Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1997-03-28
2001-01-16
Hunter, Daniel S. (Department: 2749)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S102000, C455S180100, C455S076000
Reexamination Certificate
active
06175746
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multiband mobile unit communication apparatus.
2. Description of the Prior Art
A mobile unit communication apparatus for communicating with a third party through a base station and a network is known.
Such a mobile unit communication apparatus is disclosed in Japanese patent application provisional publication No. 6-132849 as RADIO EQUIPMENT AND PORTABLE TELEPHONE SET.
FIG. 3
is a block diagram of this prior art mobile unit communication apparatus. In this prior art mobile unit communication apparatus, a smaller number of local oscillators are used. To provide transmission and reception through different frequencies respectively, a local oscillator
11
capable of directly or indirectly oscillating a fundamental wave and its multiple wave is used, and a local oscillator
6
is used for transmission and reception commonly.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide an improved multiband mobile unit communication apparatus.
According to the present invention, a first multiband mobile unit communication apparatus is provided, which comprises: an antenna for receiving first and second frequency bands of radio wave signals modulated by the same modulating method; a local oscillation signal generation circuit for generating a local oscillation signal; a first mixer for mixing the received first frequency band of radio wave signal with the local oscillation signal; a second mixer for mixing the received second frequency band of radio wave signal with the local oscillation signal; a switch for supplying an output from the first mixer in a first mode and supplying an output from the second mixer in a second mode; and a filter for filtering an output of the switch and outputting a first intermediate frequency signal in the first mode and a second intermediate frequency signal in the second mode, the local oscillation signal generation circuit generating the local oscillation signal such that the first intermediate frequency signal has the same frequency as the second intermediate frequency signal.
According to the present invention, a second multiband mobile unit communication apparatus is provided which comprises: an antenna for receiving L frequency bands of M radio wave signals modulated by N modulating methods, L, M, and N being natural numbers, M>L, M>N, N≧2; a frequency synthesizer for generating a local oscillation signal; an intermediate frequency signal generation circuit for generating M intermediate frequency signals using the local oscillation signal, the frequency synthesizer generating the local oscillation signal such that the M intermediate frequency signals have the same intermediate frequency; a switching circuit for selectively outputting N intermediate frequency signals modulated by the N modulating methods respectively out of the M intermediate frequency signals; and N filters for filtering outputs of N intermediate frequency signals from the switching circuit and outputting N filtered intermediate frequency signals respectively.
The second multiband mobile unit communication apparatus may further comprise a switching circuit responsive to a switching control signal for selectively outputting one of the N filtered intermediate frequency signals and a quadrature demodulator for quadrature-demodulating one of N filtered intermediate frequency signals and outputting baseband signal.
According to the present invention, a third multiband mobile unit communication apparatus is provided which comprises: an antenna for receiving L frequency bands of M radio wave signals modulated by N modulating methods, L, M, and N being natural numbers, M>L, M>N, N≧L; a frequency synthesizer for generating a local oscillation signal; an intermediate frequency signal generation circuit for generating M intermediate frequency signals using the local oscillation signal, the frequency synthesizer generating the local oscillation signal such that the M intermediate frequency signals have the same intermediate frequency; a switching circuit for selectively outputting N intermediate frequency signals modulated by the N modulating methods respectively out of the M intermediate frequency signals; N filters for filtering outputs of N intermediate frequency signals from the switching circuit and outputting N filtered intermediate frequency signals respectively; a switching circuit responsive to a switching control signal for selectively outputting one of the N filtered intermediate frequency signals; and a quadrature demodulator for quadrature-demodulating one of N filtered intermediate frequency signals and outputting baseband signal.
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patent: 5369790 (1994-11-01), Yokota
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patent: 1550697 (1979-08-01), None
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patent: 6132849 (1994-05-01), None
Aihara Yukichi
Kosugi Hiroaki
Nakayama Keiichi
Sasaki Fujio
Yamaguchi Seiichi
Armstrong Darnell R.
Hunter Daniel S.
Matsushita Electric - Industrial Co., Ltd.
Pollock Vande Sande & Amernick
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