Microstrip and Suspended Substrate
Suspended Substrate Stripline (SSS) is a printed circuit technology that can be used for both broadband and narrowband filters from 500MHz to 40GHz.
The basic configuration for SSS consists of a photo etched microwave circuit on a thin PTFE based substrate suspended in air between two silver plated ground planes. Plated through holes in the non cavity areas provide an effective means of grounding the top and bottom halves of the housing and suppress any RF leakage, this then provides high performance in terms of high-Q and low Insertion Loss, combined with a small, lightweight yet rugged construction. SSS allows the full range of filter structures, including lowpass, highpass, bandpass, bandstop and multiplexers to be configured.
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