Secondary reflector with frequency selective surface

Abstract

A secondary reflector is provided which has structural strength based on the hexagonal design and which show frequency selective features and low insertion loss. The antenna system includes a main reflector at which an incoming RF signal from a signal source reaches, a secondary reflector at which the incoming RF signal reaches by being reflected from the main reflector, a second antenna feed to which a transmitted RF signal through the secondary reflector is directed and a first antenna feed to which a reflected RF signal from the secondary reflector is directed. The surface of the secondary reflector has a dielectric support layer with hexagonal holes and a frequency selective surface located on the support layer and having circular rings.

Claims

1. An antenna system comprising: a main reflector adapted to receive an incoming RF signal from a signal source; a secondary reflector adapted to receive the incoming RF signal reflected from said main reflector; a first antenna feed to which a reflected RF signal from said secondary reflector is directed; and a second antenna feed to which a transmitted RF signal through said secondary reflector is directed, wherein a surface of said secondary reflector comprises: a dielectric support layer having hexagonal holes; and a frequency selective surface located on said dielectric support, said frequency selective surface comprising circular rings.

2. The antenna system of claim 1, wherein the circular rings of said frequency selective surface are concentric with the hexagonal holes in said dielectric layer.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The configuration of the present invention and its advantages with further elements will become clear based on the drawings described below.

(2) FIG. 1 is a cell view containing the ring structures used in the two-layer structure of the frequency selective surface used in the antenna system.

(3) FIG. 2 is an overview of the two-layer structure of the frequency selective surface used in the antenna system of invention:

(4) FIG. 3 is a detailed view of the frequency selective surface used in the antenna system of the invention.

(5) FIG. 4 is the overview of the antenna system of the invention.

REFERENCE NUMBERS

(6) 1. Dielectric support layer

(7) 2. Frequency selective surface

(8) 3. Main reflector

(9) 4. Secondary reflector

(10) 5. First antenna feed

(11) 6. Second antenna feed

(12) A. Incoming RF signal

(13) B. Reflected RF signal

(14) C. Transmitted RF signal

DETAILED DESCRIPTION OF THE INVENTION

(15) In the herein detailed description, the preferred embodiments of the secondary reflector with frequency selective surface of the invention are described only for a better understanding of the subject matter, without posing any limitations.

(16) FIG. 4 is an overview of the antenna system of the invention. The invention basically comprises; a main reflector (3) at which an incoming RF signal (A) from a signal source reaches, a secondary reflector (4) at which the incoming RF signal (A) reaches by being reflected from the main reflector (3), a second antenna feed (6) to which a transmitted RF signal (C) through the secondary reflector (4) is directed and a first antenna feed (5) to which a reflected RF signal (B) from the secondary reflector (4) is directed. The surface of the secondary reflector (4) comprises a dielectric support layer (1) comprising hexagonal holes and a frequency selective surface (2) located on the support layer (1) and comprising circular rings.

(17) The Operating Principle of the System is as Follows:

(18) After the incoming RF signal (A) from the signal source is reflected from the main reflector (3), it is split into two parts as the transmitted RF signal (C) and the reflected RF signal (B) by the frequency selective surface (2) located on the support layer (1) located on this reflector (4). In order to minimize the losses due to the mentioned splitting process, the support layer (1) is in the form of a mesh consisting of hexagonal holes (FIGS. 1, 2 and 3). The frequency selective surface (2) positioned on the mentioned support layer (1) is in the form of a mesh consisting of circular rings placed in hexagonal pattern. Due to the hexagonal hole structure of the said frequency selective surface (2), the loss encountered during the splitting into two parts is at an ignorable level.

(19) In the secondary reflector (4), metal units are positioned by means of dielectric material. The use of dielectric materials increases insertion loss on the frequency selective surface and decreases the reflection values. Due to being formed of hexagonal holes, performance losses from dielectrics are minimized by using a minimum level of material in the dielectric support layer (1).

(20) FIGS. 1, 2 and 3 show the dielectric support layer of the secondary reflector antenna system consisting of hexagonal holes. There are circles around the hexagonal holes. There is no connection between circles and hexagons. In a preferred embodiment of the invention, hexagonal holes and circular rings are concentric in order to ensure mechanical stability.