CN2159614Y

CN2159614Y - Light, High effective, low noise antenna

Info

Publication number: CN2159614Y
Application number: CN 93238132
Authority: CN
Inventors: 陈振宇; 陈章梁
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-08
Filing date: 1993-02-08
Publication date: 1994-03-23
Anticipated expiration: 2003-02-08

Abstract

The utility model provides a light dielectric core feedhorn with high efficiency and low noise, which belongs to the improvement of existing dielectric loading horns. The utility model comprises a horn-shaped outer shell and a low-loss dielectric core which is matched with the horn-shaped outer shell, the low-loss dielectric core is at least composed two layers along electromagnetic wave propagation direction, the equivalent relative dielectric constants of the layers of the dielectric core are different and respectively are from epsilon 1 to epsilon N; the thickness of the layers of dielectric core are form l1 to lN. The utility model has the characteristics of light weight, small dielectric gain loss, low dielectric thermal noise temperature, small input voltage standing wave ratio, etc.

Description

Light, High effective, low noise antenna

The utility model relates to a kind of improved dielectric loaded horn, particularly a kind of light-duty, efficient, low-noise media core horn antenna.

Known corrugated horn is a kind of low-cross polarization, low sidelobe level, feed efficiently.But its shortcoming is the manufacturing cost height, Heavy Weight, as a kind of substitute, dielectric loaded horn has been done a large amount of principle research abroad in recent years, and designed some tests that are used for proof theory with in kind, the dielectric core of these dielectric loaded horns constitutes with a kind of medium, therefore weight is big, and gain loss is big, and higher equivalent noise temperature is arranged, it is generally acknowledged that to be used for millimeter wave better, but extremely be difficult to make at millimeter band corrugated horn.

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of light-duty, efficient, low-noise media core horn antenna is provided.

The utility model provides a kind of light-duty, efficient, low-noise media core horn antenna, it comprises tubaeform shell and the low loss dielectric fuse that matches with tubaeform shell, and the low loss dielectric fuse constitutes by at least two layers along the electromagnetic wave propagation direction, the equivalent relative dielectric constant difference of each layer, be respectively ∈ 1, ∈ 2 ..., ∈ N, the thickness of each layer is respectively l1, l2 ..., lN.Tubaeform shell is made by metal or by the plastics that inwall is coated with metal, and the cross section of its tubaeform shell can be circular, square, ellipse or rectangle etc., and concrete shape can be decided according to specification requirement.

The number of plies of above-mentioned low loss dielectric fuse is N, N 〉=3, and the shape of cross section of medium fuse is similar to tubaeform shell, and an air gap is arranged between the inwall of each layer low loss dielectric fuse and tubaeform shell.

The equivalent relative dielectric constant ∈ 1=√ ∈ 2 of above-mentioned each layer, ∈ 3=a ∈ 2 ..., ∈ N-1=a ∈ N-2, ∈ N=√ ∈ N-1, wherein a is the constant greater than 1, ground floor and N layer all play the matching effect between medium and the air, so make ι 1=λ O/4

, lN=λ O/4

, (λ o is airborne central task wavelength), the second layer becomes geometric progression to the relative dielectric constant of N-1 layer, helps wave guide mode like this and carries out the transition to the mixing mould as early as possible naturally, and l2 depends on the circumstances to following the example of of lN-1.

The equivalent relative dielectric constant of above-mentioned each layer also can be ∈ 2=a ∈ 1, ∈ 3=a ∈ 2 ..., ∈ N-1=a ∈ N-2, ∈ N=

, wherein a is the constant greater than 1, if ∈ 1 is smaller, it can mate preferably with air, so as long as make N layer and air coupling.Equally, get lN=λ O/4

, l1 depends on the circumstances to following the example of of lN-1.

Relevant with the size of ∈ N-1 in the utility model greater than choosing of 1 constant a, determine that mainly a of selection can form enough mixing moulds near both can having made horn mouth by test, the reflection that the medium fuse is caused is enough little.

Above-mentioned low loss dielectric fuse adopts low consumption, dielectric constant higher, and the polystyrene that lightweight and cost are low or other dielectric material that is fit to are made, and obtain the required relative dielectric constant value of each layer by punching vertically.Hole count on every square metre of wavelength area is more than 4, and the shared sectional area in above-mentioned hole is bigger, and equivalent relative dielectric constant is low more.

The big end of above-mentioned low loss dielectric fuse outwards protrudes, and constitutes a di-lens.To reduce the bore of antenna.The low loss dielectric fuse is by the media protection cover location of fixedlying connected with tubaeform shell.

The utlity model has following advantage:

1. in light weight.

2. the medium gain loss is little.

3. the medium heat noise temperature is low.

4. standing wave ratio of input voltage is little.

Describe an embodiment of the present utility model in detail below in conjunction with accompanying drawing.

