Patent ID: 6580339
Filing Date: 2003-06-17
Classification: H01P

Abstract:
A dielectric duplexer, comprising:a dielectric block having an outer surface including top, bottom, front and rear surfaces; a plurality of plated through holes extending through the dielectric block between the front to the rear surfaces thereof, each of the plated through holes having a respective inner conductor formed on an inner surface thereof; an antenna excitation hole extending through the dielectric block from the front to the rear surface thereof, the antenna excitation hole having an electrode formed on an inner surface thereof; an outer conductor located on the outer surface of the dielectric block and being directly connected to the inner conductors at the front surface of the dielectric block; input/output terminals located on the outer surface of the dielectric block and being spaced from the outer conductor; an antenna terminal located on the front surface and being directly coupled to the antenna excitation hole electrode, the antenna terminal being separated from the outer conductor by a conductorless area extending from the front to the bottom surfaces of the dielectric block; and means for adjusting the relative flow of current through the outer conductor between the inner electrode of a first one of the plated through holes which is located adjacent the antenna terminal and the upper and lower surfaces of the dielectric block so as to cause the two current flows to be substantially equal.