Planar Filters Continue to Advance
A primary goal of every RF subsystem today is size reduction without reducing performance and without increasing cost — while operating at millimeter-wave frequencies that have been only sparsely occupied until now. So, it is interesting that long before surface acoustic wave (SAW) and bulk acoustic wave (BAW) technologies reduced the achievable size of filters by orders of magnitude, the microstrip filter has been doing the same thing since 1952. They remain one of the most important types of filters in engineers’ toolkits, and they have been enhanced over the years through the use of various dielectric substrate materials and design techniques.
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