Transmitting/receiving antenna, isolator, high-frequency oscillator, and high-frequency transmitter-receiver using the same
First Claim
1. A transmitting/receiving antenna comprising:
- a circulator having first, second and third transmission lines for transmitting a millimeter-wave signal which are radially connected to a peripheral edge portion of a magnetic element by first, second and third connecting portions, respectively, the circulator outputting a millimeter-wave signal inputted from one of the connecting portions, from either one of the connecting portions adjacent to the one connecting portion; and
an antenna connected to one end of the third transmission line the other end of which is connected to the third connecting portion, wherein a line length of the third transmission line is set so that δ
=±
π
in which δ
is a phase difference at a center frequency between a signal Wa, which is a millimeter-wave signal portion reflected via the third transmission line on the antenna and returned to leak to the second connecting portion, and a signal Wb, which is another millimeter-wave signal portion having leaked from the first connecting portion through the circulator to the second connecting portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A millimeter-wave transmitter-receiver uses an NRD guide as a fundamental configuration and includes a millimeter-wave signal oscillator, a pulse modulator, a circulator, an antenna and a mixer. In the millimeter-wave transmitter-receiver, a line length of a third dielectric guide is set so that δ=±π in which δ is a phase difference at a center frequency between a portion of a transmission millimeter-wave signal, which is reflected via a third dielectric guide on the leading end portion of the third dielectric guide and returned to leak to a third connecting portion of the circulator, and another portion of the millimeter-wave signal, which leaks from a first connecting portion to the third connecting portion of the circulator. It is possible to reduce the change in the mixer output and enhance the millimeter-wave transmission/reception performance.
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Citations
48 Claims
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1. A transmitting/receiving antenna comprising:
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a circulator having first, second and third transmission lines for transmitting a millimeter-wave signal which are radially connected to a peripheral edge portion of a magnetic element by first, second and third connecting portions, respectively, the circulator outputting a millimeter-wave signal inputted from one of the connecting portions, from either one of the connecting portions adjacent to the one connecting portion; and
an antenna connected to one end of the third transmission line the other end of which is connected to the third connecting portion, wherein a line length of the third transmission line is set so that δ
=±
π
in which δ
is a phase difference at a center frequency between a signal Wa, which is a millimeter-wave signal portion reflected via the third transmission line on the antenna and returned to leak to the second connecting portion, and a signal Wb, which is another millimeter-wave signal portion having leaked from the first connecting portion through the circulator to the second connecting portion. - View Dependent Claims (3, 5, 7)
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2. A transmitting/receiving antenna comprising:
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a pair of parallel flat plate conductors arranged in parallel at a spacing of one half or less of a wavelength of a millimeter-wave signal;
a circulator disposed between the parallel flat plate conductors on whose inner faces having two ferrite plates arranged to confront each other, the circulator having first, second and third dielectric guides for inputting/outputting the millimeter-wave signal which are radially connected to the peripheral edge portions of the two ferrite plates by first, second and third connecting portions, respectively, the circular outputting the millimeter-wave signal inputted from one of the connecting portions, from either one of the connecting portions adjacent to the one connecting portion; and
an antenna or a waveguide tube or primary radiator connected to the antenna, disposed on the parallel flat plate conductors, and connected to a through hole which is formed at a portion of one of the parallel flat plate conductors, the portion confronting a portion of the third dielectric guide one end of which is connected to the third connecting portion, in which portion electric field of a standing wave in an LSM mode is high, wherein a length from the one end to the portion confronting the through hole of the third dielectric guide is set so that δ
=±
π
in which δ
is a phase difference at a center frequency between a signal Wa, which is a millimeter-wave signal portion reflected via the third dielectric guide on the through hole and returned to leak to the second connecting portion, and a signal Wb, which is another millimeter-wave signal portion having leaked from the first connecting portion through the circulator to the second connecting portion. - View Dependent Claims (4, 6, 8)
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9. An isolator, comprising:
