Antenna device

• US 6,707,433 B2
• Filed: 10/25/2002
• Issued: 03/16/2004
• Est. Priority Date: 02/26/2001
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ohtsuka, Masataka, Urasaki, Shuji, Chiba, Isamu
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US10/258,484
• Publication Number:
  US 20030090433A1
• Time in Patent Office: 508 Days
• Field of Search: 343/825, 343/826, 343/844, 343/853, 343/893
• US Class Current: 343/844
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 21/20 the units being spaced along or adjacent to a curvilinear path slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062
• CPC Class Codes: H01Q 21/22 Antenna units of the array energised non-uniformly in amplitude or phase, e.g. tapered array or binomial array
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence

Abstract

A plurality of concentric circle array antennas each having a different radius are disposed on an identical plane, and a plurality of element antennas are arranged circumferentially in each of the concentric circle array antennas. The plurality of concentric circle array antennas are arranged at regular intervals d in most part thereof, and the concentric circle array antennas corresponding to a remaining part of the plurality of concentric circle array antennas are arranged at intervals d±0.4 to 0.6d. The radii of the part of plural concentric circles change by ±(0.4 to 0.6)d, so that it is possible to reduce a wide-angle side lobe.

Claims

1. An antenna device comprising a plurality of concentric circle array antennas each having a different radius on an identical plane,

wherein a plurality of element antennas are arranged circumferentially in each of the concentric circle array antennas,

wherein said plurality of concentric circle array antennas are arranged at regular intervals d in most part thereof, and

wherein the concentric circle array antennas corresponding to a remaining part of said plurality of concentric circle array antennas are arranged at intervals d±

(0.4 to 0.6)d.

2. An antenna device according to claim 1, wherein the interval of said plurality of concentric circle array antennas is set to one wavelength or longer.

3. An antenna device comprising a plurality of concentric circle array antennas each having a different radius on an identical plane,

wherein a plurality of element antennas are arranged circumferentially in each of the concentric circle array antennas,

wherein said plurality of concentric circle array antennas are divided into groups including four continuous concentric circle array antennas, and one of the four concentric circle array antennas which are included in each of the groups is arranged at an interval d±

(0.4 to 0.6)d, and

wherein the three remaining concentric circle array antennas in each of said groups are arranged at the regular intervals d.

4. An antenna device according to claim 3, wherein the interval of said plurality of concentric circle array antennas is set to one wavelength or longer.

5. An antenna device comprising:

a first concentric circle array antenna having a plurality of element antennas arranged at regular intervals in a circumferential direction and having a radius a_n=L_n·

d where a radius coefficient is L_n (n is an integer), and a reference interval of the concentric circle array antennas is d; and

a second concentric circle array antenna having a plurality of element antennas arranged at regular intervals in a circumferential direction and having a radius a_n+1=L_n+1·

d±

(0.4 to 0.6)d.

6. An antenna device according to claim 5, wherein the interval of said first and second concentric circle array antennas is set to one wavelength or longer.