Byungwoon Jung

Balanced RFID Tag Antenna Mountable on Metallic Plates

A novel balanced tag antenna for a radio frequency identification (RFID) system is presented. The radiating elements of two planar inverted-F antennas (PIFAs) are inductively coupled by the feed loop with out of phase. The balanced structure provides smaller degradation of performances when an RFID tag is mounted on various sizes of metal plates. The HFSS simulator is employed to analyze the proposed antenna in the design process and to compare with measured results

Cavity-backed slot antenna array for the repeater system of a satellite digital multimedia broadcasting service

For the repeater system of the satellite digital multimedia broadcasting (DMB) service (2630/spl sim/2655 MHz) requiring a high-gain antenna and enough isolation between antennas, a cavity-backed slot antenna array (CBSAA) fed by a single waveguide is proposed to suppress side lobe level (SLL) and to increase front-to-back ratio (FBR). The SLL and FBR are enhanced with an optimized magnitude ratio of the electric field at each slot and an additional vertical reflector. The measured SLLs in the H- and E-planes are under -33.24 and -35.78 dB, respectively. An FBR over 37.84 dB and a peak gain over 17 dBi are measured. The proposed CBSAA consists of 2 /spl times/ 4 slot elements backed by a single cavity and has the characteristics of high power handling capability, high radiation efficiency, low feed line loss, and simple feed network.

Design of a multi-band internal antenna using an open stub

An internal antenna for GSM (880/spl sim/920MHz), DCS (1710/spl sim/1880MHz), and US-PCS (1850/spl sim/1990MHz) mobile handset is proposed. The antenna is designed to have a multi-band operation and includes feed line, patch and matching stub. It has a single radiating element and operates in multi-band by a matching circuit. The measured peak gain is 0.11dBi, 1.65dBi and 0.13dBi for GSM, DCS, and US-PCS, respectively.

Triple band internal antenna using matching circuits

In this paper, a triple-band internal antenna for mobile handsets is present. Dual band operation is generated by using a band reject filter as a matching circuit and without any transformations on its radiator. Moreover, the antenna gives a wide impedance bandwidth in high band by using an additional chip capacitor so that the antenna can operate in triple-band with only one radiator. Details of the proposed antenna are presented.

Triple band internal antenna with a novel feeding structure

An internal antenna using a novel feeding structure is proposed for multi-band mobile handsets. The proposed antenna has the balanced feeding line realized by using a short circuit and is excited by electromagnetic coupling. The proposed technique makes antenna size considerably small and gives a good current distribution on the ground plane. Therefore, antenna development with the features of good radiation efficiency, broad bandwidth, and less interference with a human head/body is relatively easy.

A Sutdy on the UWB Intenna with Band-Stop Function for Mobile Handsets

In this paper, small UWB antenna with band-stop function for mobile handsets is proposed. A gap between radiator and under and side ground is adjusted for small size and broadband. A radiator is folded to the back side of PCB for miniaturization and tapered feeding structure is used to enhance matching characteristic. A antenna clearance has a size of and a size of radiator is . It covers all UWB band from 3.15 GHz to 4.75 GHz and from 7.2 GHz to 10.2 GHz for VSWR

Design of Dual Half Wavelength Loaded Line Antenna for Multiband Mobile Handsets

In this paper, a frequency changeable antenna using dual half wavelength loaded line structure is proposed for multiband mobile handset applications. The proposed antenna has a capability of independent frequency shift by controlling two added inductance values in two different bands. Experimental results indicate that the proposed antenna provides enough effective bandwidth to cover , , , and bands and peak gain variation is only 0.54 dB.