RF Collimator Design having Multi-Dielectric Structure using the Phase Field Design Method

Joohyun Go; Hong Kyoung Seong; Hanmin Kim; Jinwoo Park; Jeonghoon Yoo

doi:10.7734/COSEIK.2018.31.1.47

All Issue

2018 Vol.31, Issue 1 Preview Page Next Page

RF Collimator Design having Multi-Dielectric Structure using the Phase Field Design Method 페이즈필드 설계법을 이용한 다중 유전체 구조의 RF 콜리메이터 설계

2018. pp. 47-52

PDF XML

Abstract

In this study, a collimator composed of multi-dielectric structures is designed using the phase field design method, a kind of topology optimization methods. It is also purposed to improve the mechanical-structural performance of a collimator by replacing previously used air regions with another dielectric material. Polypropylene and paraffin are selected as the dielectric materials for the design process taking manufacturability into account. The design objective is formulated by integrating the intensity of the electromagnetic field in the pre-determined target area to realize the collimating performance. The model for accurate numerical analysis was derived from the final result obtained from the design process through the simple cut-off method and it shows the improved performance of 105% compared with the free space wave propagation. For the designed model, the possibility of reverse transformation, the mechanical durability evaluation under the compression load, and the electromagnetic performance in the X-band range were also evaluated.

Keywords

multi-dielectric collimator

phase field design method

numerical verification

본 연구에서는 페이즈필드 설계법을 통한 다중 유전체로 구성된 콜리메이터 구조를 설계하였다. 제작 가능성을 고려하여 폴리프로필렌과 파라핀을 유전체 재질로 선정하였고, 측정영역의 전기장의 세기의 면적분으로 계산하여 이를 최대화하는 것 으로 설계의 목적 함수를 설정하였다. 두 가지 유전체 재질을 이용하여 설계영역 내의 중공영역이 배제된 구조를 도출하였 으며 컷오프를 통해 최종 형상을 모델링하였다. 수치해석을 통하여 설계된 다중 유전체 구조의 콜리메이터를 이용하는 경우 자유공간 내의 원형 전자기파 대비 측정영역에서 105%의 전기장 세기가 증가된 평행파를 생성하는 콜리메이터의 성능을 확 인하였다. 설계된 모델의 수치해석을 통하여 콜리메이터의 역변환 가능성과 구조적 내구성의 증가를 확인하였고, X밴드 대 역 전체에서의 성능을 평가하였다.

키워드

다중 유전체 콜리메이터

페이즈필드 설계법

수치해석적 검증

References

Andkjær, J. and Sigmund, O., 2011. Topology optimized low-contrast all-dielectric optical cloak.. Appl. Phys. Lett., 98, p.021112.

10.1063/1.3540687

Choi, J.S., Yamada, T., Izui, K., Nishiwaki, S. and Yoo, J., 2011. Topology Optimization using a Reaction-diffusion Equation.. Comput. Methods Appl. Mech. Eng., 200, pp.2407-2420.

10.1016/j.cma.2011.04.013

Jiang, W.X., Cui, T.J., Ma, H.F., Zhou, X.Y. and Cheng, Q., 2008. Cylindrical-to-Plane-Wave Conversion Via Embedded Optical Transformation.. Appl. Phys. Lett., 92, p.261903.

10.1063/1.2953447

Kim, H., Park, J., Seo, I. and Yoo, J., 2016. Two-dimensional Dielectric Collimator Design and Its Experimental Verification for Microwave Beam Focusing.. Appl. Phys. Lett., 109, p.151902.

10.1063/1.4964604

Kwon, D. and Werner, D., 2008. Transformation Optical Designs for Wave Collimators, Flat Lenses and Right-angle Bends.. Opt. Express, 16, pp.11555-11567.

10.1088/1367-2630/10/11/115023

Leonhardt, U., 2006. Optical Conformal Mapping.. Science, 312, pp.1777-1780.

10.1126/science.112649316728596

Pendry, J.B., Schurig, D. and Smith, D.R., 2006. Controlling Electromagnetic Field.. Science, 312, pp.1780-1782.

10.1126/science.112590716728597

Seong, H.K. and Yoo, J., 2016. Topological Design of the Film-Coupled Nanoparticle for the Field Intensity Enhancement over the Broadband Visible Spectrum.. Appl. Phys. Lett., 108, p.201904.

10.1063/1.4950857

Shelby, R.A., Smith, D.R. and Schultz, S., 2001. Experimental Verification of a Negative Index of Refraction.. Science, 292, p.5514.

10.1126/science.105884711292865

Shin, H., Heo, N., Park, J., Seo, I. and Yoo, J., 2017. All-Dielectric Structure Development for Electromagnetic Wave Shielding using a Systematic Design Approach.. Appl. Phys. Lett., 110, p.021908.

10.1063/1.4974162

Takezawa, A., Nishiwaki, S. and Kitamura, M., 2010. Shape and Topology Optimization based on the Phase Field Method and Sensitivity Analysis.. J. Comput. Phys., 229, pp.2697-2718.

10.1016/j.jcp.2009.12.017

Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 31
No :1
Pages :47-52
Received Date : 2017-11-02
Revised Date : 2018-01-04
Accepted Date : 2018-01-05
DOI :https://doi.org/10.7734/COSEIK.2018.31.1.47

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

All Issue