This paper proposes the 2.45 GHz planar Beam Steering Antenna Array for Indoor Positioning Systems. The antenna array consists of a phase shifter based on a 4 × 4 Butler matrix, and an array of four dipole Yagi antennas. By choosing one of four beams using a switching controller, the main beam of the antenna can steer in four directions from +37 • , −12 • , +12 • to −36 • . The antenna has a narrow fan beam with a beamwidth in the azimuth plane of from +21.5 • to +24.5 • and in the elevation plane of approximately 90 • which effectively minimizes multipath signals. These advantages are suitable for positioning systems to increase location accuracy. The antenna achieves a peak gain of from 9.1 to 9.8 dBi in four directions, a wide band of 400 M Hz. The fully electronically steerable antenna prototype has been designed using CST software, simulated based on the finite element method, and fabricated on the RO4003C substrate as well as measured. The antenna is implemented in the Indoor Positioning System using three different location methods, including trilateration, triangulation, and fingerprinting, to highlight the antenna's advantages in improving location accuracy with the ratio between the mean location error and area of 0.051, 0.033, and 0.023 respectively.
This paper depicts a wideband circularly polarized (CP) antenna for 5G devices. The antenna array has a 3D structure including four simple printed dipole elements with directional radiations, high gain, and high efficiency. It achieves a CP by using the sequential rotation (SR) feeding based on 90°-3dB hybrid couplers in the proposed feeding network. The antenna array bandwidth is wide, 26.7%, with an operating frequency band from 3.35 GHz to 4.35 GHz. The antenna achieves a high peak gain of 10.73 dBi and high efficiency of 93.75%. Besides, the antenna gain is stable over the operating bandwidth (BW). At the centre operating frequency of 3.75 GHz, the angle of circular polarization is 51°. The antenna is designed and fabricated on the Rogers 4003 C substrate. The measured S11 is well matching with the simulation results. With the above characteristics, the proposed antenna can be a suitable candidate for 5G devices.
Đánh giá của người tiêu dùng trực tuyến cung cấp một lượng thông tin chưa từng có để người tiêu dùng đánh giá dịch vụ trước khi mua hàng. Chúng tôi sử dụng lý thuyết kích thích-xử lý-hồi đáp SOR để điều tra ảnh hưởng của sự tiếp nhận thông tin trong bối cảnh truyền miệng điện tử (EWOM) lên hành vi đặt dịch vụ lưu trú trực tuyến (DVLT) và vai trò điều tiết của niềm tin EWOM trong việc dự đoán hành vi (HV) đặt DVLT của khách hàng (KH). Nghiên cứu sử dụng phân tích cấu trúc tuyến tính (SEM) với dữ liệu khảo sát 412 KH đặt DVLT trên các đại lý du lịch trực tuyến (OTA). Kết quả cho thấy rằng sự tiếp nhận EWOM có ảnh hưởng tích cực đến HV, thái độ khách hàng với OTA và thái độ KH với DVLT có vai trò trung gian trong mối tác động giữa sự tiếp nhận EWOM lên HV đặt DVLT của khách hàng (KH), niềm tin EWOM có tác động điều tiết mối quan hệ giữa sự tiếp nhận EWOM lên HV đặt DVLT của khách hàng (KH), từ đó nhấn mạnh vai trò của niềm tin trong bối cảnh dịch vụ trực tuyến.
This research aims to identify the importance of factors that influence customer intention of purchasing electronic air ticket (e-ticket). The research compares the difference in purchasing intentions based on e-ticketing between demographic groups of age, income, educational level, and online shopping experience. With the sample size of 295 travelers, the regression models and ANOVA tests are used to process and explain data. The research detects four components, namely, perceived system usefulness, perceived ease of use, perceived behavioral control, and security of transaction that influence the consumer intention to buy e-ticket. The paper then recommends managerial solutions to the development of an electronic ticketing system in particular and e-commerce in general.
The purposes of this study are: (i) to develop store personality measurement scale tailor-made for household and electronics store chains in Vietnam, an Asian transitional economy; and (ii) to exam-ine the degree of influence of each store personality dimensions on store loyalty. The scale development is conducted in two stages: item generation and item purification. The new scale is applied to a data survey of 268 shoppers in Ho Chi Minh City (a metropolitan city in southern Vietnam) by systematic sampling. Multivariate data analysis techniques, such as exploratory factor analysis and struc-tural equation modeling, are used to analyze the data. The results reveal that store personality measurement scale is structured into four dimensions: reliability, sophistication, economy, and enthusi-asm with 22 items as observed variables and store personality im-pacts on loyalty behavior mediated by attitudinal loyalty. Particu-larly, these four dimensions are found to be correlated significantly with attitudinal loyalty but not with loyalty behavior except for economy—reliability and sophistication have positive impacts, whereas economy and enthusiasm negatively relate to attitudinal loyalty. The findings help retail managers with effective positioning strategy. This paper is the first to design the scale for store personali-ty and to explore the impact of each dimensions of store personality on attitudinal and behavioral loyalty in Vietnam and in the special-ty-store-chain context.
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