Antennas

• US 9,935,371 B2
• Filed: 04/29/2016
• Issued: 04/03/2018
• Est. Priority Date: 04/29/2016
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Inventors: Jervis, James W., He, Fanfan
• Primary Examiner(s): Phan, Tho G
• Application Number:
  US15/142,648
• Publication Number:
  US 20170317416A1
• Time in Patent Office: 704 Days
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 5/364 Creating multiple current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/20 Two collinear substantially straight active elements; Substantially straight single active elements H01Q9/28 takes precedence
• CPC Class Codes: H01Q 9/32 Vertical arrangement of element H01Q9/40 takes precedence

Abstract

An example method of designing a multi-band antenna includes specifying a first portion of the multi-band antenna in a tangible medium, where the first portion corresponds to an existing design of a single-band monopole antenna for operating in a first frequency band, and specifying in the tangible medium a second portion of the multi-band antenna that is added to the first portion, where the second portion includes a dipole parasitic resonator that is resonant in a second frequency band.

Claims

1. A multi-band antenna comprising:

a first portion that corresponds to a monopole antenna operable in a first frequency band, the first portion comprising;

a first segment connected to a ground plane portion and extending away from the ground plane portion,

a second segment connected to the first segment and extending away therefrom in a first direction that is approximately parallel to the ground plane portion, and

a third segment connected to the second segment and extending away therefrom in a second direction that is away from the ground plane portion, a signal source being connected to the third segment; and

a second portion connected to the first portion as a dipole parasitic resonator that is resonant in a second frequency band, the second portion comprising a fourth segment that;

is connected to the second segment at approximately a longitudinal center of the fourth segment,

faces the third segment, and

has a longitudinal axis oriented along a third direction that is approximately perpendicular to the first direction.

2. The multi-band antenna of claim 1,

wherein a maximum height of the multi-band antenna above the ground plane is less than or equal to 11 mm.

3. The multi-band antenna of claim 1,

wherein a VSWR of the multi-band antenna is less than 2 to 1 throughout the first and second frequency bands.

4. The multi-band antenna of claim 1,

wherein the first frequency band includes a 5 GHz frequency band, and

the second frequency band includes a 2 GHz frequency band.

5. The multi-band antenna of claim 1,

wherein the second segment is a shunt matching inductor that provides a parallel inductance to cancel a shunt capacitance realized by the first portion.

6. A method of forming a specification of a multi-band antenna, comprising:

specifying a first portion of the multi-band antenna in a tangible medium, the first portion corresponding to an existing design of a single-band monopole antenna for operating in a first frequency band, the existing design comprising;

a first segment connected to a ground plane portion and extending away from the ground plane portion,

a second segment connected to the first segment and extending away therefrom in a first direction that is approximately parallel to the ground plane portion, and

a third segment connected to the second segment and extending away therefrom in a second direction that is away from the ground plane portion, a signal source being connected to the third segment; and

specifying in the tangible medium a second portion of the multi-band antenna that is added to the first portion, the second portion comprising a fourth segment that acts as a dipole parasitic resonator that is resonant in a second frequency band and is connected to the second segment of the first portion.

7. The method of claim 6,

wherein a maximum height of the multi-band antenna above a ground plane is less than or equal to 11 mm.

8. The method of claim 6,

wherein the fourth segment:

is connected to the second segment at approximately a longitudinal center of the fourth segment,

faces the third segment, and

has a longitudinal axis oriented along a third direction that is approximately perpendicular to the first direction.

9. The method of claim 6,

wherein specifying the second portion of the multi-band antenna includes specifying that a geometry of the fourth segment and a distance between the fourth segment and the third segment are such that a VSWR of the multi-band antenna is less than 2 to 1 throughout the first and second frequency bands and a radiation pattern of the multi-band antenna is not significantly different from a radiation pattern of an antenna comprising the first portion without the second portion.

10. The method of claim 6,

wherein the first frequency band includes a 5 GHz frequency band and the second frequency band includes a 2 GHz frequency band.

11. A method of manufacturing a multi-band antenna, comprising:

forming a first portion of the multi-band antenna that, upon being formed, is a single-band monopole antenna that is operable in a first frequency band, the first portion including;

a first segment connected to a ground plane portion and extending away from the ground plane portion,

a second segment connected to the first segment and extending away therefrom in a first direction that is approximately parallel to the ground plane portion, and

a third segment connected to the second segment and extending away therefrom in a second direction that is away from the ground plane portion, a signal source being connected to the third segment;

forming a second portion of the multi-band antenna that is initially separate from the first portion and includes a fourth segment; and

connecting the fourth segment to the second segment such that the fourth segment acts as a dipole parasitic resonator that is resonant in a second frequency band.

12. The method of claim 11,

wherein a maximum height of the multi-band antenna above the ground plane is less than or equal to 11 mm.

13. The method of claim 11,

wherein connecting the fourth segment to the second segment includes connecting the fourth segment to the second segment at approximately a longitudinal center of the fourth segment such that the fourth segment:

faces the third segment, and

has a longitudinal axis oriented along a third direction that is approximately perpendicular to the first direction.

14. The method of claim 11,

wherein, upon the fourth segment being connected to the second segment, a geometry of the fourth segment and a distance between the fourth segment and the third segment are such that a VSWR of the multi-band antenna is less than 2 to 1 throughout the first and second frequency bands and a radiation pattern of the multi-band antenna is not significantly different from a radiation pattern of an antenna comprising the first portion without the second portion.

15. The method of claim 11,

wherein the first frequency band includes a 5 GHz frequency band and the second frequency band includes a 2 GHz frequency band.