MZR을 이용한 2.4 GHz WiFi 대역 소형단말기 안테나 설계
Design of Miniaturization Terminal Antenna for 2.4 GHz WiFi Band with MZR
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초록
본 논문에서는 MZR을 사용하여 2.4GHz WiFi대역에서 동작하는 온 보드(on-board) 초소형 안테나를 구현하였다. 설계한안테나는 소형 단말기 PCB의 크기가 78×38×0.8㎣이며, 시스템의 크기는 63×38×0.8 ㎣이고, 방사부의 크기는 15×38×0.8 ㎣인제한조건에서 동작하는 초소형 안테나를 구현하였다. 급전구조는 시스템 보드의 좌측 상단에 급전 점을 설정하고, 안정적인급전을 위해 CPW구조를 사용하였고, 급전부와 안테나의 결합은 자계결합구조를 사용하였다. MZR의 공진주파수는 직렬 커패시터와 셀의 인덕턴스에 의해서 결정됨으로 셀 사이의 갭, 셀의 길이, 인터디지털(interdigital) 커패시터의 길이, 방사부와접지면의 간격에 대하여 분석하였으며, 그 결과를 사용하여 안테나를 설계 제작하였다. 제작한 안테나는 급전구조를 포함한안테나의 전체크기는 20.8×9.0×0.8 ㎣이며, 전기적인 길이는 0.1664 × 0.072 × 0.0064 이다. 측정결과 10 dB 대역폭, 이득과 방향성은 각각 440 MHz(18.3 %), 0.4405 dB, 2.722 dB이다. 방사패턴은 전 방향 특성을 가지고 있음을 확인하였으며,초소형 단말기 안테나에 적용할 수 있음을 확인하였다.
Abstract
In this paper, we implemented an on-board miniaturization antenna operating 2.4 GHz using MZR(Mu Zero Resonator). It is must be operating under the constraint that the size of the small terminal PCB should be 78×38×0.8 ㎣ and the sizeof the system should be 63×38×0.8 ㎣ and the size of the radiating part should be 15×38×0.8 ㎣. The feeding structureuses a CPW structure for stable feeding and a feeding point at the upper left of the system board. A magnetic fieldcoupling structure is used for coupling the feeding part and the antenna. The resonance frequency of the MZR isdetermined by the series inductance and capacitance of the cell, so the gap between the cells, the length of the cell, thelength of the interdigital capacitor, and the spacing between the radiation part and the ground plane are analyzed. Theantenna was designed and fabricated using the results. The total size of the antenna including the feed structure is 20.8×9.0×0.8 ㎣, and the electrical length is 0.1664 × 0.072 × 0.0064 . The measurement result for 10 dB bandwidth,gain and directivity are 440 MHz(18.3%), 0.4405 dB, and 2.722 dB respectively. It is confirmed that the radiation patternhas omnidirectional characteristics and it can be applied to ultra small terminal antenna
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