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Antenna Bandwidth

Marya2020

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Hello everyone! I want to design an antenna Array (4*4) for 28GHz with 3GHz bandwidth. I am wondering how much bandwidth I need for one element?
 

Georgy.Moshkin

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Depends on feeding network. You can achieve >3GHz for single element with magnetoelectric dipole antenna (me-dipole slot antenna) or aperture coupled patch antenna.
 

vfone

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Usually the array antenna bandwidth is not much greater than the bandwidth of a single antenna element.
Frequency bandwidth of an array is affected by many factors, as: change of element input impedances with frequency due to element coupling and due to beamsteering, by change of element spacing in wavelengths, and also by feeding structures used.
I think that for your bandwidth requirements a Vivaldi array would be a good option:
 

Georgy.Moshkin

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Vivaldi is good, but 2d feeding would be challenging.
 

Marya2020

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Depends on feeding network. You can achieve >3GHz for single element with magnetoelectric dipole antenna (me-dipole slot antenna) or aperture coupled patch antenna.
Thank you so much for your reply. I got 3.5Ghz bandwidth for one element. However, I am not sure is it enough or not?
 

Marya2020

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Usually the array antenna bandwidth is not much greater than the bandwidth of a single antenna element.
Frequency bandwidth of an array is affected by many factors, as: change of element input impedances with frequency due to element coupling and due to beamsteering, by change of element spacing in wavelengths, and also by feeding structures used.
I think that for your bandwidth requirements a Vivaldi array would be a good option:
thank you so much for your explanation and the Vivaldi paper. I studied it. It has a good bandwidth. However, I am trying to get a good bandwidth from aperture coupled feed patch antenna.
 

Georgy.Moshkin

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I think 3.5GHz may be enough at 28GHz for 4x4 corporate feeding with some microstrip t-junction optimizations. Google for wideband microstrip t junction / wideband corporate feed.
 

Marya2020

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I think 3.5GHz may be enough at 28GHz for 4x4 corporate feeding with some microstrip t-junction optimizations. Google for wideband microstrip t junction / wideband corporate feed.
OK, for sure! I really appreciate it.
 

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