Behaviour of Parallel Coupled Microstrip Band Pass Filter and Simple Microstripline due to Thin-Film Al2O3 Overlay

Behaviour of Parallel Coupled Microstrip Band Pass Filter and Simple Microstripline due to Thin-Film Al2O3 Overlay

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The X-band behaviour of a seven-section parallel-coupled microstrip band pass filter and microstripline due to thin-film Al2O3 overlay of different thickness is reported in this paper.This Al2O3 film can give a homogeneous overlay structure.There is a substantial increase in the bandwidth due to the overlay, the pass band extending towards higher frequency side.

In most of the gel bottle audrey the cases, an increase in the pass band transmittance of a microstripline also increases due to a thin-film Al2O3 overlay, especially for frequencies less than 9.0 GHz.At higher frequencies, random variations are observed.

It is felt that thin-film overlays can be domeless quartz nails used to modify the microstripline circuit properties, thereby avoiding costly and time consuming elaborate design procedures.