Cellular phone capable of receiving a plurality of broadcast waves

• US 20050119026A1
• Filed: 11/23/2004
• Published: 06/02/2005
• Est. Priority Date: 11/27/2003
• Status: Active Grant

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Harano, Nobuya
• Granted Patent: US 7,340,274 B2
• Time in Patent Office: Days
• US Class Current: 455/556.100
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 5/335 at the feed, e.g. for impedance matching
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H

Abstract

A cellular telephone set is capable of receiving a plurality of broadcast waves while efficiently covering wide bands such as FM and TV broadcasts and reducing mutual effects on radio circuits if the cellular telephone set has the additional function of receiving FM and TV broadcasts and the antenna of the cellular telephone set is used to share receipt of FM and TV broadcasts. The cellular telephone set has an antenna, a radio unit selector switch branching a line connected to the antenna into two lines that are connected respectively to a switch and a cellular telephone set radio unit, and a plurality of impedance adjusting circuits connected parallel to the switch and associated with the broadcast waves, respectively. The switch selects one of the impedance adjusting circuits which is associated with the broadcast wave that is being currently received.

Claims

1. A cellular telephone set capable of receiving a plurality of broadcast waves, comprising:

an antenna for sending and receiving a radio wave in a band used by the cellular telephone set and receiving a plurality of broadcast waves;

a first switch;

a cellular telephone set radio unit for performing a cellular telephone function using said antenna;

a radio unit selector switch branching a line connected to said antenna into two lines that are connected respectively to said first switch and said cellular telephone set radio unit;

a second switch;

a plurality of impedance adjusting circuits connected in parallel between said first switch and said second switch and associated with said plurality of broadcast waves, respectively;

a TV/FM controller for outputting an identification signal representing one of the broadcast waves, that is being currently received to said first switch and said second switch; and

a TV/FM receiver for demodulating the broadcast wave which is output from said second switch;

wherein said first switch and said second switch select one of said impedance adjusting circuits which is associated with the broadcast wave that is being currently received and which is represented by said identification signal.

2. A cellular telephone set capable of receiving a plurality of broadcast waves, comprising:

an antenna for sending and receiving a radio wave in a band used by the cellular telephone set and receiving a plurality of broadcast waves;

a first switch;

a cellular telephone set radio unit for performing a cellular telephone function using said antenna;

a frequency distributor connected to said antenna, for separating the radio wave in the band used by the cellular telephone set and the broadcast waves from each other, supplying the radio wave in the band used by the cellular telephone set to said cellular telephone set radio unit, and supplying the broadcast waves to said first switch;

a second switch;

a plurality of impedance adjusting circuits connected in parallel between said first switch and said second switch and associated with said plurality of broadcast waves, respectively;

a TV/FM controller for outputting an identification signal representing one of the broadcast waves that is being currently received, to said first switch and said second switch; and

a TV/FM receiver for demodulating the broadcast wave which is output from said second switch;

wherein said first switch and said second switch select one of said impedance adjusting circuits which is associated with the broadcast wave that is being currently received and which is represented by said identification signal.

3. A cellular telephone set capable of receiving a plurality of broadcast waves, comprising:

an antenna for sending and receiving a radio wave in a band used by the cellular telephone set and receiving a plurality of broadcast waves;

a switch;

a cellular telephone set radio unit for performing a cellular telephone function using said antenna;

a TV/FM receiver for demodulating the broadcast waves which are received by said antenna;

a radio unit selector switch branching a line connected to said antenna into two lines that are connected respectively to said switch and said TV/FM receiver;

a plurality of impedance adjusting circuits connected in parallel between said switch and ground and associated with said plurality of broadcast waves, respectively; and

a TV/FM controller for outputting an identification signal representing one of the broadcast waves, that is being currently received to said switch;

wherein said switch selects one of said impedance adjusting circuits which is associated with the broadcast wave that is being currently received and which is represented by said identification signal.

4. A cellular telephone set capable of receiving a plurality of broadcast waves, comprising:

an antenna for sending and receiving a radio wave in a band used by the cellular telephone set and receiving a plurality of broadcast waves;

a switch;

a cellular telephone set radio unit for performing a cellular telephone function using said antenna;

a TV/FM receiver for demodulating the broadcast waves which are received by said antenna;

a frequency distributor connected to said antenna, for separating the radio wave in the band used by the cellular telephone set and the broadcast waves from each other, supplying the radio wave in the band used by the cellular telephone set to said cellular telephone set radio unit, and supplying the broadcast waves to said switch and said TV/FM receiver;

a plurality of impedance adjusting circuits connected in parallel between said switch and ground and associated with said plurality of broadcast waves, respectively; and

a TV/FM controller for outputting an identification signal representing one of the broadcast waves, that is being currently received to said switch;

wherein said switch selects one of said impedance adjusting circuits which is associated with the broadcast wave that is being currently received and which is represented by said identification signal.