KMITL
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Item type:Publication, Analysis of microwave distribution for ready-to-cook fresh-cut asparagus packaging(2009-12-01)1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Microwave sensor response in relation to durian maturity(2009-12-01); 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An annular microstrip antenna with sectoral slots for RFID reader(2009-12-01); ; This paper presents an annular microstrip antenna with two sectoral slots fed by a coaxial probe on a square vertical ground plane. The proposed microstrip antenna can support the dual-band operation (UHF and microwave RFID bands). From the results, the antenna has the magnitude of S11 less than -10 dB along the bandwidth of 32 MHz (3.51%) for UHF band and 140 MHz (5.76%) for microwave band. The unidirectional beam can be achieved by the proposed microstrip antenna. The beamwidth in xz- and yz-planes is 82.8 and 89 degrees at the center frequency of 922.5 MHz and beamwidth in xz- and yz-planes is 39.8 and 28 degrees at the center frequency of 2.45 GHz, respectively. This antenna has efficiently high directivity for both bands. The simulation and measurement results are shown. ©2009 IEEE. - 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.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Path loss prediction in durian orchard using uniform geometrical theory of diffraction(2009-11-16); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, In-depth analysis of reciprocal periodic structures of transmission lines(2009-08-31); An in-depth analysis of lossless reciprocal periodic structures of transmission lines (TLs) is presented. Interestingly, it is found that periodic structures can provide both non-negative (NNCR) and negative characteristic resistances (NCR). In addition, the magnitude of the voltage reflection coefficient associated with an equivalent model of periodic structures terminated with passive loads can be less than or equal to unity for the NNCR case, and can exceed unity and even approach infinity for the NCR case. However, associated powers are still conserved for both cases. Furthermore, an alternative derivation based on shortand open-circuited terminations for determining characteristic impedances and propagation constant of equivalent TLs is also introduced. An example of finite periodic TL structures, providing both NNCR and NCR cases, with varying the number of unit cells is also given. In addition, implementation and measurement are set up to verify theoretical and simulated results. It is found that these results are reasonably in good agreement. © The Institution of Engineering and Technology 2009. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Erratum: A graphical tool for analysis and design of bi-characteristig- impedance transmission lines (Microwave Opt Technol Lett (2007) 49: (2368-2372))(2009-04-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design and application of microstrip parallel-coupled lines employing step-impedance transmission-line compensation(2009-04-01); Robertson, I. D.The application of step-impedance transmission lines (SITLs) to improving the directivity of parallel-coupled microstrip lines is presented. A simple design procedure for two configurations based on the SITL technique is given. The application of the technique is demonstrated practically with a design at 0.9GHz on an RF60 substrate. The directivities obtained from the measured results are improved by more than 6 and 30dB compared with the designed uncompensated coupler. The compensation technique is then applied to the design of a coupled-line resonator and bandpass filter for suppressing harmonic responses in these circuits. Experimental results show that the second harmonic in the filter response is suppressed by 30dB. © 2009 The Institution of Engineering and Technology.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A hybrid ring coupler quasi-optical antenna-mixer(2009-01-17); This paper proposes a hybrid ring coupler quasi-optical antenna-mixer for mitigating local oscillator retransmission. By demonstrating at K-band, the antenna element consists of back-to-back aperture coupled inverted square patch antenna to couple the RF signal at 18.8 GHz to the sigma port of a hybrid ring mixer while the LO signal at 17.5 GHz is coupled to the delta port. The HSCH-9101 Schottky diodes are used to transform the RF signal to the intermediate frequency signal at 1.3 GHz. The results show that the RF/LO isolation is better than 29 dB at 18.19 GHz, and the isotropic conversion loss of the down converted signal is better than 16 dB at 19.25 GHz. The application of the interest is an inverse measurement technique for dielectric property determination. © 2007 Elsevier GmbH. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A rhombic patch monopole antenna with modified minkowski fractal geometry for umts, wlan, and mobile wimax application(2009-01-01)