Miniature UHF-Band microstrip filter based on a high-permittivity ceramic material

The miniaturization of embarked devices remains a major concern in the space sector. Alternative solutions based on the use of new ceramic materials with very high dielectric permittivity, enhanced electric properties and high temperature stability are worth being investigated. This paper reports on the design of an UHF-microstrip bandpass filter with drastic specifications and based on such a dielectric substrate of relative permittivity ε_r = 90. Simulation and measurement results highlight some of the possibilities offered by these particular materials.