filtering antenna Antenna design 1 Antenna grounds 1 Bandwidth 1 Characteristic mode analyse 1 Characteristic modes 1 Design 1 Filtering antenna 1 Magnetic currents 1 Mode analysis 1 Radiation null 1 Simple structures 1 Slot antennas 1 Stable gain 1 Wide-band 1 article 1 bandwidth 1 bow-tie antenna 1 characteristic mode analysis 1 dielectric resonator antenna 1 filtration 1 harmonics suppression 1 magnetic current 1 quasi-isotropic pattern 1 radiation nulls 1 simulation 1 stable gain 1