Circular polarized helical radiation element and its array antenna operable in TX/RX band

• US 20060119532A1
• Filed: 12/06/2005
• Published: 06/08/2006
• Est. Priority Date: 12/07/2004
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Jeon, Soon-Ik, Kim, Chang-Joo, Jung, Young-Bae, Yun, Jae-Seung, Eom, Soon-Young
• Granted Patent: US 7,944,404 B2
• Time in Patent Office: Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/362 for broadside radiating helical antennas
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 13/02 Waveguide horns
• CPC Class Codes: H01Q 13/0241 radiating a circularly polarised wave H01Q13/0258 takes precedence; polarisation converters H01Q15/244, in a waveguide H01P1/17

Abstract

Provided are Circular Polarized Helical Radiation element and its Array Antenna operable in TX band and RX band. The circular polarized helical radiation element and its array antenna and the antenna with double reflection boards using that array can operate at TX/RX dual band which is high frequency such as Ka band by operating the helical antenna in axial mode and implementing dual feeding structure. The array antenna having a number of radiation elements operable in the both of TX band and RX band, wherein the radiation elements are arrayed on predetermined column lines, each radiation element comprising: a helix for radiating orthogonal circular polarized waves in the different frequency bands wherein the helix is fed at its beginning point and its terminating point; and a wave guide for accommodating the helix.

Claims

1. An apparatus operable in the both of transmission (TX) band and receiving (RX) band, comprising:

at least one helical radiation element for radiating orthogonal circular polarized waves in the TX and RX bands, wherein the helical radiation element includes a helix, and opposite ends of the helix are coupled to the two feed lines, respectively.

2. The apparatus as recited in claim 1, wherein the helical radiation element includes:

a transmission feed means for radiating circular polarized waves of a TX band, which is located at an end point of the helix; and

a receiving feed means for receiving circular polarized waves of a RX band, which is located at a staring point of the helix, wherein the receiving circular polarized waves are orthogonal to the radiating circular polarized waves.

3. The radiation apparatus as recited in claim 1, wherein the helical radiation element includes a waveguide for accommodating the helix.

4. The apparatus as recited in claim 3, wherein the waveguide is a circular-shaped waveguide having two parts, wherein a diameter of at least one part is increased in a predetermined ratio.

5. The apparatus as recited in claim 1, wherein the helix has a predetermined number of turns and a diameter of the helix is gradually decreased or increased in a predetermined ratio, depending on the number of turns.

6. The apparatus as recited in claim 5, wherein the helix is supported by employing a dielectric member.

7. The apparatus as recited in claim 6, wherein the dielectric member has a groove accommodating the helix.

8. The apparatus as recited in claim 1, wherein the helix is formed using a photolithographic process for forming a conductor-strip arc pattern on the dielectric member and a soldering process for electrically coupling arcs on the pattern each other, wherein the dielectric member is reformed in a cone-shaped structure.

9. The radiation apparatus as recited in claim 2, wherein the transmission feed means is coupled to the end point of the helix in a propagation direction.

10. An array antenna having a number of radiation elements operable in the both of TX band and RX band, wherein the radiation elements are arrayed on predetermined column lines, each radiation element comprising:

a helix for radiating orthogonal circular polarized waves in the different frequency bands wherein the helix is fed at its beginning point and its terminating point; and

a waveguide for accommodating the helix.

11. The array antenna as recited in claim 10, further comprising a fist reflection board and a second reflection board for radiating and receiving the orthogonal polarized waves by implementing double reflection of the orthogonal polarized waves.

12. The array antenna as recited in claim 10, wherein the waveguide is a circular-shaped waveguide having two parts, wherein a diameter of at least one part is increased in a predetermined ratio.

13. A circular polarized array antenna, having double reflection boards, of the unit radiation elements operating in circular polarized waves in the TX/RX band, comprising:

a reflection means for transmitting and receiving signals after reflecting twice; and

a feed array unit having a number of radiation elements which are arrayed in a predetermined interval,

wherein the radiation element includes

a helix for radiating orthogonal circular polarized waves in the different frequency bands wherein the helix is fed at its beginning point and its terminating point; and

a waveguide for accommodating the helix.

14. The method for preparing a helical antenna, comprising the steps of:

forming a pattern of a plurality of arcs on a dielectric board, wherein the shape of the dielectric board has fan-shaped structure;

positioning a number of conductor arcs for making a helix after transforming the fan-shaped dielectric board into a cone structure;

electrically coupling joining parts of conductor arcs helical structure to thereby for the helix; and

electrically connecting opposite points of the helix to two feeding ports, respectively.

15. The method as recited in claim 14, wherein a center of the conductor arcs is located at a point that is deviated from a center of an arc circumference of the fan shaped dielectric board to form the helix when the dielectric board is transformed into the cone structure.