Dielectric loading effect on periodic microstrip structure

Abstract: Digit-like periodic structures have demonstrated overtly multiple resonances that almost disqualify them as good candidates for microwave circuits, since it is rather difficult to identify their resonance at the dominant mode practically. In this work, an alternative solution to mitigate these spurious resonances is investigated. The dielectric loading effect is examined to determine its efficacy and extent. The results have been validated numerically using the commercially available finite integration technique solver. The findings indicate that the proposed alternative solution is promising. A wide impedance bandwidth or dual-band is achievable, depending on the location of the loading relative to the periodic structure and the feed system

Miniaturized microwave sensor for internet of things wireless connectivity

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