Radio frequency coupler apparatus suitable for use in a...

Details Radio frequency coupler apparatus suitable for use in a... Radio frequency coupler apparatus suitable for use in a...

1999-09-15

2002-12-17

Kincaid, Lester G. (Department: 2685)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S115200, C455S127500, C333S109000, C330S126000

Reexamination Certificate

active

06496708

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to signal couplers, and more particularly to a radio frequency (RF) coupler apparatus suitable for use in a multi-band wireless communication device, such as a dual band wireless telephone.
BACKGROUND OF THE INVENTION
A dual band wireless telephone is capable of operating in two communication systems, each characterized by a different frequency band. One existing dual band wireless telephone operates in both the Global Standard for Mobile (GSM) digital system by transmitting RF signals in a frequency band from 890 MHz to 915 MHz (“GSM 900”) and the GSM 1800 digital system by transmitting RF signals in a frequency band from 1710 MHz to 1785 MHz (“GSM 1800”). Another existing dual band wireless telephone operates in both the Advanced Mobile Phone Service (AMPS) analog system by transmitting RF signals in a frequency and from 824 MHz to 849 MHz (“AMPS 800”) and the 1900 MHz Time Division Multiple Access (TDMA) IS-136 digital system by transmitting RF signals in a frequency band from 1850 MHz to 1910 MHz (“TDMA 1900” or “D-AMPS 1900”).
Prior art transmitter circuitry
100
of a dual band wireless telephone is shown in FIG.
1
. The transmitter circuitry
100
includes RF power amplifier
102
to amplify RF signals in a first frequency band TX BAND
1
for transmission at an antenna, and RF power amplifier
103
to amplify RF signals for transmission in a second frequency band TX BAND
2
at the antenna. To measure the power level of the transmitted RF signals, the transmitter circuitry
100
uses a RF coupler apparatus
104
with two separate transmission line coupling structures
106
and
107
, which are coupled in parallel at a summing junction
108
via respective detection diodes
110
and
111
of a RF power detector
109
. Each of the coupling structures
106
and
107
have a coupler (i.e., couplers
112
and
113
) and a termination device (i.e., termination devices
114
and
115
). The RF power detector
109
outputs a RF detect signal, which has an amplitude related to the amplitude of the RF signals output by RF power amplifier
102
or
103
. The RF detect signal is used to control the power level at which the dual band wireless telephone transmits.
The RF coupler apparatus
104
requires that the RF power detector
109
include one detection diode per coupling structure. It can be appreciated that when the dual band wireless telephone is portable or hand-held, an important goal is to minimize component count. Modifying the RF power detector
109
by moving the summing junction
108
to the input of the RF power detector
109
(i.e., to the anode of detection diode
110
) and removing the detection diode
111
would result in an unacceptable RF voltage loss at the input of the RF power detector
109
and a reduction in the sensitivity of the RF power detector
109
. Therefore, what is needed is a RF coupler apparatus that is suitable for use in a multi-band wireless communication device and reduces duplication of components in an RF power detector.


REFERENCES:
patent: 4809356 (1989-02-01), Peckham et al.
patent: 5006821 (1991-04-01), Tam
patent: 5363071 (1994-11-01), Schwent et al.
patent: 5448771 (1995-09-01), Klomsdorf
patent: 5698819 (1997-12-01), Brockett et al.
patent: 5732330 (1998-03-01), Anderson et al.
patent: 5794159 (1998-08-01), Portin
patent: 5884149 (1999-03-01), Jaakola
patent: 5974305 (1999-10-01), Matero
patent: 6216012 (2001-04-01), Jensen
patent: 0 878 917 (1998-11-01), None
“Cellular South Launches 1900 MHz TDMA Network in Jackson, Miss.”, Nortel Networks web site, Jan. 20, 1999.
“Ericsson unveils plans for industry's first ‘world phones’ capable of offering unparalleled global roaming”, Mobile Softline web page, Aug. 16, 1999, originally published by Ericsson 2ndquarter, 1998.
Digital Market Forecasts Table of Contents, PR Guide web site (4 sheets), published Dec. 1996.
“Orange Roaming”, Mobiles Co. web site (2 sheets), updated Apr. 22, 1999.
Bennett, G. “The New PCS Phones”, TCP web site (3 sheets), updated May 21, 1998.

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