A Low-Profile Magneto-Electric Dipole Antenna with Wideband Characteristics

This study developed a small, low-profile magneto-electric dipole antenna with wideband characteristics by adding a capacitively loaded loop (CLL) structure and stubs. The proposed antenna consists of an electric dipole, a magnetic dipole, and a reflector. The folded reflector and bent electric dipole that constitute the antenna operate as a CLL at low frequencies, thereby substantially reducing the electrical size of the antenna. The rectangular stubs attached to the electric dipole compress the higher-order modes of the dipole, expanding the bandwidth of the antenna. The electrical size of the proposed antenna is 0.316 x 0.292 x 0.0389 lambda(L3), its -10 dB impedance bandwidth is 0.73 to 1.97 GHz (91.9%), and the gain achieved within the operating bandwidth is 4.3 to 6.7 dBi.