Ports or feeds are the power source of the antenna, and it is important that we define such ports correctly.
For this reason we need to understand what kind of port we have, and make some additional geometry modifications accordingly.
Currently there are two types of lumped ports in CENOS:
- Uniform port
- Coaxial port
Antenna simulations do not require complex port geometries, and most connectors can be simplified to a single feed surface or simple connector assembly - it will make the meshing easier and calculation faster, while keeping the accuracy of the results!
Uniform port is essentially a rectangular surface, planar or curved, which is used in most planar antenna design simulations.
Uniform ports are widely used in PCB antennas, where the port connects the patch with the conductive layer (ground). In real antennas coaxial edge connectors are often used, but for simulation they are not necessary and you can replace them with simple planar ports.
To create planar feed:
- Create a sketch on the side and draw a uniform port on the edge of the patch, connecting the top conductive layer with the ground plane.
In addition to coaxial edge connectors, SMA connectors are commonly used in planar antennas. Again, the actual connector can be simplified to a curved port.
To create curved feed:
- Create a sketch on the patch and draw a circle of where the port will be.
Extrude the port through the patch.
Choose the patch and cylinder objects and click Cut boolean to create a hole in the patch.
Coaxial ports are ports where the connection surface is made by a coaxial cable. For these kind of ports you don't need to create a separate surface, as it is already included in the volume definition.
You can create a coaxial connector yourself or use one from the Component Library.
Coaxial ports can be simplified as well - replace the complex assembly with simple cylinders!