Dual mode bandpass filter using trefoil torus knot resonator
Generation of circularly polarized conical beam pattern using toroidal helical knot antenna
Trefoil Torus Knot Monopole Antenna
Wideband Circularly Polarized Dielectric Bird-Nest Antenna With Conical Radiation Pattern
Compact-Size Low-Profile Wideband Circularly Polarized Omnidirectional Patch Antenna With Reconfigurable Polarizations
Circularly Polarized Conical-Beam Antenna With Wide Bandwidth and Low Profile