Thin film layered electrode for 2 GHz band cellular base station

Efficient computation of a high-Q resonator realized by a thin-film multilayer metal/dielectric structure

“…The Q-factor is normally limited to a few hundred, mainly due to the finite conductivity of metal. This can be significantly increased by using a multilayer structure with metal/dielectric pairs realized in thin-film technology [1,2]. This need to be accurately analyzed in order to search for optimum performance.…”

“…This need to be accurately analyzed in order to search for optimum performance. The method in [1] is based on the assumption of an existing TM resonator. The complete structure is modeled as a circuit and is solved using a transfer-matrix approach that does not account for the horizontal dimensions.…”

“…Therefore, the dielectric/ metal pairs are modeled as detuned resonators (operating in a frequency outside their resonant frequency). The horizontal dimensions were included in the analysis in [2], which therefore could predict changes in both the Q-factor and resonance frequency, as verified in [1]. This approach is similar to the analysis of the single-layer resonator in [3].…”

“…Finiteness in the other directions cannot be handled by the original G1DMULT version, but we will handle this by assuming that the resonator is bounded by magnetic walls, so that imaging can be used. This is quite common in similar analyses, for example, of microstrip antennas, and was also used in [1,2].…”

“…The multilayer thin-film conductor structure in [1] was applied to replace the bulk conductors in parallel-plate resonators. The significant increase in Q-factor may be utilized in microwave filters based on patch/parallel-plate resonators in order to reduce the insertion loss [1].…”