Design of Antennas and Feed Networks for Millimeter-Wave Applications
- 주제(키워드) millimeter-wave , aperture coupled patch antenna , fifth-generation , feed network , 77-GHz radar frontend module
- 발행기관 아주대학교
- 지도교수 감동근
- 발행년도 2018
- 학위수여년월 2018. 8
- 학위명 박사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000028099
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
As demand for mobile and fixed communication systems increases, various studies are underway to use millimeter-wave (mmWave) bandwidths that are higher than the frequencies used in the past. Fifth-generation (5G) mobile communication using the 28-GHz band and Wireless Gigabit Alliance (WiGig) using the 60-GHz band are typical examples. Millimeter-waves with good resolution are also suitable for use in automotive radar for improving driver safety and convenience, and imaging systems for security and medical. As the antenna is one of the key components in these mmWave applications, antenna design is required for each application. The feed network design is also one of the key technologies since the discontinuity of the feed network directly affects the performance of the antenna. In this dissertation, I designed mmWave antennas and feed networks connected from the monolithic microwave integrated circuit (MMIC) to the antenna. Designing antennas and feed networks in that band must be entirely dependent on electromagnetic simulations. Therefore, I proposed the procedure of validation of modeling and simulation for efficient and accurate simulation and preceded studies to verify it using several examples. Three simulators which are mainly used to analyze the three-dimensional (3D) electromagnetic (EM) model are utilized and the results were applied to design antennas and feed networks. Next, antennas for use in 5G mobile devices were proposed and experimentally verified. The double-sided flexible printed circuit (FPC) was folded to realize an aperture-coupled patch antenna, which reduces the cost of the process required for stacking. In addition, the feed line and the patch of the antenna were folded by 90° so that the antenna radiates in the end-fire direction. The above design method satisfied the low-cost, miniaturization and end-fire radiation. In addition, the performance was improved by adjusting the spacing between the radiation patch and the aperture at no additional cost. Finally, I designed the feed networks connected from the MMIC to the antenna. Since the 28-GHz MMIC cannot be obtained, it was replaced with the MMIC and antenna used in the automotive radar front-end module in the same mmWave band. The stack-up and the dielectric properties of the module to be designed were determined. Based on this, I designed transition structures to compensate the discontinuity and to measure the fabricated feed networks. A 9-channel jig was designed to measure multiple channels simultaneously. Designed feed networks were verified through both simulation and measurement.
more목차
1 Introduction 1
2 Validation of Computational Electromagnetics Computer Modeling and Simulations 6
2.1 Summary of IEEE Standard 1597.1 and 1597.2 8
2.2 Model Generation and Simulation 12
2.2.1 Thin Dipole Antenna 16
2.2.2 Circular Loop Antenna 24
2.2.3 Rectangular Cavity with Two Apertures 31
2.2.4 Monopole Antenna 38
2.3 Summary 44
3 Aperture Coupled Patch Antenna Fabricated on Folded Printed Circuit for 5G Mobile Devices 46
3.1 Antenna Design 46
3.2 Experimental Characterization 53
3.3 ACPA with Additional Layers 57
3.4 Summary 62
4 Feed Networks for 77-GHz Radar Front-end Module 65
4.1 Stack-up 65
4.2 Extraction of DK and DF 67
4.3 Thermal Analysis 70
4.4 77-GHz Interconnects 71
4.4.1 Wire-Bond Transition 71
4.4.2 Waveguide Transition 75
4.4.3 Nine-Channel Jig 81
4.4.4 End-to-end Feed Network Simulation 85
4.5 Module Characterization 87
4.6 Summary 91
5 Conclusions 92
Bibliography 93
Abstract in Korean 104
