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 …

Highly sensitive and compact quad-band ambient RF energy harvester

R Keshavarz, N Shariati - IEEE Transactions on Industrial …, 2021 - ieeexplore.ieee.org
A highly efficient and compact quad-band energy harvester (QBEH) circuit based on the
extended composite right-and left-handed transmission lines (E-CRLH TLs) technique is …

Dual-band design techniques for microwave passive circuits: A review and applications

AM Zaidi, T Khan, MT Beg, BK Kanaujia… - IEEE Microwave …, 2022 - ieeexplore.ieee.org
The introduction of new technology in the wireless communication industry increases the
number of frequency bands in the communication environment. Therefore, a communication …

Highly sensitive differential microwave sensor for soil moisture measurement

R Keshavarz, J Lipman, DMMP Schreurs… - IEEE Sensors …, 2021 - ieeexplore.ieee.org
This paper presents a highly sensitive differential soil moisture sensor (DSMS) using a
microstrip line loaded with triangular two-turn resonator (T2-SR) and complementary of the …

High-sensitivity and compact time domain soil moisture sensor using dispersive phase shifter for complex permittivity measurement

R Keshavarz, N Shariati - IEEE Transactions on Instrumentation …, 2021 - ieeexplore.ieee.org
This article presents a time domain transmissometry soil moisture sensor (TDT-SMS) using a
dispersive phase shifter (DPS), consisting of an interdigital capacitor that is loaded with a …

Linearity improvement of a dual-band Doherty power amplifier using E-CRLH transmission line

R Keshavarz, A Mohammadi, A Abdipour - AEU-International Journal of …, 2021 - Elsevier
A dual-band Doherty power amplifier (DB-DPA) using the extended composite right and left
handed transmission lines (E-CRLH TL) is proposed. In this structure the λ/4 transmission …

Low profile metamaterial band-pass filter loaded with 4-turn complementary spiral resonator for WPT applications

R Keshavarz, N Shariati - 2020 27th IEEE International …, 2020 - ieeexplore.ieee.org
In this paper, a very compact (0.03 λg× 0.18 λg) and low insertion loss (<; 0.4 dB)
metamaterial band-pass filter (MBPF) at the center frequency of f 0= 730 MHz is proposed …

Compact active duplexer based on CSRR and interdigital loaded microstrip coupled lines for LTE application

S Keshavarz, R Keshavarz… - Progress In …, 2021 - opus.lib.uts.edu.au
In this paper, a four-port compact active duplexer based on a complimentary split ring
resonator (CSRR) and interdigital loaded microstrip coupled lines (CSRR-IL MCL) is …

Electrically tunable microwave technologies with ferromagnetic thin film: recent advances in design techniques and applications

J Ge, T Wang, Y Peng, G Wang - IEEE Microwave Magazine, 2022 - ieeexplore.ieee.org
The rapidly growing wireless communication market has resulted in tremendous changes in
the requirements and capabilities of radios to support numerous multiband wireless …

Miniaturized patch rectenna using 3-turn complementary spiral resonator for wireless power transfer

A Raza, R Keshavarz, N Shariati - 2021 IEEE Asia-Pacific …, 2021 - ieeexplore.ieee.org
A miniaturized linearly-polarized patch antenna is presented for Wireless Power Transfer
(WPT) at 1.8 GHz. The proposed antenna consists of a patch element and a 3-turn …