Reconfigurable multi-slot antenna for bio-medical applications

Abstract

Abstract-We present a polarization-reconfigurable multislot antenna with four switchable linear polarizations (as 0⁰, ± 45⁰ and 90⁰) for implant communications. The design is based on four bow-tie shaped slots acting as radiators etched on a circular metallization plane with 45⁰ rotated sequential arrangements. RF switches based on PIN diodes are connected across each slot in order to modify the radiators polarization. We apply a differential source to feed the slot antenna through a groundtapered Balun. In order to obtain a broadside radiation pattern, a reflector is placed at the quarter-wave distance below the radiator. Measured results are showing that the realized multislot antenna can generate four switchable linear polarization states with wide bandwidth and stable gain. This polarization diversity feature makes the proposed antenna highly attractive for implant and body-centric wireless communication systems for minimizing the multi-path distortion and polarization mismatching in the wireless channels.

Differentially fed six‐beam switchable reconfigurable antenna

“…A differential pattern reconfigurable antenna in [9] is designed by changing the capacitance of the parasitic element. A reconfigurable multi-slot antenna fed by a differential source is presented in [10], which can switch among four linear polarisations. In [11], a frequency-tunable capacitor-/varactor-loaded differentially fed rectangular DRA is reported.…”

Multi-linear polarization reconfigurable center-fed circular patch antenna with shorting posts

“…The antenna used 12 PIN diodes with measured gains about 3.5 dBi. In [8], [9], four linear polarizations with 30 • rotation were achieved by reconfiguring four slot radiators. However, the large dimensions of the antenna (around 1.22λ×1.22λ×0.26λ at 2.45 GHz) may make it inconvenient to be applied in the antenna array.…”