In a substrate when the X band antenna elements and s band elements are placed but the ground plane is defected there is a big slot in the common ground plane.
Can it be said as an shared aperture antenna?
As a preliminary answer, I can say YES. For a better understanding of your design, I need a picture of your antenna assembly.
Vadym Slyusar sir i had attached the pictures for your reference
Dear Abishek Senthilkumar , as I understanted you have two different antennas: the patch-antenna in position 1 (please see attached picture) and the antenna array in position No.2. In the strong sense in this case you have a not-shared aperture antenna. The shared aperture will be in the other case, which I depicted on the 2nd picture with two antenna arrays. As next example of shared aperture antennas, you can see the fig. 7 of this my publication:
Conference Paper Pyramidal design of nanoantenna arrays
Fig. 7 was depicted the combination of Uda-Yagy nanoantenna arrays and 4 path antennas of lower frequency.
But, on the other hand, your case can be considered as a particular case of 2nd picture, and in your case, you have a common substrate and the common ground plane. In this regard, the mutual coupling between your patch antenna and antenna array in your case gives as results the design with one active antenna and one passive element. With a certain degree of conventionality, we can assume that your antenna system is a limited case of Shared aperture antenna.
Vadym Slyusar Sir I referred a paper in which X and C band elements are placed separately but in one substrate it is called as a Shared Aperture antenna in the same way i placed s and x band elements separately but in one substrate then my design can be called as a shared aperture antenna ?. I am having doubt like the ground plane in between the x and s band is slotted so whether it can be called as a shared aperture antenna.
I am attaching the paper which i referred for reference you can see fig 22 to get an idea by seeing it can you help me to solve my doubt whether i had interpreted correctly.
Thank you sir for your previous replies
Dear Abishek Senthilkumar thank you for the link to the article. In the context of my previous answer and with taking into account referred paper I think that you can say about Shared aperture antenna as well. A big slot in the common ground plane is not an important factor for the identification of Shared aperture. The main indicator, in this case, is the common substrate.
@Vadym Slyusar Sir I have an another doubt what is the difference between Shared Aperture Antenna and Dual Band Antenna?
Your antenna is not a shared aperture antenna because the reactive near-fields of the two antennas do not overlap, nor do they interleave each other. The reactive near-field can often be considered to be the same as the aperture of an antenna.
Also, the lower frequency antenna radiates to both sides of the ground, while the higher frequency antenna only radiates to one side of the ground.
It is not a defected ground plane, it is two separate ground planes.
Dear @Abishek-Senthilkumar, regarding difference between Shared Aperture Antenna and Dual Band Antenna you can read on this link
https://www.researchgate.net/post/What_is_the_difference_between_a_shared_aperture_antenna_and_a_dual_band_antenna
In my opinion, Shared Aperture Antenna and Dual Band Antenna in is not comparable terms. "Shared Aperture Antenna" term describes the geometry and construction of antennas and "Dual Band Antenna" describes frequency characteristics of antennas.
Dual Band can have an antenna with one aperture. As an example, you can see Marquee type dual-band dielectric resonator antenna for radar and communication applications, which was published in these papers:
Chapter Marquee type dual-band dielectric resonator antenna for rada...
Conference Paper Колёсные антенны MIMO для роверов
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