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This letter proposes a compact self-packaged balun using compensated interdigital capacitor (CIDC) based on substrate integrated suspended line (SISL) platform. Compared with traditional single-layer interdigital capacitor or parallel-plate capacitor, CIDC has higher capacitance density and thus the circuit size can be reduced. Using the CIDC, a compact SISL balun based on a modified second-order...
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