TY - JOUR
T1 - Investigation of transformer turns ratio between feed and slot of aperture coupled slot antenna by using S11 parameter
AU - Liu, Lei
AU - Ghassemlooy, Zabih
AU - Sambell, Alistair
AU - Danaher, Sean
AU - Smith, David
PY - 2013/11/1
Y1 - 2013/11/1
N2 - This communication presents a simplified design approach to obtain the turns ratio Nf which models the coupling between the microstrip feed and slot line of an aperture coupled slot antenna by using the S11 parameter. Equations are derived using S11 parameter to determine Nf and simulations are carried out at 2 GHz using substrates of PCB FR4, Duroid 5870, and Duroid 6010. Results indicate Nf is proportional to the slot length from 0 to 20 mm increasing rapidly with length. Over 20 mm slot length, the trend reduces and the value of Nf tends towards 1. In addition, Nf varies with the height of substrate but is little affected by dielectric constant of substrate which could therefore be ignored to simplify the design procedure. Measured results show good agreement with the theoretical model.
AB - This communication presents a simplified design approach to obtain the turns ratio Nf which models the coupling between the microstrip feed and slot line of an aperture coupled slot antenna by using the S11 parameter. Equations are derived using S11 parameter to determine Nf and simulations are carried out at 2 GHz using substrates of PCB FR4, Duroid 5870, and Duroid 6010. Results indicate Nf is proportional to the slot length from 0 to 20 mm increasing rapidly with length. Over 20 mm slot length, the trend reduces and the value of Nf tends towards 1. In addition, Nf varies with the height of substrate but is little affected by dielectric constant of substrate which could therefore be ignored to simplify the design procedure. Measured results show good agreement with the theoretical model.
KW - Aperture coupled slot antenna
KW - slot lines
KW - transformer turns ratios
KW - scattering parameter S11
UR - http://www.scopus.com/inward/record.url?scp=84887854917&partnerID=8YFLogxK
U2 - 10.1109/TAP.2013.2275745
DO - 10.1109/TAP.2013.2275745
M3 - Article
AN - SCOPUS:84887854917
VL - 61
SP - 5785
EP - 5787
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 11
M1 - 6571246
ER -