shameemkabir said:Hi arsi15,
I took a look at your final.hfss design. There are some problems with the design I guess:
1. Air boundary: it's dimension should be at least quarter wavelength at all sides. For your case, you need to increase the z size to at least 50 mm (1.5 GHz design). Moreover, you didn't define the radiation boundary. define all faces of the airbox as radiation boundary except the bottom one. define it perfect electric.
2. Waveport: dimension of the waveport isn't correct. as far as I remember, width of the port would be around 5 times the microstrip line and height would be around 4 times the height of the substrate. Please take a look at the HFSS tutorial.
The substrate you used is one of the best for patch antenna design and very well known. Therefore, it is better to use this substrate for your design.
I would like to ask you one more question: How did you find the position to feed the patch? generally, you should feed at the position where the patch has 50 ohm impedance (Zo). Did you consider that? If not, please do so and as an example please take a look at the book of Banalnis (chapter 14).
REgards,
Shameem
cisconur said:one more question; why do we choose airbox λ/4 far away from every side , i thought i should only care radiation direction , but if it doesnt make any radiation to the sides , is that important?
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