No abstract

No abstract

The realisation of an electronically tuned polarisation reconfigurable dielectric resonator antenna with multiple switchable states is described in this study. The antenna is fed by a microstrip line through a cross‐slot aperture placed in the ground plane to achieve circular polarisation. PIN diodes have been placed across the cross slots to control their effective dimensions and thereby its sense of polarisation. The antenna is connected to a microcontroller (ARDUINO‐UNO) to switch between corresponding polarisation states. Simulated results of the antenna are verified with experimental data. The antenna has an impedance bandwidth of about 20% for all four states of polarisations. The antenna also radiates with a gain of 4 dB over the entire band.

Novel closed form expressions to investigate CPW-fed miniaturized planar monopole antennas are presented. The analysis of a CPW-fed strip monopole structure is further extended to derive expressions for the input impedances of miniaturized strip-monopoles supporting slow wave propagation. The concept includes the modification of the propagation constants of the structures and the modeling of them into their equivalent straight rectangular strip-monopoles on planar substrates. The meandered/miniaturized strip-monopole radiators are disintegrated to model them as the superposition of simpler structures and circuit theoretic analyses are performed. The correctness of the reported expressions is validated against the simulations as well as the experimental measurements. Such closed-form analysis facilitates simpler design procedures against other available techniques such as conformal mapping and full wave analysis. The circuit theoretic approach reduces the computational requirements as against the available commercial EM solvers and provides a suitable interface platform for system analysis.

No abstract