Hello, I am presently designing a 915MHz printed dipole that will be
directly connected to a transmitter chip (one arm is directly
connected to the RF pin and the other to the RF GND pin) all on the
same PCB. Since the dipole is not connected to a coaxial cable, do I
need a balun? Theoretically, I'm assuming I don't need one since the
input to the antenna and the input to the chip are both balanced. I
did some simulations with HFSS and I seem to be able to make my dipole
decently resonate at the frequency (S11 is about -7dB). So I assume I
don't need a balun, and I should be happy with the results. I'm just
not sure I should completely rely on the simulation results. I also
don't understand why S11 isn't lower at the resonant frequency.

Any feedback would be appreciated. I need to design this antenna by
Monday!

Thank you!