A text book written by Hector J. De Los Santos, Introduction to
Microelectromechnical Microwave Systems will be a good start.  Also, check out
RF mems link under www.coventor.com.  Several tutorial papers (also written by
the same author) and other technical papers might be helpful, too.   It is not a
trivial matter to design a good RF switch by studying the effect of design
parameters and making necessary trade-offs.  A commercial simulation tool can
help you in this regards.  I know there is MEMS Design House at KIST in Korea,
where it allows you to use some tools per usage basis if you are a student.
Hope it helps.
William
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