COMPACT ANTENNA SYSTEM

摘要

An antenna system for global navigation satellite systems includes a ground plane, an active antenna disposed above the ground plane, and a passive antenna disposed below the ground plane. The active antenna includes a conducting ring substantially parallel to the ground plane. A radiating conductor passes through substantially the center of the conducting ring; the ends of the radiating conductor are electrically connected to the conducting ring. An excitation pin is electrically connected to the radiating conductor. A set of reactive impedance elements is electrically connected between the conducting ring and the ground plane. The set of reactive impedance elements is disposed substantially orthogonal to the ground plane. The passive antenna is similar to the active antenna, except the passive antenna does not have an excitation pin. The antenna system effectively suppresses multipath reception, and its compact size and light weight make it suitable for integration with a surveying pole.

主权项

1. An antenna system having an antenna axis, the antenna system comprising:
a substantially flat ground plane having a first surface, a second surface, a perimeter, and a normal axis, wherein the normal axis is substantially coincident with the antenna axis; an active antenna comprising:
a first conducting ring, wherein:
the first conducting ring is substantially parallel to the first surface;the first conducting ring is spaced apart from the first surface; andthe first conducting ring has a first center, wherein the first center is disposed substantially on the antenna axis;a first radiating conductor having a first end and a second end, wherein:
the first end is electrically connected to a first point on the first conducting ring;the second end is electrically connected to a second point on the first conducting ring; andthe first radiating conductor passes through substantially the first center;an excitation pin electrically connected to the first radiating conductor; anda first set of reactive impedance elements, wherein, for each reactive impedance element in the first set of reactive impedance elements:
the reactive impedance element is substantially parallel to the antenna axis;the reactive impedance element has a first termination and a second termination;the first termination is electrically connected to the first conducting ring;the second termination is electrically connected to the first surface;the first termination of any one reactive impedance element is spaced apart from the first termination of any other reactive impedance element; andthe second termination of any one reactive impedance element is spaced apart from the second termination of any other reactive impedance element; and a passive antenna comprising:
a second conducting ring, wherein:
the second conducting ring is substantially parallel to the second surface;the second conducting ring is spaced apart from the second surface; andthe second conducting ring has a second center, wherein the second center is disposed substantially on the antenna axis;a second radiating conductor having a third end and a fourth end, wherein:
the third end is electrically connected to a third point on the second conducting ring;the fourth end is electrically connected to a fourth point on the second conducting ring; andthe second radiating conductor passes through substantially the second center; anda second set of reactive impedance elements, wherein, for each reactive impedance element in the second set of reactive impedance elements:
the reactive impedance element is substantially parallel to the antenna axis;the reactive impedance element has a third termination and a fourth termination;the third termination is electrically connected to the second conducting ring;the fourth termination is electrically connected to the second surface;the third termination of any one reactive impedance element is spaced apart from the third termination of any other reactive impedance element; andthe fourth termination of any one reactive impedance element is spaced apart from the fourth termination of any other reactive impedance element.