Radiated Power

Radiated power is the amount of time-averaged power (in watts) exiting a radiating antenna structure through a radiation boundary.

For a general radiating structure in HFSS, radiated power is computed as

(1)

where

• P_rad is the radiated power in watts.
• Âis the real part of a complex number.
• s represents the radiation boundary surfaces.
• E is the electric field.
• H^* is the conjugate of the magnetic field.
• ds is the local radiation-boundary unit normal directed out of the 3D model.
  Note:

  The accuracy of the computed radiated power depends on the accuracy of E and H. In some cases it is possible that the computed radiated power may deviate slightly from the actual radiated power.

The accuracy of the computed radiated power depends on the accuracy of E and H on the absorbing boundary. In some cases it is possible that the computed radiated power may deviate slightly from the actual radiated power. To increase the accuracy of the radiated power, seed the mesh on the absorbing boundary.

As a default behavior for SBR+ design and SBR+ hybrid design, an additional SBR+ power loss is subtracted from the total radiated power. For each source i, the SBR+ power loss L_iover all other sources j is computed as

where

• ℜ is the real part of a complex number

• S_ji is the S parameter from SBR+. When source i and j come from the same component instance, S_ji includes only scatter component. Otherwise,S_ji includes both scatter and incident components.

• a_i is the scaling factors specified in Edit Source.

• is the conjugate of b_j.

• P_i is port characteristic matrix