The structural representation of the existing dielectric loaded horn antenna of Fig. 1.

Fig. 2 structural representation of the present utility model.

The punching schematic diagram of each layer of Fig. 3 low loss dielectric fuse.

The directional diagram of Fig. 4 the utility model E, H face on satellite TV's frequency range.

Accompanying drawing 2～Fig. 3 has described the embodiment of the utility model as C-band circular cone medium feed.It comprises tubaeform shell (1), tubaeform shell (1) adopts metal to make, its cross sections is shaped as circle, low loss dielectric fuse (2) is arranged in the tubaeform shell (1), low loss dielectric fuse (2) is made of the N layer along the electromagnetic wave propagation direction, N＞3, the shape of cross section of each layer medium fuse (2) is similar to tubaeform shell (1), each layer low loss dielectric fuse (2) all and an air gap (3) arranged between the inwall of tubaeform shell (1), getting ∈ N-1 is 2.5 o'clock, it is airborne maximum functional wavelength that gap width is about 0.1 λ max(λ max), the equivalent relative dielectric constant difference of each layer low loss dielectric fuse (2) is respectively ∈ 1, ∈ 2,, ∈ N, ∈ 1=

, ∈ 3=a ∈ 2 ..., ∈ N-1=a ∈ N-2, ∈ N=

, wherein a is the constant greater than 1, the thickness of each layer low loss dielectric fuse (2) is respectively l1, and l2 ..., lN, L1=λ O/4

, lN=λ O/4

(λ o is airborne central task wavelength), l2=l3=...=lN-1.Each layer low loss dielectric fuse (2) adopts all that low consumption, dielectric constant are higher, lightweight and the low polystyrene of cost are made, and all is equipped with several holes (4) on each layer low loss dielectric fuse (2), to obtain the required relative dielectric constant value of above-mentioned each layer.The big end of low loss dielectric fuse (2) is made a di-lens that outwards protrudes; to reduce antenna aperture; the outside of N layer low loss dielectric fuse (2) is covered with media protection cover (5); the thickness of media protection cover (5) is much smaller than operation wavelength; media protection cover (5) is fixedlyed connected with tubaeform shell (1); except that playing rainproof dirt effect, also low loss dielectric fuse (2) is worked to support the location.

Fig. 4 has described present embodiment on satellite TV's frequency range, works as V _SWR≤ 1.2 o'clock E, the directional diagram of H face.Wherein fine line is the directional diagram of H face, and dotted line is the directional diagram of E face.Therefrom E, H face directional diagram etc. are changed finely as can be seen, and it is very little that beamwidth changes on whole frequency, and medium fuse length is less than a wavelength, and medium gain is lost less than 0.02dB, and equivalent thermal noise temperature is less than 2.0 ° of K.

Claims

1, a kind of light-duty, efficient, low-noise media core horn antenna, the low loss dielectric fuse that comprises tubaeform shell and match with it, it is characterized in that the low loss dielectric fuse constitutes by at least two layers along the electromagnetic wave propagation direction, the equivalent relative dielectric constant difference of each layer medium fuse, be respectively ∈ 1, ∈ 2 ..., ∈ N; The thickness of each layer medium fuse is L1, L2, LN.

2, light-duty, efficient, low-noise media core horn antenna according to claim 1, the number of plies that it is characterized in that described low loss dielectric fuse is N, N 〉=3, the shape of cross section of medium fuse is similar to tubaeform shell, and an air gap is arranged between the inwall of each layer low loss dielectric fuse and tubaeform shell.

3, light-duty, efficient, low-noise media core horn antenna according to claim 1 and 2, the equivalent relative dielectric constant ∈ 1=√ ∈ 2 that it is characterized in that described each layer, ∈ 3=a ∈ 2, ∈ N-1=a ∈ N-2, ∈ N=√ ∈ N-1, wherein a is the constant greater than 1, thickness l1 and lN are respectively 1/4 central task wavelength in the 1st, the N layer medium.

4, light-duty, efficient, low-noise media core horn antenna according to claim 1 and 2, the equivalent relative dielectric constant ∈ 2=a ∈ 1 that it is characterized in that described each layer, ∈ 3=a ∈ 2, ∈ N-1=a ∈ N-2, ∈ N=√ ∈ N-1, wherein a is the constant greater than 1, thickness lN is 1/4 a central task wavelength in the N layer medium.

5, light-duty, efficient, low-noise media core horn antenna according to claim 1 and 2 is characterized in that on described each layer low loss dielectric fuse the hole of beating vertically being arranged.

6, light-duty, efficient, low-noise media core horn antenna according to claim 1 and 2; the big end that it is characterized in that described low loss dielectric fuse outwards protrudes di-lens of formation, and the low loss dielectric fuse is by the media protection cover location of fixedlying connected with tubaeform shell.