Yeongseog Lim

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In this paper, the design and the fabrication of dual bandpass filter with controllable bandwidth is presented. Two resonators are designed to have different fundamental resonant frequencies, one for the lower passband and the other for the upper passband. A lossless transmission line model is used to determine the resonance properties of the resonator and(More)
In this paper, we proposed the dual polarization antenna for DCS, UMTS, and WiBro bands. To extend the impedance band width, the proposed antenna used the square loop radiators. In addition, by square loop radiators, the dimensions of an antenna are reduced. As a result of measurement after compensation, we can see that the first port is less than(More)
Determining resonant frequency was proposed for the bandpass filter using single dual-mode resonator. Because a coupling coefficient implied the information which is the position of poles for the bandpass filter, the resonant frequencies (&#x0192;<inf>e</inf>, &#x0192;<inf>m</inf>) were obtained through the equivalent circuit analysis and the simple(More)
An effective and simple planar dipole antenna has been proposed with a balun transition and the balanced array dipole element. This design methodology is not only simple to implement but also low profile and provides 1.84&#x223C;2.44 GHz bandwidth with fairly good radiation patterns. Unbalanced currents are compensated for balun transition which provide the(More)
In this paper, we proposed the Balun-BPF(band pass filter) using the magnetically coupled resonators. The proposed Balun-BPF is a deformation of the transformer which operates like the ideal Balun in low frequency. The conventional coupled-resonator filter design theory was used for the design of a Balun-BPF. Moreover, the Interdigital-loop resonator was(More)
The work presents an improved coaxial line fed ring-slot antenna system for microwave coagulation therapy. The performance of a hyperthermia applicator is characterized by both impedance matching and specific absorption rate (SAR) distribution in the tissue of interest. First, we analyze the antenna of a conventional applicator and modify the configuration(More)
A compact printed dual dipole structure with CPW-fed for WLAN operations is proposed in this paper. The proposed antenna, which consists of dual dipole strips, has modified monopole and modified strips by the ground plane. The proposed antenna has been obtained good radiation characteristics. This antenna is effectively covered 5 GHz (5.15&#x2013;5.825 GHz)(More)
A novel compact dual-mode resonator is proposed. This proposed dual-mode resonator was composed of the following features: the series capacitance is inserted for miniaturization and it's effect was also analyzed, and open stub was applied on symmetric plan for dual-mode behavior. Using this dual-mode resonator, dual-band bandpass filter of 0.2(More)