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Boundary conditions

Boundary conditions or Boundaries are very important part of the simulation, as they are needed to physically define your antenna design. Even though Boundaries are always filled automatically, in some occasions you will need to change or adjust the default definitions.

In this article we will go over the boundary conditions available in CENOS Antenna Design app and learn the meaning of each definition.

Uniform/Coaxial port#

This is the most important boundary, as it is responsible for the antenna feed definition.

CENOS will automatically set Uniform or Coaxial port depending on Role definition. Port Impedance by default is set to 50 Ohm, which you can adjust depending on your case.



Automatic Feed Parameters - Uniform#

Automatic Feed Parameters will be set by default. If you uncheck the selection, you will have access to the manual definitions of Feed Parameters.


Uniform Parameters:

  • Voltage [V] - Applied voltage to the feed;
  • Gap [m] - Inset gap (for patch antennas). If you don't have an inset, put 0;
  • Feed vector X, Y, Z - Vector parallel to the feed plane.

Automatic Feed Parameters - Coaxial#


Coaxial Parameters:

  • Voltage [V] - Applied voltage to the feed;
  • Inner radius [m] - Inner radius of the Coaxial port;
  • Outer radius [m] - Outer radius of the Coaxial port.

Phase shift#

By enabling the Phase Shift checkbox, you can define phase shift through which you can change the angle of excitation of the wave at the antenna input.


Perfect Electric Conductor#

Perfect Electric Conductor is a condition which is by default applied to wire of wire antenna or conductive layers of patch antenna (patch and ground). It assumes perfect electric conductivity of the boundary.



You can use Conductor boundary instead of Perfect Electric Conductor. Conductor takes into account the resistive losses, which can give more precise simulation results.


Radiation Boundary#

Radiation Boundary is by default applied to the outer surface of the air box - a domain which is automatically generated around your antenna.



Interface is used to define an internal contact surface between two separate domains.