A review on antenna technologies for ambient RF energy harvesting and wireless power transfer: Designs, challenges and applications

MA Ullah, R Keshavarz, M Abolhasan, J Lipman… - IEEE …, 2022 - ieeexplore.ieee.org
Radio frequency energy harvesting (RFEH) and wireless power transmission (WPT) are two
emerging alternative energy technologies that have the potential to offer wireless energy …

Microwave sensor loaded with complementary curved ring resonator for material permittivity detection

X Han, X Li, Y Zhou, Z Ma, P Peng, C Fu… - IEEE Sensors …, 2022 - ieeexplore.ieee.org
In the field of microwave measurement, how to miniaturize devices and improve
measurement sensitivity is a major challenge. In this article, a planar microwave sensor …

Compact multi-service antenna for sensing and communication using reconfigurable complementary spiral resonator

A Raza, R Keshavarz, E Dutkiewicz… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
In this article, a compact multiservice antenna (MSA) is presented for sensing and
communication using a reconfigurable complementary spiral resonator. A three turns …

Low-cost and low-frequency impedance meter for soil water content measurement in the precision agriculture scenario

P Placidi, CV Delle Vergini, N Papini… - IEEE Transactions …, 2023 - ieeexplore.ieee.org
The use of low-cost embedded devices with ubiquitous connectivity systems is a possible
strategy to monitor the consumption of water used in agriculture even in countries that do not …

Compact pixelated microstrip forward broadside coupler using binary particle swarm optimization

K Parsaei, R Keshavarz, RM Boroujeni… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
In this paper, a compact microstrip forward broadside coupler (MFBC) with high coupling
level is proposed in the frequency band of 3.5 3.8 GHz. The coupler is composed of two …

Highly Sensitive Differential Microwave Sensor Using Enhanced Spiral Resonators for Precision Permittivity Measurement

N Nikkhah, R Keshavarz, M Abolhasan… - IEEE Sensors …, 2024 - ieeexplore.ieee.org
This article presents a highly sensitive microwave sensor for dielectric sensing. One of the
main disadvantages of microwave resonant-based sensors is cross sensitivity originated by …

Modified Hilbert resonator-based transmission line sensor for Moisture level estimation of Soil

A Musa, T Alam, MT Islam - IEEE Sensors Journal, 2023 - ieeexplore.ieee.org
This article presents a highly sensitive modified Hilbert resonator (HR)-based transmission
line sensor for moisture level estimation of soil. The HR sensor offers significant advantages …

In Situ Wide-Range Permittivity Measurement: Compact, Cost-Effective, and Highly Sensitive Sensor Using Reconfigurable Phase Shifter

R Keshavarz, N Nikkhah… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
This work presents a low-cost, compact-size and highly sensitive sensor based on a
Reconfigurable Phase Shifter (RPS) that is designed, simulated, fabricated and tested using …

Precision Agriculture: Ultra-Compact Sensor and Reconfigurable Antenna for Joint Sensing and Communication

A Raza, R Keshavarz, N Shariati - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
In this article, a joint sensing and communication system is presented for smart agriculture.
The system integrates an ultra-compact soil moisture sensor (UCSMS) for precise sensing …

Enabling Wireless Communications, Energy Harvesting, and Energy Saving by Using a Multimode Smart Nonlinear Circuit (MSNC)

R Keshavarz, DL Sounas, S Keshavarz… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
In this article, a multimode smart nonlinear circuit (MSNC) for wireless communications
(transmitting (Tx) and receiving (Rx) modes) as well as energy harvesting (EH) and power …