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Capacitive coupling of discrete micro-sized gaps for RF applications

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journal contribution
posted on 2013-01-22, 09:16 authored by William WhittowWilliam Whittow
This paper investigates the performance of a passive thin metallic object containing micro-sized gaps exposed to a plane wave excitation. This work has potential applications for emerging antenna fabrication techniques where the conducting sections are made from discrete metallic sections. This includes antennas composed from nanomaterials and conventional inkjet printed antennas. Electromagnetic simulations showed metallic sections separated by a micro-sized gap were found to capacitively couple. The coupling can be enhanced by reducing the size of the gap, increasing the width of the metallic object or by filling the gap with a permittivity greater than unity. It should be noted that the DC value of parallel plate capacitor is not strictly valid at radiofrequencies – however, this paper shows that the DC value of capacitance is a reasonable approximation and is useful to understand the behavior.



  • Mechanical, Electrical and Manufacturing Engineering


WHITTOW, W.G., 2012. Capacitive coupling of discrete micro-sized gaps for RF applications. IET Microwaves, Antennas & Propagation, 6 (13), pp.1481-1486.


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This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves, Antennas & Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.




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