The wideband microstrip patch anten

The wideband microstrip patch antenna element consists of
a square conductive patch atop a dielectric substrate with
relative dielectric constant r of 3.7 and loss tangent 0.002.
The height of the substrate (/4 at 2.1 GHz) broadens the
bandwidth of the antenna compared with patches built on
thinner substrates. Multiple feed probes are included to
reinforce the desired modal resonances and suppress unwanted
modal resonances. The feed probes are capacitatively coupled
to the patch antenna to mitigate their inductance and improve
their impedance match over wideband. The geometry of the
patch antenna is shown in Figure 1