A Three-Port Polarization and Pattern Diversity Ring Antenna
يوليو 01, 2018
Kushmanda Saurav
Nazih Khaddaj Mallat
Yahia Antar
In this letter, a novel design of a three-port antenna exhibiting pattern and polarization diversity characteristics is proposed. The radiating element of the proposed antenna comprises a ring loaded with periodical interdigital capacitors. The selective excitation of the three ports of the antenna enables omnidirectional and dual-polarized broadside radiation patterns in an overlapping bandwidth of 73 MHz (2.574 -2.647 GHz). The mutual coupling between any set of the two ports in the three-por...
Oscillation criteria for forced and damped nabla fractional difference equations
يونيو 20, 2018
Based on the properties of Riemann–Liouville difference and sum operators, sufficient conditions are established to guarantee the oscillation of solutions for forced and damped nabla fractional difference equations. Numerical examples are presented to show the applicability of the proposed results. We finish the paper by a concluding remark.