Design of compact High gain dipole Antenna

[Twave03]

Hi all!

A normal dipole has a gain of 1.6dBi..right ?

This stacked dipole has a a gain of 9dBi:

https://actility.thingpark.com/thingpark-store/lora-ecosystem/13-antenna-9dbi-868mhz.html

but its kinda big....

I want to design a compact high gain antenna with the use of meta material as described in this document:

https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.205.4840&rep=rep1&type=pdf

Does anyone has experience with this ?
Anyone who has acces to 3D simulation software ?

Thanks in advance!