| 摘要 |
PURPOSE:To improve the antenna characteristic of the whole of a plane antenna by forming the plane antenna so that one pair of adjacent resonance sides and the other pair of adjacent resonance sides have resonance frequencies slightly separated from each other. CONSTITUTION:A plane antenna 14 is tetragonal to have four resonance sides 15 to 18, and the length of one pair of adjacent sides 15 and 16 is slightly shorter than that of the other pair of adjacent sides 17 and 18. The angle formed by two adjacent sides IS and 18 different by length is set to 90 deg., and cut parts 6 are formed off centers on these two sides 15 and 18, and feeders 4 and 5 for circular polarization are connected to these parts 6. Two shorter adjacent sides 15 and 16 resonate with a frequency slightly higher than the resonance frequency of the plane antenna 14, and two longer adjacent sides 17 and 18 resonate with a frequency slightly lower than the resonance frequency of the plane antenna 14. Thus, the characteristic of the antenna is made wide-band. |
