Composite dielectric material and antenna lens made of this material

FIELD: antenna engineering.

SUBSTANCE: proposed composite dielectric material used, for instance, to produce antenna lenses of desired dielectric constant and density capable of operating under vibrating load conditions at temperatures ranging between -60 and +85 °C has epoxy resin functioning as binder and hollow glass microspheres and titanium, as fillers, their proportion being given in invention specification.

EFFECT: enhanced resistance to vibrations, enlarged operating temperature range.

2 cl, 1 tbl

 

The invention relates to electrical engineering and can be used in antenna technology.

The development of technology of lens antennas along with the improvement of their designs including involves the creation of composite dielectric materials with required electrical and physical and physical-mechanical properties.

In the article "Dielectric lens antenna UHF and SHF ranges" (Foreign Radioelectronics No. 4/1990, Moscow, Radio I Svyaz', authors Skorodumov A.I., doctor of technical Sciences Troshin GI, Ph.D. Kharlanov YA, pp.93-94) indicated that composite insulators represent a mixture of different materials, changing the balance and composition which allows to achieve the required characteristics, including electrical. Contactee plastic (contactee foam) is a fundamentally new type of gas-filled plastics. They consist of a polymer (a binder), in which evenly on the size distribution of hollow or porous microspheres (organic or inorganic). Microspheres, the preferred diameter being 20...80 μm, can be made of polymers or ceramics, but is most often used glass (εeff=1,2...1,3; tgδ=(2...8)·10-4). Microspheres have zakrytoyacheistoy structure, so contactee foams have a number of advantages over conventional foams: a small water absorption, a high ratio of the absolute compressive strength, uniform density on volume, low shrinkage during curing, and improved dimensional stability at elevated temperature. Dielectric properties syntactic plastics can be varied within wide limits by changing the ratio of binder and filler, as well as their composition and manufacturing technology. In addition, the introduction of microspheres in composite dielectrics allows to achieve the desired density of the material.

Known cast dielectric element made of composite material, designed to work at radio frequencies (01Q 19/06, US 6489928 B2, published 03.12.2002 year). Dielectric lens is made of a composite material containing inorganic dielectric filler and the organic polymer with a dielectric constant of from 1 to 1.05, which have foams. The disadvantage is the possible heterogeneity of the composite material, resulting inside a shell made of such material, it is possible uneven dielectric constant.

Closest to the proposed invention is a composite dielectric material with improved homogeneity (01Q 15/08, NV 3/44, NV 3/00 (11), ER 1126545 A1, published 22.08.2001 g)containing polystyrene as a binder and filler is titanium dioxide. To improve the adhesion of the titanium dioxide with peep what laterolog composite dielectric material additionally contains a binder material, for example, wax, polyurethane or epoxy resin, in an amount of 1-25% relative to the total mass of the composition. Despite the fact that polystyrene has the lowest level of heat losses, its disadvantages are low thermostability (68-70°C) and high Flammability.

The aim of the invention is the production of composite dielectric material with high uniformity, operable in the temperature range from -60 to +85°and in conditions of vibration, intended, for example, for the manufacture of spherical dielectric lens.

This goal is achieved by the fact that the composite dielectric material contains as a binder of epoxy resin, and the filler is hollow glass microspheres and titanium dioxide in the following ratio, wt.%:

Epoxy74,3-82,8
Hollow glass microspheres5,7-12,5
Titanium dioxiderest

The use of epoxy resin ensures manufacturability and wetting ability, high adhesive and cohesive strength, low shrinkage during curing without allocation of by-products, and high moisture resistance of the composite dielectric is the material, the stability of its physico-mechanical and dielectric properties and, consequently, the stability of the radio characteristics of the product.

The use of hollow glass microspheres and titanium dioxide provides the production of composite dielectric material with a given dielectric constant and density.

Composite dielectric material made of these components has a homogeneous structure, which ensures repeatability of manufacture lenses with specified characteristics.

Were made four of the composition of the dielectric compositions. Measurement of dielectric permittivity were performed on samples of size 23±0,1×10±0,1×9,3 mm

Measurements ε was made on the VSWR meter panoramic P2-61 at a frequency of 1010Hz.

The measurement results are shown in table No. 1.

Table No. 1
IngredientsComposition, wt.%
1234
Epoxyan 81.2582,874,392,3
Titanium dioxide6,2510,320-
Microsphere 12,56,9the 5.77,7
The dielectric constant at a frequency of 1010Hz2,532,63,2-3,32,45
Density g/cm30,8960,9251,1680,987

Introduction to epoxy resin of glass hollow microspheres reduces its density from 1.16 to 0,987, a dielectric constant of from 4.8 to 2.45 (composition No. 4).

Of the composite dielectric material with a desired dielectric constant and density were made, in particular, the lenses on the following technology.

Preparation of composite dielectric material:

1. To warm the epoxy resin ED - 16 to a temperature (120±10)°C for 1 h

2. The titanium dioxide to dry on a metal baking sheet with a layer of 2 to 3 cm at a temperature of from 110 to 120°C for 3.0 to 3.5 h and cooled at room temperature.

