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EP0131633A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Frequency converter

Assignee: Panasonic Holdings Corp
•
Filing: 1984-01-13
•
Granted: —
•
Expires: 2004-01-13
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Abstract

Abstract An apparatus for converting frequency which is used as a converter which, for example, converts a microwave signal received from a satellite broadcast into a signal of a lower frequency, comprises a circular waveguide (12) into which a signal is supplied, a rectangularwaveguide (14) which is provided at its final end with a rectangular waveguide-to- microstrip line converter (15), and a circular-to-rectangular waveguide converter (13) connecting between the circular waveguide (12) and the rectangular waveguide (14). The diameter of the circular waveguide (12) is set so that the cut-off frequency of the circular waveguide (12) is lower than the frequency of the received signal and higherthan a local oscillation frequency, sothatthe circular waveguide (12) can act as a high-pass filter, to satisfy noise factor characteristics and increase the image-noise ratio, as well as reduce leakage of the local oscillation signal.

Inventors

  • 👤 Yasufumi Shiomi
  • 👤 Yoshikazu Yoshimura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 21:10
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D9/0641; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/247

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 114 words
A frequency converter comprising a circular waveguide unit, a rectangular waveguide unit possessing a rectangular waveguide-microstrip line converter unit in its final end, a circular-rectangular waveguide converter unit which connects said circular and rectangular waveguide units together, and a microwave integrated circuit which processes the reception signal fed through said rectangular waveguide-microstrip line converter unit and delivers as a signal of intermediate frequency, wherein the diameter of said circular waveguide unit is determined so that the cutoff frequency of said circular waveguide unit may be lower than the frequency of reception signal and higher than the local oscillation frequency so as to cause said circular waveguide unit to function as a high pass filter.
Claim 2
Dependent Claim 114 words
A frequency converter comprising a circular waveguide unit, a rectangular waveguide unit possessing a rectangular waveguide-microstrip line converter unit in its final end, a circular-rectangular waveguide converter unit which connects said circular and rectangular waveguide units together, and a microwave integrated circuit which processes the reception signal fed through said rectangular waveguide-microstrip line converter unit and delivers as a signal of intermediate frequency, wherein the diameter of said circular waveguide unit is determined so that the cutoff frequency of said circular waveguide unit may be lower than the frequency of reception signal and higher than the local oscillation frequency so as to cause said circular waveguide unit to function as a high pass filter.
Claim 3
Dependent Claim 35 words
A frequency converter as claimed in Claim 1 wherein the axis of said circular waveguide unit and that of rectangular waveguide unit are deviated in the direction of shorter side of said rectangular waveguide unit.
Claim 4
Dependent Claim 67 words
A frequency converter as claimed in'Claim 1 wherein the circular-rectangular waveguide converter unit is composed of a first step converter having a characteristic impedance of high impedance intended to convert TEll mode of circular waveguide unit to transmission mode TE 10 of rectangular waveguide unit, and a second step converter intended to convert this transmission mode TE 10 to another transmission mode TE 10 of lower impedance.
Claim 5
Dependent Claim 32 words
A frequency converter as claimed in Claim 1 wherein the circular-rectangular waveguide unit is composed of a taper waveguide having a proper angle with respect to the axis of circular waveguide unit.
Claim 6
Dependent Claim 32 words
A frequency converter as claimed in Claim 1 wherein part of all of H-wall of circular-rectangular waveguide converter unit and rectangular waveguide unit is composed of shield case of microwave integrated circuit.
Claim 7
Dependent Claim 38 words
A frequency converter as claimed in Claim 1 wherein part or all of H-wall of circular-rectangular waveguide converter unit and rectangular waveguide converter unit is composed of grounding plate of dielectric substrate used in the microwave integrated circuit.

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