Design Of Dual-polarized Narrow Beam Antenna For Large Stadium

With the improvement of living standards,people's pursuit of cultural activities is getting higher and higher.As the site of various major events,large stadium has become an important place to enjoy life.When activities are organized in large stadium,the user density is great and the volume of communication is very high.Therefore,the communication coverage of large stadium is of great significance.Large stadium which coverage environment is complex has significant regional characterisitics.And the user density of the audience area is great.So the area needs to be divided into multiple cells and the use of narrow beam high-gain directional antenna is a good solution to achieve the depth coverage.On the same time,dual-polarized antenna scheme can achieve dual channel transceiver in 4G networks.Besides,the coexistence of the 2G/3G/4G systems needs to be taked into account.Therefore,the design of dual-polarized narrow beam directional antenna for depth coverage of large stadium on the whole frequency band of 2G/3G/4G mobile communication systems has good application prospect and research significance.For the needs of engineering applications above,a dual-polarized narrow beam large stadium antenna was designed,which can meet the need of communication coverage of Hebei Olympic Sports Stadium.With the characterists of high gain and narrow beam,the antenna can achieve the dual-polarized converage requirement of large stadium on the whole frequency band of 2G/3G/4G mobile communication systems.During the design,the pattern multiplication theorem and the method of equivalent cell spacing were proposed to analyze several arrays which are composed of a few units.According to the method,suitable array scheme was founded out,and then the electromagnetic simulation for the antenna model was carried out by HFSS software.Besides,the feeding network of the stadium antenna was designed which includes power divider and combiner.After fabrication and measurement of the power divider and combiner,the results show that both of these components have excellent performance.Then the large stadium antenna was manufactured,assembled and measured.And the results show that both the circuit parameters and radiation parameters of the stadium antenna can meet the target requirements on the low frequency band 820-960 MHz and high frequency band 1710-2690 MHz.It also means that the use effect of the antenna is fine.On the other hand,dielectric radome must be used in mobile communication antennas.Its dielectric characteristics strongly affect the performances of antenna.So it is significant to measure the dielectric constant of dielectric easily and efficiently.Therefore,a device for nondestructive measurement of dielectric constant was designed.And the measurement error was improved by using the variational method.Besides,the corresponding software was also developed.This measurement device has been used in the process of antenna product's design.