Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2000-09-27
2004-06-08
Urban, Edward F. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S334000, C455S327000
Reexamination Certificate
active
06748207
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power distributing and synthesizing device, and more particularly to a power distributing and synthesizing device for distributing or synthesizing high-frequency microwave power in communication equipment.
2. Description of the Related Art
A Wilkinson type power distributing and synthesizing device which distributes or synthesizes high-frequency power in the microwave band, is disclosed in Japanese Unexamined Patent Application Publication No. 7-263993. This device has the advantages of both simplicity of circuit configuration and impedance conversion capability.
FIG. 8
is an equivalent circuit diagram of a conventional Wilkinson type power distributing and synthesizing device: The power distributing and synthesizing device
50
comprises first and second transmission lines
51
and
52
, first, second and third signal terminals
531
-
533
, a resistor
54
, and capacitors
551
-
553
. The connection portion between one end of the first transmission line
51
and one end of the second transmission line
52
is used as a first signal terminal (synthesis terminal)
531
, the other terminal of the first transmission line
51
is used as a second signal terminal (distribution terminal)
532
, and the other terminal of the second transmission line
52
is used as a third signal terminal (distribution terminal)
533
. The second signal terminal
532
and the third signal terminal
533
are connected via the resistor
54
. The first to third signal terminals
531
-
533
are connected to a ground via the capacitors
551
-
553
.
When the power distributing and synthesizing device
50
is used as a distributor, a high-frequency signal is inputted to the first signal terminal
531
, and the inputted high-frequency signal is outputted from the second and third signal terminals
532
and
533
. On the other hand, when the power distributing and synthesizing device
50
is used as a synthesizer, high-frequency signals are inputted to the second and third signal terminals
532
and
533
, and the inputted high-frequency signals are outputted from the first signal terminal
531
.
Here, let the impedance of the circuit to be connected to the first signal terminal
531
be Z
1
, and the impedance of the circuits to be connected to the second and third signal terminals
532
and
533
be Z
23
. By setting the characteristic impedance of each of the first and second transmission lines
51
and
52
to (2·Z
1
·Z
23
)
1/2
, and the length of each of the first and second transmission lines
51
and
52
to &lgr;/
4
, impedance matching is realized between the power distributing and synthesizing device
50
and the circuits to be connected thereto. Also, by setting the characteristic impedance of the resistor
54
to 2·Z
23
, isolation between the second and third signal terminals
532
and
533
is realized.
However, in the above-described conventional power distributing and synthesizing device
50
, since the first to third signal terminals are each connected to the ground via capacitors, it is impossible to remove high-frequency signals at a particular frequency although it is possible to remove higher harmonics of the high-frequency signal inputted to a signal terminal of the power distributing and synthesizing device. As a result, a filter, a trap, or the like needs to be connected to each signal terminal. This requires components for constructing the filters, and raises a problem of inhibiting the size-reduction of the power distributing and synthesizing device.
Furthermore, when the attenuation characteristics of the filter, the trap, or the like to be connected to each of the signal terminals is insufficient, problems occur, in that the isolation between the synthesis terminal and the distribution terminals deteriorates, and that thereby the performance of communication equipment using this power distributing and synthesizing device also deteriorates.
SUMMARY OF THE INVENTION
The present invention is able to solve such problems associated with the conventional art, and to provide a power distributing and synthesizing device capable of removing high-frequency signals at a particular frequency, and at the same time capable of sufficiently securing isolation between the synthesis terminal and the distribution terminals.
To solve the above-described problems, the present invention provides in its first aspect a power distributing and synthesizing device comprising first and second transmission lines; a synthesis terminal constituted of the connection portion between one end of the first transmission line and one end of the second transmission line; a first distribution terminal constituted of the other end of the first transmission line; a second distribution terminal constituted of the other end of the second transmission line; a resistor connected between the first distribution terminal and the second distribution terminal; and at least one LC serial resonator comprising an inductor and a capacitor. In this power distributing and synthesizing device, at least one terminal among the synthesis terminal, the first distribution terminal, and the second distribution terminal is connected to the ground via the at least one LC serial resonator.
Also, the present invention provides in its first aspect a power distributing and synthesizing device further comprising a laminated body formed by laminating a plurality of dielectric layers; strip line electrodes provided within the laminated body; and via hole electrodes provided within the laminated body. In this power distributing and synthesizing device, each of the first and second transmission lines is formed of the strip line electrodes; the inductor is formed of at least one of a strip line electrode and a via hole electrode; and the capacitor is formed of a plurality of electrodes formed within the laminated body so as to be opposed to each other across the dielectric layers.
The present invention provides in its second aspect a power distributing and synthesizing device comprising first and second transmission lines; a synthesis terminal constituted of the connection portion between one end of the first transmission line and one end of the second transmission line; a first distribution terminal constituted of the other end of the first transmission line; a second distribution terminal constituted of the other end of the second transmission line; a resistor connected between the first distribution terminal and the second distribution terminal; and at least one LC serial resonator comprising an inductor and a capacitor. In this power distributing and synthesizing device, a capacitor is connected in parallel with at least one of the first and second transmission lines.
Also, the present invention provides in its second aspect a power distributing and synthesizing device further comprising a laminated body formed by laminating a plurality of dielectric layers; and strip line electrodes provided within the laminated body. In this power distributing and synthesizing device, each of the first and second transmission lines is formed of the strip line electrodes; and the capacitor is formed of a plurality of electrodes formed within the laminated body so as to be opposed to each other across the dielectric layers.
Furthermore, in the power distributing and synthesizing device in according with the present invention, each of the strip line electrodes forming said first and second transmission lines may have a helical coil shape.
In the power distributing and synthesizing device in accordance with the first aspect of the present invention, since an LC serial resonator is connected between at least one terminal among the synthesis terminal, the first distribution terminal, and the second distribution terminal and the ground, it is possible to generate an attenuation pole by a serial resonance of the LC serial resonator, in the vicinity of the resonance frequency of an inputted signal. This allows high-frequency signals in the vicinity of the resonance frequency to be remo
Bando Tomoya
Tochigi Makoto
Tonegawa Ken
Chow C.
Dickstein Shapiro Morin & Oshinsky LLP.
Murata Manufacturing Co. Ltd.
Urban Edward F.
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