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I need to know dielectric constant (relative permittivity) and Tan loss of a FR4 board at 2.45 GHz.

The specification of the manufacturer is as it is below:

Dielectric Constant:

  • Test method (IPC-TM-650): 2.5.5.2
  • Test condition: Etched/@1 MHz
  • Specification(IPC-4101C) <5.4
  • Typical value: 4.58

Loss Tanget: - Test method (IPC-TM-650): 2.5.5.2 - Test condition: Etched/@1 MHz - Specification(IPC-4101C) < 0.035 - Typical value: 0.022

I read on the Net that those values should be lower at higher frequencies. Is it possible to calculate/determine/predict those two values for 2.45 GHz?

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There are equations to calculate them. Look here: http://www.sigcon.com/Pubs/news/4_5.htm.

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