Triple-band offset hybrid antenna using shaped reflector

• US 7,167,138 B2
• Filed: 12/02/2004
• Issued: 01/23/2007
• Est. Priority Date: 12/27/2003
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Jeon, Soon-Ik, Jung, Young-Bae, Yun, Jae-Seung, Eom, Soon-Young, Son, Seong-Ho
• Primary Examiner(s): Wimer; Michael C.
• Application Number:
  US11/003,883
• Publication Number:
  US 20050140563A1
• Time in Patent Office: 782 Days
• Field of Search: 343/781.P, 343/840, 343/700.MS, 343/853, 343/779, 343/781.R, 343/835
• US Class Current: 343/781.00R
• CPC Class Codes: H01Q 19/17 the primary radiating source comprising two or more radiating elements H01Q19/15, H01Q25/00 take precedence
• CPC Class Codes: H01Q 3/2658 Phased-array fed focussing structure

Abstract

A triple-band offset hybrid antenna having a shaped reflector is disclosed. The triple-band offset hybrid antenna includes: a shaped reflector reflecting a K/Ku bands RF signals received from a satellite to focus an energy of the K/Ku band RF signals on a focal line and reflecting a Ka band RF transmitting signal; and a triple-band active phased feed array receiving the reflected K/Ku bands RF signals from the shaped reflector and radiating the Ka band RF transmitting signal to the shaped reflector, wherein the triple-active feed array including Ka/K bands feed array for transceiving Ka/K bands RF signal and a Ku band feed array for receiving a Ku band RF signal.

Claims

1. A triple-band offset hybrid antenna, comprising:

a shaped reflector reflecting K/Ku bands RF signals received from a satellite to focus an energy of the K/Ku bands RF signals on a focal line and reflecting a Ka band RF transmitting signal; and

a triple-band active phased feed array receiving the reflected K/Ku bands RF signals from the shaped reflector and radiating the Ka band RF transmitting signal to the shaped reflector,

wherein the triple-band active phased feed array including a Ka/K band feed array for transceiving a Ka/K bands RF signal and a Ku band feed array for receiving a Ku band RF signal, the Ku band feed array including a plurality of Ku band feed array elements symmetrically arranged at opposing sides of the Ka/K band feed array,

wherein Ka/K bands feed array includes a plurality of Ka/K bands feed array elements which are linearly arranged on the focal line and the Ku band feed array includes a plurality of Ku band feed array elements which are linearly arranged at a right side and a left side of the Ka/K bands feed array.

2. The triple-band offset hybrid antenna of the claim 1 wherein 23 Ka/K bands feed array elements are linearly arranged on the focal line with the element spacing of 9.4 mm between Ka/K bands feed array elements, which corresponds to 0.96 λ

₀ in Ka band (f₀=30.485 GHz) and 0.65 λ

₀ in K band (f₀=20.755 GHz), respectively.

3. The triple-band offset hybrid antenna of the claim 1 wherein 5 Ku band feed array elements are linearly arranged at the right side of the Ka/K bands feed array and 5 other Ku band feed array elements are linearly arranged at the left side of Ka/K bands feed array with the element spacing of 15 mm between Ku band feed array elements, which corresponds to 0.59 λ

₀ in Ku band (f₀=11.85 GHz).

4. The triple-band offset hybrid antenna of the claim 1 wherein 20 Ka/K bands feed array elements are linearly arranged on the focal line with the element spacing of 9.4 mm between Ka/K bands feed array elements, which corresponds to 0.96 λ

₀ in Ka band (f₀=30.485 GHz) and 0.65 λ

₀ in K band (f₀=20.755 GHz), respectively.

5. The triple-band offset hybrid antenna of the claims 2 wherein 3 Ku band feed array elements are linearly arranged at the right side of Ka/K bands feed array and 3 other Ku band feed array elements are linearly arranged at left side of Ka/K bands feed array with the element spacing of 15 mm between Ku band feed array elements, which corresponds to 0.59 λ

₀ in Ku band (f₀=11.85 GHz).

6. The triple-band offset hybrid antenna of claim 1, wherein the shaped reflector for one-dimensional beam scanning in elevation has a curvilinear rim structure to remove non-efficient areas of surface edge.

7. The triple-band offset hybrid antenna of claim 1 wherein the triple-band active phased feed array is offset from the shaped reflector.