Converter for satellite broadcast reception that secures isolation between vertically polarized waves and horizontally polarized waves

• US 20030058181A1
• Filed: 09/20/2002
• Published: 03/27/2003
• Est. Priority Date: 09/21/2001
• Status: Active Grant

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Sasaki, Kazuhiro, Nakagawa, Masashi, Dou, Yuanzhu
• Granted Patent: US 6,714,166 B2
• Time in Patent Office: Days
• US Class Current: 343/785
• CPC Class Codes: H01Q 1/247 with frequency mixer, e.g. for direct satellite reception or Doppler radar
• CPC Class Codes: H01Q 13/0258 Orthomode horns orthomode transducers H01P1/161
• CPC Class Codes: H01Q 19/08 for modifying the radiation pattern of a radiating horn in which it is located corrugated horns H01Q13/0208; producing a circular polarisation H01Q13/0241
• CPC Class Codes: H01Q 5/45 using two or more feeds in association with a common reflecting, diffracting or refracting device
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving

Abstract

Each of a first minute radiation pattern and a second minute radiation pattern is provided on a first circuit board so as to be inclined electrically by about 45° from the respective axial lines of a first probe for vertically polarized waves and a second probe for horizontally polarized waves. The first minute radiation pattern is approximately perpendicular to a phase conversion portion of a first dielectric feeder, and the second minute radiation pattern is approximately parallel with a phase conversion portion of a second dielectric feeder. The phase conversion portion of the first dielectric feeder is longer than that of the second dielectric feeder.

Claims

1. A converter for satellite broadcast reception having a pair of hollow waveguides, first and second dielectric feeders held by the respective waveguides, and a circuit board that is disposed perpendicularly to axial lines of the respective waveguides in which left-handed and right-handed circularly polarized waves transmitted from each of two satellites adjacent to each other enter a radiation portion of one of the first and second dielectric feeders and are converted by a phase conversion portion of the one of the first and second dielectric feeders into vertically polarized waves and horizontally polarized waves, respectively, which are input to a probe for vertically polarized waves and a probe for horizontally polarized waves, respectively, the converter comprising:

a first minute radiation pattern and a second minute radiation pattern each being provided on the circuit board so as to be inclined electrically by about 45°

from respective axial lines of the probe for vertically polarized waves and the probe for horizontally polarized waves, the first minute radiation pattern being approximately perpendicular to the phase conversion portion of the first dielectric feeder, the second minute radiation pattern being approximately parallel with the phase conversion portion of the second dielectric feeder,

wherein the phase conversion portion of the first dielectric feeder is longer than that of the second dielectric feeder.

2. The converter for satellite broadcast reception according to claim 1, wherein one of a first pair of signal lines that are connected to the respective probes for vertically polarized waves and a second pair of signal lines that are connected to the respective probes for horizontally polarized waves is disposed close to the center of the circuit board, and the other is disposed outside the one pair.

3. The converter for satellite broadcast reception according to claim 1, wherein each of the first and second dielectric feeders is composed of a first divisional body having the radiation portion and a second divisional body having the phase conversion portion, and the first and second divisional bodies are integrated with each other by inserting a projection that is provided in the second divisional body into a through-hole that is formed in the first divisional body.

4. The converter for satellite broadcast reception according to claim 3, wherein the second divisional body has an impedance conversion portion that assumes arcs in cross section that become closer to each other as the position goes away from an open end of the waveguide toward the phase conversion portion, the projection projects from an end face of the impedance conversion portion, and the first and second divisional bodies are joined to each other at the end face of the impedance conversion portion.

5. The converter for satellite broadcast reception according to claim 3, wherein at least one of the two respective second divisional bodies of the first and second dielectric feeders is provided with an identification mark that allows the two second divisional bodies to be discriminated from each other visually.

6. The converter for satellite broadcast reception according to claim 5, wherein the identification marks are provided in such a manner that the second divisional bodies of the first and second dielectric feeders are molded so as to assume different colors.