Ultra-wideband mobile mount antenna apparatus having a capacitive ground structure-based matching structure

Patent metadata

Field	Value
Publication number	US-12040559-B2
Application number	US-202217929928-A
Country	US
Kind code	B2
Filing date	Sep 6, 2022
Priority date	Jun 25, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

An ultra-wideband mobile mount antenna with a capacitive ground structure-based matching structure. The antenna has a return loss better than 10 dB over an operating frequency range of 250 MHz to 1220 MHz.

First claim

What is claimed is:

1. An ultra-wideband antenna apparatus comprising:
a monopole antenna portion formed on a first side of a printed circuit board;
a ground pad formed on the first side of the printed circuit board and spaced apart from the antenna portion; and
a capacitive ground structure-based matching structure comprising a first portion that is vertical and coupled to the ground pad and a second portion that is horizontal and configured to be maintained above a metal reflector by a predetermined distance to form a capacitance between the second portion and the metal reflector for impedance matching of the antenna portion, the first portion and the second portion having a same length and same thickness.

2. The antenna apparatus of claim 1 , wherein the capacitive ground structure-based matching structure comprises a plurality of capacitive ground structures, each capacitive ground structure having a first portion and a second portion, the first portion of at least one capacitive ground structure being coupled to the ground pad and the second portion of each of the capacitive ground structures being configured to be maintained above the metal reflector by the predetermined distance.

3. The antenna apparatus of claim 2 , wherein the capacitive ground structure-based matching structure comprises four capacitive ground structures, the first portion of two of the capacitive ground structures being coupled to the ground pad, the first portion of two other capacitive ground structures being coupled to a second side of the printed circuit board, and the second portion of each capacitive ground structure being configured to be maintained above the metal reflector by the predetermined distance.

4. The antenna apparatus of claim 2 , wherein each capacitive ground structure is formed of a single conductive material that is bent at a predetermined angle to form the first and second portions.

5. The antenna apparatus of claim 4 , wherein the predetermined angle is a right angle.

6. The antenna apparatus of claim 4 , wherein the conductive material is selected from the group consisting of aluminum, brass, copper, gold, steel, titanium, tin and stainless steel.

7. The antenna apparatus of claim 2 , further comprising a housing, the housing comprising a first housing portion covering the antenna portion, ground pad and capacitive ground structure-based matching structure, and the housing having a base portion adapted to couple the first housing portion to the metal reflector such that the second portion of each of the capacitive ground structures is maintained above the metal reflector by the predetermined distance.

8. The antenna apparatus of claim 1 , wherein the antenna portion is a planar circular monopole antenna coupled to an antenna output via a co-planar waveguide.

9. The antenna apparatus of claim 1 , wherein the antenna apparatus has a return loss of better than 10 dB over an operating frequency range of 250 MHz to 1220 MHz.

10. The antenna apparatus of claim 1 , further comprising an output adapted to be coupled to a leakage detector.

11. An ultra-wideband mobile mount antenna apparatus comprising:
a monopole antenna portion formed on a first side of a printed circuit board;
a ground pad formed on the first side of the printed circuit board and spaced apart from the antenna portion;
a capacitive ground structure-based matching structure comprising a first portion that is vertical and coupled to the ground pad and a second portion that is horizontal, the first portion and the second portion having a same length and same thickness; and
a mounting mechanism adapted to maintain the capacitive ground structure-based matching structure above a metal reflector to form a capacitance between the second portion and the metal reflector;
wherein the antenna apparatus has a return loss of 10 dB or better over an operating frequency range of 250 MHz to 1220 MHz.

12. The antenna apparatus of claim 11 , wherein the capacitive ground structure-based matching structure comprises a plurality of capacitive ground structures, each capacitive ground structure having a first portion and a second portion, the first portion of at least one capacitive ground structure being coupled to the ground pad and the second portion of each of the capacitive ground structures being configured to be maintained above the metal reflector by a predetermined distance.

13. The antenna apparatus of claim 12 , wherein the capacitive ground structure-based matching structure comprises four capacitive ground structures, the first portion of two of the capacitive ground structures being coupled to the ground pad, the first portion of two other capacitive ground structures being coupled to a second side of the printed circuit board, and the second portion of each capacitive ground structure being configured to be maintained above the metal reflector by the predetermined distance.

14. The antenna apparatus of claim 12 , wherein each capacitive ground structure is formed of a single conductive material that is bent at a predetermined angle to form the first and second portions.

15. The antenna apparatus of claim 14 , wherein the predetermined angle is a right angle.

16. The antenna apparatus of claim 14 , wherein the conductive material is selected from the group consisting of aluminum, brass, copper, gold, steel, titanium, tin and stainless steel.

17. The antenna apparatus of claim 12 , further comprising a housing, the housing comprising a first housing portion covering the antenna portion, ground pad and capacitive ground structure-based matching structure, and the housing having a base portion adapted to cover the mounting mechanism.

18. The antenna apparatus of claim 11 , wherein the antenna portion is a planar circular monopole antenna coupled to an antenna output via a co-planar waveguide.

19. The antenna apparatus of claim 11 , further comprising an output adapted to be coupled to a leakage detector.

20. The antenna apparatus of claim 11 , wherein the reflector is a metal portion of a vehicle.

Assignees

• Viavi Solutions Inc

Inventors

• Sun Dexin
• Stelle Iv Raleigh B

Classifications

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• H01Q1/2283

  mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package · CPC title

• H01Q19/10

  using reflecting surfaces · CPC title

• H01Q1/32

  Adaptation for use in or on road or rail vehicles · CPC title

• H01Q9/30

  with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence) · CPC title