Brillasoko
Newbie level 6
I am currently designing a patch antenna to operate at a resonant frequency of 312.5 MHz with coaxial probe center feeding. Using a 25mm air substrate, and using the design equations from Balanis' book, I obtain the length and width of the patch as 444.8mm and 480mm respectively. However, after designing and simulating the antenna in HFSS, the frequency shifts to around 560 MHz. It's only after re-designing the antenna for a frequency of 200 MHz that I get it operating at close to the 312.5 MHz mark. Can anyone kindly help me get to the bottom of this mystery, for I'm really baffled?