• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.129-132
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• 2000

This paper describes how to Implement dual band GSM hand set varying single band GSM phone. The idea can be extended to Triple mode design. Multiband design is important for global roamming and Baseband setup planning. Here H/W and SW issues are briefly described

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.1
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• pp.97-102
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• 2008

A new internal antenna for GSM/DCS/Bluetooth application is proposed by using a folded loop resonator. Both feed leg and shorting leg are symmetrically implemented at the center of the folded loop, thus leading to produce resonances at integer frequencies of quarter wavelength. An open stub added at one end of the folded loop can reduce resonant frequencies. The open stub play a role in generating PIFA structure at a GSM band, thus increasing bandwidth, Two resonances at the GSM band are observed at folded ring and PIFA, respectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.10
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• pp.1189-1195
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• 2007

We design and fabricate, in this parer, a triple band folded monopole antenna for the folder type mobile phone handset that can be served GSM/DCS/USPCS mobile phone system. Antenna structure is modified meander shape which is obtained both extension of antenna physical length for GSM band and same directional multi-currents flowing on the antenna conductor surface for DCS/USPCS band. This antenna has as good performances as high radiation resistance and gain increment, and would be applied to mobile phone handset that is not able to be performed by internal antenna. By measurement, fabricated antenna by the press process shows under VSWR 3:1 at closed folder state and 2:1 at opened folder state over whole GSM/DCS/USPCS band, and has maximum gain as -0.02 dBi for GSM, +0.2 dBi for DCS, +0.78 dBi for USPCS band with almost omnidirectional H-plane radiation pattern.

• Journal of Communications and Networks
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• v.1 no.3
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• pp.158-165
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• 1999

This paper studies interconnection of DCS1800 and GSM900 dual-band networks. Two types of interconnection config-urations for GSM services, non-overlap and overlap, are described. We propose analytic and simulation models to investigate the ben-efit of the overlap configuration. Our results explain how the radio channel capacities, the inter-system handoff failure rate, the origi-nating call traffic ratio and the offered loads affect the system per-formance. This study indicates that with appropriate overlap con-figuration, the GSM dual-band network can significantly improve the quality of cellular service.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.1
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• pp.61-66
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• 2014

This paper describes the design, fabrication, and measurement of a compact hexa-band coupling antenna for 4G mobile handset using a small element with two slots. In order to obtain sufficient bandwidth (LTE700, GSM850, GSM900, GSM1800, GSM1900, UMTS) with a Voltage Standing Wave Ratio $(VSWR){\leq}3:1$, two slots are inserted in the small element, and coupling patch is used. The measured result of the fabricated antenna provides 410MHz bandwidth form 0.688 to 1.098GHz and 643 MHz bandwidth form 1.607 to 2.250GHz (${\leq}VSWR 3:1$) with the gain ranging from -0.52 to 4.68 dBi. Also, a good radiation pattern is achieved within the hexa-band (0.698-0.960GHz and 1.710-2.170GHz) range.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.5
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• pp.570-582
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• 2012

In the communication, a reconfigurable antenna using two PIN diodes is presented for quad-band(GSM900/GSM1800/GSM1900/UMTS) mobile handset applications. The proposed antenna has a size $45{\times}11{\times}6mm^3$. By independently adjusting the on/off states of two PIN diodes located on the radiating element, the proposed structure can be operated in the PIFA and loop mode, respectively. The PIN diodes are replaced by conducting tape in order to verify the concept. In regards to the fabricated reconfigurable antenna, when operating in the PIFA mode, the measured results show that the 7 dB bandwidth is 8.62 %. which covers the GSM900(880~960 MHz) band. When operating in the loop mode, the measured results show that the 7 dB bandwidth is 26.36 %, which covers the GSM1800(1,710~1,880 MHz), GSM1900(1,850~1,990 MHz), and UMTS(1,920~2,170 MHz) bands, respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.4
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• pp.772-779
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• 2015

In this paper,a reconfigurable multi-band mobile antenna with switching line for LTE band 13, GSM, K-PCS, WCDMA band. The proposed antenna is planar strip line design and composed of stub shorted to the ground plane and two switching line for proposed band operation. To obtain the optimized parameters, we used the simulator, Using the obtained parameters is fabricated. The numerical and experiment results demonstrated that the proposed antenna satisfied the -6 dB impedance bandwidth requirement while simultaneously covering when the state of sw1 and sw2 on for LTE band 13, the state of sw1 off and sw2 on for GSM, K-PCS, the state of sw1 off and sw2 off for WCDMA. Respectively and characteristics of gain and radiation patterns are determined for a reconfigurable multi-band mobile terminal.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.433-436
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• 2008

In this paper, a novel compact broadband dual frequency microstrip antenna is presented. The meander type patch has been designed to have dual resonant frequencies, and the ground with slot was employed to expand the bandwidth in WCDMA band. The simulated results were obtained using HFSS, and the measurement on the proposed antenna was conducted in an anechoic chamber equipped with a network analyzer and a far field measurement system. As a result, measured maximum gain of antenna is 2.07$\sim$2.87 dBi in the GSM band and 3.91$\sim$5.61 dBi in the WCDMA band.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.11
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• pp.1194-1200
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• 2009

An internal antenna which has 1 cc volume was implemented on the FPCB(Flexible Printed Circuit Board) for the mobile phone. We increased antenna gain and efficiency by the applying of current direction concept on the antenna pattern for this small antenna. Short antenna length for the GSM band was compensated by the spiral inductor on the FPCB. For broadening bandwidth on GSM band, it's applied 2 spiral inductors. A conductor pattern for the DCS band was positioned perpendicular with the FPCB. Antenna was implemented on FPCB that is dielectric constant 4.4 and thickness 0.05 mm, and FPCB was attached on a carrier dimensioned $L{\times}W{\times}H=30{\times}7{\times}5\;mm$. Measurements showed that max. VSWR 2:1, efficiency 42.49~60.95 % and 47.95~73.21 %, average gain -3.72~-2.15 dBi and -3.19~-1.35 dBi on the GSM and DCS band, respectively. These results are good performances among the small antenna. And the radiation patterns are omnidirectional on the H-plane to both band.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.9
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• pp.1030-1038
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• 2007

This paper presents the measurement results of strength of electromagnetic wave for GSM-900/GSM-1800 band which is used in Europe. The Giryong village and Sosan field are selected as candidate regions according to the measurement results in Gijang-gun, Busan. The vertical polarizations is about 12 dBm higher than horizontal polarization at two candidate places, and it is measured 25 dBm lower than urban. The maximum value of measured strength of vertical polarizations in the cellular/GSM-900 bands are -65 dBm at Giryong village and -69 dBm at Sosan field, respectively. The maximum value of measured results of PCS/GSM-1800 bands are -90.5 dBm at Giryong village and -85 dBm at Sosan field, respectively, We confirm that the receiving strength of electromagnetic wave are very weak below -65 dBm at two candidate places and the signals of GSM frequency bands not affect to conversional system, then it is considered as a suitable place for GSM mobile field test.