GNSS base station antenna system with reduced sensitivity to reflections from nearby objects

Patent metadata

Field	Value
Publication number	US-10197679-B2
Application number	US-201414372499-A
Country	US
Kind code	B2
Filing date	Jan 16, 2014
Priority date	Jan 16, 2014
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

An antenna system includes an electromagnetic radiator assembled on a ground plane. The ground plane containing a nontransparent area in a center of the ground plane and a semitransparent area surrounding the nontransparent area. The nontransparent area is circular in shape. The semitransparent area is generally circular in shape and contains at least one slot. A plurality of vertical conducting elements are in proximity of a boundary between the nontransparent area and the semitransparent area on a bottom side of the ground plane. The vertical conducting elements are arranged in a circle around a center of the electromagnetic radiator.

First claim

What is claimed is:

1. A GNSS (global navigation satellite system) antenna system comprising:
an electromagnetic radiator configured for reception of Right Hand Circularly Polarized GNSS signals, and assembled on an upper side of a ground plane,
wherein the ground plane includes a nontransparent area in a center of the ground plane and a partially transparent area surrounding the nontransparent area, and wherein the partially transparent area reflects 10% to 90% of the GNSS signals at frequency ranges 1165-1300 MHz and 1530-1610 MHz,
wherein either the nontransparent area or the partially transparent area is circular; and
a plurality of vertical conducting elements near a boundary between the nontransparent area and the partially transparent area in the nontransparent area on a bottom side of the ground plane and extending downwards from the ground plane, the vertical conducting elements arranged in a circle of a diameter of at least 155 mm, around a center of the electromagnetic radiator and connected to the ground plane at the nontransparent area.

2. The antenna system of claim 1 , wherein the nontransparent area is a conductive metal surface.

3. The antenna system of claim 1 , wherein the nontransparent area is an impedance surface with imaginary surface impedance of an open circuit.

4. The antenna system of claim 1 , wherein the partially transparent area is a metal surface with a set of slots with discrete or distributed elements.

5. The antenna system of claim 4 , further comprising only one annular slot on a boundary between the nontransparent area and the partially transparent area.

6. The antenna system of claim 1 , wherein the vertical conducting elements are parasitic conducting pins.

7. The antenna system of claim 6 , wherein the conducting pins are cylindrically-shaped.

8. The antenna system of claim 6 , wherein the conducting pins are mushroom-shaped.

9. The antenna system of claim 1 , wherein the conducting pins are bolts inserted into corresponding holes in a ground plane from a top side, and further comprising a nut at an end of each bolt, the nut being galvanically connected to an expanded tip of each pin.

10. The antenna system of claim 1 , further comprising a plurality of resistive elements connecting the nontransparent area and the partially transparent area.

11. The antenna system of claim 10 , wherein the resistive elements are discrete.

12. The antenna system of claim 10 , wherein the resistive elements are distributed.

13. The antenna system of claim 1 , further comprising a plurality of inductive elements connecting the nontransparent area and the partially transparent area.

14. The antenna system of claim 13 , wherein the inductive elements are discrete.

15. The antenna system of claim 13 , wherein the inductive elements are distributed.

16. The antenna system of claim 1 , wherein the partially transparent area is divided into multiple sections arranged circumferentially and having gaps between the sections.

17. The antenna system of claim 16 , further comprising inductive or resistive elements connecting the sections.

18. The antenna system of claim 16 , further comprising inductive or resistive elements connecting at least some of the sections.

19. The antenna system of claim 1 , wherein the partially transparent area is divided into a first set of multiple sections arranged circumferentially and having gaps between the sections, and a second set of multiple sections arranged circumferentially and having gaps between the sections and surrounding the first set.

Assignees

• Topcon Positioning Systems Inc

Inventors

• Astakhov Andrey Vitalievich
• Tatarnikov Dmitry Vitalievich
• Shamatulsky Pavel Petrovich
• Stepanenko Anton Pavlovich

Classifications

• H01Q9/0428

  radiating a circular polarised wave · CPC title

• H01Q9/0407

  Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40) · CPC title

• H01Q1/52

  Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) · CPC title

• G01S19/22 Primary

  Multipath-related issues · CPC title

• H01Q1/48 Primary

  Earthing means; Earth screens; Counterpoises · CPC title