Development of compact directional antenna utilising plane of symmetry for wideband brain stroke detection systems. Issue 12 (1st June 2014)

• Record Type: Journal Article
• Authors: Mobashsher, A.T.; Abbosh, A.
• Is Part Of: Electronics letters. Volume 50:Issue 12(2014)
• Page Start: 850
• Page End: 851
• Publication Date: 2014-06-01
• Subjects: directive antennas -- brain -- broadband antennas -- antenna radiation patterns -- medical image processing -- near‐field communication; compact directional antenna -- wideband brain stroke detection systems -- microwave based brain stroke detection -- wideband antennas -- portable systems -- image theory -- magnetic symmetry plane -- folded antenna -- electromagnetic image theory -- radiation directivity -- penetration capability -- fractional bandwidth -- near‐field radiations -- far‐field radiations -- radiation safety; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.0616
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Microwave‐based brain stroke detection demands low profile, compact, directive and wideband antennas for efficient imaging using portable systems. Using image theory of electromagnetics, the magnetic symmetry plane of a folded antenna is utilised for its miniaturisation to half of its original volume without sacrificing its penetration capability or radiation directivity. The antenna achieves 63% fractional bandwidth (1.25–2.4 GHz) with 3.5 dBi average gain along the direction of radiation. Both the near‐field and far‐field radiations are characterised to ensure the antenna's applicability in the detection system. Moreover, the radiation safety is also analysed since the antenna has to operate in close proximity to the head. The overall dimensions of the proposed antenna are 0.29 λ 0 × 0.12 λ 0 × 0.06 λ 0 ( λ 0 = lowest operating wavelength).