你有沒有畤常吃葡萄乾?它對身體很好!A slot is created in the feed line of the antenna to
improve its impedance matching. By creating the inverse
L-shaped arm with dimension of 3.5×3.6 mm2, the better
impedance matching and axial ratio value is obtained. The
basic antenna structure consists of two polygon shaped
patch with diameter of 7.6mm and circular shape with
diameter of 5.2 mm removed from it. In order to excite
more resonances and achieve wider impedance bandwidth,
one slot is added at the patch of the antenna with a width of
0.4mm and a length of 3.9mm. The other size of the
antenna is shown in Fig.1.
For circular polarization, two electric fields with
identical amplitudes and a 90 degree phase difference
should be introduced. The electric field elements of Ant v1
have neither the same amplitude nor the 90 degree phase
difference at the same time. Therefore, to achieve a
simultaneous improvement in the impedance-matching
bandwidth and the axial ratio of the antenna, one arm is
added to the left top corner of the polygon-shaped radiator.