Radio frequency antenna incorporating transmitter and receiver feeder with reduced occlusion

• US 10,784,586 B2
• Filed: 10/18/2018
• Issued: 09/22/2020
• Est. Priority Date: 10/22/2017
• Status: Active Grant

• Current Assignee: Mmrfic Technology PVT Limited
• Original Assignee: Mmrfic Technology PVT Limited
• Inventors: Thiagarajan, Ganesan, Ganeshan, Saravanakumar
• Primary Examiner(s): Alkassim, Jr., Ab Salam
• Application Number:
  US16/163,842
• Publication Number:
  US 20190123450A1
• Time in Patent Office: 705 Days
• CPC Class Codes: G01S 13/02 Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas
• CPC Class Codes: H01Q 15/04 comprising wave-guiding channel or channels bounded by effective conductive surfaces substantially perpendicular to the electric vector of the wave, e.g. parallel-plate waveguide lens
• CPC Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 19/021 Means for reducing undesirable effects
• CPC Class Codes: H01Q 19/062 for focusing
• CPC Class Codes: H01Q 19/19 comprising one main concave reflecting surface associated with an auxiliary reflecting surface
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 3/2658 Phased-array fed focussing structure

Abstract

An antenna system (201) comprising a set of transmitting elements (320A-K) and a set of receiving elements (310A-N) formed on a same or different planar surface (210), an electromagnetic lens (220) to focus electromagnetic rays transmitted from the set of transmitting elements (320A-K), a convex secondary antenna (240) operative to reflect the electromagnetic rays and a concave parabolic primary antenna (230) operative to transmit the electromagnetic rays in a first direction such that, the lens, the convex secondary antenna and the concave parabolic primary antenna together provide a transmitting gain in the first direction. The set of transmitting elements are disposed at central area of the planar surface and the set of receiving elements are disposed on the periphery of the central area such that the set of receiving elements occupy larger area on the planar surface compared to the set of transmitting elements.

Claims

1. An antenna system comprising:

a set of transmitting elements and a set of receiving elements formed on a planar surface with a first area, wherein set of transmitting elements are disposed at central area of the planar surface and the set of receiving elements are disposed on the periphery of the central area such that the set of receiving elements occupy larger area on the planar surface compared to the set of transmitting elements;

an electromagnetic lens to focus electromagnetic rays transmitted from the set of transmitting elements;

a convex secondary antenna operative to reflect the electromagnetic rays; and

a concave parabolic primary antenna operative to transmit the electromagnetic rays in a first direction such that, the lens, the convex secondary antenna and the concave parabolic primary antenna together provide a transmitting gain in the first direction, and the concave parabolic primary antenna and the convex secondary antenna together providing a receiver gain on the set of receiving elements;

wherein the occlusion of the transmitting elements is reduced by use of the electromagnetic lens and the occlusion of the receiving elements is reduced by disposing the set of receiving elements on the periphery;

the electromagnetic lens is positioned so only the electromagnetic rays from the transmitting elements pass through the electromagnetic lens.

2. The antenna system of claim 1, wherein the electromagnetic lens is placed close to the central area and the focal length is adjusted to focus electromagnetic rays transmitted from the set of transmitting elements on the overall area of the convex secondary antenna.

3. The antenna system of claim 2, wherein the set of transmitting elements and set of receiving elements form a multiple input multiple output (MIMO) antennas.

4. The antenna system of claim 3, wherein the MIMO antennas transmitting a plurality of phase shifted radar signals to detect an object.

5. The antenna system of claim 4, wherein a beam with a second gain is formed from the electromagnetic wave transmitted from the parabolic primary antenna and the direction of the beam is in the first direction when a phase angle between plurality of the phase shifted radar signal is same, the direction of the beam makes a positive angle with the first direction when the phase angle between plurality of the phase shifted radar signal is not same, in that, the second gain is due to the combination of transmitting gain and the phase angle between plurality of the phase shifted radar signal.