Composite Antenna Device Gain Enhancement Miniaturization

The patent merges the AM/FM element and patch antenna into a closely integrated configuration where the AM/FM element is positioned directly over the patch antenna with minimal or no gap. The AM/FM element is designed with specific dimensional constraints (width ≤ 1/4 wavelength of patch antenna frequency, length ≤ 1/2 wavelength) and orientation (meander shape extending in longitudinal direction) to prevent harmful electromagnetic coupling while enabling compact integration, thus achieving both small device size and maintained patch antenna performance.

The patent employs a nested configuration where the AM/FM element is positioned directly over the patch antenna in a vertical stacking arrangement. The AM/FM element acts as a capacitive top load that extends the electrical length of the short vertical antenna element, enabling effective AM broadcast reception despite the height restriction. The meander shape of the AM/FM element in the longitudinal direction further increases the electrical length within a compact physical footprint, maintaining receiving sensitivity while complying with exterior fitting regulations.

The patent applies local quality by designing the AM/FM element with specific dimensional and orientational characteristics tailored to its position over the patch antenna. The width is constrained to ≤ 1/4 wavelength of the patch antenna frequency to minimize lateral electromagnetic coupling, while the length is constrained to ≤ 1/2 wavelength. The meander shape is oriented along the longitudinal direction of the patch antenna, creating a localized electromagnetic environment that protects the patch antenna characteristics while simplifying the overall layout design through standardized geometric constraints.