Faculty Profiles - SANAGI Minoru

Papers - SANAGI Minoru

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Efficiency and harmonics generation in microwave to DC conversion circuits of half-wave and full-wave rectifier types Reviewed

Shohei Imai, Shoichi Tamaru, Kazuhiro Fujimori, Minoru Sanagi, Shigeji Nogi

2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2011 - Proceedings 15 - 18 2011

Language：English Publishing type：Research paper (international conference proceedings)

A Rectifying Antenna (Rectenna) is one of the most important components for a wireless power transmission. It has been developed for many applications such as Space Solar Power System (SSPS), and Radio Frequency Identification (RFID) etc. The Rectenna consisting of RF-DC conversion circuits and receiving antennas needs to be designed for high conversion efficiency to achieve efficient power transmission. we try to design the mw-Class RF-DC conversion circuit using half-and full-wave rectification. The measured conversion efficiencies is 59.3 % and 65.3 % athalf- and full-wave type, respectively. And the full-wave type has lower 2nd harmonic reflection coefficient. © 2011 IEEE.

DOI： 10.1109/IMWS.2011.5877081

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Injection signal controlled active phased arrays without mode jumps Reviewed

Minoru Sanagi, Kazuhiro Fujimori, Shigeji Nogi

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 90 ( 4 ) 34 - 45 2007

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

An examination is made of phased array operation, by injecting signals with different phases into both ends of a coupled microwave oscillator system and controlling that phase, as a system for an active phased array antenna using frequency locking. This system has multiple operating modes, but by causing a slight deviation of only the free-running frequency of the end oscillator from the frequency of the injection signal, mode jumps can be suppressed and the phase difference between the oscillators made large. The effectiveness of this method can be numerically confirmed by finding the conditions for single mode operation with an approximation analysis of the governing equation. Using an active integrated antenna constructed of a patch antenna and serial-feedback FET oscillators, an experiment was performed by scanning the radiation beams of two-, three-, and five-element antenna arrays to demonstrate that the scan range in the radiation direction was extended with single mode operation. (C) 2007 Wiley Periodicals, Inc.

DOI： 10.1002/ecjb.20293

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FDTD Analysis Considered Undesirable Radiation of RF-DC Conversion Circuit for Microwave Power Transmission System Reviewed

Kazuhiro FUJIMORI, Tatsuya TAKAGAKI, Tsunayuki YAMAMOTO, Minoru SANAGI, Shigeji NOGI

2006 Korea-Japan Joint Conference on AP/EMCJ/EMT Proceedings P-AP-29 149 - 152 2006.9

Active phased array antenna radiating second harmonic output wave Reviewed

M Sanagi, K Yano, K Fujimori, S Nogi

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 89 ( 4 ) 39 - 50 2006

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

In order to make the scanned radiation beam range wider, phased array operation of an active antenna radiating the second harmonic is studied. By numerical analysis of a coupled oscillator system modeling file active antenna array, it is shown that the variation of the phase difference of the second harmonic component between the oscillators reaches 2 pi when the oscillators are coupled only by the fundamental components. This value is twice that yielding the fundamental component. Through experiments using two- and four-element arrays, the results of the analysis are confirmed. The radiation beam of the second harmonic is successfully scanned in a wider range than that for the fundamental component. (c) 2006 Wiley Periodicals, Inc.

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Special section on recent technologies of microwave and millimeter-wave devices focusing on miniaturization and advancement in performance with their applications Reviewed

Kawai T, Li K, Ma Z, Sanada A, Sanagi M, Takayama Y, Wada K, Nikawa Y

IEICE Transactions on Electronics E88-C ( 7 ) 1351 2005

Chain power divider/combiner with microstrip line probes inserted into a rectangular waveguide Reviewed

M Sanagi, S Ekuni, K Fujimori, S Nogi

PROCEEDINGS OF THE 2004 CHINA-JAPAN JOINT MEETING ON MICROWAVES 41 - 44 2004

Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings) Publisher：HARBIN INSTITUTE TECHNOLOGY PUBLISHERS

Multiple-way power divider/combiner's with a rectangular waveguide port for input/output signal and microstrip line ports for output/input signals are presented. A number of dividing/combining units are successively connected in the chain structure. The unit is composed of the rectangular waveguide section with the microstrip-line probe pair and the thin narrow section. Using as the divider, the chain structure has wideband performance due to the traveling-wave opeartion. High isolation between the paired ports in the unit is established by connecting the paired microstrip lines via a chip resistor. The four-way divider/combiner operating at X-band is designed. The broadband characteristics and. high isolations among the furcated ports are confirmed by the prototype divider/combiner.

