The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Design and Fabrication of Triple-Band Antenna with Three Branch Lines for WLAN Applications

세 개의 분기선로를 갖는 WLAN에 적용가능한 삼중대역 안테나 설계 및 제작

  • 하성재 (한국폴리텍대학 신기술연수센터 정보통신과) ;
  • 윤중한 (신라대학교 스마트전기전자공학부)
  • Received : 2018.11.07
  • Accepted : 2019.02.15
  • Published : 2019.02.28
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Abstract

In this paper, a monopole antenna applicable to WLAN standardization is designed, fabricated, and tested. The proposed antenna is designed to have three microstrip lines based on microstrip feeding method and inserted one stub to enhance impedance characteristics. Then, it obtained triple band characteristics of the proposed antenna. We adjusted and optimized the lengths and width of the three microstrip lines and one inserted stub to obtain the required impedance bandwidth for this paper. The proposed antenna has $23.0mm(W){\times}53.1mm(L1)$ on a dielectric substrate of $24.0mm(W1){\times}60.0mm(L){\times}1.0mm$ size. From the fabrication and measurement results, bandwidths of 158 MHz (841 to 1000 MHz) for 900 MHz band, 630 MHz (2.32 to 2.95 GHz) for 2400 MHz band, and 1,040 MHz (4.95 to 5.99 GHz) for 5000 MHz band were obtained based on the impedance bandwidth. The fabricated antenna also obtained the measured gain and radiation pattern characteristics in the required triple band of the proposed antenna.

본 논문에서는 WLAN 표준화에 적합하도록 삼중대역 안테나를 설계, 제작 및 측정하였다. 마이크로스트립 급전방법을 적용하여 세 개의 마이크로스트립 선로를 갖도록 설계하였으며 임피던스 특성을 향상시키기 위해 하나의 스터브 추가하여 삼중대역 특성을 얻었다. 요구되는 주파수 대역과 임피던스 대역폭을 얻기 위해 세개 분기 선로의 길이와 폭을 설정하고 스터브 길이를 조정하고 최적화하였다. 제안된 안테나는 $24.0mm(W){\times}60.0mm(L){\times}1.0mm(t)$의 유전체 기판 위에 $23.0mm(W_2+W_4){\times}53.1mm(L_1)$의 크기로 제작되었다. 제작 및 측정 결과로부터 900 MHz에서는 159 MHz (841~1000 MHz), 2400 MHz 대역에서는 630 MHz (2.32~2.95 GHz) 그리고 5000 MHz 대역에서는 1,040 MHz (4.95~5.99 GHz)의 대역폭을 얻었다. 또한 무반사실의 측정결과로부터 제작된 안테나의 이득과 방사패턴 특성을 확인하였다.

Keywords

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그림 1. 제안된 안테나의 구조 Fig. 1 Configuration of the proposed WLAN antenna

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그림 2. L2 길이 변화에 따른 반사손실 특성 Fig. 2 Return loss characteristic of the effect of the L2.

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그림 3. L3 길이 변화에 따른 반사손실 특성 Fig. 3 Return loss characteristic of the effect of the L3.

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그림 4. L9 길이 변화에 따른 반사손실 특성 Fig. 4 Return loss characteristic according to the length of L9.

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그림 5. 스터브 유무에 따른 반사손실 특성 Fig. 5 Return loss characteristic according to the with and without stub

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그림 6. 제안된 안테나의 설계 과정에 따른 반사손실 특성 Fig. 6 Return loss characteristics of the proposed antenna design process

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그림 7. 제안된 안테나의 전류 분포(a) 922.5 MHz, (b) 2.42 GHz, and (c) 5.44 GHz. Fig. 7 The current density of proposed antenna (a) 922.5 MHz, (b) 2.42 GHz, and (c) 5.44 GHz.

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그림 8. 제안된 안테나의 시제품 (a) 앞면 그리고 (b) 뒷면 Fig. 8 Prototype of the proposed antenna: (a) front view and (b) back view

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그림 9. 제안된 안테나의 측정된 반사손실 결과 Fig. 9 The measured return loss results of the proposed antenna

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그림 10. 910 MHz에서 측정된 3-D 방사패턴 Fig. 10 Measured 3-D radiation pattern in 910 MHz

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그림 11. 2.44 GHz에서 측정된 3-D 방사패턴 Fig. 11 Measured 3-D radiation pattern in 2.44 GHz

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그림 12. 5.35 GHz에서 측정된 3-D 방사패턴 Fig. 12 Measured 3-D radiation pattern in 5.35 GHz

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그림 13. 5.75 GHz에서 측정된 3-D 방사패턴 Fig. 13 Measured 3-D radiation pattern in 5.75 GHz

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그림 14. 제안된 안테나의 측정된 최대 그리고 평균 이득 Fig. 14 Measured peak and average gains of the proposed antenna

표 1. 설계된 안테나의 파라미터들 Table 1. parameters of the designed antenna

KCTSAD_2019_v14n1_119_t0001.png 이미지

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