Open AccessCPW‐fed low‐profile directional antenna operating in low microwave band for wideband medical diagnostic systems
Author(s) -
Mobashsher A.T.,
Abbosh A.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.3909
Subject(s) - wideband , coplanar waveguide , dipole antenna , radiation pattern , optics , loop antenna , microwave , antenna measurement , antenna (radio) , slot antenna , antenna efficiency , acoustics , physics , materials science , optoelectronics , coaxial antenna , electrical engineering , engineering , telecommunications
Medical diagnostic systems demand wideband antennas with directive radiation patterns. In addition, portable systems require low profile and light weight antennas to be incorporated. These necessities of modern microwave‐based diagnostic systems are addressed in this reported work. The antenna is built with two simple thoroughly printed structures connected to each other using two copper walls, forming a loop‐like geometry. The top element is capacitively loaded with a pair of symmetrically placed slots and fed with a coplanar waveguide (CPW). The antenna works like a small loop in the lower resonating mode and as a folded‐dipole in the higher modes. The antenna exhibits a 109% bandwidth with stable radiation patterns of an about 9 dB front‐to‐back ratio over most of the band with only a profile of 0.05 λ ( λ = wavelength at the lowest frequency). The measured and the simulated results show that the proposed antenna is suitable for wideband medical imaging systems.