How do I design a conformal antenna that follows the shape of a curved surface?
Conformal Array Design
Conformal arrays differ fundamentally from planar arrays because the elements are not coplanar. In a planar array, all elements can contribute to a beam in any direction within the scan range. In a conformal (curved) array, only the elements on the 'visible' portion of the surface contribute to a beam in a given direction. Elements on the opposite side of the curved surface cannot contribute because the surface blocks their radiation.
| Parameter | Low Gain | Medium Gain | High Gain |
|---|---|---|---|
| Gain Range | 2-6 dBi | 6-15 dBi | 15-45 dBi |
| Beamwidth | 60-360° | 15-60° | 1-15° |
| Typical Types | Dipole, monopole, patch | Yagi, helical, horn | Parabolic, array, Cassegrain |
| Bandwidth | Narrow to wide | Moderate | Narrow to moderate |
| Complexity | Low | Medium | High |
Frequently Asked Questions
How many elements are active at once?
For a cylindrical array: approximately 120°-180° of the cylinder contributes to a beam in any direction. Elements on the back side are either turned off or used for other functions. The effective aperture is smaller than the total array area by a factor related to the curvature.
What element types work on curved surfaces?
Conformal-compatible elements: microstrip patches (can be bent on flexible substrates), cavity-backed slots (integrated into the structure), and printed dipoles. Waveguide slots work on metallic curved surfaces. Rigid elements (horns) are generally not suitable for conformal installation.
How do I simulate conformal arrays?
Full-wave simulation of conformal arrays is computationally expensive because the curved surface cannot be simplified with planar assumptions. Specialized tools (FEKO with PO/MoM hybridization, CST with FEM) handle conformal geometries efficiently. Element-by-element embedded pattern simulation followed by array factor synthesis provides good accuracy with manageable computation.