SUMMARY Two compact and low loss dual-mode
filters are proposed
by using degenerate modes of slotted triangular
microstrip patch resonators.
The geometrical size and radiation loss of the
triangular patch
are reduced simultaneously by loading both
horizontal and vertical slots.
The resonant frequencies of two degenerate modes
can be easily controlled
by varying the dimensions and positions of the
slots. A two-pole dualmode
filter operating at 3.94 GHz with a fractional
bandwidth of 4.3% is
designed, fabricated, and measured. The measured
results verify well the<
theoretical predictions.
key words: dual-mode filter, microstrip filter,
size-reduction, triangular patch resonator
・
Dual-Mode Bandpass Filters Using Microstrip
Slotted Equilateral Triangular Patch Resonators
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