Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
1999-04-06
2001-12-18
Urban, Edward F. (Department: 2683)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S083000, C333S101000
Reexamination Certificate
active
06332071
ABSTRACT:
This application claims priority under 35 U.S.C. §§119 and/or 365 Application No. 9801209-9 filed in Sweden on Apr. 7, 1998; the entire content of which is hereby incorporated by reference.
FIELD OF THE INVENTION
The present invention relates to an antenna switch comprising at least one signal path, and more particularly to an integrated antenna switch having both amplifier means and switching means in each path.
BACKGROUND
Great efforts have been made to meet the requirements of performance and compactness of mobile and portable phones.
As the requirements for mobile phones of even smaller size increase, the requirements of better performance, more functions and services increase at the same time. Consequently, more and more components have to fit in on an even smaller area or space in the portable phone. An increased number of components also cause increased electrical losses.
Every mobile phone is provided with some kind of antenna switch for switching between transmitting and receiving of signals using at least one antenna. Prior known antenna switch stages are divided in two separate substeps or components. The first step is an amplifier step which is connected to the successive switching step.
FIG. 1
shows a prior art single band antenna switch, comprising an amplifier component and a switching component both components including several bulky components, such as inductors, PIN diodes, capacitors and filters, which cause losses in the switch. Particularly, this is more apparant in a dual band system having another signal path.
SUMMARY
It is therefore an object of the present invention to provide an improved antenna switch which reduces the above-mentioned problems with several bulky components causing losses in the system.
The object of the present invention of reducing the number of components in the switch is obtained by an integrated antenna switch component having both amplifier means and switching means in each path.
Further, in order to reduce the required component area a microstrip is used as impedance means in the antenna switch and suitable adjustment of other components in the switch is performed.
In the integrated antenna switch the switching means is supplied by the same DC-feed as the power amplifiers, wherein components such as inductors and capacitors become unnecessary for the function of the antenna switch and are removed.
In order to connect two signal paths of a dual band antenna switch to the same antenna both paths are connected to the antenna through frequency band selecting means such as a diplexer.
The number of components is even more reduced by removing the low pass filter in each path and attaching the low pass filter between the diplexer and the antenna.
The diplexer is designed to let through only high band signals in the high band path and prevent low band signals to leak into the high band path. Similarly, the low band path lets through low band signals and prevents high band signals to leak into the low band path.
The advantages of the present invention is that the number of components used in the antenna switch is reduced and a reduction of losses in the transmission is obtained.
REFERENCES:
patent: 5507011 (1996-04-01), Chigodo et al.
patent: 5584053 (1996-12-01), Kommrusch et al.
patent: 5634200 (1997-05-01), Kitakubo et al.
patent: 0 823 751 (1998-02-01), None
patent: 97/10621 (1997-03-01), None
patent: 97/32353 (1997-09-01), None
Burns Doane Swecker & Mathis L.L.P.
Telefonaktiebolaget LM Ericsson
Urban Edward F.
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