For example the band width of planar array antenna with 4 elements is the same of one element bandwidth, may be the problem in connection feeder lines ?
If you make all your feed lines the same length you should get the same bandwidth for four antennas as for one antenna, but microstrip feeds often miss out whole wavelengths which is ok at centre band but narrows the operating bandwidth of the array.
Either u can
1. Increase thickness of substrate
2. Decrease dielectric constant
3. Varying the array element distance
Dear Mr. saravanan thanks a lot for your answer , my design a cording to high dielectric constant and high substrate thickness and element distance proximate 0.5 wavelength
Increase in substrate thickness will perhaps solve the problem else check the feed lines ...
thanks dear Deosarkar shankar , already increased the substrate thickness
More bandwidth in the array compared to that of its single element could be only obtained if the array elements are coupled (even tightly coupled). This would require likely some redesigning the array, e.g. decreasing spacing between elements, placing superstrate on the top, etc.
Bandwidth enhancement is done by mutual coupling in array antenna between elements using scattering parameters instead of the mutual impedance. An approximate expression is derived for matched voltage standing wave ratio (VSWR) bandwidth of a tuned antenna, which reveals that the bandwidth is inversely proportional to the magnitude |Γ′0(𝜔0)| of the frequency derivative of the reflection coefficient.
Thanks,
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