Hoang Quan

Bio: Hoang Quan is an academic researcher. The author has contributed to research in topics: Antenna rotator & Dipole antenna. The author has an hindex of 1, co-authored 1 publications receiving 11 citations.

Compact MIMO antenna with low mutual coupling using defected ground structure

Abstract: Defected Ground Structure (DGS) is a newly introduced revolutionary technique in the field of microstrip antenna to enhance the performance of antenna parameters as bandwidth. In this paper, a design of compact MIMO antenna using DGS is proposed. The antenna operates at 3.5 GHz for WiMax/LTE tablet applications. Compare to theoretical microstrip antenna design, the suggested MIMO antenna using a simple DGS shape has achieved not only an enlarged bandwidth but also more compact size. In addition, the mutual coupling between two antenna elements with close distance is low (less than −20dB) thanks to proper position in antenna ground as well as the fed method using.

Improving Characteristics of 28/38GHz MIMO Antenna for 5G Applications by Using Double-Side EBG Structure

Abstract: — Multiple Input Multiple Output (MIMO) antenna is expected to form a major technique of 5G communication to get a high channel capacity. However the antenna performance is degraded significantly because of mutual coupling between close elements in portable equipments. In this paper, a novel EBG structure for 28/38GHz dual-band MIMO antenna with its equivalent is proposed. Having round shape and double side design, the proposed double-side EBG (DS-EBG) structure is able to improve significantly both mutual coupling and gain without any decoupling structure between antenna elements. Thus the MIMO antenna gets compact size of 15.3x8.5x0.79mm with no distance between antenna elements from edge to edge. The antenna radiation efficiency is also refined at both bands. This improvement has not attained from any previous EBG structure studies. At 28GHz, the radiation efficiency is increased from 83.2% to 87.6% while it is raised from 83.1% to 91.1% at 38GHz. Besides, the antenna achieves wide bandwidth of 7.1% and 13.16% at 28GHz and 38GHz, respectively that is suitable for 5G terminals. All dimensions of EBG cell as well as antenna are optimized by using Computer Simulation Technology (CST) software.

Design of 2.4 GHz and 5.8 GHz Microstrip Antenna on Wi-Fi Network

Abstract: Wi-Fi (Wireless Fidelity) is one of the most popular wireless communication standards in the market. This technology is widely used both in offices, shopping centers, campuses and other public places. To optimize the Wi-Fi communication system antenna optimization is needed. The role of the antenna is to transmit voice communication and data communication. However, due to the influence of several factors, the signals received by users often experience instability. The design of the trident microstrip antenna aims to find the microstrip antenna formula needed by Wi-Fi technology. So, the research will design a trident microstrip antenna for Wi-Fi that works at 2.40 GHz and 5.80 GHz frequencies. The software needed to design this antenna is computer simulation technology (CST). From the simulation results for the 2.4 GHz trident microstrip antenna has a return loss value of -18,514 dB, a VSWR value of 1.26 dB and a Gain value of 4.71 dB. As for the simulation results of the 5.8 GHz microstrip antenna has a return loss value of -40,437 dB, a VSWR value of 1.02 dB and a Gain value of 4.19 dB. As for the measurement results of the 2.4 GHz trident microstrip antenna has a return loss value of -24,767 dB, a VSWR value of 1,122 dB and a Gain value of 3.24 dB. As for the measurement results of the 5.8 GHz microstrip antenna has a return loss value of -37,554 dB, a VSWR value of 1,027 dB and a Gain value of 3.57 dB. Where the overall results of simulations and measurements can be said 5.8 GHz microstrip antenna has good performance results for the parameters needed.

Design of dual band patch antenna with bandwidth enhancement using complementary defected ground structure

Abstract: A new and very simple way of implementing defected ground structure (DGS) in a microstrip patch antenna is presented. The dimension of DGS is exactly same as the dimension of radiating element. There are two different DGSs implemented in this paper. The DGSs are complement of each other with respect to their structures. The antennas with these complementary DGSs show four different frequencies of operation (10 GHz, 12 GHz, 16 GHz and 16.6 GHz) with enhanced bandwidth maximum of 22% with respect to the antenna without DGS. The proposed antenna can be implemented for X-band and Ku-band application.

Mutual Coupling Reduction of MIMO Antenna for Satellite Services and Radio Altimeter Applications

Abstract: Ground irregularities also known as defected ground structures (DGS) is a freshly presented innovatory way in designing of patch antennas to boost up the performance of antenna constraints. This study presents a novel proposal of ground irregularities or defected ground structure is proposed for suppression of mutual coupling effects among 2x1 multiple input multiple output patch array designed on Roggers Duroid 5880. The two adjacent M shape structures surrounding Dumbbell Shaped structure and sandwiched between Dumbbell shape patterns showed the significant level of surface wave suppression up to -42dB while maintaining the gain of 4.7dB and 5.6dBi of directivity. The patch array operates at 4 to 4.3GHz for Fixed and Radio satellite services (FSS) and (RSS) and radio altimeter application systems.