This work explores the optimal mesh structure, stitch density and production technique of stitched ground plane for microstrip patch antenna. Meshed ground plane was used as a generic problem. A stitched ground plane is pro-posed and designed using Matlab interface to computer embroidery. Using the meshed or stitched ground plane as a case study, the resistance between meshes was analysed and measured. The equivalent resistance between nodes is a function of their distance apart. A finite resistive grid was simulated and compared to measured sets of data. A microstrip patch antenna with stitched ground shows comparable performance to the conventional etched ground of the size in terms of bandwidth. The stitched ground plane has a higher band-width than the etched copper ground plane because of the increased thickness of the substrate. Thus, it can be concluded that the use of the interface method shows the possibilities of controlling the stitch density and distances between mesh nodes. The interface increases the stitching density and reduces the elec-trical resistance between mesh nodes making the antennas flexible and weara-ble. The functionality of these antenna samples has been tested and validated using microstrip patch ground at 2.45 GHz and 5 GHz. Measurement results on the proposed stitched ground planes were compared with the theory of infinite resistive network that shows good agreement.
References
[1]
Zhang, S., Whittow, W., Seager, R., Chauraya, A. and Vardaxoglou, J.C. (2017) Non-Uniform Mesh for Embroidered Microstrip Antennas. IET Microwaves, Antennas & Propagation, 11, 1086-1091. https://doi.org/10.1049/iet-map.2016.0901
[2]
Zhang, S., Chauraya, A. and Whittow, W.G. (2014) Embroidered Wearable Antennas Using Conductive Threads with Different Stitch Spacings. 2012 Loughborough Antennas & Propagation Conference (LAPC), Loughborough, UK, 12-13 November 2012, 1-4. https://doi.org/10.1109/LAPC.2012.6403059
[3]
Chauraya, A., Whittow, W.G., Vardaxoglou, J.C., Yi, L., Torah, R., Yang, K., Beeby, S. and Tudor, J. (2013) Inkjet Printed Dipole Antennas on Textiles for Wearable Communications. IET Microwaves, Antennas & Propagation, 7, 760-767. https://doi.org/10.1049/iet-map.2013.0076
[4]
Gil, I., Fernández-García, R. and Tornero, J.A. (2019) Embroidery Manufacturing Techniques for Textile Dipole Antenna Applied to Wireless Body Area Network. Textile Research Journal, 89, 1573-1581. https://doi.org/10.1177/0040517518770682
[5]
Chedid, M., Belov, I. and Leisner, P. (2007) Experimental Analysis and Modelling of Textile Transmission Line for Wearable Applications. International Journal of Clothing Science and Technology, 19, 59-71. https://doi.org/10.1108/09556220710717053
[6]
Ferreira, D., Pires, P., Rodrigues, R. and Caldeirinha, R.F. (2017) Wearable Textile Antennas: Examining the Effect of Bending on Their Performance. IEEE Antennas and Propagation Magazine, 59, 54-59. https://doi.org/10.1109/MAP.2017.2686093
[7]
Vallozzi, L., Vandendriessche,W., Rogier,H., Hertleer, C. and Scarpello, M.L. (2010) Wearable Textile GPS Antenna for Integration in Protective Garments. Proceedings of the Fourth European Conference on Antennas and Propagation, Barcelona, Spain, 12-16 April 2010, 1-4.
[8]
Corchia, L., Monti, G. and Tarricone, L. (2018) Durability of Wearable Antennas Based on Nonwoven Conductive Fabrics: Experimental Study on Resistance to Washing and Ironing. International Journal of Antennas and Propagation, 2018, Article ID: 2340293. https://doi.org/10.1155/2018/2340293
[9]
Kiourti, A. and Volakis, J.L. (2015) Colorful Textile Antennas Integrated into Embroidered Logos. Journal of Sensor and Actuator Networks, 4, 371-377. https://doi.org/10.3390/jsan4040371
[10]
Clasen, G. and Langley, R. (2004) Meshed Patch Antennas. IEEE Transactions on Antennas and Propagation, 52, 1412-1416. https://doi.org/10.1109/TAP.2004.830251
[11]
Turpin, T.W. and Baktur, R. (2009) Meshed Patch Antennas Integrated on Solar Cells. IEEE Antennas and Wireless Propagation Letters, 8, 693-696. https://doi.org/10.1109/LAWP.2009.2025522
[12]
Krupka, J., Geyer, R.G., Baker-Jarvis, J. and Ceremuga, J. (1996) Measure Ments of the Complex Permittivity of Microwave Circuit Board Substrates Using Split Dielectric Resonator and Reentrant Cavity Techniques. Seventh International Conference on Dielectric Materials, Measurements and Applications, Bath, UK, 23-26 September 1996, 21-24. https://doi.org/10.1049/cp:19960982
[13]
Balanis, C.A. (2016) Antenna Theory Analysis and Design. John Willey and Son’s Inc, Hoboken.
[14]
Pozar, D.M. (1992) Microstrip Antennas. Proceedings of the IEEE, 80, 79-91. https://doi.org/10.1109/5.119568
[15]
Wiri, A.T. (2019) Automated Design, Optimization and Simulation of Stitched Antennas for Textile Devices. Ph.D. Dissertation, Loughborough University, Loughborough, UK.
[16]
Wu, F.Y. (2009) Theory of Resistor Networks: The Two-Point Resistance. Exactly Solved Model. Journal of Physics A: Mathematical and General, 37, Article No. 26. http://stacks.iop.org/ja/37/6653 https://doi.org/10.1088/0305-4470/37/26/004
[17]
Venezian, G. (1994) On the Resistance between Two Points on a Grid. American Journal of Physics, 62, 1000. https://doi.org/10.1119/1.17696
