Abstract
A miniaturized microwave sensor for internet of things (IoTs) is
presented. The proposed sensor though a periodic structure exhibits two
intrinsic resonances namely: the spatial wavelength due to its periodic
geometric structure, and the radiation wavelength due to applied voltage source
to the microwave sensor. The wavelength differential between the spatial and
radiation wavelengths is employed for the sensing based on the electrical
impedance tomography of the sensed material. The miniaturized capability of
the proposed sensor is investigated based on some available formulae using
Matlab code for parameter extraction, and also with finite integration technique
electromagnetic (EM) codes. A proof-of-concept prototyped sensor is
fabricated on a printed circuit microwave laminate board in order to validate the
miniaturized capability of the proposed sensor. Findings indicate a superior
impedance match, substantial impedance bandwidth, robust gain, cost
effectiveness, compared to AoC/AiPs with associated losses due to the silicon
substrate.