Jung N. Lee

An Ultra-Wideband Antenna Design Using Sierpinski Sieve Fractal

A trapezoid ultra-wideband antenna using Sierpinski sieve fractal was proposed to reduce the size and expand the bandwidth of the antenna. The effect of the fractal iteration factor (Kn) on the return loss of the antenna was simulated. The return loss, group delay, and path loss (|S 21|) of the antenna were simulated and measured to show that the proposed antenna may be used well for UWB applications with the wide operating bandwidth and good impedance matching. The radiation characteristics of dipole-like pattern and gain variation (2–4 dBi) were obtained over the frequency band.

A novel UWB antenna using PI-shaped matching stub for UWB applications

In this paper, we have proposed a compact UWB antenna with PI-shaped (pi-shaped) matching stub for UWB applications. The antenna has a modified trapezoidal radiating patch, a PI-shaped matching stub, CPW feeding, and two steps for impedance matching. To evaluate the dispersion performance of the designed UWB antenna, the path loss (|S21|) and the group delay are simulated and measured. Details of the proposed antenna design and the simulated and measured results are presented and discussed.

The Design of UWB Bandpass Filter-Combined Ultra-Wide Band Antenna

We have proposed a compact filter-combined ultra-wide band antenna for the use of DS-UWB low band or MB-OFDM lower three bands (3.1-5.2 GHz). The designed antenna has a microstrip-fed trapezoidal radiating patch, UWB band pass filter using the dumbbell-shaped DGS (defected ground structure) and IDC (interdigital capacitor), two steps for impedance matching, and microstrip feeding. Three kinds of prototypes (trapezoidal UWB antenna, UWB band pass filter, and the compact filter-combined ultra wideband antenna) are fabricated and measured. The designed antenna has the figure-of-eight radiation pattern, wide bandwidth, and negligible dispersion over the operating frequency band. Details of the proposed antenna design and the simulated and measured results are presented and discussed.

Triple-band antenna with slots for PCS/WLAN/UWB applications

In this paper, we have proposed a triple-band antenna with L and T-shaped stubs for PCS/WLAN/UWB applications. The proposed antenna consists of two symmetrical strips, multi-steps, and L and T-shaped stubs. Two techniques are used to produce the two resonances at each frequency bands, the low dispersion, and good impedance matching. The proposed antenna has an omni-directional radiation pattern, compact size, low dispersion, and low cost.