RF Module

New Functionality in Version 5.2a

Postprocessing Far-Field Variables for Bistatic Radar Cross Section

Postprocessing variables are added for the bistatic radar cross section (RCS) calculation. You can use these in far-field plots to visualize the radar cross section that is a measure of the size of a scatterer seen by a radar. The bistatic RCS variable bRCS3D describes the RCS measured through a transmitter and receiver that are located separately, and you can also plot monostatic RCS. For 2D models, you can model bistatic radar cross section per unit length with the operator bRCS2D.

The Application Library path for the example plotting the bistatic RCS is:

RF_Module/Verification_Examples/rcs_sphere

The Application Library path for the example plotting the monostatic RCS is:

RF_Module/Scattering_and_RCS/radar_cross_section

Two-Port Network Systems

The two-port network feature characterizes the response of a two-port network system, such as reflection and transmission, using S-parameters. Just like the lumped port feature, a two-port network can only be applied on boundaries that extend between two metallic boundaries — that is, boundaries where Perfect Electric Conductor, Impedance Boundary, or Transition Boundary conditions apply — separated by a distance much smaller than the wavelength. A pair of two-port network port subnodes are added by default to the two-port network node and are used to select boundaries corresponding to port 1 and port 2 in the S-parameter input, respectively.

Fast Modeling Approach for Bandpass Filter Type Devices

Two powerful simulation methods new to the RF Module have been implemented in existing Application Library examples for designing bandpass-filter-type high-Q devices. When designing RF devices using the finite element method (FEM) in the frequency domain, it is easy to encounter a situation requiring many frequency samples to describe the passband more accurately. The simulation time is directly proportional to the number of frequencies included during the simulation of a microwave device; the finer the frequency resolution the study settings use, the longer it takes to finish the simulation. The new asymptotic waveform evaluation (AWE) and Frequency-Domain Modal methods provide a simulation speed orders of magnitude faster than the conventional frequency sweeping.

The Application Library path for the example using the asymptotic waveform evaluation (AWE) method is:

RF_Module/Passive_devices/cylindrical_cavity_filter_evanescent

The Application Library path for the examples using the Frequency-Domain Modal method is:

RF_Module/Passive_devices/cascaded_cavity_filter

RF_Module/Passive_devices/coupled_line filter

RF_Module/Passive_devices/cpw_bandpass_filter