High-Permittivity Substrate Multiresonant Antenna Inside Metallic Cover of Laptop Computer

This letter aims to describe a possible method of integrating an antenna inside the metallic cover of laptop computers. The proposed antenna consists of a patch and two parasitic monopoles on the high-permittivity substrate inside a 40 × 6 × 4 mm³ (0.36λ₀ × 0.054λ₀ × 0.036λ₀) cavity of the metallic cover. The -6-dB bandwidth of 2.62-2.81 GHz (7%) is achieved by combining multiple narrow bands from different resonant elements. A prototype of the proposed antenna is designed and measured to validate the design method. The obtained results including reflection coefficient, radiation pattern, and gain are presented and agree well with the simulation results.