It uses a modified bowtie antenna
to collect the electromagnetic energy coming from UHF RFID systems, and Schottky diodes for the RF-to-DC conversion.
We considered three antenna types: A homemade Vivaldi antenna, a linear polarized double-ridged horn antenna (BBHA 9120-F, Schwarzbeck Mess-Elektronik, Schonau, Germany) and a commercial bowtie antenna
(400-MHz GSSI, Geophysical Survey Systems, Inc.
To improve the single polarization characteristics of a bowtie antenna
, a cross bowtie structure is adopted to implement a dual-polarized absorber.
In this section, a simple bowtie antenna
made of Cu is placed above the graphene-based AMC ground plane, as shown in Figures 6(a) and (b).
An SBH is comprised of a slotline transmission line that gradually flares into a folded bowtie antenna
Ng, "Wideband millimeter-wave cavity-backed bowtie antenna
," Progress In Electromagnetics Research, Vol.
Our simulation results show that the FBBA antenna may be optimized to yield extraordinary enhancement of the localized near-field by more than 1,800 times which is far higher than what can be achieved by a conventional bowtie antenna
with the same gap separation.
Electromagnetic radiation is received only within two dielectric wavelengths of the center of a bowtie antenna
supported by a dielectric substrate.
In [22, 23], a cavity-backed folded triangular bowtie antenna
and a cavity-backed triangular bowtie dipole antenna have also achieved unidirectional radiation patterns and with an impedance bandwidth of 92.
Ultrawideband composite cavity-backed folded sectorial bowtie antenna
with stable pattern and high gain," IEEE Trans.
Cannarile, "Broadband bowtie antenna
for RF energy scavenging applications," Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011, 335-337, 2011.
Nojima, "Leaf-shaped bowtie antenna
backed by a periodic patch-loaded grounded slab," IEEE International Symposium on Antennas and Propagation (APSURSI), 622-625, 2011.