Research On Compact Wideband Magneto-Electric Dipole Antenna

With the rapid development of modern wireless communication,wireless communication systems have placed a greater demand on the functions of antenna.Some occasions generally require antennas with some specific characteristics like wide operating bandwidth,low cross polarization and high front-to-rear ratio,etc.So they can realize good radiation characteristics and high radiation gain in the operating frequency band.At the same time,new demands are placed on the size of antennas,they are hoped to be miniaturized and integrated.The concept of Magneto-Electric dipole antenna was proposed in 1954,but the antenna model proposed in the early researches has obvious shortcomings that cannot be applied to actual engineering.Until 2006,this situation has changed with the presence of complementary Magneto-Electric dipole model.The main research of this paper is preceded on the base of this complementary Magneto-Electric dipole antenna.The specific work done is as follows:(1)The horizontal rectangular patch is optimized,and two broadband magnetic dipole antennas are proposed.The electromagnetic dipole antenna loaded with the split ring resonator realizes a relative bandwidth of 51%(VSWR?2),and the gain is stable above 7.29dBi in the operating frequency band,with a low fluctuation.The complementary electromagnetic dipole antenna loaded with the short-circuit bridge realizes a relative bandwidth of 56%(1.68 GHz-3.00 GHz,VSWR?2),and the gain is stable at 9dBi.(2)Design of the compact electromagnetic dipole antenna.This paper changes the original feeding structure to coaxial.Then effectively folds the antenna to a lower profile height of 15mm.The operating frequency band of the antenna is 2.03 GHz to 2.97 GHz,the relative bandwidth is 37.6%(VSWR?2),and the gain is maintained above 9dBi and is quite stable with a good directionality.Based on this compact structure,an eight-element uniform linear array is designed.The simulation analysis shows that the array antenna has a gain of more than 16dB,the half-power lobe width in the vertical plane is more than 60°,and the half-power lobe width in the horizontal plane is a little narrower.(3)Design of a millimeter-wave magneto-electric dipole antenna with a through-hole structure,and printed on the surface of the dielectric substrate.The antenna model operates from 27.0 GHz to 41.64 GHz(the relative bandwidth is 42.6%,VSWR?2).Good radiation directivity is obtained in the working frequency band,and it maintains a high level of gain in most operating frequency bands with low fluctuations.