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Spatial power combining of cicularly polarized active antennas Reviewed

NOGI S.

IEEE AP-S Int. Symp. Digest. Vol.1,pp.470-473 470 - 473 1998

Phased array behavior of circularly polarized active antennas Reviewed

KAGAWA T.

APMC Proc. Vol.2,pp.707-710 707 - 710 1998

Phased-array behavior of a one-dimensional mutually coupled oscillator system controlled by injection signals Reviewed

T Kagawa, S Nogi, M Sanagi, K Fukui

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 80 ( 2 ) 45 - 56 1997.2

Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

The system configuration, fundamental operation, and PSK modulation of the output wave are discussed for the phased array operation of a mutually coupled one-dimensional oscillator array when signals with different phases are injected at the two ends to make use of the mutual locking and injection locking phenomena. First, the equivalent circuit is analyzed and the condition of phased array operation is derived. It is shown that both the desired mode, appropriate for the phased array operation, and other modes exist. It is demonstrated that injecting the injection signal at the center of the array is effective in enhancing the stability of the desired mode. The transient response of the array is analyzed when a PSK signal is used as the injection signal. A possible means of obtaining a PSK modulated wave as the output is presented. An experiment in the X band, using waveguide oscillators and an active patch antenna array is described. The results are close to the theoretical predictions. (C) 1997 Scripta Technica, Inc.

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FDTD analysis for coaxial probe inserted into a waveguide Reviewed

A Sanada, M Sanagi, S Nogi, K Yamane

1997 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS, VOLS I-III 3 957 - 960 1997

Language：English Publishing type：Research paper (international conference proceedings) Publisher：CITY UNIVERSITY HONG KONG

Full wave FD-TD analysis has been carried out for coaxial probe inserted into a waveguide so as to achieve coaxial-waveguide transition. Including cases for probes with large diameter and extension length, equivalent admittances agreed well with corresponding measured results and have been provided as useful data for circuit design. Field concentration which ought to be taken into account for high power application design has been also discussed by field distribution.

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Other Link： http://orcid.org/0000-0003-2642-5296

Axially symmetrical Fabry-Perot oscillator with multiple devices inserted in dielectric substrate Reviewed

M Sanagi, T Itoga, S Nogi

1997 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS, VOLS I-III 337 - 340 1997

Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings) Publisher：CITY UNIVERSITY HONG KONG

We investigate an axially symmetrical Fabry-Perot oscillator with active devices inserted in a dielectric substrate for power combining of many more devices in microwave and millimeter wave frequency range. Empirically in this oscillator, efficient power combining can be done when it oscillates approximately at the frequency which corresponds to the wavelength equal to twice the spacing between devices. The wavelength in tile dielectric is shorter than in free space, so we tried to insert tile devices in the dielectric substrate in order to increase the number of the devices. By measuring the oscillation frequency of the oscillator with sixteen devices at X-band, we confirmed that the spacing between devices was about a half wavelength in the dielectric. We achieved almost perfect power combining of sixteen devices.

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Injection signal controlled active phased array with a frequency shifted end element Reviewed

S Nogi, M Sanagi, M Sono, F Miyake

1997 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS, VOLS I-III 953 - 956 1997

Language：English Publishing type：Research paper (international conference proceedings) Publisher：CITY UNIVERSITY HONG KONG

In order to realize useful active phased array antennas, we have investigated the phased array behavior of a microwave coupled oscillator system which has locking sources at both ends and is controlled by the phases of the injection signals. By numerical analysis, we show that free-running frequency shift of the end oscillator of the array is effective for enlarging the scanning range of the radiated beam. An experiment on a system of waveguide type oscillators has confirmed the analytical result and rye have successfully scanned the wave radiated from an array with five active patch antennas mounted with Gunn diodes.

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Transmission line coupled active microstrip antennas for phased arrays Reviewed

R Ispir, S Nogi, M Sanagi, K Fukui

1996 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 931 - 934 1996

Axially symmetric fabry-perot power combiner with active devices mounted on both the mirrors Reviewed

M Sanagi, E Yamamoto, S Nogi

1996 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 1259 - 1262 1996

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