Woo-Young Park

Small antenna using 2-D interdigital composite right/left-handed (CRLH) transmission lines

In this paper, we propose a small antenna based on composite right/left-handed (CRLH) transmission lines. Interdigital capacitors are used to enhance series capacitances and it is built in a single layer, so that it lowers a resonant frequency while keeping a physical same size. It is observed that the resonant frequencies are 3.028 GHz and 2.724 GHz, corresponding to n=-1 and -2 modes, respectively. Therefore, the proposed structure enables the antenna size more compact and simplifies a fabrication.

Multi-Beam Leaky-Wave Antenna: Design, Analysis, and Experiments

Abstract In this article, a novel multi-beam leaky-wave antenna composed of a dual-composite right-/left-handed meta-surface, including the defected ground structure contribution, is presented. The multi-mode operation of the antenna provides two different types of beams. The first, which is radiated from the meta-surface at the fundamental mode, is capable of continuous scanning from backward to forward angles. The second, which is radiated from the defected ground structure at the higher-order mode, is fixed at 59°. Operating principles are explained theoretically and experimentally. The measured radiation patterns demonstrate that the proposed antenna has two discrete scanning angles.

Miniaturized Half-Mode Substrate Integrated Waveguide Bandpass Filter Loaded with Double-Sided Complementary Split-Ring Resonators

Abstract A novel technique of miniaturizing for a half-mode substrate integrated waveguide bandpass filter by using a double-sided complementary split-ring resonator is presented in this article. With the proposed technique, a double-sided complementary split-ring resonator half-mode substrate integrated waveguide filter provides lower resonance frequency compared to its conventional counterpart because of the coupling effect between the complementary split-ring resonators of the top and bottom plates. The property of the double-sided complementary split-ring resonator is modeled by an LC resonance circuit. The frequency response of the double-sided complementary split-ring resonator shows bandpass characteristics. By applying the classical filter design methodology, the proposed filter was designed for desired filter specifications. Both circuit and full-wave simulated frequency responses have been attributed to the theory of the proposed technique, and good agreement was achieved with experiment results.

Millimeter-wave filter using novel micromachined substrate integrated waveguide structure with embedded silicon vias in BCB dilectrics

This paper reports a millimeter-wave bandpass filter (BPF) based on a novel micromachined substrate integrated waveguide (SIW) structure with square complementary split-ring resonators (CSRRs). Four CSRRs are introduced to the SIW as an element providing passband characteristics below a cutoff frequency of the waveguide required for BPF. Unlike usual SIW-BPFs, the proposed BPF can be integrated with silicon-based circuits or RF MEMS devices by micromachining batch process due to its silicon process compatibility. In order to change the propagation mode from TEM to TE10, triangular slots are utilized as a CPW to waveguide transition. The fabricated BPF shows a high selectivity with a minimum insertion loss of 2.27 dB at 14 GHz and a 3-dB bandwidth of 9.3 %. These measured results are in good agreement with the simulation results.