Study Of Solar Cell Integrated Broadband Planar Spiral Array Antenna

With the continuous popularity of environmental protection,the application of solar energy as a renewable energy source in communication systems has attracted more and more attention,and it is gradually replacing traditional power sources as an alternative to system power supply.The effective integration of solar cells and antennas can reduce the volume occupied by the communication system and at the same time reduce the cost of power supply.At present,solar cell integrated antennas have narrow bandwidth and low gain,making it difficult to apply in the field of broadband communications,and most of the research focuses on integration with antenna units.The planar spiral antenna has the advantages of wide frequency bandwidth,good circular polarization performance,and easy integration.Based on this situation,this paper studies the solar cell integrated planar spiral array antenna,and the main work is as follows:1.Researched the laminated structure and impedance characteristics of solar cells.Firstly,it is proposed that the solar cell is used as the reflector of the antenna,and the antenna uses the cover glass of the solar cell as the substrate to achieve integration.Secondly,the structure model of the solar cell antenna is established,and the solar cell integrated planar spiral array antenna for broadband communication is proposed.2.A 4×4 single-arm spiral antenna array integrated with solar cells is designed.First,the single-arm spiral antenna is gridded to increase the light transmittance to 92%;secondly,the influence of two solar cells with different structures on the antenna is analyzed;finally,based on the unit,a 4×4 is designed and prepared.The solar cell integrated antenna array with high light transmittance has a simulated impedance bandwidth of 1.1-3.2 GHz,an axial ratio bandwidth of 1.18-3.15 GHz,and a maximum gain of 19.8 d Bi.The array test and theoretical simulation have good consistency.In addition,it is proposed to further integrate the Electromagnetic Band Gap(EBG)structure with the solar cell antenna unit to reduce the height of the antenna in the vertical direction.With the other properties of the antenna unchanged,the profile height can be reduced by 1/3.3.In order to further broaden the bandwidth of the solar cell integrated antenna array,a4×4 broadband laminated spiral antenna array integrated with solar cells is proposed.Firstly,the feed structure is simplified by replacing the balun with a graded microstrip line structure,and the current path is extended by using a laminated form,which effectively expands the antenna bandwidth.Secondly,the light transmittance is increased from 66.3% to 89.7%through the antenna grid,and the greater radiation efficiency is ensured under high light transmittance by optimizing the grid density.Finally,a 4×4 broadband solar cell integrated antenna array is designed and prepared.The simulated impedance bandwidth is 0.73-3 GHz,the axial ratio bandwidth is 0.95-3.5 GHz,and the maximum gain is 16.5 d Bi.The final test results and simulation have good results.Consistency,the solar cell antenna array has a larger bandwidth and light transmittance.