Jong-Kweon Park

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.

Design of the Compact UWB Antenna With PI-shaped Matching Stub

In this paper, we have proposed a compact UWB antenna with PI-shaped (π-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. A prototype antenna printed on the dielectric substrate of FR4 has dimensions of 20 mm by 20 mm. The proposed antenna exhibits a voltage standing wave ratio (VSWR) of less than 2.0, and the figure-of-eight radiation patterns with gain from 2 to 3.5 dBi in a frequency range from 3.1 to 10.6 GHz. 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.

Design of the Tree-Shaped UWB Antenna Using Fractal Concept

In this paper, we have proposed a novel tree-shaped ultra-wideband antenna for UWB applications. We have used the partial ground plane technique and the fractal concept to achieve an ultra-wideband impedance matching. It is found that as the number of iteration increases, the lower-edge of the impedance bandwidth is moved to the low frequency and the level of the impedance matching over the operating frequency band (3.1 ~ 4.8 GHz) is improved. Prototypes of the proposed antennas have been successfully implemented and good radiation characteristics in the operating frequency bands have been achieved. The effect of the angle between upper and lower trapezoids on the return loss was also studied.

Design of Multi-Band Antenna with F-Shaped Slot

In this paper, we have proposed a compact multi-band antenna using F-shaped slot and a matching slot for GSM, PCS, UMTS, WiMAX, and WLAN frequency bands. We have used F-shaped slot and rectangular patch to produce GSM, PCS, UMTS, WiMAX, and WLAN bands. A matching slot is used to achieve a good matching. The obtained radiation patterns are similar to those of a conventional dipole antenna. Details of the proposed antenna design and the simulated and measured results are presented and discussed. The effect of the hand phantom on the matching and radiation pattern is also presented and discussed.

Design of Ultra Wideband Monopole Antenna Using Parasitic Open Loops

We have proposed a novel ultra wideband monopole antenna using parasitic open loops for UWB applications. The proposed antenna consists of a center monopole, two symmetrical open loops, and CPW feeding. The combining technique of orthogonal electric and magnetic dipoles is used to design the proposed antenna. Symmetrical structure is the key concept for achieving an ultra wideband impedance matching and very low dispersion over the operating frequency band (3.1 ∼ 4.8 GHz). The group delay was measured as a function of the azimuth angle φ. The radiation patterns are very close to those of a conventional dipole antenna and the simulated antenna gain varies from 2 dBi to 3.2 dBi over the operating frequency range.

A Simple CPW-Fed UWB Antenna Design

In this paper, we have described a simple CPW-fed UWB antenna for wireless UWB communication. The proposed antenna consists of two symmetrical strips having two steps and CPW feeding. Two techniques(symmetrical structure, two steps) are used to produce good low-dispersion and impedance matching. The proposed UWB antenna has an omni directional radiation pattern, compact size, low dispersion, and low cost.

Design of the Novel DVB-H Antenna for the Folder-Type Mobile Handheld Terminal

We have proposed a novel DVB-H(Digital Video Broadcast for Handheld) antenna for folder-type mobile handheld terminal by using a coupling element, a stub, and an L-type matching circuit. The L-type matching circuit consisting of two chip inductors is used for achieving an improved impedance matching over the DVB-H frequency band (470～702 ㎒). Simulated results showed the stub worked to more knot the lower and upper frequency ends of the input impedance curve. The antenna exhibits a flat gain characteristic from 2 to 2.8 dBi over the DVB-H frequency band. The radiation patterns are a stable Figure-of-eight radiation pattern in the frequency range.

Design of compact chip antenna for UWB applications

This article describes a compact chip antenna for UWB applications. The inclined slot is inserted on the rectangular radiating patch of the UWB chip antenna. From experimental results, the measured impedance bandwidth of the antenna (defined by −6dB return loss) is 2GHz (3–5GHz). Also, the proposed antenna exhibits good radiation patterns with small gain variation (2.5–3.5 dBi) in the operating frequency band. Details of the proposed antenna design and the simulated and measured results are presented and discussed.

Design of the DVB-H Antenna Using Broadband Matching Circuit

We have proposed a novel DVB-H (Digital Video Broadcast for Handheld) antenna for mobile handheld terminal using a U-shaped radiator and a simple matching circuit. The matching circuit consists of two chip capacitors and one chip inductor and is used for achieving an improved impedance matching over the DVB-H frequency band of 470-702 MHz. The proposed antenna was designed, fabricated, and measured. The proposed antenna covers the entire DVB-H band for VSWR < 2.5. The simulated antenna gain varies from 2.1 dBi to 2.8 dBi over the operating frequency range. The obtained radiation patterns are very close to those of a conventional dipole antenna. Details of the proposed antenna design and the simulated and measured results are presented and discussed.