INTERWOVEN SPIRAL ANTENNA

• US 20130009837A1
• Filed: 09/30/2011
• Published: 01/10/2013
• Est. Priority Date: 07/05/2011
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: ALEXOPOULOS, NICOLAOS G., YOON, SEUNGHWAN
• Granted Patent: US 9,118,115 B2
• Time in Patent Office: Days
• US Class Current: 343/843
• 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 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 9/27 Spiral antennas

Abstract

An interwoven spiral antenna includes a non-inverted spiral section, an inverted spiral section, and an excitation region. The non-inverted spiral section has a spiral shape and the inverted spiral section has an inverted spiral shape. The excitation region is coupled to at least one of the non-inverted spiral section and the inverted spiral section, wherein, when excited, the interwoven spiral antenna has a circular polarization.

Claims

1. An interwoven spiral antenna comprises:

a non-inverted spiral section having a spiral shape;

an inverted spiral section having an inverted spiral shape; and

an excitation region coupled to at least one of the non-inverted spiral section and the inverted spiral section, wherein, when excited, the interwoven spiral antenna has a circular polarization.

2. The interwoven spiral antenna of claim 1 further comprises:

when excited, a bandwidth having a high frequency corner, a low frequency corner, and a band pass region, wherein the high frequency corner is substantially established by dimensions of the excitation region, the low frequency corner is substantially established by a circumference of the interwoven spiral antenna, and wherein the band pass region has a substantially constant impedance.

3. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section collectively providing a Celtic spiral.

4. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section collectively providing an Archimedes spiral.

5. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section collectively providing a Celtic logarithmic spiral.

6. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section coupled together at a center region of the interwoven spiral antenna; and

the excitation region includes an excitation point at the center region and a return connection.

7. The interwoven spiral antenna of claim 1 further comprises:

each of the non-inverting spiral section and the inverted spiral section having a length of m*one-half wavelength, where m is an integer greater than or equal to one.

8. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section coupled together at a center region of the interwoven spiral antenna; and

the excitation region includes a first excitation point, a second excitation point, and a return excitation point, wherein the return excitation point is at the center region, the first excitation point is at a non-centered end of the non-inverted spiral section, and the second excitation point is at a non-centered end of the inverted spiral section, wherein the first and second excitation points are excited with a substantially similar signal.

9. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section coupled together at a center region of the interwoven spiral antenna; and

the excitation region includes a non-inverting excitation point and an inverting excitation point, wherein the non-inverting excitation point is at a non-centered end of the non-inverted spiral section and the inverting excitation point is at a non-centered end of the inverted spiral section to provide a differential input antenna.

10. The interwoven spiral antenna of claim 1 further comprises:

the non-inverting spiral section and the inverted spiral section are separated by a distance at a center region of the interwoven spiral antenna; and

the excitation region includes a first excitation point and a second excitation point, wherein the first excitation point is at a non-centered end of the non-inverted spiral section, and the second excitation point is at a non-centered end of the inverted spiral section to provide a dipole antenna.

11. A Celtic spiral antenna comprises:

a substrate;

an electromagnetic conductive trace on at least one layer of the substrate, wherein the electromagnetic conductive trace has a Celtic spiral shape; and

an excitation region coupled to the electromagnetic conductive trace.

12. The Celtic spiral antenna of claim 11 further comprises:

when excited, a bandwidth having a high frequency corner, a low frequency corner, and a band pass region, wherein the high frequency corner is substantially established by dimensions of the excitation region, the low frequency corner is substantially established by a circumference of the electromagnetic conductive trace, and wherein the band pass region has a substantially constant impedance.

13. The Celtic spiral antenna of claim 11 further comprises:

the excitation region including an excitation point and a return connection, wherein the excitation point is located substantially at a center of the electromagnetic conductive trace.

14. The Celtic spiral antenna of claim 11 further comprises:

the electromagnetic conductive trace has a length of m*wavelength, where m is an integer greater than or equal to one.

15. The Celtic spiral antenna of claim 11 further comprises:

the excitation region including a first excitation point, a second excitation point, and a return excitation point, wherein the return excitation point is located substantially at a center of the electromagnetic conductive trace, the first excitation point is at a first end of the electromagnetic conductive trace, and the second excitation point is at a second end of the electromagnetic conductive trace, wherein the first and second excitation points are excited with a substantially similar signal.

16. The Celtic spiral antenna of claim 11 further comprises:

the excitation region including a non-inverting excitation point and an inverting excitation point, wherein the non-inverting excitation point is at a first end of the electromagnetic conductive trace and the inverting excitation point is at a second end of the electromagnetic conductive trace to provide a differential input antenna.