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This letter proposes a compact single-layer balanced bandpass filter (BPF), which is realized by a new arrangement of eighth-mode substrate integrated waveguide (EMSIW) cavities. Under differential-mode (DM) operation, the half bisection topology of the proposed EMSIW filter can be equivalent to a quadruplet scheme based on four coupled EMSIW cavities. The negative cross coupling can be easily realized by the nature of the fringe electric fields of opened ends of EMSIW cavities. For the demonstration, a balanced EMSIW filter with the operating frequency at 2.4GHz is designed, fabricated, and measured.

COMPACT SINGLE-LAYER BALANCED EIGHTH-MODE SUBSTRATE INTEGRATED WAVEGUIDE BANDPASS FILTER WITH HIGH SELECTIVITY