Patent ID: 9030358
Filing Date: 2015-05-12
Classification: H01Q

Abstract:
1. A miniature multi-frequency antenna which is capable of transmitting and receiving radio frequency signals and is electrically connected to at least one signal feed line and at least one ground line, comprising: at least one dielectric substrate with a first planar surface and a second planar surface, wherein said first planar surface is opposite to said second planar surface; at least one signal electrode, disposed on said first planar surface of said substrate and electrically connected to said signal feed line, wherein said signal electrode comprises at least one first branch and at least one second branch, said first branch and said second branch are interconnected with each other, and said first branch and said second branch are disposed coplanarly on the same surface of said first planar surface of said substrate; and at least one ground electrode, disposed on said second planar surface of said substrate and electrically connected to said ground line, wherein said ground electrode is shaped to be partially overlapped with said first branch of said signal electrode wherein said ground electrode and said signal electrode do not have electrical connection such that at least one capacitor is established in between said signal electrode and said ground electrode; said first branch of said signal electrode, said ground electrode together with said capacitor form at least one loop antenna having at least one first resonant frequency; and said second branch of said signal electrode which does not overlap with said ground electrode form at least one planar-inverted-F antenna having at least one second resonant frequency, wherein the first resonant frequency is lower than the second resonant frequency.