• 한국전자통신학회논문지
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• 제8권4호
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• pp.535-540
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• 2013

본 논문에서는 슬롯의 깊이를 변화시켜 X-밴드에서 동작하는 1.4m길이의 도파관 슬롯배열 안테나를 설계하였다. 54개의 슬롯배열이 모델링되어 CST로 시뮬레이션 되었으며 부엽레벨은 주어진 주파수 범위에서 효과적으로 억압되었다. 안테나의 측정 결과 이득은 21.8dB, 최대 부엽레벨은 -31dB, 반전력빔폭은 $2.0^{\circ}$의 결과를 얻을 수 있었다.

• 한국군사과학기술학회지
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• 제16권6호
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• pp.833-840
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• 2013

A radar altimeter which measures the distance using radio wave developed by domestic technology has been applied to various missiles. It is used also for calculating the error of integrated navigation technique. There are a couple of methods to reduce the error but in this paper, we proposed to utilize existing C-band radar altimeter main body with frequency conversion. We designed and manufactured the frequency converter and Ku-band antenna to accomplish this goal. From the test results of products' function and performance, we could expect the possibility of applying this method to enhance the missiles' integrated performance.

• 제어로봇시스템학회논문지
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• 제21권11호
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• pp.1050-1056
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• 2015

In this paper, we use the characteristics of electromagnetic waves underwater attenuation for estimating linear distance between a transmitting node and receiving node, and research underwater vertical plane attenuation model for constructing the underwater localization system. The underwater localization of 2 dimensional with the plane attenuation model in the horizontal plane (H-plane) was proposed previous research. But for the 3 dimensional underwater localization, the additional vertical plane (E-plane) model should be considered. Because the horizontal plane of omnidirectional antenna has the same attenuation tendency in x-y plane according to the distance, whereas in vertical plane shows an irregular pattern in x-z plane. For that reason, in the vertical plane environment, the attenuation should be changed by the position and inclination. Hence, in this paper the distance and angle between transmitting and receiving node are defined using spherical coordinate system and derive an antenna gain pattern using half power beam width (HPBW). The HPBW is called a term which defines antenna's performance between isotropic and other antennas. This paper derives omnidirectional antenna's maximum gain and attenuation pattern model and define vertical plane's gain pattern model using HPBW. Finally, experimental verifications for the proposed underwater vertical plane's attenuation model was executed.

• 한국전자파학회논문지
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• 제30권6호
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• pp.438-444
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• 2019

본 논문에서는 간섭 신호원의 방향을 정확히 탐지 및 식별하기 위해 상호결합특성을 고려한 16소자 배열안테나의 배열 형상 및 개별소자 구조에 대해 연구하였다. 제안된 배열 안테나는 상호결합특성, 능동소자패턴의 편차, 반전력빔폭을 고려하여 개별소자의 접지면간 이격거리를 도출하였다. 개별소자는 마이크로스트립 패치안테나로 구성되며, 광대역 특성 및 안테나의 소형화를 위해 접지면과 연결된 방사체 및 L 모양의 간접 급전 급전부로 구성된다. 제안된 안테나를 사용한 신호탐지 성능 평가 결과 제시된 시나리오 범위 내에서 낮은 RMS(root mean square) error의 성능을 갖는 것을 확인하였다.