Waveguide to microstrip transducer having a ridge waveguide and an impedance matching box
First Claim
1. A waveguide structure comprising:
- a microstrip line;
a waveguide; and
a transmission mode transducer provided between the microstrip line and the waveguide,wherein the transmission mode transducer comprises a waveguide transducer,wherein the waveguide transducer is a ridged waveguide,wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line,wherein a length of a shorter side of a rectangular cross-section opening of the ridged waveguide is twice or more than twice a thickness of a dielectric of the microstrip line, andwherein a ridge is provided near a center of one or both long sides of the ridged waveguide rectangular cross-sectional opening, projecting toward the center of the rectangular opening, wherein a distance from the ridge to the nearest part of the rectangular opening is twice or less than twice the thickness of the dielectric.
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Accused Products
Abstract
When a microstrip line is connected with a waveguide, there is a limit to reducing the connection loss by using only a matching box. We have discovered that in a transmission mode line transducer for converting between the TEM waves of the microstrip line and the TE01 waves of the waveguide, if the cross-sections of the microstrip line and the waveguide are substantially the same size, in the case of a 50Ω microstrip line when the characteristic impedance of the waveguide is about 80%, i.e., 40Ω, the line conversion loss can be optimized. Therefore, according to the present invention, the microstrip line is connected with the waveguide using a λ/4 matching box by means of a ridged waveguide having a low impedance and a length of λ/16 or less.
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Citations
20 Claims
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1. A waveguide structure comprising:
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a microstrip line; a waveguide; and a transmission mode transducer provided between the microstrip line and the waveguide, wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line, wherein a length of a shorter side of a rectangular cross-section opening of the ridged waveguide is twice or more than twice a thickness of a dielectric of the microstrip line, and wherein a ridge is provided near a center of one or both long sides of the ridged waveguide rectangular cross-sectional opening, projecting toward the center of the rectangular opening, wherein a distance from the ridge to the nearest part of the rectangular opening is twice or less than twice the thickness of the dielectric. - View Dependent Claims (2)
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3. A waveguide structure comprising:
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a microstrip line; a waveguide; and a transmission mode transducer provided between the microstrip line and the waveguide, wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line, and wherein a length of a shorter side of a rectangular cross-sectional opening of the ridged waveguide is twice or more than twice a thickness of a dielectric of the microstrip line, the microstrip line further comprising; an RF circuit; and a λ
/4 matching box connected between the waveguide and the waveguide transducer,wherein the waveguide structure constitutes input/output terminals for externally connecting the waveguide structure, wherein the microstrip line constitutes a millimeter waveband data line of the RF circuit, and wherein a characteristic impedance of the λ
/4 matching box is an intermediate value between the characteristic impedance of the microstrip line and a characteristic impedance of the waveguide. - View Dependent Claims (4)
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5. A waveguide structure comprising:
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a microstrip line; a waveguide; and a transmission mode transducer provided between the microstrip line and the waveguide, wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line, and wherein the microstrip line is connected to the waveguide transducer at a right angle, the waveguide structure further comprising; an RF circuit; and a λ
/4 matching box connected between the waveguide and the waveguide transducer,wherein the waveguide structure constitutes input/output terminals for externally connecting the waveguide structure, wherein the microstrip line constitutes a millimeter waveband data line of the RF circuit, and wherein a characteristic impedance of the λ
/4 matching box is an intermediate value between the characteristic impedance of the microstrip line and a characteristic impedance of the waveguide. - View Dependent Claims (6, 7)
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8. A waveguide structure, comprising:
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a multilayer substrate; and a heat transfer plate laminated on the multilayer substrate; wherein, on the multilayer substrate are provided, a microstrip line, a transmission mode transducer connected between the microstrip line and a waveguide, and a first λ
/4 matching box,wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, wherein a characteristic impedance of the waveguide transducer of the transmission mode transducer is equal to or less than a characteristic impedance of the microstrip line, wherein a characteristic impedance of the first λ
/4 matching box is a higher impedance than a characteristic impedance of the transmission mode transducer and the characteristic impedance of the microstrip line, and is a lower impedance than a characteristic impedance of the waveguide, andwherein a second λ
/4 matching box of a conductive conductor, having a lower impedance than the characteristic impedance of the waveguide and a higher impedance than the characteristic impedance of the first λ
/4 matching box, is formed in the heat transfer plate. - View Dependent Claims (9)
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10. A waveguide structure comprising:
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a microstrip line; a waveguide; and a transmission mode transducer provided between the microstrip line and the waveguide, wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, and wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line, the waveguide structure further comprising; a multilayer substrate; and an RF circuit board, an RF circuit being provided on a top layer of the RF circuit board and the multilayer substrate; and a λ
/4 matching box provided adjacent to an inner layer of the multilayer substrate,wherein the waveguide transducer and a waveguide of the λ
/4 matching box are of a waveguide shape extending through to an undersurface of the multilayer substrate by alternately laminated dielectric and metal conductor films, each metal conductor film having a cut-out portion and being electrically connected to an adjacent metal conductor film through at least one via. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A waveguide structure comprising:
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a microstrip line; a waveguide; and a transmission mode transducer provided between the microstrip line and the waveguide, wherein the transmission mode transducer comprises a waveguide transducer, wherein the waveguide transducer is a ridged waveguide, wherein a characteristic impedance of the waveguide transducer is equal to or less than a characteristic impedance of the microstrip line, wherein the waveguide structure further comprises a λ
/4 matching box connected between the transmission mode transducer and the waveguide, andwherein a characteristic impedance of the λ
/4 matching box is a higher impedance than the characteristic impedance of the transmission mode transducer and a characteristic impedance of the microstrip line, and is a lower impedance than a characteristic impedance of the waveguide. - View Dependent Claims (17, 18, 19, 20)
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Specification