3. Sift 0.05 and be dumped in a tightly closed container made of aluminum, tin or glass. To use dried titanium dioxide during the month. After a month of drying the titanium dioxide repeat step 2.

4. Dry the microsphere at a temperature of 70°C for 2 hours

5. Weighing of components according to the recipe (except PET), mix thoroughly for 10-15 m is N.

6. The resulting mixture was warmed at a temperature of 80°C for 1 h Then the mixture was ovakwanyama at a temperature of from 65 to 75°and a residual pressure of from 5 to 10 mm Hg until the termination of the active selection of bubbles.

Otakuminopera the mixture to cool to a temperature of (25±10)°and enter the polyethylenepolyamine with uniform stirring.

Vacuuming composite dielectric material at a residual pressure of from 5 to 10 mm Hg no more than 10 minutes, considering the viability of a compound.

7. The viability of the prepared composite dielectric material is not more than 40 minutes depending on the ambient temperature: (25±10)°C.

8. After preparation of the composite dielectric material to produce die-casting products.

The shading of the lenses of the composite dielectric material:

1. Degrease the form spontaneously mixture using Basiago swab or brush.

2. Dried at a temperature of 25±10°With not less than 30 minutes and cover with grease SKT (synthetic rubber is from 5 to 10 parts by weight, toluene from 95 to 90 parts by weight) or "Paintoy - 107". "The Penta - 107" to dry at a temperature of (25±10)°With no more than 45 minutes

3. Form to stand in the air for 15-20 minutes Apply a second layer of grease SKT. The form is covered with a second layer of grease to put in thermostat and left for 2 h at same time is the temperature value 180° C. Then cooled to room temperature.

4. To produce fill in the form, after you come out all air bubbles to close the form.

5. To sustain the shape in the air at a temperature of (25±10)°C for 3 h, and then at a temperature of (60±10)°C for 6 hours

6. Extract the product with the form from the oven and allow to cool.

7. To parse the form, retrieve the item and remove the Burr.

8. Parts made of composite dielectric material to mechanical or climatic tests to withstand under normal conditions for 24 h, not less.

Next lenses tested on climatic aging according to GOST 9.707-81 "polymeric Materials. Accelerated tests in the climatic ageing. Test the impact of negative temperature, simulating one year of storage products in any climatic region, was held in the mode:

the extract at -20°30 min;

the extract at a temperature of -60° - 6 hours;

the extract at a temperature of +20° - 1 hour.

Conducted simulation 7 years of storage.

Test the effects of temperature extremes, simulating one year of storage in any climatic region, was held in the mode:

the extract at a temperature of -60° - 2 hours;

the extract at a temperature of +85° - 2 hours.

Just spent 12 cycles - imitaz what I am 12 years of storage.

Test moisture resistance within 10 days at a temperature of 55±2°C and relative humidity of 98 to 100%.

After testing the lens in appearance has not changed, cracks, no chips, the size of the lenses geometrically unchanged.

With lenses made of composite dielectric material has been collected antennas and tested:

1. Cyclic change of temperature from -60°to +85°aged for 2 hours at each temperature, only 5 cycles.

2. On thermal stability with time at temperature +85°2 hours, and then aged at a temperature of 100° - 10 minutes

3. The moisture resistance at a temperature of +40°C and relative humidity of 98% within 10 days.

4. Mechanical testing of antennas:

a) on the impact of broadband random vibration.

Frequency range, HzThe spectral density of vibration in the whole range, m2/s4Hz (g2/Hz)Srednekwadrati the value of the total acceleration, m/s2(g)Time, h
20-2000Across the range, linear147 (15)20

Test in three positions with a uniform breakdown of total time of 20 hours;

b) on the effects of mechanical shock of single action.

Peak shock acceleration, m/s2(g)The duration of shock acceleration, MSThe number of strokes in each direction
1470 (150)2-63

Test in three positions;

C) on the effects of mechanical shock of repeated action.

Peak shock acceleration, m/s2(g)The duration of shock acceleration, MSThe total number of strokes on three axes
740 (75)5-104000

Test in three positions with a uniform spacing, the total number of shock - 4000.

5. Cyclic change of temperature from -60°to +85°aged for 2 hours at each temperature, only 5 cycles.

After each test control is performed in appearance.

6. After the climatic and mechanical testing was conducted inspection station reserve fuel facility antennas.

Antenna with the inventive composite dielectric material of lenses, meet the technical requirements of the product.

Thus, as is confirmed by the results of experiments and tests have solved the task and achieved the required technical result is at. The use of composite dielectric material, for example, for the manufacture of the lens is allowed to provide a predetermined dielectric constant and density, and performance under vibration loads in the temperature range from -60 to +85°C.

1. Composite dielectric material containing a polymeric binder material is epoxy resin and the filler is titanium dioxide and microspheres, characterized in that it contains glass microspheres are hollow and made with the following ratio of components, wt.%:

epoxy74,3-82,8
hollow glass microspheres5,7-12,5
titanium dioxideRest

2. Antenna lens, characterized in that it is made of composite dielectric material according to claim 1.



 

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