| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| 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.
|
