| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 86 === In modern microwave communication system, especially in
satellite and mobile communications, we always require numerous
narrow band and high performance (low insertion loss, high
selectivity, linear phase) filters for such functions as picket
selection, preselection of a receiver front end, and suppression
of mixer spurious products. Because of numerously using, it
makes filter size, weight, and cost important considerations in
the design of RF subsystem. In this thesis, we use cross-
coupled mechanism to design a planar microwave filter which has
better performance and smaller size. The theory has been
verified by experiments. And the result have been summarized as
design guide rules which could be followed for similar work in
the future. Finally, several cross-coupled planar
microwave filters have been designed to discuss the effect of
the loss tangent of different substrate materials which have
been used to construct these filters. A cross-coupled planar
filter using hairpin line resonators has also been designed to
show the method to design the desire coupling coefficient
between resonators.
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