My design is rectangular dielectric resonator antenna please can someone help me with how to feed my antenna using aperture or microstrip line method because the result am getting so far are poor convergence
It's hard to say why you don't get acceptable simulation results from the information given above.
General design:
I suspect you use a substrate with a RDRA on top and a ground plane on the back. To feed the RDRA with a microstrip you place a metal stripline on top of the substrate, in the region of the RDRA, between substrate and RDRA. The stripline starts at the substrates corner and goes under the RDRA for a certain length. For a first design you can place the open end of the strip in the middle of the RDRA. Displacements in X and Y will result in different polarization.
Port definition:
You can use either waveport or lumped port at the substrate corner, where the stripine starts. I usually use a waveport with a PEC port cap in these cases. Be aware of the port sizing guidelines and take a look to the field distribution in the port plane. Furthermore, you can define an intregration line to give the dominant propagation mode. If you want to connect your antenna to a 50 Ohms coax cable be sure to pick the right microstrip size to match the chracteristic impedance (Z_0) of the port.
Boundary conditions:
For a first try you can use an airbox around your structure, which is lambda/4 away from any radiation surface. Then, define a radiation boundary on the faces of the airbox.
Simulation setup:
Set up you simulation analysis setup with a frequency to solve at. If needed you can add a frequency sweep to see the wideband behaviour of your antenna.
Port sizing guideline for microstrip line: http://hfss13.blogspot.de/2012/05/wave-port-sizing-guidelines.html
HELLO Adamu
In this video you find an example of dielectric resonator antenna using CST. I think the principle is the same. it can give you at least an idea about simulation parameters
https://www.youtube.com/watch?v=vEuVLTycLIc
thanks and B.regard
Excitation of a particular mode is very important to get desired results. It is hard to answer your question as you did not mention the dimensions and er of RDRA. Can you please upload your antenna geometry so that we can suggest appropriate solution.
Mr Sudipta Maity attached is my antenna for you appropriate solution thanks
I do have HFSS v13.0 at our institute. You are using v15. I think, I have seen some portion of your structure....before expecting any results just do some correction: 1) instead of applying rectangular shaped waveport, please use coaxial probe. Otherwise, the dimensions of rectangular waveport have high impact on results. I do use coaxial probe always. 2) Adjust the size of aperture and length of stub. Once I've also used the same dimensions for may case where I used coaxial probe fed excitation (I used er = 80 instead of er=37). I think, you are using R K. Mongias' paper (1997). This paper gives everying about the excitation of RDRA using different feeding mechanisms. Just apply these two points. I'm sure, you will get results. [ R. K. Mongia and A. Ittipiboon, “Theoretical and exper imental investigations on rectangular dielectric resonator antennas,” IEEE Trans. Antennas Propag., vol. 45, pp. 1348–1356, 1997 ]
The dimensions of the rectangular waveport should not influence the results if you follow the port sizing guidelines. If port size variation leads to varying results, the rectangle is either to small or misplaced.
If i use probe feed i dont experienced a poor convergenence of port resinement but if i used rectangular port i always get problem i dont know why.
It is correct that if we use 'port sizing guidelines' properly, we will always get proper results. But as per my knowledge goes, we practically can not get such type of port. Therefore, (my opinion) It is always better to use ' what we have in practice '. Thats why, I always use coaxial probe instead of externally defined rectangular port.
- Badges
- Science topic