Antenna unit having a helical antenna as an antenna element
AssigneeMitsumi Electric Co., Ltd.
InventorsJunichi Noro, Akemi Kato
Life of this patent
Estimating the term…
Abstract
In an antenna unit (10) comprising a circuit board (11) having a principal surface (11a) and a back surface (11b) and an antenna element (12) mounted on the principal surface of the circuit board, a helical antenna having an axial direction extending in substantially parallel with the principal surface is used ad the antenna element (12). A shield cover (13) is added to the circuit board at the back surface (11b) so as to cover circuit elements (17) and shields the circuit elements arranged on the back surface of the circuit board. An output cable (14) is connected to the circuit elements inside the shield cover and is pulled out of the shield cover. The circuit elements include a low-noise amplifier (LNA) circuit (172).
Claims6
An antenna unit comprising:
- a circuit board on which circuit elements are mounted, said circuit board having a principal surface;
- and
- an antenna element mounted on the principal surface of said circuit board and connected to said circuit elements,
- wherein said antenna element comprises a four-phase helical antenna having an axial direction which extends in a direction substantially parallel with the principal surface of said circuit board, and
- wherein said four-phase helical antenna receives circular polarization and comprises a cylindrical member made of an insulator and four antenna leads wound around an outer peripheral surface of said cylindrical member in a helix fashion.
An antenna unit comprising:
- a circuit board having a principal surface and a back surface opposite to the principal surface;
- circuit elements arranged on the back surface of said circuit board;
- an antenna element mounted on the principal surface of said circuit board and connected to said circuit elements, said antenna element comprising a four-phase helical antenna having an axial direction which extends in a direction substantially parallel to the principal surface of said circuit board;
- and
- a shield cover, added to the back surface of said circuit board so as to cover said circuit elements, for shielding said circuit elements,
- wherein said four-phase helical antenna receives circular polarization and comprises a cylindrical member made of an insulator and four antenna leads wound around an outer peripheral surface of said cylindrical member in a helix fashion.
An antenna unit comprising:
- a circuit board having a principal surface and a back surface opposite to the principal surface;
- circuit elements arranged on the back surface of said circuit board;
- an antenna element mounted on the principal surface of said circuit board and connected to said circuit elements, said antenna element comprising a four-phase helical antenna having an axial direction which extends in a direction substantially parallel to the principal surface of said circuit board;
- a shield cover, added to the back surface of said circuit board so as to cover said circuit elements, for shielding said circuit elements;
- and
- an output cable connected to said circuit elements inside said shield cover, said output cable being pulled out of said shield cover,
- wherein said four-phase helical antenna receives circular polarization and comprises a cylindrical member made of an insulator and four antenna leads wound around an outer peripheral surface of said cylindrical member in a helix fashion.
Dependencies are inferred from the claim text.