Dual polarized, high efficiency microstrip antenna
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Portable radio communication device with wide bandwidth and improved antenna radiation efficiency Patent #: 5936583
ApplicationNo. 255838 filed on 02/23/1999
US Classes:343/806, Bent arms (e.g., zigzag type)343/795Sheet or wing type
ExaminersPrimary: Wimer, Michael C.
Attorney, Agent or Firm
Foreign Patent References
International ClassH01Q 001/36
Foreign Application Priority Data1998-07-01 JP
AbstractAn antenna device includes radiation elements formed on a common antenna board, a feeding unit for feeding the radiation elements, and a ground plate provided in electrically-spaced relation to the radiation elements. The ground plate is mounted on a box-like metal body to form a short-circuit therewith. The radiation elements may have different line lengths for transmitting and receiving a plurality of wavelengths. The feeding unit may include a first radiation element having a different electrical length than a second radiation element, a first feed point for feeding electric power to the first radiation element, and a second feed point for feeding radiation elements are grounded to the ground plate at respective first and second ground points. The difference from the first and second feed points to their respective ground points are different from one another. The antenna device may have a value equal to (H)÷(Λ), where (H) is the distance between the radiation elements and the ground plate, and (Λ) is a wavelength of at least one frequency transmitted or received by the antenna device, and the distance H satisfies a relationship of 1÷250ࣘ(H)÷(Λ)ࣘ1÷100.