A Low-Profile Folded Magnetoelectric Dipole Antenna for Mobile Communication

In this letter, a wideband, compact magnetoelectric (ME) dipole antenna with a low profile is proposed. By folding the radiating arms, the overall height of the magnetoelectric dipole antenna is significantly reduced. Additionally, the Unequal-Arms dipole technique is introduced to widen the bandwidth by adding more resonant points. A novel mixed Gamma-type feeding structure, which is embedded in the printed circuit board (PCB) by metal to promote impedance matching and assembly, improves the stability of the structure and reduces the production cost. By properly designed, the folded structure can achieve both low profile and good impedance matching. Finally, an antenna prototype was designed, fabricated, and measured, with the simulated and measured results agreeing well with each other. The proposed antenna achieves a reduced profile of 0.057 lambda (lambda corresponds to a frequency of 1.7 GHz), a 45% bandwidth within the range of 1.7 GHz to 2.7 GHz (S-11<-10 dB), a stable radiation pattern with a gain exceeding 7.3 dBi, and a half-power beamwidth greater than 82.7 degrees in the working band.