ANTENNA MEASUREMENT Optimization of the Acid Catalyst Concentration for Synthesis of Anti‐Cancer Agent Gamavuton‐0 by Using Mathematical and Statistical Software

a b c d e f Figure . result of radiation pattern a No. b No. c No. d No. e No. f No. -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9.0GHz 9.8GHz 9.4GHz -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9GHz 9.4GHz 9.8GHz -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9GHz 9.4GHz 9.8GHz -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9GHz 9.4GHz 9.8GHz -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9GHz 9.4GHz 9.8GHz -40 -30 -20 -10 30 60 90 120 150 180 210 240 270 300 330 9GHz 9.4GHz 9.8GHz 7

5. CONCLUSION

X‐band antenna for the airborne SAR mission has been designed and measured in this paper. The performance of proposed antenna has been examined using return loss, axial ratio, radiation pattern, and gain. Originally, 8‐module array antenna has been designed to support 8 Mz of bandwidth and circular polarization. owever only ‐ moule antenna has been examined in this paper. We separate each module and measure the performance in anechoic chamber. All the module shows satisfactory return loss characteristics. n the respect of axial ratio performance, half of modules have achieved design requirement; module No. , No. , and No. . On the other hand, module No. , No. , and No. could achieve only half of requirement. n case of radiation pattern, every antenna shows that its beam has been tilted around degree from the beam center. Last, gain has been measured, however, module No. could not achieve the requirement value. As a reason, effect of sequential array method used in measured antenna is considered. Usually, in high frequency band, the size of antenna become smaller than low frequency band. n addition, the measured antenna has elements of x to realize sequential array and all element has phase difference. Therefore, the feed network for each element become more complicated than usual one. Therefore, small error which doesn’t affect result usually become non‐negligible error and affect to the result. n the future we will operate the proposed antenna using array. Then, as an effect of sequential array method, the proposed antenna can be used for airborne SAR mission. References C.A.Balanis, Antenna Theory Analysis and Design, John illey Sons, nc, . V. Senthil Kumar, V.V.Srinivasan, V.K. Lakshmeesha and S.Pal Sequentially Rotated Microstrip Array Antenna at X‐Band for Spacecraft” EEE, Yo, T.‐C., C.‐M. Lee,andC.‐. Luo. Compact circular polarized patch antenna with harmonic rejection. Microwave and Optical Techology Letters, : ‐ 8, 8.