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Design and Fabrication of Triple Band Antenna Applicable to GPS/DCS/WLAN System

GPS/DCS/WLAN 시스템에 적용 가능한 삼중대역 안테나 설계 및 제작

  • 김민재 (신라대학교 스마트전기전자공학부) ;
  • 박상욱 (신라대학교 스마트전기전자공학부) ;
  • 윤중한 (신라대학교 스마트전기전자공학부)
  • Received : 2019.04.18
  • Accepted : 2019.06.15
  • Published : 2019.06.30

Abstract

In this paper, we propose a triple band antenna for GPS / DCS / WLAN system. The proposed antenna has the characteristics required by considering the interconnection of two strip lines and various slits on the ground place. The total substrate size is $31mm(W1){\times}50mm(L1)$, thickness (h) 1.6 mm, and the dielectric constant is 4.4, which is made of $22mm(W7+W12+W8){\times}43mm(L4+L3)$ antenna size on the FR-4 substrate. From the fabrication and measurement results, bandwidths of 340 MHz (1.465 to 1.805 GHz), 480 MHz (2.155 to 2.635 GHz) and 1950 MHz (4.975 to 6.925 GHz) were obtained on the basis of -10 dB. Also, gain and radiation pattern characteristics are measured and shown in the frequency triple band as required.

본 논문에서는 GPS/DCS/WLAN에 시스템에 활용 가능하도록 삼중대역 안테나를 제안하였다. 제안된 안테나는 두 개의 스트립 선로와 접지면에 세 개의 슬릿을 삽입하여 요구하는 주파수 대역과 반사손실 특성을 얻었다. 제안된 안테나는 $31mm(W1){\times}50mm(L1)$의 크기와 두께(h) 1.6 mm, 그리고 비유전율이 4.4인 FR-4 기판 위에 $22mm(W7+W12+W8){\times}43mm(L4+L3)$의 크기로 설계되었다. 제작 및 측정결과로부터, -10dB 기준으로 340 MHz (1.465~1.805 GHz), 480 MHz (2.155~2.635 GHz), 1950 MHz (4.975~6.925 GHz)의 대역폭을 얻었다. 또한 요구되는 주파수 삼중대역에서 이득과 방사패턴 특성을 측정하여 나타내었다.

Keywords

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그림 1. 제안된 GPS/DCS/WLAN 안테나의 구조 Fig. 1 Structure of the proposed GPS/DCS/WLAN antenna

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그림 2. 제안된 GPS/DCS/WLAN 안테나의 설계과정 Fig. 2 Design process of proposed GPS/DCS/WLAN antenna

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그림 3. 그림 2의 안테나 설계과정에 따른 시뮬레이션 반사손실 Fig. 3 Simulation reflection loss according to the antenna design process of Figure 2

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그림 4. L3 길이 변화에 의한 시뮬레이션 반사손실 Fig. 4 Simulation return loss due to L3 length change

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그림 6. 그림 5의 슬릿 영향에 의한 시뮬레이션 반사손실 Fig. 6 Simulated reflection loss due to slit effect in Fig. 5

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그림 7. 제안된 안테나의 전류분포 (a) 1.80 GHz, (b) 2.45 GHz, (c), 5.60 GHz Fig. 7 The current distribution of the proposed antenna (a) 1.80 GHz, (b) 2.45 GHz, (c), 5.60 GHz

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그림 8. 제안된 안테나의 프로토 타입 (a) 앞면 (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 Fig. 9 The measured return loss results of the proposed antenna

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그림 10. 1.50 GHz에서 측정된 3-D 방사패턴 Fig. 10 Measured 3-D radiation pattern in 1.50 GHz

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그림 11. 1.80 GHz에서 측정된 3-D 방사패턴 Fig. 11 Measured 3-D radiation pattern in 1.80 GHz

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그림 12. 2.45 GHz에서 측정된 3-D 방사패턴 Fig. 12 Measured 3-D radiation pattern in 2.45 GHz

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그림 13. 5.60 GHz에서 측정된 3-D 방사패턴 Fig. 13 Measured 3-D radiation pattern in 5.60 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

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그림 5. (a) 슬릿 3을 삽입 했을때 (b) 슬릿 2와 슬릿 3이 대칭일 때 Fig. 5 (a) When slit 3 is inserted (b) When the slit 2 and the slit 3 are symmetrical

표 1. 설계된 안테나의 파라미터 Table 1. Parameter of the designed antenna

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