Characteristics of a Microstrip Circularly-Polarized Aperture-Patch $8\times8$ Array Antenna

마이크로스트립 원형 편파 개구면-패치 $8\times8$ 배열 안테나의 특성

  • 김인광 (현대전자산업주식회사 통신연구소) ;
  • 박위상 (포항공과대학교 전자전기공학과, 전자파특화연구센터)
  • Published : 1999.12.01


The radiation characteristics of a microstrip circularly-polarized aperture-patch $8\times8$ array antenna are investigated at X-band. The radiator consists of a truncated square aperture on the ground plane with an inclined rectangular patch inside, and it is coupled by a microstrip line on the opposite side of the ground. The element spacing of the array was chosen as $0.8\lambda_0$so as to minimize the mutual coupling and maximize the gain. A corporate feed network was employed to distribute the power to each element through four Wilkinson and two T-junction dividers. Measurement results for the $8\times8$ array at 10 GHz showed a directivity of 26.3 dBi, a gain of 22.2 dBi, an axial ratio of 2.97 dB, and a side lobe level of -12.7dB. It was observed that when the array size increases, the directivity increases while the efficiency decreases.



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