This paper proposes cylindrical low temperature cofired ceramic (LTCC) resonator configurations as a means of achieving high-Q values at millimetric frequencies in a reduced-size structure. Cylindrical resonator geometries with via walls are compared with rectangular structures, showing a nearly 50% saving in circuit area. A design strategy for obtaining high-Q factors using appropriate loss-reduction and feeding techniques is described. A novel high-Q cylindrical resonator implementation is then carried out, yielding an unloaded Q of 840 at K-band. which is among the highest values ever reported using a standard LTCC process. Excellent agreement was obtained between EM modeling and measurements.

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Keywords Ceramics, LTCC, Millimeter wave resonators, Multilayered resonators, Packaging, Q factor
Conference 2004 IEEE MITT-S International Microwave Symposium Digest
El-Tager, A. (Ayman), & Roy, L. (2004). Novel cylindrical high-Q LTCC resonators for millimeter wave applications. In IEEE MTT-S International Microwave Symposium Digest (pp. 637–640).