Antenna unit, communication system and digital television receiver
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsJoji Kane, Takasi Yosida, Noboru Nomura, Michio Sasaki, Akinori Yanase, Satoshi Yamada
Life of this patent
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Abstract
An antenna device comprising a conductive earth substrate, a receiving element located in the proximity of said conductive earth substrate and having a receiving terminal, and a transmitting element located in the proximity of said receiving element and having a transmitting terminal, characterized in that an end of said receiving element and an end of said transmitting element are connected to said conductive earth substrate for grounding through a common portion and the frequency band of said receiving element is different from that of said transmitting element.
Claims46
An antenna device comprising:
- a conductive earth substrate;
- a receiving element located in the proximity of said conductive earth substrate and having a receiving terminal;
- and
- a transmitting element located in the proximity of said receiving element and having a transmitting terminal,
- characterized in that an end of said receiving element and an end of said transmitting element are connected to said conductive earth substrate for grounding through a common portion and the frequency band of said receiving element is different from that of said transmitting element.
An antenna device comprising:
- a conductive earth substrate;
- an antenna element having an end connected to said conductive earth substrate for grounding and formed on a common circuit board;
- and
- a feeding terminal pulled out of said antenna element, characterized in that a resonant circuit is inserted between said feeding terminal and the other end of said antenna element which is not grounded, and said antenna element and said resonant circuit are located together on one side of said common circuit.
A communication system comprising:
- an antenna device having a conductive earth substrate, an antenna element formed on a common circuit board located in the proximity of said conductive earth substrate, and a receiving amplifier provided on said common circuit board between said antenna element and a feeding terminal;
- a receiver having a power supply section to supply electric power to said receiving amplifier of said antenna device;
- and
- a feeding line for connecting said feeding terminal of said antenna device to a signal input section of said receiver,
- characterized in that a direct-current blocking capacitor is provided between said receiving amplifier of said antenna device and said feeding terminal and at the input terminal of a receiving amplifier of said receiver, respectively, and electric power is supplied by said power supply section to said receiving amplifier of said antenna device through said feeding line.
A communication system comprising:
- an antenna device having a conductive earth substrate, a receiving element having a receiving terminal formed on a common circuit board located in the proximity of said conductive earth substrate, a transmitting element having a transmitting terminal formed on said common circuit board located in the proximity of said receiving element, and a transmitting/receiving changeover circuit provided on said common circuit board and capable of switching said receiving terminal and said transmitting terminal;
- a feeding line connected to said transmitting/receiving changeover circuit;
- and
- a communication device connected to said feeding line and capable of both transmitting and receiving, characterized in that said transmitting/receiving changeover circuit of said antenna device is controlled by using a switch signal to change over to the transmission operation in said communication device.
An antenna device comprising:
- a conductive earth substrate;
- a main antenna element connected to said conductive earth substrate through a first ground connection to be substantially parallel to said conductive earth substrate;
- a feeding terminal connected to a point in said main antenna element wherein a grounding terminal of said feeding terminal is connected to said first ground connection;
- and
- a passive element connected to said conductive earth substrate through a second ground connection along said main antenna element.
Dependencies are inferred from the claim text.