# Miniaturized Microwave Devices and Antennas for Wearable, Implantable and Wireless Applications

**Authors:** Muhammad Ali Babar Abbasi  
**arXiv:** [1806.00379](https://arxiv.org/abs/1806.00379)  
**Date:** 2018-06-01  
**Summary page:** https://www.summarizepaper.com/en/paper/1806.00379v1/

## Key points

- Thesis explores development of compact microwave devices and antennas
- Objective is to address challenges of miniaturization in antennas and microwave components
- Utilizes theoretical principles such as metamaterials, metasurface coupling resonators, stacked radiators, elementary antenna theory, and transmission line theory
- Considers standards and specifications of next-generation wireless and bio-medical applications
- Proposes compact reconfigurable phase-shifter and microwave cross-over based on negative-refractive-index transmission-line (NRI-TL) materialist unit cells
- Presents wearable sensor architecture based on metasurfaces for off-body communication and efficient radiation towards the human body
- Proposes fully parametrized solution for implantable antenna using metallic-coated stacked substrate layers
- Investigates challenges associated with off-body, on-body, through-body, and across-body communication through simulations and experimental verification
- Focuses on miniaturization of ultra-wideband (UWB) antennas with analytical model for predicting resonance
- Proposes miniaturized rectifiers for efficient wireless power transfer with experimental verification

## Summary

This thesis, titled "Miniaturized Microwave Devices and Antennas for Wearable, Implantable, and Wireless Applications," explores the development of microwave devices and antennas that are both compact in size and maintain high operational efficiency. The primary objective is to address the challenges of miniaturization in antennas and microwave components by utilizing theoretical principles such as metamaterials, metasurface coupling resonators, stacked radiators, elementary antenna theory, and transmission line theory. The research takes into consideration the standards and specifications of next-generation wireless and bio-medical applications to ensure advancements in these scientific fields. Several innovative solutions are proposed throughout the thesis. Firstly, a compact reconfigurable phase-shifter and a microwave cross-over based on negative-refractive-index transmission-line (NRI-TL) materialist unit cells are presented. These solutions contribute to the miniaturization of microwave devices while maintaining their functionality. Additionally, a wearable sensor architecture based on metasurfaces is proposed. This architecture includes an electromagnetic band-gap (EBG) structure-backed monopole antenna for off-body communication and a fork-shaped antenna for efficient radiation towards the human body. This design aims to enhance communication capabilities between wearable devices and improve overall performance. Furthermore, the thesis proposes a fully parametrized solution for an implantable antenna using metallic-coated stacked substrate layers. The challenges associated with off-body, on-body, through-body, and across-body communication are investigated through computationally extensive simulations and experimental verification. The study also focuses on the miniaturization of ultra-wideband (UWB) antennas. An analytical model is developed to predict resonance in these antennas which facilitates their implementation in various wireless applications. Lastly, several miniaturized rectifiers designed specifically for efficient wireless power transfer are proposed which undergo experimental verification to assess their performance. Overall this research addresses various research questions related to applied electromagnetics in the fields of bio medicine and wireless communication by presenting novel solutions that consider the standards and specifications of next generation applications thus contributing to the advancement of these scientific disciplines.