Method for selecting the frequency range in radio communication devices operating in several frequency ranges and a radio communication device

• US 6,405,025 B1
• Filed: 12/07/1998
• Issued: 06/11/2002
• Est. Priority Date: 12/09/1997
• Status: Expired due to Fees

• Current Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Keski-Mattinen, Seppo
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US09/206,490
• Time in Patent Office: 1,282 Days
• Field of Search: 455/266, 455/200.1, 455/343, 455/553
• US Class Current: 455/266
• 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 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

The invention relates to a method for filtering radio frequency signals in so called multiband radio communication devices that operate in several frequency ranges and to a communication device operating in several frequency ranges. In the method according to the invention, the desired frequency range is selected so that of the amplifiers (62a, 62b, 62c; 72a, 72b, 72c) placed between the filters (61, 63) on the reception branch (11) or correspondingly between the filters (71, 73) on the transmission branch (12) the amplifiers that control the desired signal paths are activated.

Claims

1. A radio communication device such as a radio transceiver operating at least two different frequency ranges having a reception branch for receiving radio signals in one of the frequency ranges and a transmission branch for transmitting radio signals in the same frequency range as receiving radio signals, which device comprises:

an antenna and a duplexing means for separating reception and transmission modes of operation and

which device further comprises in the reception branch;

a first group of bandpass filters, a first group of amplifiers, a second group of bandpass filters and a first mixer, which filters in the first and second group of filters and the first group of amplifiers are arranged so that parallel signal paths for each frequency ranges are defined and where, during reception, a first input signal via the switch is directed to the first group of bandpass. filters and via the first group of amplifiers to the second group of bandpass filters, where a first output signal is directed through the first mixer to a RF circuit of the communication device for further processing,

which device further comprises in the transmission branch;

a second mixer, a third group of bandpass filters, a second group of amplifiers and a fourth group of bandpass filters, which filters in the third and fourth group of filters and the second group of amplifiers are arranged so that parallel signal paths for each frequency ranges are defined and where, during transmission, a second input signal is directed through the second mixer to the third group of bandpass filters and via the second group of amplifiers to the fourth group of bandpass filters and further as a second output signal via the switch to the antenna

which device further comprises;

a selecting means for selecting one of the frequency ranges by activating an amplifier in the reception and transmission branch among said first and second group of amplifiers in the signal path corresponding to said frequency range.

2. A radio communication device according to claim 1 in which the actuator unit comprises a group of actuators such as switches by which the amplifiers are switched on and off.

3. A radio communication device according to claim 1, which comprises a control unit for controlling the actuators of said actuator unit.

4. A radio communication device according to claim 1 in which

the first group of bandpass filters are produced as a first filter package wherein the individual filters have been integrated which first filter package have an input for input signals and a group of outputs separating the incoming signal to one of the frequency ranges and to the respective signal path to each of which outputs one amplifier of the first group of amplifiers is connected;

the second group of bandpass filters are produced as a second filter package wherein the individual filters have been integrated which second filter package have a group of inputs corresponding to the signal paths to each of which inputs one amplifier of the first group of amplifiers is connected and an output for output signals for reception;

the third group of bandpass filters are produced as a third filter package wherein the individual filters have been integrated which third filter package have an input for input signals and a group of outputs separating the incoming signal to one of the frequency ranges and to the respective signal path to each of which outputs one amplifier of the second group of amplifiers is connected; and

the fourth group of bandpass filters are produced as a fourth filter package wherein the individual filters have been integrated which fourth filter package have a group of inputs corresponding to the signal paths to each of which inputs one amplifier of the second group of amplifiers is connected and an output for output signals for transmission.

5. A radio communication device according to claim 1 in which the filter groups and the amplifier groups consist of two parallel filters and amplifiers respectively and have two parallel signal paths.

6. A radio communication device according to claim 1 in which the filter groups and the amplifier groups consist of three parallel filters and amplifiers respectively and have three parallel signal paths.

7. A radio communication device, according to claim 1, wherein the duplexing means comprises a filter.

8. A radio communication device, according to claim 1, wherein the duplexing means comprises a switch.