The Experts below are selected from a list of 14601 Experts worldwide ranked by ideXlab platform
Satoru Kurokawa - One of the best experts on this subject based on the ideXlab platform.
-
microwave receiving system using electro absorption optical modulator for broadband horn Antenna calibration
IEEE Conference on Antenna Measurements & Applications, 2017Co-Authors: Satoru Kurokawa, Masanobu HiroseAbstract:We have already proposed a simple optical fiber link microwave measurement system using zero biased optical reflection type electro absorptive intensity modulator with microwave amplifier and optical fiber. Our proposed system can measure microwave signal using optical fiber up to 29 GHz. We show experimental results of S21 measurement for double ridged guide horn Antenna (DRGH) by our proposed optical link system up to 18 GHz. It is proved that our proposed optical system can be used to evaluate the Antenna Factor.
-
Antenna gain and phase center estimation for broadband Antenna using metal ground plane
International Symposium on Antennas and Propagation, 2017Co-Authors: Satoru Kurokawa, Michitaka Ameya, Masanobu Hirose, Sayaka MatsukawaAbstract:We have already proposed a single Antenna method for estimating an Antenna Factor of log-periodic dipole array Antenna at 10 m Antenna distance up to 1 GHz. In this paper, we apply our proposed single Antenna method for double ridged guide horn Antenna. For estimating the far field Antenna gain, we apply the Antenna phase center modified Friis transmission formula. We show the estimation results of far field Antenna gain of double ridged guide horn Antenna. Difference between the estimated gain using our proposed method and using 3-Antenna extrapolation method is less than 0.83 dB in the frequency range from 1 GHz to 6 GHz.
-
measurement uncertainty of far field Antenna Factor for biconical Antenna using amplitude center modified equation
URSI Asia-Pacific Radio Science Conference, 2016Co-Authors: Satoru Kurokawa, Michitaka Ameya, Masanobu Hirose, Yuanfeng SheAbstract:We have developed a far field free space Antenna Factor estimation method for broadband Antennas. Our using method determined the far field Antenna Factor using amplitude center modified Antenna Factor estimation equation. In this paper, we show a measurement uncertainty of biconical Antenna for electromagnetic interference measurement. Estimated expanded uncertainty (k = 2) of biconical Antenna was estimated to be from 0.14 dB to 0.34 dB over the frequency range from 30 MHz to 300 MHz.
-
measurement uncertainty of free space Antenna Factor for super broadband Antenna using amplitude center modified equation
Conference on Precision Electromagnetic Measurements, 2016Co-Authors: Satoru Kurokawa, Masanobu HiroseAbstract:We have developed a far field free space Antenna Factor estimation method for broadband Antennas. Our using method determined the far field Antenna Factor using amplitude center modified Antenna Factor estimation equation. The expanded uncertainty (k = 2) of super broadband Antenna was estimated to be from 0.15 dB to 0.5 dB over the frequency range from 30 MHz to 1000 MHz.
-
measurement and uncertainty analysis of free space Antenna Factors of a log periodic Antenna using time domain techniques
IEEE Transactions on Instrumentation and Measurement, 2009Co-Authors: Satoru Kurokawa, Masanobu Hirose, K KomiyamaAbstract:We have proposed a method for evaluating the free-space Antenna Factor of a log-periodic dipole Antenna (LPDA) with a time-domain technique. The proposed method is based on a time-domain analysis and a pulse-compression technique. The proposed method enables the direct wave to be isolated from reflected waves on the ground plane of an open-area test site (OATS) and evaluation of the free-space Antenna Factor. In a measurement, two LPDAs are held on masts at a height of 6 m above the ground and are separated by 10 m. The direct wave is separated using a Wiener filter obtained from frequency-domain data at 3 m Antenna separation. The proposed method can completely separate the direct wave from other waves from the ground plane of an OATS. The expanded uncertainty (k = 2) of LPDAs was estimated to be from 0.38 to 0.45 dB over the frequency range from 300 to 1000 MHz.
Masanobu Hirose - One of the best experts on this subject based on the ideXlab platform.
-
microwave receiving system using electro absorption optical modulator for broadband horn Antenna calibration
IEEE Conference on Antenna Measurements & Applications, 2017Co-Authors: Satoru Kurokawa, Masanobu HiroseAbstract:We have already proposed a simple optical fiber link microwave measurement system using zero biased optical reflection type electro absorptive intensity modulator with microwave amplifier and optical fiber. Our proposed system can measure microwave signal using optical fiber up to 29 GHz. We show experimental results of S21 measurement for double ridged guide horn Antenna (DRGH) by our proposed optical link system up to 18 GHz. It is proved that our proposed optical system can be used to evaluate the Antenna Factor.
