Hello, I need help to make arrays of dra antennas (2, 3 and 4 antennas) using the models in the file (Prueba23). I made the array (the file Prueba3) but the graphics go wrong and the gain is negative. I am working on ANSYS HFSS.
Hola, necesito ayuda para hacer arreglos de antenas dra (de 2, 3 y 4 antenas) usando los modelos del archivo (prueba23). Yo realice el arreglo (el archivo prueba3) pero las graficas me salen mal y la ganancia sale negativa. Estoy trabajando en ANSYS HFSS
It seems that a slot is needed on the ground plane to allow coupling between the DRA and feedline. Besides, since copper is used for the ground and microstrip line, I am not sure if the PEC boundary in the model is necessary. Its setting seems confusing, too. It covers the sidewalls of the DRA, which makes it not a so-called dielectric resonator. In Prueba3, it even covers the DRA elements completely.
Hi, thanks for your response. What happens is that the individual model (prueba23) was already given to me by my teacher and I have to start from that model. So according to what I understand, the shape of the model and the configuration of the boundaries are also wrong. I was testing another model (prueba16-1), like the one in the image (ModeloDRA), but I still get the negative gain. And then you could tell me how I should configure the boundaries in DRA arrays please.
a. The PEC boundary seems wrong. You have assigned copper as the material of the microstrip line and ground, so the PEC boundary can be removed. Please remove it and have a try.
b. Two slots in Fig. ModeloDRA (a) are needed. Please use subtract operation in Ansys EM HFSS to etch them on the ground. They have to penetrate the copper ground.
c. Tuning and optimization.
Here is a coarse example. Besides, it might not be a good idea to use FR4 as the substrate at 60 GHz. The loss is considerable.
Thank you very much, I will try your changes to see what happens
Excuse me another question, both slots must be lumped ports?
Dear Christopher Damián Terán
As Boyuan Ma said you have some errors in the main design for 1 element so forget about the array for now. I strongly propose you read some paper about the standard DRA and try to just replicate the design in any of this paper to be sure that you understand everything else you will lose a lot of time.
Here are the things you need to change
1- Remove the PEC surrounding the DRA as it should be dielectric
2- You must make a slot in the ground to couple the field to the resonator
3- It seems that the parameters are not designed at all, you need to estimate all of them carefully. In DRA papers, you can find the equations on how to calculate DRA parameters.
4- You need to use any online microstrip online calculator to be sure that your line is giving you 50 ohm, else no power will arrive to the antenna.
You can use this calculator
https://www.pasternack.com/t-calculator-microstrip.aspx
5- Replace the lumped port to a normal wave port as finally you will use coaxial so it should be wave port, lumped port for internal circuits such as IC or baluns. Attached is a photo to estimate its dimensions.
6- Adjust the airbox so it is lambdaa/4 from each side of antenna expect in the side of wave port it should touch it
7- the substrate and ground size should be much larger than the radiating element
8- You can just test at single freq, for now, to check the gain and then launch the freq sweep, and no need for all these hundreds of points, just 10 or 20 are enough.
9- Usually the hight of the DRA is around lambdaa/3 for fundamental mode TE111 or kambdaa/2 for TE113 or lambda for TE115 but your hight is so small.
10- To adjust the matching (S11), you can optimize 3 parameters, width, length of the slot and the length of the matching stub.
11- Try to parameterize everything not use numbers so you can study effects of each one.
Hello, thank you very much for your help. We have been researching equations for designing the DRA antenna and found two. I wanted to ask you if any of you know if these are suitable for high frequencies (60 GHz) and also if any microstrip calculator is suitable for high frequencies. Thanks
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