2015 Fiscal Year Final Research Report
Design of broadband antennas using Non-foster matching circuit and wideband CP antennas
Project/Area Number |
25420378
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Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Communication/Network engineering
|
Research Institution | Kumamoto University |
Principal Investigator |
|
Project Period (FY) |
2013-04-01 – 2016-03-31
|
Keywords | 広帯域アンテナ / 小形アンテナ / NIC / 円偏波 / UWB |
Outline of Final Research Achievements |
Two approaches on enhancing the bandwidth of antennas have been studied. First approach is waveguide antennas using L-shaped probe. Modifying the short wall, apertures, 3-dB axial ratio characteristics are improved and available CP azimuth rang e have been widened. And some metasurface projects regarding this have been carried out. This antenna almost cover the UWB high band with circular polarization. As a second approach, bandwidth of small antenna with backing conductor have been enhanced using negative impedance converter (NIC). In the UHF band, the -10-dB S11 characterictics are widened to 10 MHz from 1 MHz. In addition to this, some approach to control the coupling between transitors' terminal can show that it makes the available frequency move to higher at around 1 GHz.
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Free Research Field |
アンテナ工学
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