Abstract
A new type of planar left handed transmission line (LH TL) circuit was investigated theoretically and experimentally. It consists of a capacitive gap and Koch-shaped extended complementary single split ring resonator pair (K-ECSSRRP) etched on the host conductor line and ground plane, respectively. Distinguished from any previous counterparts possessing only one shunt branch, the current K-ECSSRRP features dual-shunt branches in the capacitive–inductive equivalent circuit. As a consequence, an additional attenuation pole is introduced above the upper edge passband of the LH TL, which is a very desirable characteristic. For verification and illustration of potential applications, a compact diplexer is designed and fabricated with an enhanced harmonic suppression. The dual-shunt branch circuit is of reference value and suggests a variety of device implementations where miniaturization and harmonic suppression are major concerns.
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