scispace - formally typeset
Search or ask a question
Author

Hyeong-Sik Yoon

Bio: Hyeong-Sik Yoon is an academic researcher from Information and Communications University. The author has contributed to research in topics: Folded inverted conformal antenna & Antenna tuner. The author has an hindex of 2, co-authored 2 publications receiving 12 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a planar inverted F-antenna was proposed for DCS/PCS/IMT-2000/UMTS/ISM/WLAN applications, with a small size of 19 times 10 times 5 mm3.
Abstract: This letter presents a novel compact internal antenna of the planar inverted F-antenna type. The proposed antenna, with the small size of 19 times 10 times5 mm3 , can be easily placed in practical handsets. The return loss and radiation patterns from the proposed antenna are presented. The measured bandwidth of the proposed antenna (S11 < -9 dB) can cover 610 MHz (1600-2210 MHz) in the lower band and 1170 MHz (4960-6130 MHz) in the upper band. These operating frequencies are very attractive features for DCS/PCS/IMT-2000/UMTS/ISM/WLAN bands handset applications. Numerical simulation and experiment results of the proposed antenna are investigated.

9 citations

Journal ArticleDOI
TL;DR: In this paper, a pattern/polarization diversity array for multiple input multiple output (MIMO) applications was proposed by applying vertical and horizontal excitation, and the correlation factors with respect to the pattern and polarization diversity were investigated.
Abstract: This article proposes the pattern/polarization diversity array for multiple input multiple output applications by applying vertical and horizontal excitation. We show that pattern and polarization of antenna are changed due to vertical feeding. Then, we attempt to realize the two antenna diversity array by using different feeding method. As a result, the correlation factors with respect to the pattern and polarization diversity are investigated. Finally, the analysis of the diversity system in the view point of capacity is presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 561–566, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23142

3 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this article, a planar inverted-F antenna (PIFA) for personal communication handset applications is presented, which operates at following frequency bands: DCS, PCS, UMTS, WiBro, WiMax and/or WiBro phase 3, and WLAN.
Abstract: This letter presents a compact tunable internal planar inverted-F antenna (PIFA) for personal communication handset applications. The antenna operates at following frequency bands: DCS, PCS, UMTS, WiBro, WiMax and/or WiBro phase 3, and WLAN. A single varactor diode is attached to the antenna in a proper location between the main patch and supplemental patch in order to get tuning over the wide frequency range around 2 GHz. The antenna was designed and optimized by using CST microwave studio program. Measured return losses (S11) and radiation patterns of the antenna were carried on Anritsu 37377C Vector Network Analyzer and in standard anechoic chamber room. The surface current distributions, the co-polarization and cross-polarization patterns of the antenna are given to demonstrate the antenna's performance.

29 citations

Proceedings ArticleDOI
11 Dec 2009
TL;DR: A state-of-the art review of the best solutions developed all around the world for multiple antenna-systems for portable UMTS devices and the neutralization technique dedicated to enhance the total efficiency of several radiators integrated within the same (small) ground plane is described.
Abstract: In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we perform a state-of-the art review of the best solutions developed all around the world. Then, we present all the UMTS multi-antenna systems designed at the LEAT of the University of Nice-Sophia Antipolis since 2004. We especially describe the neutralization technique dedicated to enhance the total efficiency of several radiators integrated within the same (small) ground plane. Lastly we try to identify promising solutions and future trends in this area.

24 citations

Journal ArticleDOI
TL;DR: In this article, a monopole type penta-band internal antenna using a parasitic element is proposed, with the small size of 37 × 8 × 35 mm3, which can provide sufficient bandwidth to cover the GSM(850/900), DCS, PCS, and WCDMA bands.
Abstract: This letter presents a monopole type penta-band internal antenna using a parasitic element The proposed antenna, with the small size of 37 × 8 × 35 mm3 can provide sufficient bandwidth to cover the GSM(850/900), DCS, PCS, and WCDMA bands The measured impedance bandwidth (VSWR ≤ 3) of the proposed antenna can cover 250 MHz in the lower frequency band and 1082 MHz in the upper frequency band Ansoft HFSS (High Frequency Structure Simulator) is employed to analyze the proposed antenna in the design process and to compare it with the experimental results The measured peak gains of the proposed antenna range from 121 to 248 dBi for the GSM(850/900), DCS, PCS, and WCDMA bands © 2008 Wiley Periodicals, Inc Microwave Opt Technol Lett 50: 3045–3048, 2008; Published online in Wiley InterScience (wwwintersciencewileycom) DOI 101002/mop23884

11 citations

Journal ArticleDOI
TL;DR: In this article, a low profile internal planar monopole (PM) antenna is proposed, which consists of a rectangular PM, 10 × 20 mm2, loaded with a pair of parallel small thin plates placed on the two radiating sides of the PM antenna.
Abstract: A novel low profile wideband internal planar monopole (PM) antenna is proposed. It consists of a rectangular planar monopole, 10 × 20 mm2, loaded with a pair of parallel small thin plates, 8 × 12 mm2, placed on the two radiating sides of the PM antenna. The proposed antenna has two ground planes. A small horizontal ground, 9 × 20 mm2, that holds the PM antenna (making the overall volume of the antenna element 9 × 20 × 23 mm3) and the vertical ground, 50 × 80 mm2 that can be treated as the ground plane of the circuit board of a mobile phone. A prototype of the proposed antenna has been fabricated and tested. Its operating bandwidth with S 11 lower than −10 dB is 1.66–7.35 GHz, which covers the digital communication system (DCS 1.72–1.88 GHz), personal communication system (PCS 1.85–1.99 GHz), universal mobile telecommunication system (UMTS 1.92–2.17 GHz), wireless local area network (WLAN), which usually operate in the 2.4 GHz (2.4–2.484 GHz) and 5.2/5.8 GHz (5.15–5.35 GHz/5.725–5.825 GHz) and worldwide in...

7 citations

Proceedings ArticleDOI
26 Mar 2012
TL;DR: In this paper, the authors present an investigation on the currents running through the source, the short and the capacitor of a tunable Planar Inverted F antenna (PIFA) for hand-held devices.
Abstract: Tunable antennas are a promising way to overcome bandwidth limitations for the new communication standards. Nevertheless they become very lossy at low frequencies. This paper presents an investigation on the currents running through the source, the short and the capacitor of a tunable Planar Inverted F Antenna (PIFA) for hand-held devices. Simulations suggest that the losses due to the currents running through the external tuning component depend on its location and value. Therefore it should be placed the furthest away from the location of the source and the short in a PIFA design and have small capacitances.

7 citations