coupled on the right antenna element decreases substantially
and hence the mutual coupling at 4.6–8.5 GHz is reduced to less
than dB with little effect on the impedance matching.
The pair of open-ended slits etched on the ground are employed
to generate band-notched function. The notched band
can be controlled by adjusting the lengths of the slits. It is found
that the total length of each slit is taken as 8.6 mm ( ),
which is about a quarter of the guided wavelength at 5.5 GHz.
Therefore, a notched band of 5-5.9 GHz can be generated to reject
the 5.2/5.8-GHz WLAN operation.