-
Antenna gain and phase center estimation for broadband Antenna using metal ground plane
International Symposium on Antennas and Propagation, 2017Co-Authors: Satoru Kurokawa, Michitaka Ameya, Masanobu Hirose, Sayaka MatsukawaAbstract:We have already proposed a single Antenna method for estimating an Antenna Factor of log-periodic dipole array Antenna at 10 m Antenna distance up to 1 GHz. In this paper, we apply our proposed single Antenna method for double ridged guide horn Antenna. For estimating the far field Antenna gain, we apply the Antenna phase center modified Friis transmission formula. We show the estimation results of far field Antenna gain of double ridged guide horn Antenna. Difference between the estimated gain using our proposed method and using 3-Antenna extrapolation method is less than 0.83 dB in the frequency range from 1 GHz to 6 GHz.
-
measurement uncertainty of far field Antenna Factor for biconical Antenna using amplitude center modified equation
URSI Asia-Pacific Radio Science Conference, 2016Co-Authors: Satoru Kurokawa, Michitaka Ameya, Masanobu Hirose, Yuanfeng SheAbstract:We have developed a far field free space Antenna Factor estimation method for broadband Antennas. Our using method determined the far field Antenna Factor using amplitude center modified Antenna Factor estimation equation. In this paper, we show a measurement uncertainty of biconical Antenna for electromagnetic interference measurement. Estimated expanded uncertainty (k = 2) of biconical Antenna was estimated to be from 0.14 dB to 0.34 dB over the frequency range from 30 MHz to 300 MHz.
-
measurement uncertainty of free space Antenna Factor for super broadband Antenna using amplitude center modified equation
Conference on Precision Electromagnetic Measurements, 2016Co-Authors: Satoru Kurokawa, Masanobu HiroseAbstract:We have developed a far field free space Antenna Factor estimation method for broadband Antennas. Our using method determined the far field Antenna Factor using amplitude center modified Antenna Factor estimation equation. The expanded uncertainty (k = 2) of super broadband Antenna was estimated to be from 0.15 dB to 0.5 dB over the frequency range from 30 MHz to 1000 MHz.
-
measurement and uncertainty analysis of free space Antenna Factors of a log periodic Antenna using time domain techniques
IEEE Transactions on Instrumentation and Measurement, 2009Co-Authors: Satoru Kurokawa, Masanobu Hirose, K KomiyamaAbstract:We have proposed a method for evaluating the free-space Antenna Factor of a log-periodic dipole Antenna (LPDA) with a time-domain technique. The proposed method is based on a time-domain analysis and a pulse-compression technique. The proposed method enables the direct wave to be isolated from reflected waves on the ground plane of an open-area test site (OATS) and evaluation of the free-space Antenna Factor. In a measurement, two LPDAs are held on masts at a height of 6 m above the ground and are separated by 10 m. The direct wave is separated using a Wiener filter obtained from frequency-domain data at 3 m Antenna separation. The proposed method can completely separate the direct wave from other waves from the ground plane of an OATS. The expanded uncertainty (k = 2) of LPDAs was estimated to be from 0.38 to 0.45 dB over the frequency range from 300 to 1000 MHz.
Kazuo Shimada - One of the best experts on this subject based on the ideXlab platform.
-
free space Antenna Factor computation using time domain gating and deconvolution filter for site validation of fully anechoic rooms
IEEE Transactions on Electromagnetic Compatibility, 2018Co-Authors: Anoop Adhyapak, Zhong Chen, Kazuo ShimadaAbstract:An alternative method to compute the free-space Antenna Factor using time-domain transformation and deconvolution filter for pulse compression is proposed. The deconvolution filter helps in compressing the time-domain pulse to distinguish the direct wave from the reflected wave and help evaluate the free-space Antenna Factor for site validation of fully anechoic rooms. The Antenna pair of ETS-Lindgren Model 3110C and 3180C Antennas, simulated with numerical electromagnetics code, is subjected to the proposed method with deconvolution filter and Wiener filter. Based on the simulation results, the proposed method is implemented over the measured results of the Antenna pair and used for the site validation of a fully anechoic room. The free-space normalized site attenuation results of the fully anechoic room comply with the ±4 dB specification.
-
free space Antenna Factor computation using time domain gating and deconvolution filter for site validation of fully anechoic rooms
International Symposium on Electromagnetic Compatibility, 2017Co-Authors: Anoop Adhyapak, Zhong Chen, Kazuo ShimadaAbstract:An alternative method to compute the free space Antenna Factor using time domain transformation and deconvolution filter for pulse compression is proposed. The deconvolution filter helps in compressing the time domain pulse to distinguish the direct wave from the reflected wave and help evaluate the free space Antenna Factor for site validation of fully anechoic rooms. The Antenna pair of ETS-Lindgren Model 3110C and 3180C Antennas, simulated with NEC, is subjected to the proposed method with deconvolution filter and Wiener filter. The proposed method is implemented over the measured results of the Antenna pair and used for the site validation of a fully anechoic room, based on the simulation results. The Free Space Normalized Site Attenuation Results comply with the ±4 dB specification.
