Ku-Band 3D LTCC Filter and BST-Varactor based Temperature Compensated Resonator

Inhalt:
In this paper, a two-pole cavity resonator filter intended for UAV data-link at Ku-band is demonstrated. The design of the filter realised with LTCC integrated cavity resonators is described and validated by good agreement between specifications and measurements. The unloaded Q-factor of the proposed substrate integrated cavity resonator is assessed and the influence of the different lossy mechanisms present in the resonator is discussed. Finally, the RF-behaviour of a weakly-coupled doubly-terminated cavity resonator is investigated over temperature. A solution implementing a ferroelectric varactor coupled to the cavity resonator is assessed for the compensation of the shift of the resonance frequency observed for the substrate integrated resonator. The unloaded Q-factor of the temperature compensated resonator is measured and compared to the one of the un-compensated cavity.