| Summary: | 碩士 === 國立暨南國際大學 === 光電科技碩士學位學程在職專班 === 103 === In conventional planar dual antenna array, a method for increasing the isolation between the two antennas and improving the gain of the antenna, is to increase the distance between the two antennas, unfortunately makes the overall area of dual antenna arrays to increase. In order to reduce the overall antenna size and increase two antenna arrays isolation. The paper proposed a differential feeding structure combined with the single element of the antenna array to solve the problem of this dual antenna array. This approach uses the antenna feeding structure by 180 degrees differential ports and microstrip power divider to construct the each element of antenna array so that increased isolation then adjust the space of each element of antenna array to half-wavelength in medium to increase antenna gain.
The antenna design is similar to leaky- wave antenna approach, using only differential feeding architecture to reduce the even mode coupling noise of antenna radiation field, but does not increase with the length of each antenna stripe, so the higher modes are not excited and radiated field did not into the leaky-mode. Therefore, the differential feeding structure antenna as the title of this paper, and the operating frequency of the antenna used for paper from 10.3GHz to 10.54GHz.
The data validation is simulated by ZelandTM IE3D electromagnetic field simulation software for the antenna stipe, differential feeding structure, power divider, two-element antenna array, and four-element antenna array. The results are also compared with the antenna array of single-ending feeding structure have more isolation and higher gain. Finally, through the scattering parameters measurement of vector network analyzer and the antenna field measurement were provided by SmartAnt Telecom Company, the result is proved consistent with the actual measured values and confirmed the proposed design is feasible. Using the design of this paper to adjust the size of the antenna can be used on different frequencies, can be also used in different fields of product development in the future is to be expected.
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