Md. Zulfiker. Mahmud,
Mohammad. Tariqul. Islam



An Irregular-ground Orientated Miniaturized Patch
Antenna for UWB Industrial  Applications




(1) The loss tangent of the FR4 laminate is stated as 0.0025
on page 2 and as 0.025 on page 5 of the same article.

(2) The sawtooth in the defected ground-plane is much smaller
than the wavelength. A current-distribution computation is
required as a proof that it has any effect on the performance
of the antenna.

(3) Figure 3 is unreadable and can not be reproduced in a
black-and-white magazine.

(4) The antenna does not have a balun or other structures to
stop currents on the outside surface of the coaxial feedline.
Therefore the latter acts as part of the antenna.

(5) Althouh the antenna is well matched at low frequencies,
its radiation efficiency is declared low. Neither dielectric
losses nor copper losses of the proposed structure can explain
this drop of efficiency at low frequencies.

(6) Co-polarization and cross-polarization are not defined, since
the desired polarization of the antenna is not defined either.


