Dielectric resonator, filter, duplexer and communication device

Details Dielectric resonator, filter, duplexer and communication device Dielectric resonator, filter, duplexer and communication device

2005-06-07

2005-06-07

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S202000, C333S219100

Reexamination Certificate

active

06903627

ABSTRACT:
The present invention provides a dielectric resonator having increased reliability with respect to thermal cycle fatigue of a joint between a conductive cavity and a dielectric core disposed in the cavity without an increase in material cost and processing cost, a filter and duplexer each using the dielectric resonator, and a communication device including these devices. The dielectric resonator has a structure in which the dielectric core is provided in the cavity through earth plates. Each of the earth plates has slits provided at positions in contact with the four corners of each of two opposing side faces of the dielectric core. Of the four sides of each of the earth plates, the two sides provided with spring portions are preferably inclined so that the distance between the two sides decreases toward the bottom of the cavity, and concave portions are formed in the inner surface of the cavity corresponding to the two inclined sides. Therefore, solder cream can be previously applied to predetermined positions of the concave portions of the cavity.

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Copy of European Combined Search and Examination Report dated Jun. 5, 2003.
Copy of German Office Action dated Mar. 24, 2004 (and English translation of same).

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