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Investigation of transformer turns ratio between feed and slot of aperture coupled slot antenna by using s11 parameter.

Liu, Lei; Ghassemlooy, Zabih; Sambell, Alistair; Danaher, Sean; Smith, David

Authors

Lei Liu

Zabih Ghassemlooy

Alistair Sambell

Sean Danaher

David Smith



Abstract

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.

Citation

Liu, L., Ghassemlooy, Z., Sambell, A., Danaher, S., & Smith, D. (2013). Investigation of transformer turns ratio between feed and slot of aperture coupled slot antenna by using s11 parameter. IEEE Transactions on Antennas and Propagation, 61, 5785-5787. https://doi.org/10.1109/TAP.2013.2275745

Journal Article Type Article
Publication Date 2013
Deposit Date Apr 10, 2014
Print ISSN 0018-926X
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 61
Pages 5785-5787
DOI https://doi.org/10.1109/TAP.2013.2275745
Keywords Aperture coupled slot antenna; scattering parameter $S_{11}$ ; slot lines; transformer turns ratios;
Public URL http://researchrepository.napier.ac.uk/id/eprint/6763
Publisher URL http://dx.doi.org/10.1109/TAP.2013.2275745