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An integrated low-temperature co-fired ceramic (LTCC) coupled resonator decoupling network (CRDN) for two coupled antennas is proposed in this paper. By virtue of LTCC technology, a second-order CRDN is realized by two tightly coupled lumped-element resonators in a volume of \3.2\times \2.5\times \1.2\ \mm^3. Theoretical analysis has revealed that a wide range of mutual admittance of a CRDN can be realized by choosing appropriate I/O coupling elements while the coupled resonators can be consolidated in an LTCC device. This “one-fit-all” feature allows for decoupling a wide range of coupled antennas with different form factors for a given frequency band. To prove the concept, two LTCC CRDNs for decoupling different forms of antennas working in the 2.45-GHz band are designed, fabricated, and tested. Measurement results have demonstrated that significant improvement in isolation can be achieved within a wide operating frequency range in all cases. The presented design theory and circuit topology are general and can be applied to both symmetric and asymmetric two-element antenna arrays. [ABSTRACT FROM PUBLISHER]

A new phased-array driver module for a two-antenna array is proposed in this paper. This driver, designed using a six-port phase discriminator, automatically controls the phase of one antenna-array element in order to maximize the received power. The results for a phased two-antenna array operating at 2.45 GHz are presented and discussed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 346–349, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20983 [ABSTRACT FROM AUTHOR]

A novel configuration of millimeter-wave planar array antenna based on low-temperature cofired ceramic (LTCC) technology is investigated. The configuration exploits the three-dimensional (3-D) integration feature of LTCC by incorporating a novel quasi-cavity-backed patch (QCBP) element using a pair of grid-like conductor walls and a mixed feeding network configuration. A proposed LTCC planar array antenna consisting of 16 by 16 elements is designed, manufactured and tested. Good agreement is achieved between the theoretical performance and the measured results. [ABSTRACT FROM AUTHOR]