predetermined number. A substituting assembly (38, 41, 17, 46, 15) substitutes, for each incorrect line signal representative of a particular one of the picture lines, an again reproduced line signal decoded from one of the picture line signals that represents the particular picture line in the picture block signal retransmitted from the transmitter.