Ultra Compact UWB Microstrip Antenna for Use in IOT Sensor

In this communication, structure of an Ultra Compact, UWB (Ultra Wideband), simple structure, single feed as well as cheap microstrip antenna with two different linear polarizations for using in IOT (Internet of Thing) application is described. According to our approach, antenna compactness is achieved by means of a modified circular patch for current path enlargement and a partial slotted ground providing additional degrees of freedom that help to achieving impedance matching in the whole frequency band. Proposed antenna consists of a circular slotted copper patch and a partial modified ground plane printed on two sides of low cost substrate, FR4-epoxy with dielectric constant 4.3 and loss tangent 0.023. Simulated results provide good radiation characteristics such as omnidirectional radiation pattern, good gain and return loss. The antenna has width impedance bandwidth from 3.1GHz to 11GHz with VSWR<2 as well frequency bandwidth with S<-10 dB. The prototype is fabricated with dimensions of 11 mm width and 15mm length with 1.6 mm thickness (the suggested antenna occupies a small space with footprint of 165mm2 and tested for impedance matching and radiation characteristics over a large frequency spectrum. Experimental validation and simulation characteristics are in good agreement.

Keywords:

microstrip antenna , UWB , Dual polarised , IOT Sensor