Krairiksh, Monai
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Krairiksh, Monai
Alternative Name
Krairiksh', Monai
Krairiksh, M.
Main Affiliation
Email
monai.kr@kmitl.ac.th
217 results
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Item type:Publication, Design 2.4/5.8 GHz microstrip-to-coplanar strip transition(2007-12-01); ; Chongcheawchamnan, MitchaiA 2.4/5.8 GHz microstrip (MS)-to-coplanar stripline (CFS) transition (industrial-scientific-medical bands) is presented in this paper. The transition can operate at two bands simultaneously with a stepped impedance transformer and stepped impedance open stub. The circuit is proven with a design on RF060 substrate. Simulated and experimental results of the transitions connected in back-to-back style are in good agreement. The back-to-back transition exhibits return and insertion losses, which are better than 15 dB and 3 dB, respectively. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An equivalent circuit of a bidirectional antenna using a probe excited rectangular ring(2004-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, EBG-backed ultrawideband circularly polarized Archimedean spiral antenna scheme for IoT applications(2025-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electromagnetic wave scattering on 2D PEC cylinders using complex source point techniques and uniform geometrical theory of diffraction(2010-07-30); An analysis of the path loss in the durian orchard is presented by using the complex source point technique (CSP) and the uniform geometrical theory of diffraction (UTD). The 2D Gaussian beams (GBs) expansion scattered by 2D cylindrical structures are presented. The GB can be generated by using the CSP. The GBs expansion can provides an efficient way of the synthesis of the radiation pattern of the antenna. The cylindrical structures are preliminarily assumed to be a perfect electric conductor (PEC). The source (square patch antenna) is located on a durian. The CST-program uses to simulate the source pattern including the effect of durian for the UTD calculation. The CSP-UTD is applied to analyze the scattered fields from the cylindrical structures. The multi-path propagation and the path loss prediction in various aspects are then obtained. Also, the exact solution of the CSP scattered by a cylindrical is used to compare the UTD results. The good agreements are obtained in this work. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple and Effective Design Concept for Constructing In-Situ Soil Dielectric Property Sensor with Dual Low-Cost COTS Microwave Modules(2022-01-01) - Some of the metrics are blocked by yourconsent settings
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Item type:Publication, Broadband Multi-Shaped Metasurface Circularly Polarized Antenna With Suppressed Non-CP Radiation Modes(2023-01-01); In this research, a multi-shaped metasurface broadband circularly polarized (CP) patch antenna with parasitic elements is proposed for 5G new radio (NR) applications. The proposed metasurface CP patch antenna comprises triple-layered substrates without air gap. The upper layer sits with multi-shaped metasurface elements and parasitic patches. The middle layer consists of an L-shaped slot functioning as the ground plane, and the lower layer contains a microstrip and a fan-shaped stub functioning as the feed line. The proposed metasurface CP patch antenna with parasitic elements is evaluated using characteristic mode analysis (CMA). The CMA results indicate that the modal significance of Modes 1 and 2 of the multi-shaped metasurface CP antenna are orthogonal, giving rise to circular polarization. The non-CP radiation of Modes 3 and 4 are suppressed by using the multi-shaped metasurface elements and parasitic patches. The measured impedance bandwidth and axial ratio bandwidth are 42.85% (3.4 - 4.9 GHz) and 38% (3.27 - 4.6 GHz), achieving the maximum gain of 7.23 dBic at 3.7 GHz. The experiments demonstrate that the multi-shaped metasurface CP patch antenna with parasitic elements is suitable for 5G NR wireless applications. The novelty of this study is attributed to its utilization of multi-shaped metasurface elements and parasitic patches, which effectively suppress non-circularly polarized radiation modes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A multibeam antenna using quasi-optical antenna-mixers(2008-06-02); A multibeam antenna could be designed without using a complicated feeding system by using quasi-optical antenna-mixers. Accurate beam directions could be obtained when practical antenna patterns was taken into account in the design. The effectiveness of a three-beam antenna is demonstrated at K-band showing accurate beam directions which is very useful in modern wireless communications. © 2007 Elsevier GmbH. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Beam-Scanning Reflectometer for Detecting Granulated Fruits(2017-03-01); The problem of granulation in fruits costs vendors a big chunk of their revenue, hence a non-destructive sensor that can identify granulated fruits without destroying good fruits is highly desirable. This paper presents such a sensor system based on beam-scanning reflectometer operating at 2.45 GHz. Beams of scattered waves from several directions around the fruit are reflected by a conical reflector and scanned by a phased array of pattern reconfigurable Yagi-Uda antennas equipped with 1-b phase shifters for lowest loss in feed network. The collected data are used to calculate the Rician k-factor. The system was tested with plasticine spheres and real tangerines. It was found that the system with an eight-beam array was better than one with a four-beam array. This system may prove useful for quality control of tangerines and other agricultural products. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Phased array of switched-beam elements and its applications(2009-12-01)This paper describes principle of a phased array of switched-beam elements (PASE). Variety of radiation patterns can be produced using four one-bit phase shifters and beam-switchable array elements. Some interesting applications of this antenna are illustrated. ©2009 IEEE.