Segmented Monopole Antenna Structure for Metal Roof Interference

The antenna structure is divided into multiple cylindrical sections with different radii along its length. This segmentation creates distinct regions that can be optimized for different functions: the lower section with larger radius provides structural stability and grounding, while the upper section with smaller radius optimizes radiation characteristics. The segmented structure helps isolate the antenna from the metal roof interference by creating electrical separation zones.

Different sections of the antenna are given different local properties through varying radii. The base section has a larger radius to provide mechanical stability and electrical grounding close to the metal roof, while the radiating section has a smaller, optimized radius to minimize interference effects. This local differentiation allows each part to perform its specific function optimally despite the presence of the metal roof.

The antenna is segmented into multiple cylindrical portions with different radii connected in sequence. This segmentation enables the antenna to support multiple resonant modes and operate across a broader frequency range. Each cylindrical section contributes to different frequency bands, collectively expanding the operational bandwidth while maintaining a relatively simple overall structure.

The radius parameter of the antenna is changed along its length, creating a non-uniform cylindrical structure. By varying the radius parameter from the base to the top, the antenna achieves impedance transformation and supports multiple resonant frequencies, thereby expanding bandwidth without requiring complex additional components.