LTE-R 철도 통합무선망용 안테나 최적설계에 관한 연구

Abstract

Recently, wireless communications have comprehended into people’s lives all over the world. Long Term Evolution(LTE) is being deployed worldwide, aiming to support a data rate of up to 300Mbps with a bandwidth of 20MHz. Moreover, the fourth generation mobile communication system, i.e., LTE-Advanced, which will achieve a peak data rate of 1Gbps using a bandwidth of 100MHz, is now being standardized internationally. With the developing of the high speed railway, the train speed can reach up to 350 km/h, so technical requirements for high speed railway mobile communication system. Long Term Evolution for Railway(LTE-R) is commonly considered as a promising candidate which can provide users with higher data rate and lower latency. In recent years, to fulfill the increasing requirements for novel broadband mobile communication systems of High Speed Railway(HSR). LTE-R has been presented based on the standard of LTE. These wireless communication system generally require microwave and antennas. Dipoles printed on an electrically thin dielectric substrate are commonly used as radiating elements in base station antennas as they are low weight, easy to fabricate, and they also offer relatively wide bandwidths and high polarization property. Microstrip-fed antennas for wireless communications have been interested by many authors for wideband operations. A single antenna is highly desirable if it can operate a wideband. The antenna should be in planar form, lightweight and compact, so that it can easily be embedded in the cover of communication devices. In addition, a simplified feeding circuit is also an important component, because it can reduce the transmission line length and the radiation losses. The proposed printed dual dipole antenna is used width of the microstrip line. The influence of various parameters on antenna characteristics is discussed. The proposed antenna ca easily be excited by a 50[Ω] microstrip line and a pair of parallel metal strips between modified ground strips and modified microstrip feed line; good impedance matching can be obtained at 2.3 ~2.5 GHz and 5.1 ~ 5.2 GHz. This paper presents a evaluation of the microstrip-fed antenna for a LTE-R dimension suitable for the high speed railway condition. The results show that the antenna for a LTE-R has promising potential to be used in a high speed railway environment.