TY - GEN

T1 - Defining the starting distance for the far field of antennas operating in any environment

AU - Abdallah, M. N.

AU - Sarkar, T. K.

AU - Monebhurrun, Vikass

AU - Salazar-Palma, M.

N1 - Publisher Copyright:
© 2016 IEEE.

PY - 2017/1/12

Y1 - 2017/1/12

N2 - The far field of an antenna is generally considered to be the region where the outgoing wavefront is planar and the antenna radiation pattern has a polar variation and is independent of the distance from the antenna. In this paper, the starting distance for the far field is defined for antennas operating in free space and over an imperfect ground plane. First, this paper intends to illustrate that 2D2 / λ formula, where D is the maximum dimension of the antenna and λ is the operating wavelength, is not universally valid, it is only valid for antennas where D >> λ. Second, this paper intends to compute a more specific constraint so instead of D >> λ we compute a threshold for D after which the 2D2 / λ formula applies. Third, this paper intends to properly interpret D in the formula 2D2 / λ when the antenna is operating over an imperfect ground plane. In this paper, we do not use 2D2 / λ for antennas operating over an imperfect ground instead we use a formula which depends on the transmitting and receiving antenna's heights over the air-Earth interface.

AB - The far field of an antenna is generally considered to be the region where the outgoing wavefront is planar and the antenna radiation pattern has a polar variation and is independent of the distance from the antenna. In this paper, the starting distance for the far field is defined for antennas operating in free space and over an imperfect ground plane. First, this paper intends to illustrate that 2D2 / λ formula, where D is the maximum dimension of the antenna and λ is the operating wavelength, is not universally valid, it is only valid for antennas where D >> λ. Second, this paper intends to compute a more specific constraint so instead of D >> λ we compute a threshold for D after which the 2D2 / λ formula applies. Third, this paper intends to properly interpret D in the formula 2D2 / λ when the antenna is operating over an imperfect ground plane. In this paper, we do not use 2D2 / λ for antennas operating over an imperfect ground instead we use a formula which depends on the transmitting and receiving antenna's heights over the air-Earth interface.

KW - Far Field

KW - Near Field

KW - Radial

KW - Transverse

UR - http://www.scopus.com/inward/record.url?scp=85013150629&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85013150629&partnerID=8YFLogxK

U2 - 10.1109/CAMA.2016.7815743

DO - 10.1109/CAMA.2016.7815743

M3 - Conference contribution

AN - SCOPUS:85013150629

T3 - 2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016

BT - 2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016

Y2 - 23 October 2016 through 27 October 2016

ER -