Title:
FREQUENCY CONVERTER
Document Type and Number:
WIPO Patent Application WO/1984/003008
Kind Code:
A1
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 rectangular waveguide (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 higher than a local oscillation frequency, so that the 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:
SHIOMI YASUFUMI (JP)
YOSHIMURA YOSHIKAZU (JP)
YOSHIMURA YOSHIKAZU (JP)
Application Number:
PCT/JP1984/000004
Publication Date:
August 02, 1984
Filing Date:
January 13, 1984
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
International Classes:
H01Q1/24; H03D9/06; (IPC1-7): H03D9/06
Foreign References:
| JPS5225054B2 | 1977-07-05 | |||
| JPS5141306B1 | 1976-11-09 | |||
| JPS5141283B1 | 1976-11-09 | |||
| JPS5471916A | 1979-06-08 |
Other References:
See also references of EP 0131633A4
Download PDF: