Byoung-Nam Kim

GSM/DCS/IMT-2000 triple-band built-in antenna for wireless terminals

The development of electrically small antennas plays an important role in the rapidly growing mobile communication market. This work presents a novel design technique for a triple-band small internal antenna which covers the GSM/DCS/IMT-2000 bands. The proposed antenna consists of double shorting posts, feed post, and dual-crossed C-slot patch radiators. A high-frequency structure simulator simulation is employed for optimizing the design parameters, and the simulation results agree with the measured data. The IE3D simulation is also used to obtain the current distribution at the resonant frequencies. The maximum gains at the frequencies 950 and 1860 MHz are measured to be about 1.58 and 1.3 dBi, respectively. These positive antenna gains and triple-bands of the proposed antenna are very attractive features for GSM/DCS/IMT-2000 bands handset applications.

Small Antenna With a Coupling Feed and Parasitic Elements for Multiband Mobile Applications

A small antenna with coupling feed and parasitic elements for multiband application is proposed. The proposed antenna is small, low-profile, and suitable for multiband mobile applications. The coupling feed structure provides wideband characteristic to a planar inverted-F antenna (PIFA). There are two resonance modes at 0.8 GHz, and their current distributions are observed. Four resonance modes from high-order resonance modes and parasitic elements are designed to be at 1.7 GHz. The proposed antenna is able to support the GSM850/GSM900/DCS/PCS frequency band in 3:1 VSWR standard. The radiation efficiency and radiation patterns are presented to verify compatibility in mobile handset applications.

Wideband Built-In Antenna With New Crossed C-Shaped Coupling Feed for Future Mobile Phone Application

A wideband built-in antenna with a new crossed C-shaped coupling feed structure for wireless terminals is presented. With the proposed design scheme, a 10-band built-in antenna that covers LTE700/GSM850/GSM900/DCS1800/PCS1900/WCDMA/WiBro2350/Bluetooth/WiMAX2500/LTE2600 is experimentally tested. The antenna could be available for future 4G service and for current 2G/3G services. This novel 10-band built-in handset antenna is developed within the limits of a 50 × 14 × 6 mm3 volume for recent smart phones or personal digital assistant (PDA) applications, thereby achieving good agreement between measurement and simulation.

Hexaband Planar Inverted-F Antenna With Novel Feed Structure for Wireless Terminals

This letter proposes a new wideband built-in antenna with novel feed structure for wireless terminals. With the proposed design scheme, a hexaband antenna for covering global system for mobile communication (GSM850)/GSM900/digital cellular system (DCS1800)/personal communication service (PCS1900)/wideband code division multiple access (WCDMA)/world interoperability for microwave access (WIMAX2350) for use in mobile built-in handsets is experimentally tested. This novel hexaband built-in handset antenna is developed within the limit of a 40 times 20 times 7 mm3 volume. A good agreement between measurement and simulation is achieved

Multi-band coupled feed loop antenna for mobile handset

In this paper, a multi-band coupled feed loop antenna for mobile handset is proposed. This antenna is composed of a feed element and a radiating element. The antenna is printed on the very thin flexible substrate to mount on the dielectric carrier with a volume of 2 cc. The bandwidth of the proposed antenna is 134MHz (866 – 1000 MHz) and 450 MHz (1692 – 2142 MHz). As a result, the proposed antenna covers the three bands of GSM 900, DCS 1800 and PCS 1900 for a 3:1 VSWR. Moreover, the radiation pattern and gain is appropriate for mobile handset. Therefore, this antenna is suitable for small sized multi-band mobile handset applications.

Meander line loop antenna with coupled feed for multiband mobile phone

In this paper, the small loop antenna with coupled feed for multiband mobile phone is proposed. This antenna is composed of a feed monopole, radiating loop and parasitic element. This antenna is printed on the very thin flexible substrate to mount on the dielectric carrier with a volume of 40 mm×10 mm×3 mm. The bandwidth of the proposed antenna is 592 MHz (785–1377 MHz) for low band and 361 MHz (1816–2177 MHz) for high band for a 3:1 VSWR. Thus, the proposed antenna covers the four bands of GSM850 (824–894 MHz), GSM900 (880–960 MHz), PCS (1850–1990 MHz), and UMTS (1920–2170 MHz). Moreover, the measured radiation pattern and gain are appropriate for mobile handset. Therefore, this antenna is suitable for small sized multiband mobile phone applications.

Hepta-band planar inverted-F antenna with novel feed structure for wireless terminals

This paper proposes new design concepts involving the PIFA structure with a folded feeding structure which is implemented between the feed pin and radiators. These structures consist of the U shaped folded feeding technique and parasitic components with enhancing the multiple impedance bandwidth of original PIFA structure. Using this proposed novel feeding structure, a hepta-band built-in PIFA antenna for covering the GSM850, GSM900, DCS, PCS, WCDMA, WIMAX2350, and Bluetooth are eventually implemented.

ANALYTICAL TECHNIQUE TO EVALUATE THE ASYMPTOTIC PART OF THE IMPEDANCE MATRIX OF MICROSTRIP DIPOLE ON A UNIAXIAL SUBSTRATE

The integral transform method with the asymptotic extraction technique is formulated to evaluate a Sommerfeld type integral for the analysis microstrip dipole on a uniaxial substrate. The infinite double integral of the asymptotic part of the impedance matrix with triangular subdomain basis function with edge condition can be reduced to a finite one-dimensional integral. This finite one-dimensional integral can be easily evaluated numerically after the singular part of the integral is treated analytically. It is demonstrated the efficiency and accuracy of the proposed method to evaluate the asymptotic part of impedance matrix.

Multi-band antenna with coupling feed structure for mobile handset applications

Recently, there have been several researches on the design of antennas for small-size mobile hand-set as mobile communication services grow rapidly. Room for an antenna is smaller as the size of a handset is smaller. Moreover, many application systems are integrated in limited volume. An internal antenna for a mobile hand-set should be a very-low profile and operated in multi-band [1]-[3]. In this paper, a multi-band antenna with coupling structure for a mobile handset is proposed. The proposed antenna occupies small volume of 0.85cm3 (=40mm×3mm×7mm) although the antenna operates in tri-band. Dielectric substance which has relative permittivity (εr) of 3 is used to support metal structures. The proposed antenna is easy to be fabricated and suitable for mass production process with low profile and multi-band operation.

A Study on the Small Loop Antenna with a Parasitic Loop Structure for Multiband Mobile Phone Application

In this paper, the small loop antenna with a parasitic loop structure for penta-band mobile phone application is proposed. This antenna is composed of a feed monopole, a radiating loop antenna with a parasitic loop structure and an additional radiating element. The antenna is printed on the very thin flexible substrate to mount on the dielectric carrier with a volume of 40 mm11 mm3 mm. The bandwidth of the proposed antenna is 402 MHz(773~1,175 MHz) for low band and 583 MHz(1,622~2,205 MHz) for high band. As a result, the proposed antenna covers the five bands of GSM850, GSM900, DCS1800, PCS1,900 and WCDMA for a 3:1 VSWR. Moreover, the radiation pattern, gain and efficiency are appropriate for mobile handset. Therefore, this antenna is suitable for small sized multi-band mobile handset applications.