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HFSS antenna imput impedance

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leomecma

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I need simulate an antenna in HFSS for RFID. The internal impedance of IC at 915MHz is 12.8-j248 (NXP UCODE7). This is a serie impedance.

To simulate this impedance I use a Lumped port with equivalent parallel resistance Rp ~ 4.837K and a capacitance of 0.7pF in parallel using a lumped RLC. Both in parallel connected to a dipole input.

Antenna needs be 12.8+j248 impedance for perfect match.

My question:

When I measure Z11 in HFSS, the real and imaginary part showed is parallel or serie modeled?

My doubt is because real part depends of the configuration.
 

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