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a circulator having first, second and third transmission lines for transmitting a high-frequency signal which are connected radially with a peripheral edge portion of a magnetic element by first, second and third connecting portions, respectively, the circulator outputting a high-frequency signal inputted from one of the connecting portions, from either one of the connecting portions adjacent to the one connecting portion; and
a non-reflective terminator having one end connected to the third connecting portion and connected to the other end of the third transmission line, wherein a line length of the third transmission line is set so that δ
=±
π
in which δ
is a phase difference at a center frequency between signals Wa, which is a millimeter-wave signal portion reflected via the third transmission line on the non-reflective terminator and returned to leak to the first transmission line, and Wb, which is another millimeter-wave signal portion having leaked from the second transmission line through the circulator to the first transmission line. - View Dependent Claims (14, 18, 20, 22, 24, 26, 28, 30, 32)
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10. An isolator, comprising:
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first and second circulators each having first, second and third transmission lines for transmitting the millimeter-wave signal which are radially connected to a peripheral edge portion of a magnetic element by first, second and third connecting portions, respectively, the circulators each outputting a millimeter-wave signal inputted from one of the connecting portions, from either one of the connecting portions adjacent to the one connecting portion, the circulators being so connected that the second transmission line of the first circulator acts as the first transmission line of the second circulator; and
non-reflective terminators each having an end connected to the third connecting portion, the non-reflective terminators each being connected to the other end of the third transmission line, wherein frequency dependency of the isolation characteristics between a high-frequency signal transmitted from the first transmission line to the second transmission line and a high-frequency signal transmitted from the second transmission line to the first transmission line of the first circulator is different from frequency dependency of isolation characteristics between a high-frequency signal to transmit from the first transmission line to the second transmission line and a high-frequency to transmit from the second transmission line to the first transmission line of the second circulator. - View Dependent Claims (15, 19, 21, 23, 25, 27, 29, 31, 33)
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11. The isolator of cliam 10, wherein a line length of the third transmission line of each of the first and second circulators is set so that δ
- =±
π
in which δ
is a phase difference at a center frequency between signals Wa, which is a high-frequency signal portion reflected via the third transmission line on the non-reflective terminator and returned to leak to the first transmission line, and Wb, which is another high-frequency signal portion having leaked from the second transmission line through the circulator to the first transmission line.
- =±
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12. A high-frequency oscillator comprising:
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a pair of parallel flat plate conductors arranged in parallel at a spacing of one half of less of a wavelength of a high-frequency signal;
first and second circulators disposed between the parallel flat plate conductors, having two ferrite plates disposed to confront each other in an inner face of the parallel flat plate conductors, an inputting dielectric guide, disposed radially with respect to the two ferrite plates, for inputting high frequency signal, a terminating dielectric guide having a non-reflective terminator provided at a leading end thereof and an outputting dielectric guide for outputting a high-frequency signal inputted to the inputting dielectric guide, the first and second circulators being so connected to each other that the outputting dielectric guide of the first circulator acts as the inputting dielectric guide of the second circulator; and
a voltage-controlled oscillator connected to an input terminal to which the high-frequency signal of the inputting dielectric guide of the first circulator is inputted, wherein frequency dependency of isolation characteristics between the high-frequency signal to be transmitted from the inputting dielectric guide to the outputting dielectric guide and the high-frequency signal to be transmitted from the outputting dielectric guide to the inputting dielectric guide of the first circulator is different from frequency dependency of isolation characteristics between the high-frequency signal to be transmitted from the inputting dielectric guide to the outputting dielectric guide and the high-frequency signal to be transmitted from the outputting dielectric guide to the inputting dielectric guide of the second circulator. - View Dependent Claims (13, 16, 17)
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34. A high-frequency transmitter-receiver comprising:
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a high-frequency oscillator for generating a high-frequency signal;
