KR101054733B1 - Antenna hat device for radio communication test of projectile - Google Patents

Abstract

According to the present invention, an antenna hat apparatus for a radiocommunication test of a projectile, which is installed on the mounting surface of the projectile, has a space portion having a predetermined size therein, and the space portion has a metal material in which an inverse F antenna is located. Antenna hat body; A coupling probe positioned in the space part and coupling an electromagnetic field component radiated from the inverse F antenna to an output port; An EMI gasket positioned between the mounting surface and the antenna hat body and absorbing electromagnetic waves radiated from the inverted F antenna to reduce leakage to the outside; Located on one side of the antenna hat body, one side is provided with a fixing portion for pressing one side of the antenna hat body so that the antenna hat body is fixed to the mounting surface, the other side is fixed coupling with the mounting surface Disclosed is an antenna hat apparatus including a fixing jig provided with an adhesive member.

According to the disclosed antenna hat device, it is not necessary to separate the mounting antenna and the radio transceiver during the radio communication test, thereby providing an effect capable of comprehensive end-to-end testing of the projectile RF system.

Inverted antenna, EMI, projectile

Description

Antenna Hat Apparatus for Radio Communication Test of Launch Vehicles

The present invention relates to an antenna hat apparatus for a radiocommunication test of a projectile, and more particularly, to a radio system communication test of an RF system level, including a radio transceiver and an inverted-F antenna mounted on a projectile. The present invention relates to an antenna hat device that links the ground inspection equipment (ground station) and the payload system to perform stably.

Conventionally, as a method for checking the RF performance of a radio transceiver mounted on a projectile, the mounting antenna connected to the radio transceiver is separated from the radio transceiver, and then the measurement device and the radio transceiver are directly connected without an inverted antenna. By connecting, only the performance check of the wireless transceiver could be performed.

This is because the radio transceiver mounted on the projectile may be harmful to a human body because high frequency electromagnetic waves are inputted and outputted through the inverted F antenna, and may be affected by the surrounding radio wave environment, thereby causing signal fluctuations.

Therefore, since the test of the wireless transmission / reception system including the inverse F antenna could not be performed, it was not possible to confirm the state of the inverse F antenna connection with the wireless transceiver.

In addition, the projectile is typically assembled in a structure in which several stages are stacked, and each stage is individually assembled and then totally assembled in an interior of an assembly building located at a point where the projectile is launched, and then integrated until the stage is launched. Mechanical and electrical performance tests.

However, when the projectile is totally assembled in the assembly building and has one projectile form, the RF signal measurement between the base transceiver station and the base station can be normally performed outside the assembly building (outdoor). When the projectile is located inside the assembly building (indoor), there is a problem that accurate RF signal measurement is impossible due to the influence of the radio wave environment inside the assembly building.

Therefore, a radio wave communication test method of a radio transceiver comprising an inverted F antenna with the projectile located in an assembly building, wherein a relay antenna is located between the radio transceiver and the base station, and the radio transceiver and the base station are located. Although it is possible to test the state of radio wave communication with the radio wave, the fluctuation of the RF signal may occur due to the influence of the surrounding radio wave environment of the relay antenna, which may occur during the test. There was a problem in that accurate diagnosis was impossible when abnormalities occurred in characteristics.

In addition, in the case of the conventional satellite antenna hat device, a rubber-shaped absorber is applied to the inner wall of the antenna, and another type of coupling antenna is disposed therein, whereby the antenna hat body device is radiated from the mounting antenna. The method of coupling only the in-band radiated signal as an infinite boundary condition without affecting electromagnetic waves has been applied.

However, in addition to the antenna, the outer surface of the projectile is equipped with several structures such as a thruster, a separate antenna, an umbilical connector, and a mounting camera, so physical and electrical performance interference with these structures must be avoided. There are many problems in the antenna hat size and mounting method.

