I have a few queries about broadbanding a microstrip patch antenna:
1) Understanding intuitively the working of a microstrip with parasitic element. Varying the parameters like gap between the patch and parasitic element, dimensions of parasitic element can be done and results observed in CST but would like to know if one can understand without simulating say the effect of one of these parameters on the output. Or is this too complex to be manually interpreted?
2) Say for getting a broadband patch at 83 GHz what procedure should be followed. First design a patch at that frequency and then add a parasitic element and vary dimensions etc? Any opinion on the same would be very welcome.
3) Any relevant book/publication on the same.
Hi Arka,
you can also increase the bandwidth by increasing the substrate thickness.
Best regards
Mr. Boutayeb,
Thanks for the suggestion, I had considered that too but increasing the substrate height is not a possibilty in my example due to more surface wave excitation. Hence I am trying to consider and understand the parasitic element approach.
Dear Arka,
As you are working at higher frequency (83GHz), the size of the patch antenna will be smaller. Therefore, it better to introduce some kind of perturbation (such as slots), or use parasitic element, or use little bit lossy substrate material (gain will be low) or use Fractal geometry. At lower frequency, there are also some other techniques which are not applicable here. It would be better if you go through the works by K M Luk, (City University of Hong Kong). He has demonstrated several broad banding techniques.
.
Fractal shapes are a good choice for multi-band patch antenna. Also, The U slot inside the patch.
Partial grounds, fractal geometries, slots (U shape, L shape, etc....), will lead you broad bands.
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