Abstract
Applications of periodic dielectric multilayer (DML) filters in the microwave region are gaining popularity. One application of DML filters employed in this context is to steer the main lobe within the range of the second-order spectral component. A narrowband performance can be achieved using DML filters but the inherent dielectric loss of commonly used materials (e.g. RT/Duroid) generates a net transmission loss at resonance of undesirable size. A gradient optimization routine is used here to obtain maximum signal transmission at a chosen frequency. The optimization process entails varying the thicknesses of the low permittivity layers to compensate for the loss introduced by the high permittivity layers. An increase of up to 2 dB in transmission has been achieved for a nine-layer filter composed of melamine and air, operating in the Ku band.
Published Version
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