Three Dimensional (3D) Electromagnetic Field Distributions in the Air and Relative Diversity Gain

HELHEL S., ÖZEN Ş., ALBAYRAK Y., Başyiğit I. B.

PIERS 2014, Guangzhou, China, 25 - 28 August 2014, vol.1, no.1, pp.2178-2181

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Guangzhou
  • Country: China
  • Page Numbers: pp.2178-2181
  • Akdeniz University Affiliated: Yes

Abstract

Polarization discrimination (XPD) or equivalently polarization diversity is commonly
used to improve quality in wireless communication systems such as mobile equipments’
applications, LAN and WLAN applications. MIMO antennas have very big applications in wireless
communications especially for broadening channel capacity. Diversity reception, especially
polarizationdiversity,formobilecommunicationsystemsresultsindecreasingtransmittingpower
as well as in receiving power which allows to control interfering signals. The measurements were
performed at the Antalya Gulf in 1800MHz network. Two routes were selected as to be driven
that they are shore road connecting Antalya City and Kemer City and hill side road patched on
hills. AnavoidingRayleighfadingduringmeasurementsrequireshavingenoughsamplesoverthe
wavelength, and thus a vehicle speed was kept as 30km/h and less. Thus, results have a good
correspondence on slow-moving equipment. A Type-18 isotropic electric ?eld probe compatible
with NARDA SRM3000 is preferred during the measurements.
There exists 3-dimensional (3D) electromagnetic ?eld distribution (EMFD) in the air and its
components can be used for polarization discrimination (XPD) or equivalently diversity improvement.
Measured values of 3 di?erent components of electromagnetic ?eld let us to calculate
cross polarization discrimination values (relative to one another)XPDxy = 20log(Ex
Ey),
XPDxz = 20log(Ex
Ez), andXPDyz = 20log(
Ey
Ez). Measurements were carried out through shore
roads and hillsides. The results show that through the shore side road average XPD value is
about 23dB which extremely high than expected values, and 4.69dB through hillside road is also
important value for solving communication problems. Calculated values point out that 30dB
extra relative gain can be obtained by using suitable 3 dimensional antenna design at shore sides,
while 4.6dB by hill-side roads.