Slot Loaded Circular Patch Antenna

Here a slot loaded circular patch antenna is considered to show how a pin fed patch antenna is simulated in FEKO.  It is shown in [1] that by loading a circular patch with a number of slots, the resonant frequency of the antenna can be decreased.  That is the required size for a certain resonant frequency is reduced.  Figure 1 shows the simulation model of such a slot loaded circular patch (pin feed in red) which reduces the resonant frequency from 7.7GHz to 5.17GHz.  The patch resides on a dielectric with ε_r = 2.6 which is modeled with a Green function layer.

Figure 1:  Simulation model of slot loaded circular patch antenna. Pin feed shown in red.

Figure 2 compares the reflection coefficient at the feed point of the slot loaded antenna to that of the unloaded circular patch. 

Figure 2:  Resonant frequencies of the slot loaded and unloaded antennas are compared.

As shown in [1] the resonant frequency is reduced substantially and also the -10dB bandwidth is reduced.

References