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A bilaterally metal-loaded tri-plate line filter with a three-pole 0.1 dB ripple Chebyshev response was successfully designed and fabricated to realize a low loss printed filter at 30 GHz. It was obvious that the transmission characteristics of the filter was relatively unaffected by the skin effect of the under surface of the metal strips, because the two center conductors were the same voltage....
Although dielectric-supported tri-plate strip lines are usually used at centimeter frequencies, they suffer from a lot of transmission loss due to their rough under-surfaces of metal strips. And moreover, undesired radiation occurs in circuit elements such as a band-pass filter due to their asymmetrical structures. In this paper, we solved this problem by making center conductors on both surfaces...
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