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CPW-Fed Slot Antenna with Inset U-Strip Tuning Stub for Wideband
B. Purahong,P. Jearapradikul,T. Archevapanich,N. Anantrasirichai,O. Sangaroon 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The coplanar waveguide fed slot antenna with inset U-strip tuning stub is proposed for wideband applications. The antenna consists of rectangular slots with conductor tuning stub fed by CPW feed line. This antenna is design for match impedance with 50 ohm of characteristic impedance of transmission line. By adjusting dimension of inset U-strip tuning stub, the range of bandwidth can be achieved from 1.66 GHz to 7.22 GHz which can operate in WLAN (Wireless Local Area Network) according to IEEE 802.11 a/b/g standards and covered the WiMAX (Worldwide Interoperability for Microwave Access, IEEE 802.16e) and can operate for mobile GSM1800, GSM 1900. The characteristics of antenna are proposed and analyzed for instance input impedance, return loss, bandwidth, VSWR, and far field radiation patterns.
Prodi, A.,Purahong, W.,Tonti, S.,Salomoni, D.,Nipoti, P.,Covarelli, L.,Pisi, A. The Korean Society of Plant Pathology 2011 Plant Pathology Journal Vol.27 No.4
Chemotype composition of Fusarium graminearum strains, isolated from durum wheat kernels from naturally FHB infected fields in Northern and Central Italy, was investigated by multiplex PCR. The different climatic and environmental conditions of the two examined areas separated by the Apennines affected the composition of chemotypes. 15Ac-DON chemotype was predominant in both the sub areas. Nivalneol chemotype was more frequent in the warmer sub area.
A. Prodi,W. Purahong,S. Tonti,D. Salomoni,P. Nipoti,L. Covarelli,A. Pisi 한국식물병리학회 2011 Plant Pathology Journal Vol.27 No.4
Chemotype composition of Fusarium graminearum strains, isolated from durum wheat kernels from naturally FHB infected fields in Northern and Central Italy, was investigated by multiplex PCR. The different climatic and environmental conditions of the two examined areas separated by the Apennines affected the composition of chemotypes. 15Ac-DON chemotype was predominant in both the sub areas. Nivalneol chemotype was more frequent in the warmer sub area.
Buffer Technique for Reduce Overlap Short Time Fourier Transform Complexity
Somsin Thongkrairat,Boonchana Purahong,Vanvisa Chutchavong 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
Fast Fourier Transform (FFT) is a popular algorithm to convert data in the original domain to frequency domain. In several DSP application it used to convert continues segment of data call short-time Fourier transform (STFT) such as spectrogram oscilloscope. To compute FFT using radix-2 algorithm it take O(nlogn) complexity when n is sampling size for STFT in typical method it use radix-2 algorithm to compute each segment of data make it take O(Tnlogn) when T is time or segment number to calculate. To smooth and comprehensive of the output segment of input data have to divide with some overlap data. With the overlap data in calculating process of radix-2 FFT algorithm it produce some redundant data that can use for next calculation. This paper presents a method to reduce complexity of STFT with overlapped data in the segment. Purpose method can reduce complexity of STFT from O(Tnlogn) to minimum O(Tlogn) in case of sliding frame is 1 sampling.
Dynamic set point feedback control using steady state detection
Somsin Thongkrairat,Boonchana Purahong,Vanvisa Chutchavong 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
There are various of feedback control model such as PID, Fuzzy control. The purpose of feedback control model is to find best way to process output or feedback signal to be the input signal for control the system according to set point or input demand. Normally the set point has been given from outside of system or be fixed to constant it means there are other subsystem assign set point. The paper is research about how to change the set point using only feedback value for convenient purpose. We research about processing of feedback value to know when the system wants to change the set point. We designed algorithm to analyse feedback value about steady state for decide changing set point and implement this method in the real hardware by PID speed control using encoder and microcontroller for run our algorithm. At last we record statistic from microcontroller and analyses the result.
Inset Dual U-Strip Slot Antenna Fed by Microstrip Line for WLAN Applications
T. Archevapanich,J. Nakasuwan,B. Purahong,N. Anantrasirichai,O. Sangaroon 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the slot antenna fed by microstrip line with inset U-strip for dual frequency operates in WLAN applications. The rectangular slot antenna is proposed for comparison between with and without U-strip in slot antenna by using three configurations of slot antenna. This antenna is designed for dual frequency used in WLAN system coverage IEEE 802.11b/g (2.4-2.4835 GHz), IEEE 802.11j (4.90-5.091), IEEE 802.11a (5.15-5.35 GHz) and WiMAX of IEEE802.16d (5.7-5.9 GHz). The PCB-FR4 substrate with dielectric constant ( ε r) 4.5 of thickness 1.6 mm is chose for low cost. The simulation results of these slot antennas are analyzed by using Method of Moment (MoM) from IE3D Software. Finally, the result of bandwidth at low frequency and high frequency of the desirable antenna are 9.76% and 31.6% at frequency range 2.3-2.58 GHz and 4.76-6.34 GHz, respectively.