Abstract: An antenna assembly is use in a telecommunication device having a first printed circuit board and a second printed circuit board disposed right below and facing the first printed circuit board. The antenna assembly includes: radiating metal strip having a main strip section for disposing on an upper surface of the first printed circuit board, a feeding strip section extending from the main strip section through a first through hole in the first printed circuit board toward the second printed circuit board, and a grounding strip section extending from the main strip section through a second through hole in the first printed circuit board toward the second printed circuit board. After assembly, the feeding and grounding strip sections tend toward an upper surface of the second printed circuit board.

Abstract: An antenna assembly includes a base board defining a grounding and dielectric domains, a ground metal layer fabricated on the grounding domain, a dielectric medium mounted on the dielectric domain, and having an upper surface and one lateral surface, a first metal strip including a wave-like strip section mounted on the upper surface of the dielectric medium, and a lateral strip section mounted on the lateral surface of the dielectric medium, and a second metal strip fabricated on the lateral surface of the dielectric medium and having a coupling end coupled electrically to the ground metal layer. After assembly, the first and second metal strips and the ground metal layer cooperatively form an oscillator by virtue of electromagnetic induction to posses a specific frequency range.

Abstract: One dual-band monopole antenna composed of a microwave substrate, radiation devices and transmission line is disclosed. The radiation device includes the central radiation body and two radiation arms. The central radiation body is used to generate one resonance mode, and the two radiation arms are used to generate another resonance mode. Thus, the dual-band monopole antenna is capable of operating at two different frequencies. In practical applications, radiation arms can be put symmetrically on two opposite sides and close to the central radiation body.