Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Jeong Keun Ji"'
Autor:
Jeong Keun Ji
Publikováno v:
ICT Express, Vol 3, Iss 2, Pp 81-84 (2017)
In this study, a compact multiband antenna employing a wideband dual zeroth-order resonator (ZOR) is proposed for mobile handset applications. The theory of wideband zeroth-order mode and multimode is used to design the proposed antenna covering LTE8
Externí odkaz:
https://doaj.org/article/c523e9ff5504455a9a9d640a80949c22
Autor:
Jeong Keun Ji
Publikováno v:
ICT Express, Vol 2, Iss 4, Pp 199-203 (2016)
In this study, a dual-band pattern reconfigurable antenna is proposed for 2.4 and 5.8 GHz wireless multiple-input multiple-output (MIMO) applications. The proposed antenna comprises four pairs of active elements and parasitic elements loaded on PIN d
Externí odkaz:
https://doaj.org/article/909fa90c08f2476997709728a8f01da7
Autor:
Jeong Keun Ji
Publikováno v:
International Journal of Antennas and Propagation, Vol 2017 (2017)
A compact broadband dual zeroth-order resonator (ZOR) antenna is proposed for multiband smart mobile phone applications. The theory of broadband zeroth-order mode and multimode technique is used to design the proposed antenna covering GSM850 (824–8
Externí odkaz:
https://doaj.org/article/f598f875ec2743daba74ffbaf057dacc
Autor:
Jeong Keun Ji
Publikováno v:
Microwave and Optical Technology Letters. 58:2755-2760
Autor:
Jeong Keun Ji, Min Gyu Cho
Publikováno v:
IEEE Magnetics Letters. 7:1-5
A low-loss Co $_2$ Y hexagonal ferrite (Ba $_2$ Co $_{1.9}$ Zn $_{0.1}$ Fe $_{12}$ O $_{22}$ ) has been developed for miniaturization and performance improvement of wireless multiple-input multiple-output (MIMO) antennas. The ferrite material has per
Publikováno v:
Microwave and Optical Technology Letters. 53:2314-2317
An internal MIMO antenna for mobile applications is proposed. Helical-type antenna elements are used to construct the MIMO system. The resonance frequencies of the MIMO antenna are controlled by the number of turns per helix. A multi suspended line w
Publikováno v:
Microwave and Optical Technology Letters. 53:87-90
A method to extend the bandwidth of epsilon negative (ENG) zeroth-order resonator (ZOR) antennas using a Co2Y hexagonal ferrite (Ba2Co1Zn0.7Cu0.3Fe12O22) is presented.It is accomplished by using the ferrite helical loading for shunt inductance of ENG
Publikováno v:
Microwave and Optical Technology Letters. 52:1298-1301
A compact quad-band antenna using zeroth-order resonator (ZOR) for GSM850, DCS1800, PCS1900, and UMTS operations are presented. The proposed antenna comprises a lower band ZOR portion and an upper band ZOR portion. The zeroth-order resonant propertie
Publikováno v:
The Journal of Korean Institute of Electromagnetic Engineering and Science. 21:194-201
We propose a frequency selective surface(FSS) using double split ring resonators(DSRRs) for isolation enhancement between CDMA and RFID. The structure consists of an outer SRR and an inner SRR, and the gaps are formed in the same direction. By proper
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 9:36-39
A method to extend the bandwidth of metamaterial (MTM) antennas using a composite right/left-handed transmission line (CRLH-TL) is presented. The resonance modes and wideband characteristics of MTM antennas are analyzed and described using dispersion