I have designed a microstrip patch antenna with a resonant frequency of 28GHz and i would like to know what are the design methods to implement to increase its bandwidth and gain.
Dielectric Height
Impedance Matching
Patch Dimension
Feeding Technique (Probe feed might be better)
Permittivity
You should add a reflector to your antenna and optimize your design.
in addition to mentioned methods, adding slots, parasitic elements and also using metasurface can help you too.
If it is a single element do not to be changed, adding 4 horn-like flares as in the sketch attached would allow to get some extra gain likely up to 1-2 dB.
1- Using a substrate with low dielectric constant (big size) and thick can help to increase the bandwidth.
2- Using a substrate with high dielectric constant (small size)and thick can help to increase the bandwidth.
In both above cases the increase the thickens of microstrip to solve the bandwidth problem will caused surface waves and this waves will reduce the antenna gain, so we can used EBG to reduce this surface waves and improve the antenna performance ( gain, directivity, efficiency, and etc).
Hello,
There are so many methods to improve gain and bandwidth of a patch antenna. You can find them by searching different papers. Some basic properties are;
1. With increasing dielectric height antenna bandwidth increases, but gain decreases.
2. With increase in dielectric constant antenna bandwidth increases, but gain decreases.
3. with increase in effective patch edge length the antenna gain increases.
4. Better impedance matching, higher the gain.
So, u can modify patch, dielectric material, antenna height or impedance matching. But u have to optimize for best solution. Also there are so many additional methods also, like metal post to increase gain, as well as impedance matching, air via, parasitic patch etc. to improve the antenna performance.
Best Regards.
Anik Ghosh
You can use metamaterials as a substrate and as parasitic elements
(metamaterial cells) around your patch antennas.
Conference Paper Metamaterials on antenna solutions
Conference Paper Miniaturization of a Patch Antenna with Dispersive Double Ne...
You can use metamaterial structures to gain and bandwidth enhancement.
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