Abstract: An attenuator includes a main body and a circuit board module, wherein the main body is made of an electrically conducting metal, and an installing portion is concavely disposed between both ends of the main body, and a portion of the circuit board module is disposed on the installing portion for reducing the contact area between the circuit board module and the main body, so as to lower the parasite capacitance of the attenuator between the circuit board module and the main body, and the circuit board module processes a signal introduced by the main body according to a predetermined attenuation.

Abstract: The present invention is to provide to a planar multiple band omni radiation pattern antenna having first and second patch lines printed on a planar dielectric substrate material, wherein a plurality of radiation members are formed bifurcately, symmetrically along both sides of a longitudinal axis of either patch line. Each of the radiation members comprises at least two post-shaped conductors each having a length slightly less than one-quarter wavelength of a central frequency of each operating frequency so as to form a choke and the radiation members of multi-frequency, and enable the operating frequencies not to be harmonically related.

Abstract: The present invention is to provide to a planar multiple band omni radiation pattern antenna having first and second patch lines printed on a planar dielectric substrate material, wherein a plurality of radiation members are formed bifurcately, symmetrically along both sides of a longitudinal axis of either patch line. Each of the radiation members comprises at least two post-shaped conductors each having a length slightly less than one-quarter wavelength of a central frequency of each operating frequency so as to form a choke and the radiation members of multi-frequency, and enable the operating frequencies not to be harmonically related.