a branching device connected to the high-frequency oscillator, for branching a high-frequency signal and outputting the branched high-frequency signals to one output terminal and the other output terminal;
a modulator connected to the one output terminal, for modulating the high-frequency signal branched to the one output terminal and outputting the transmission high-frequency signal;
a circulator having a first terminal, a second terminal and a third terminal around a magnetic element, for outputting a high-frequency signal inputted from one of the terminals in the recited order, from a next terminal adjacent to the one terminal and inputting an output from the modulator to the first terminal;
a transmitting/receiving antenna connected to the second terminal of the circulator; and
a mixer connected between the other output terminal of the branching device and the third terminal of the circulator, for mixing the high-frequency signal branched to the other output terminal and the high-frequency signal received by the transmitting/receiving antenna and outputting an intermediate-frequency signal, wherein a line length between the branching device and the modulator or a line length between the branching device on the side of the mixer and the modulator is set so that δ
=±
π
in which δ
is a phase difference at a center frequency between a signal Wa2, which is a high-frequency signal which passes through the modulator in the OFF state, and a signal Wb2, which is a high-frequency signal which passes the mixer and the circulator from the other output terminal of the branching device to the output terminal of the modulator and is reflected on the output terminal of the modulator. - View Dependent Claims (40, 43, 46)
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35. A high-frequency transmitter-receiver comprising:
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a high-frequency oscillator for generating a high-frequency signal;
a branching device connected to the high-frequency oscillator, for branching a high-frequency signal and outputting the branched high-frequency signals to one output terminal and the other output terminal;
a modulator connected to the one output terminal, for modulating the high-frequency signal branched to the one output terminal and outputting the transmission high-frequency signal;
a circulator having a first terminal, a second terminal and a third terminal around a magnetic element, for outputting a high-frequency signal inputted from one of the terminals in the recited order, from a next terminal adjacent to the one terminal and inputting an output from the modulator to the first terminal;
a transmitting/receiving antenna connected to the second terminal of the circulator; and
a mixer connected between the other output terminal of the branching device and the third terminal of the circulator, for mixing the high-frequency signal branched to the other output terminal and the high-frequency signal received by the transmitting/receiving antenna and outputting an intermediate-frequency signal, wherein a branching ratio R of the branching device is expressed by R=Pb1/Pa1 (R;
an real number of 0 or more) and is set to R<
1, in which Wa1 is a high-frequency signal to be outputted to one output terminal of the branching device, Pa1 is an intensity thereof, Wb1 is a high-frequency signal to be outputted to the other output terminal of the branching device and Pb1 is an intensity thereof. - View Dependent Claims (36, 37, 41, 44, 47)
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38. A high-frequency transmitter-receiver comprising:
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first and second circulators each having a first terminal, a second terminal and a third terminal around a magnetic element, for outputting a high-frequency signal inputted from one of the terminals, from either one of the terminals adjacent to the one terminal in the recited order;
a high-frequency oscillator connected to the first terminal of the first circulator, for generating a high-frequency signal;
a modulator connected between the second terminal of the first circulator and the first terminal of the second circulator, for transmitting the high-frequency signal to the side of the second circulator or for reflecting the high-frequency signal to the first circulator in response to a pulse signal;
a transmitting/receiving antenna connected to the second terminal of the second circulator; and
a mixer connected between the third terminal of the first circulator and the third terminal of the second circulator, for mixing the high-frequency signal reflected on the modulator and inputted from the third terminal of the first circulator and the high-frequency signal received by the transmitting/receiving antenna and inputted from the third terminal of the second circulator, and outputting an intermediate-frequency signal, wherein δ
=±
π
in which δ
is a phase difference at a center frequency between a signal Wa, which is a high-frequency signal which passes through the modulator in the OFF state, and a signal Wb, which is a high-frequency signal which passes the mixer and the second circulator from the third terminal of the first circulator to the output terminal of the modulator and is reflected on the output terminal of the modulator. - View Dependent Claims (39, 42, 45, 48)
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Specification