Valentino Trainotti - One of the best experts on this subject based on the ideXlab platform.
-
Electromagnetic Compatibility (EMC) Antenna Gain and Factor
IEEE Transactions on Electromagnetic Compatibility, 2017Co-Authors: Valentino TrainottiAbstract:A method for calculating and measuring Antenna gain and Factor over perfect ground is presented. The electromagnetic compatibility Antenna Factor is used to determine the spurious electric field of the device under evaluation. The radio link employed to calibrate the receiving Antenna gain and Factor will produce completely different values for the transmitting and receiving Antennas, and the principle of reciprocity does not hold true, in this particular case, even if both Antennas are identical.
-
Electromagnetic compatibility (EMC) Antenna gain and Factor
2016 IEEE Global Electromagnetic Compatibility Conference (GEMCCON), 2016Co-Authors: Valentino TrainottiAbstract:A method for calculating and measuring Antenna gain and Factor over perfect ground is presented. The EMC Antenna Factor is used to determine the spurious electric field of device under evaluation. The radio link employed to calibrate the receiving Antenna gain and Factor will produce completely different values for the transmitting and receiving Antennas, and the principle of reciprocity does not hold true, in this particular case, even if both Antennas are identical.
-
vertically polarized dipoles and monopoles directivity effective height and Antenna Factor
IEEE Transactions on Broadcasting, 2010Co-Authors: Valentino Trainotti, G FigueroaAbstract:The effective length (Le) of linear Antennas like dipoles and the effective height (He) of monopoles shorter than a wavelength are determined using a transmitting Hertz Dipole as a reference. Effective Receiving Area (AeR) has been calculated in the receiving mode and hence the Antenna Receiving Directivity (DR) or Gain (GR)) can be determined. From these calculations, it can be seen that the Received Power (WR) in a link between two dipole Antennas in free space or between two monopole Antennas over a perfect ground is of the same value in the far field region. As a result, the directivity or gain of the ideal dipole Antenna in free space has the same value in transmission and reception; but, a different value for monopole and dipole Antennas installed over a perfect ground plane. This result is fulfilled in the ideal as well as the real case where losses and mismatchings are involved.
Zhong Chen - One of the best experts on this subject based on the ideXlab platform.
-
free space Antenna Factor computation using time domain gating and deconvolution filter for site validation of fully anechoic rooms
IEEE Transactions on Electromagnetic Compatibility, 2018Co-Authors: Anoop Adhyapak, Zhong Chen, Kazuo ShimadaAbstract:An alternative method to compute the free-space Antenna Factor using time-domain transformation and deconvolution filter for pulse compression is proposed. The deconvolution filter helps in compressing the time-domain pulse to distinguish the direct wave from the reflected wave and help evaluate the free-space Antenna Factor for site validation of fully anechoic rooms. The Antenna pair of ETS-Lindgren Model 3110C and 3180C Antennas, simulated with numerical electromagnetics code, is subjected to the proposed method with deconvolution filter and Wiener filter. Based on the simulation results, the proposed method is implemented over the measured results of the Antenna pair and used for the site validation of a fully anechoic room. The free-space normalized site attenuation results of the fully anechoic room comply with the ±4 dB specification.
-
free space Antenna Factor computation using time domain gating and deconvolution filter for site validation of fully anechoic rooms
International Symposium on Electromagnetic Compatibility, 2017Co-Authors: Anoop Adhyapak, Zhong Chen, Kazuo ShimadaAbstract:An alternative method to compute the free space Antenna Factor using time domain transformation and deconvolution filter for pulse compression is proposed. The deconvolution filter helps in compressing the time domain pulse to distinguish the direct wave from the reflected wave and help evaluate the free space Antenna Factor for site validation of fully anechoic rooms. The Antenna pair of ETS-Lindgren Model 3110C and 3180C Antennas, simulated with NEC, is subjected to the proposed method with deconvolution filter and Wiener filter. The proposed method is implemented over the measured results of the Antenna pair and used for the site validation of a fully anechoic room, based on the simulation results. The Free Space Normalized Site Attenuation Results comply with the ±4 dB specification.
-
measurement of the Antenna Factor of diverse Antennas using a modified standard site method
International Symposium on Electromagnetic Compatibility, 1999Co-Authors: J Mclean, Zhong Chen, G Crook, Heinrich FoltzAbstract:The standard site method given in ANSI C63.5-1988 is a convenient, widely used technique for determining the Antenna Factors of EMC testing Antennas using open area test sites. The technique works well for dipoles and dipole-like Antennas including broadband biconical Antennas. However, for some types of Antennas including some log-periodic dipole arrays as well as some new types of compact, broadband radiators, this technique can result in significant measurement error as given since the gain and phase patterns of the Antennas are not taken into account. The method can give accurate results if it is modified to include both the gain and phase patterns of the Antennas. Here we describe this new technique and then demonstrate the effect it has on the accuracy of Antenna Factor measurements.