Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1995-05-18
1998-04-07
Lee, Benny
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
333202, 333206, 333222, 333134, H01P 1213, H01P 1202, H04B 150
Patent
active
057376964
ABSTRACT:
A dielectric filter includes a first dielectric block having a through bore extending between first and second end faces thereof and a plurality of side surfaces extending between those end faces. Substantially all of the surface area of the end faces, the side surfaces and the bore are covered with a conductive film to define a first dielectric resonator whose magnetic energy varies in the direction of an axis of the through bore. A first coupling window is formed in the conductive film on a first one of the side surfaces of the first dielectric block for coupling an input signal applied thereto to the first dielectric resonator. A second coupling window is formed on a second one of the side surface of the first dielectric block in a location wherein the magnetic energy in the first dielectric block is at a relatively high level so that magnetic energy in the first dielectric block exits the first dielectric block via the second coupling window. A second dielectric block has a through bore extending between first and second end faces thereof and a plurality of side surfaces extending between the first and second end faces of the second dielectric block. Substantially all of the surface area of the end faces, the side surfaces and the bore of the second dielectric block are covered with a conductive film to define a second dielectric resonator. A first side surface of the second dielectric block abuts the second side surface of the first dielectric block. A third coupling window is formed on the first side surface of the second dielectric block at a location corresponding to the second coupling window such that magnetic energy leaving the first dielectric block via the second coupling window enters the second dielectric block via the third coupling window and sets up a magnetic field in the second dielectric block whose magnetic energy varies in the direction of the through bore of the second dielectric block. A fourth coupling window is formed on a second one of said the surfaces of the second dielectric block at a location where the resonant magnetic energy in the second dielectric block is relatively high such that magnetic energy in the second dielectric block leaves the dielectric block via the fourth coupling window.
REFERENCES:
patent: 4179673 (1979-12-01), Nishikawa et al.
patent: 5130683 (1992-07-01), Agahi-Kesheh et al.
Hano, K and Sawamoto K-1, "A Bandpass Filter Using Direct-Coupled Quarters Wavelength Coaxel Dielectric Resonators"; Microwave Journal; Nov. 1987; pp. 141-160.
Lee Benny
Murata Manufacturing Co. Ltd.
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