modeled with appropriate lossy material properties.
This electrically large problem of 1333 λ × 1333 λ was
solved in ANSYS HFSS SBR+ in just 86 seconds on a
quad-core computer, requiring only 0.5 GB RAM.
A ;nal example shows the RCS of an Airbus 380 aircraft at 2.8 and 10 GHz, and the co-polarized and cross-polarized monostatic RCS responses are shown in
Figure 3. At 2.8 GHz, the 743 λ × 680 λ × 202 λ structure
was solved in two hours using 0.1 GB RAM. At 10 GHz,
the electrical size was 2,654 λ × 2,428 λ × 721 λ.
The addition of HFSS SBR+ solver to the portfolio
means HFSS users can extend the frequency range for
analyzing the radar signatures of their designs. The ;ow
is highly automated and tightly integrated into the same
Electronics Desktop as HFSS, meaning current users will
have an easy time adopting this new solver technology
into the simulation ;ow. HFSS SBR+ can be a key contributing tool in any design ;ow where stealth and radar
signature analysis of structures with large electrical size
and at very high frequencies is a critical performance
metric of the system.
cient solution, ANSYS HFSS SBR+ users can simulate
across many design variations to thoroughly study
and optimize the complex radar signatures of large
To illustrate, consider the RCS analysis of a missile
in ANSYS Electronics Desktop, shown in Figure 1. The
results show the monostatic RCS of a missile with an
electrical size of 385 λ × 70 λ × 70 λ, comparing the
monostatic RCS solutions obtained from the standard
SBR with results from the SBR solver with PTD and UTD.
The addition of the extended physics for SBR+ reveals
a larger response for the monostatic RCS in some regions, notably near the front of the missile. Even with
the extended physics applied, the simulations were fast
and extremely ef;cient. The standalone SBR simulation
required just nine minutes on a quad-core computer
with 0.075 GB RAM. As the results in Figure 1(c) indicate, advanced diffraction physics is important for accurate results at nose-on angles.
A second example shows the bistatic RCS of a
shipping vessel analyzed at 1 GHz with a plane wave
incident at θ = ;
45 degrees and φ = ;
(see Figure 2). The vessel was modeled in isolation,
then compared to a second simulation with a ;nite extent of sea water. To account for re;ections from the
water surface, a 400 m × 400 m seawater surface was