Research On Omnidirectional Antenna Based On Glass Dielectric Resonator

With the rapid development of communication technology,people have higher and higher requirements for wireless communication system.As the equipment of electromagnetic wave receiving and transmitting,antenna plays an important role in wireless communication system.Dielectric resonator antenna as a new type of antenna,has attracted more and more attention.It has many advantages: the unique three-dimensional structure of dielectric resonator makes the design of antenna more flexible;at the same time,dielectric resonator has no conductor loss and high radiation efficiency;in addition,dielectric resonator antenna has the advantages of easy integration and various feeding modes.Therefore,the research of dielectric resonator antenna is of great significance in the field of antenna.In recent years,it has been found that the dielectric constant of glass can be as high as7 at 2GHz,which makes glass can also be used as a dielectric resonator.At the same time,due to the transparency of glass,the glass dielectric resonator antenna often has a second function.The omnidirectional antenna can cover a wider range,which is more favorable for indoor communication.In this paper,the omnidirectional antenna is studied based on glass dielectric resonator,and the specific work includes:1.A replaceable wideband glass dielectric resonator antenna is designed,which consists of a cylindrical glass dielectric resonator and a feeding platform.The glass dielectric resonator and the feeding platform are connected by two magnet patches.Because the magnet patches are easy to replace,it is easy to replace different dielectric resonators.Different sizes of dielectric resonators can be selected according to the requirements to obtain different bandwidth and gain.The formula of the ratio of the antenna bandwidth to the height radius of the dielectric resonator is derived.At the same time,laser engraving technology is introduced into the glass dielectric resonator,which makes the antenna have the second function as an aesthetic handicraft.The dielectric resonator with the widest relative bandwidth can achieve 74% of the relative bandwidth,covering the frequency band of 2.96-6.44 GHz,and the gain in the frequency band is maintained above 2d Bi.The dielectric resonator with the highest gain can achieve a peak gain of 5.16 d Bi,with a relative bandwidth of 39.5%,covering the frequency band of 3.17-4.73 GHz.2.A slot fed omnidirectional low profile glass dielectric resonator antenna is designed.The antenna uses a quarter Wilkinson power divider as the feeding network to excite four arced slots to generate omnidirectional mode,replacing the traditional probe excitation method.Using this method,there is no need to add any parasite,and the complex process of using probe to punch holes in the fragile dielectric resonator is avoided.At the same time,the problem that it is difficult to use probe to excite the low profile dielectric resonator antenna is solved.The antenna has a relative bandwidth of 33.5%,frequency coverage of4.89 – 6.86 GHz,and peak gain of 5d Bi.3.A slot fed omnidirectional circularly polarized glass dielectric resonator antenna is designed.The antenna uses a quarter Wilkinson power divider as the feeding network to excite four rectangular slots to generate omnidirectional circularly polarized mode.Four rectangular slots and four end feeders are placed at an angle of 45 ° to excite two equal amplitude orthogonal omnidirectional modes.The omnidirectional circularly polarized dielectric resonator antenna with 8% axial bandwidth is realized.The frequency coverage is5.62-6.09 GHz,and the peak gain can reach 5.6 d Bic.