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

Patent metadata

Field	Value
Publication number	US-11469502-B2
Application number	US-201916451849-A
Country	US
Kind code	B2
Filing date	Jun 25, 2019
Priority date	Jun 25, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

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;
a capacitive ground structure-based matching structure coupled to the ground pad and configured to be maintained above a metal reflector by a predetermined distance to form a capacitance, 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, the first portion of at least one other capacitive ground structure being coupled to a second side of the printed circuit board, and the second portion of each of the one or more capacitive ground structures being configured to be maintained above the metal reflector by the predetermined distance; and
an output adapted to be coupled to a leakage detector.

2. The antenna apparatus of claim 1 , 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.

3. The antenna apparatus of claim 2 , wherein the predetermined angle is a right angle.

4. The antenna apparatus of claim 2 , wherein the conductive material is selected from the group consisting of aluminum, brass, copper, gold, steel, titanium, tin and stainless steel.

5. The antenna apparatus of claim 1 , 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 one or more capacitive ground structures is maintained above the metal reflector by the predetermined distance.

6. 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.

7. 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.

8. 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 coupled to the ground pad; and
a mounting mechanism adapted to maintain the capacitive ground structure-based matching structure above a metal reflector to form a capacitance between the capacitive ground structure-based matching structure and the metal reflector;
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, the first portion of at least one other capacitive ground structure being coupled to a second side of the printed circuit board, and the second portion of each of the one or more capacitive ground structures being configured to be maintained above the metal reflector by the predetermined distance.

9. The antenna apparatus of claim 8 , 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.

10. The antenna apparatus of claim 9 , wherein the predetermined angle is a right angle.

11. The antenna apparatus of claim 9 , wherein the conductive material is selected from the group consisting of aluminum, brass, copper, gold, steel, titanium, tin and stainless steel.

12. The antenna apparatus of claim 8 , 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.

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

14. The antenna apparatus of claim 8 , wherein the reflector is a metal portion of a vehicle.

15. A mobile leakage detector system comprising:
an ultra-wideband antenna apparatus configured to detect frequencies between about 250 MHz and 1220 MHz, the 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 coupled to the ground pad and configured to be maintained above a metal reflector by a predetermined distance to form a capacitance, 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, the first portion of at least one other capacitive ground structure being coupled to a second side of the printed circuit board, and the second portion of each of the one or more capacitive ground structures being configured to be maintained above the metal reflector by the predetermined distance; and a second antenna apparatus configured to detect frequencies below about 250 MHz.

Assignees

• Viavi Solutions Inc

Inventors

• Sun Dexin
• Stelle Iv Raleigh B

Classifications

• H01Q19/10

  using reflecting surfaces · CPC title

• H01Q1/3275

  mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk · CPC title

• H01Q9/40 Primary

  Element having extended radiating surface · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H01Q5/25 Primary

  Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems · CPC title