Low-band reflector for dual band directional antenna

Patent metadata

Field	Value
Publication number	US-10230161-B2
Application number	US-201414217392-A
Country	US
Kind code	B2
Filing date	Mar 17, 2014
Priority date	Mar 15, 2013
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A dual band directional antenna with low frequency band reflectors that form desired antenna patterns in a low frequency band while remaining transparent to a higher frequency band. As a result of such frequency transparency, pattern changes in the lower frequency bands do not affect patterns in the higher band frequencies.

First claim

What is claimed is:

1. A directional antenna system, the system comprising:
a high-band reflector element; and
a low-band reflector element positioned relative the high-band reflector element,
wherein the low-band reflector element is a reflecting parasitic element operated to form a directional pattern in a direction perpendicular to a ground plane in a low-frequency band of two distinct frequency bands, and
wherein the low-band reflector element includes a meander line coupled directly to the ground plane and having a plurality of short circuited horizontal transmission lines stacked along a vertical direction and connected by vertical sections, each vertical section having a vertical height such that the low-band reflector element is tuned to resonate in the low frequency band,
wherein the low-band reflector element is transparent to an antenna pattern emitted by the high-band reflector element,
wherein the low-band reflector element is switched on and off without disturbing the antenna pattern emitted by the high-band reflector element.

2. The directional antenna system of claim 1 , wherein the low frequency band is at 2.4 GHz and a high frequency band of the two distinct frequency bands is at 5.0 GHz.

3. The directional antenna system of claim 1 , wherein the plurality of transmission lines have an electrical length such that the low-band reflector element is transparent to the antenna pattern emitted by the high-band reflector element.

4. The directional antenna system of claim 1 , wherein the antenna pattern emitted by the high-band reflector element is not affected by the low-band reflector element.

5. The directional antenna system of claim 1 , further comprising:
a second high-band reflector element positioned relative the high-band reflector element; and
a second low-band reflector element positioned relative the low band reflector element, the second low-band reflector element having a meander line.

6. The system of claim 1 , wherein each of the horizontal transmission lines has substantially the same length.

7. A method for implementing directional antenna patterns in a directional antenna system, the method comprising:
generating a first directional antenna pattern by reflecting a high frequency band of two distinct frequency bands by a high-band reflector element; and
generating a second directional antenna pattern in a direction perpendicular to a ground plane by reflecting a low frequency band of the two distinct frequency bands by a low-band reflector element positioned relative the-high band reflector element,
wherein the low-band reflector element is a reflecting parasitic element, and
wherein the low-band reflector element comprises a meander line coupled directly to the ground plane that includes a plurality of short circuited horizontal transmission lines stacked along a vertical direction and connected by vertical sections, each vertical section having a vertical height such that the low-band reflector element is tuned to resonate in the low frequency band,
wherein the low-band reflector element is transparent to the first directional antenna pattern emitted by the high-band reflector element,
wherein the low-band reflector element is switched on and off without disturbing the first directional antenna pattern emitted by the high-band reflector element.

8. The method of claim 7 , wherein the low frequency band is at 2.4 GHz and the high frequency band is at 5.0 GHz.

9. The method of claim 7 , wherein the plurality of transmission lines have an electrical length such that the low-band reflector element is transparent to the first directional antenna pattern emitted by the high-band reflector element.

10. The method of claim 7 , wherein the first directional antenna pattern emitted by the high-band reflector element is not affected by the low-band reflector element.

11. The method of claim 7 , further comprising:
generating a third antenna pattern at a second high-band reflector element positioned relative the high-band reflector element; and
generating a fourth antenna pattern at a second low-band reflector element positioned relative the low band reflector element, the second low-band reflector element having a meander line.

12. The method of claim 7 , wherein each of the horizontal transmission lines has substantially the same length.

Assignees

• Arris Entpr Llc

Inventors

• Baron Bernard
• Lin Chia-Ching
• Shtrom Victor

Classifications

• H01Q15/00

  Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices (variable for purpose of altering directivity H01Q3/00; arrangements of such devices for guiding waves H01P3/20; variable for purpose of modulation H03C7/02) · 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

• H01Q9/00

  Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements · CPC title

• H01Q25/00

  Antennas or antenna systems providing at least two radiating patterns (arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00) · CPC title

• H01Q19/32

  the primary active element being end-fed and elongated · CPC title