One way to increase the BW would be varying the substrate height. There are a lot of other techniques such as incorporating with Metamaterial elements.

Hello,

For this, to effectively increase the bandwidth of a multiband antenna in HFSS, common strategies include: adding slots or cuts to the patch geometry, modifying the ground plane with slots or DGS (defective ground structures), increasing the substrate thickness, utilizing parasitic elements, implementing feeding techniques like L-shaped or T-shaped feeds, and incorporating metamaterial structures; all while carefully optimizing the antenna's geometry and material properties to achieve the desired multiband response.

Key strategies to consider:

• Slot loading:Create slots or cuts in the patch geometry to alter the resonant frequency and broaden the bandwidth. Experiment with different slot shapes and locations to fine-tune the multiband response.
• Ground plane modifications:Design DGS (defective ground structures) on the ground plane to manipulate the electromagnetic fields and enhance bandwidth. Explore different DGS shapes and sizes to achieve desired multiband characteristics.
• Substrate manipulation:Increase the thickness of the substrate to improve the antenna's impedance bandwidth. Consider using a substrate with a lower dielectric constant for wider bandwidth.
• Parasitic elements:Add parasitic patches or strips near the main patch to interact with the electromagnetic fields and broaden the bandwidth. Optimize the size, shape, and position of parasitic elements for optimal performance.
• Feeding techniques:Employ L-shaped, T-shaped, or other specialized feeding structures to improve impedance matching and bandwidth. Adjust the feeding point location to fine-tune the multiband response.
• Metamaterials:Incorporate metamaterial structures like split-ring resonators to manipulate electromagnetic waves and achieve wider bandwidth. Carefully design metamaterial elements to match the desired operating frequencies.

Important considerations when using HFSS:

• Parametric sweep:Use parametric studies to efficiently explore different design parameters and optimize the antenna for multiband operation.
• S-parameter analysis:Analyze the return loss (S11) to evaluate the impedance matching and identify resonant frequencies.
• Radiation pattern analysis:Examine the antenna's radiation patterns at different frequencies to ensure desired performance across the multiband range.

Thanks,

In order to enhance bandwidth of multi resonance, the resonating element pair has to be incorporated instead of single resonator

Creating slots in patch antennas to modify current distribution, adding parasitic elements, and utilizing metamaterial or Electromagnetic Band Gap (EBG) structures are effective methods for increasing bandwidth. Additionally, increasing the substrate thickness can also enhance bandwidth.