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Circularly Polarized Electromagnetic Band Gap Patch-Slot Antenna with Circular Offset Slot
Hajlaoui, El Amjed The Korea Institute of Information and Commucation 2018 Journal of information and communication convergen Vol.16 No.3
This paper reveals the impact of the insertion of electromagnetic band gap (EBG) structures on the performance of circularly polarized (CP) patch-slot antenna with offset slot. Several optimizations are necessary to precise physical parameters in the aim to fix the resonance frequency at 3.2 GHz. The proposed antenna possesses lightweight, simplicity, low cost, and circular polarization ensured by two feeding sources to permit right-hand and left-hand circular polarization process (RHCP and LHCP). The measured results compared with simulation results of the proposed circularly polarized EBG antenna with offset slot show good band operations with –10 dB impedance bandwidths of 9.1% and 36.2% centered at 3.2 GHz, which cover weather radar, surface ship radar, and some communications satellites bands. Our investigation will confirm the simulation and experimental results of the EBG antenna involving new EBG structures.
KWON, Jong Hwa,YOOK, Jong Gwan The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.7
<P>In this paper, a novel method of partially placing electromagnetic band-gap (EBG) unit cells on both the power and ground planes in multi-layer PCBs and packages is proposed; it can not only sufficiently eliminate simultaneous switching noise (SSN), but also prevent severe degradation of signal quality in high-speed systems with imperfect reference planes resulting from the perforated structures of uni-planar EBG unit cells. On the assumption that the noise sources and noise-sensitive devices exist only in specific areas, the proposed method partially arranges the EBG unit cells on both the power and ground planes, but only around the critical areas. The SSN suppression performance of the proposed structure is verified by a simulation and measurements.</P>
GBN/SSN 억제를 위한 이종 셀 EBG 구조를 갖는 전원면
김동엽,주성호,이해영,Kim, Dong-Yeop,Joo, Sung-Ho,Lee, Hai-Young 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.2
본 논문에서는 넓은 영역에서 GBN/SSN 억제 특성을 보이는 이종 셀 EBG 구조를 이용한 새로운 전원면 구조를 제안하였다. 제안된 구조는 -30 dB 이하의 삽입 손실로 정의되는 저지 대역이 GBN의 에너지가 집중적으로 분포하는 수 백 MHz에서 시작하며 약 7.9 GHz의 넓은 대역폭을 갖는다. 본 구조의 특징은 인덕턴스를 강화하는 나선형 연결 선로와 분산적 LC 회로의 주기를 줄이는 이종 셀을 추가한 것이다. 그 결과 -30 dB 저지 대역의 저주파에서의 차단 주파수가 낮아짐은 물론 대역폭이 넓어진 특성을 보였다. 또한, 전원면과 접지면 사이의 구조적 공진 모드가 현격히 억제되었으며 평행판 도파관에 비해 낮은 EMI 특성을 보였다. In this paper, a novel power/ground plane using the hybrid-cell electromagnetic band-gap(EBG) structure is proposed for the wide-band suppression of the ground bound noise(GBN) or simultaneous switching noise(SSN). The -30 dB stopband of the proposed structure starts from a few hundred MHz where the GBN/SSN energy is dominant. The distinctive features of this new structure are the thin spiral strip line and hybrid-cells. They realize the enhanced inductance and the shorter period of the EBG lattice. As a result, the lower cut-off frequency and bandwidth of the -30 dB stopband becomes lower and wider, respectively. In addition, the proposed structure has smaller number of resonance modes between power/ground planes and performs a low EMI behavior compared with the reference board.
EBG 구조를 사용한 전자파 인체 흡수 차단 휴대폰 케이스
오도영(Doyoung Oh),유형석(Hyoungsuk Yoo) 대한전기학회 2015 전기학회논문지 Vol.64 No.1
This paper investigates the performance of phone case with different permittivities like plastic, urethane and silicone. Then, we put an electromagnetic band gap (EBG) structure in phone case to reduce the specific absorption rate (SAR). In order to design the phone case, a loop antenna for PCS 1900 band was used. The phone case consists of a hairpin-like EBG structure that is more compact than other EBG structures. The SEMCAD X fdtd simulation results showed that, this proposed phone case can reduce SAR by 13 - 30% at similar power that is radiated by the antenna. This phone case can be used in future to reduce the SAR from mobile phones.
Signal Integrity Analysis of High Speed Interconnects In PCB Embedded with EBG Structures
M. Sindhadevi,Malathi Kanagasabai,Henridass Arun,A. K. Shrivastav 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper brings out a novel method for reducing Near end and Far end Crosstalk using Electromagnetic Band Gap structures (EBG) in High Speed RF transmission lines. This work becomes useful in high speed closely spaced Printed Circuit Board (PCB) traces connected to multi core processors. By using this method, reduction of -40㏈ in Near-End Crosstalk (NEXT) and -60 ㏈ in Far End Crosstalk (FEXT) is achieved. The results are validated through experimental measurements. Time domain analysis is performed to validate the signal integrity property of coupled transmission lines.
Signal Integrity Analysis of High Speed Interconnects In PCB Embedded with EBG Structures
Sindhadevi, M.,Kanagasabai, Malathi,Arun, Henridass,Shrivastav, A. K. The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper brings out a novel method for reducing Near end and Far end Crosstalk using Electromagnetic Band Gap structures (EBG) in High Speed RF transmission lines. This work becomes useful in high speed closely spaced Printed Circuit Board (PCB) traces connected to multi core processors. By using this method, reduction of −40dB in Near-End Crosstalk (NEXT) and −60 dB in Far End Crosstalk (FEXT) is achieved. The results are validated through experimental measurements. Time domain analysis is performed to validate the signal integrity property of coupled transmission lines.