Low-band reflector for dual band directional antenna

• US 10,230,161 B2
• Filed: 03/17/2014
• Issued: 03/12/2019
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Ruckus IP Holdings LLC
• Original Assignee: ARRIS Enterprises LLC (CommScope Holding Company, Inc.)
• Inventors: Baron, Bernard, Lin, Chia-Ching, Shtrom, Victor
• Primary Examiner(s): Tran, Hai V
• Application Number:
  US14/217,392
• Publication Number:
  US 20140285391A1
• Time in Patent Office: 1,821 Days
• Field of Search: 343700 MS, 343702, 343837, 343895, 343843, 343745
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/52 Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure absorbing means H01Q17/00
• CPC Class Codes: H01Q 15/00 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 Class Codes: H01Q 19/32 the primary active element being end-fed and elongated
• CPC Class Codes: H01Q 25/00 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 Class Codes: H01Q 9/00 Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
• CPC Class Codes: H01Q 9/04 Resonant antennas
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

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.

Claims

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.