In addition, since the conventional antenna hat device for satellite has absorption conditions as boundary conditions, if the antenna hat inner wall (wave absorber) and the mounted antenna are installed in close proximity, the effect of the radio wave absorber does not show much, and the radio wave The reflected wave reflected from the absorber affects the mounted antenna, which causes the resonance frequency of the antenna to move and the insertion loss increases.

Therefore, since the radio wave absorber and the on-board antenna are separated from each other by a predetermined distance or more so as not to be affected by the reflected wave, the RF hat can be measured normally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the RF cabling condition between an internal device of the projectile and an inverted-f antenna mounted on the projected body in a comprehensive linkage test of the projectile RF system in an interior of an assembly building in which a projectile is totally assembled. The purpose is to provide an antenna hat device that does not change the environment and provides a test environment that is not affected by surrounding radio interference environment.

An antenna hat apparatus according to the present invention for achieving the above object, in the antenna hat apparatus for radiocommunication communication test of the projectile, is installed on the mounting surface of the projectile, there is provided a space having a constant size therein, The space portion includes a metal antenna hat body in which the inverted F antenna is positioned; A coupling probe positioned in the space part and coupling an electromagnetic field component radiated from the inverse F antenna to an output port; An EMI gasket positioned between the mounting surface and the antenna hat body and absorbing electromagnetic waves radiated from the inverted F antenna to reduce leakage to the outside; Located on one side of the antenna hat body, one side is provided with a fixing portion for pressing one side of the antenna hat body so that the antenna hat body is fixed to the mounting surface, the other side is fixed coupling with the mounting surface It includes; a fixing jig provided with an adhesive member.

Here, the reverse F antenna may be further provided with a guide block for supporting the outer surface of the antenna to be fixedly installed in the space portion.

In addition, the EMI gasket is located between the mounting surface and the antenna hat body, the pressure gasket is installed between the mounting surface and the antenna hat body by the pressing force of the fixing portion, the mounting surface and the It may be provided to block the spaced space between the antenna hat body.

In addition, the antenna hat body may be provided in a state in which the shape of the contact surface of the antenna hat body in contact with the mounting surface corresponds to the shape of the outer surface of the mounting surface.

In addition, the coupling probe is located inside the space portion, using the EM simulation technique, the installation position (D) and the installation height (H) of the coupling probe in the space portion, and the coupling The length L and the width W of the probe can be determined.

According to the antenna hat device for radio wave communication test of the projectile according to the present invention,

First, the radiocommunication test conducted inside the assembly building, a space where the projectile is assembled and waiting, does not change the RF cabling condition between the internal device of the projectile and the inverted F antenna, It provides a test environment that is not affected, so that reliable measurement data can be obtained.

Second, since it is not necessary to separate the inverted-f antenna and the radio transceiver mounted on the radio communication test, a comprehensive linkage test (end-to-end) of the projectile RF system provides an effect.

Third, since the electromagnetic wave of high power harmful to the human body does not leak to the outside during the radio communication test, there is an advantage of providing a safe radio communication test environment to the user.

Fourth, since the size of the module (coupling probe) mounted inside the antenna hat device is optimized and installed, the antenna hat device can be manufactured in a small size and a lightweight aluminum material can form the antenna hat body. Easy to install and remove

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

Figure 1a is a cross-sectional perspective view showing the configuration of the antenna hat device according to an embodiment of the present invention, Figure 1b is a side view showing the configuration of the antenna hat device of Figure 1a, Figure 2 is a projectile of the projectile RF system in the state of the total assembly Schematic diagram showing the state of RF radiocommunication test system for the end-to-end test.

3A to 3C are photographs of the external appearance of the antenna hat apparatus applied to the S-band of FIG. 2, and FIGS. 4A to 4C are photographs of the external appearance of the antenna hat apparatus applied to the C-band of FIG. 5a to 5c are photographs of the external appearance of the antenna hat apparatus applied to the UHF-band of FIG.

4A, 5A, and 6A are photographs of the overall appearance of the antenna hat apparatus, and FIGS. 4B, 5B, and 6B are photographs of the exterior of the antenna hat body of the antenna hat apparatus. 4C, 5C, and 6C are photographs of the internal shape of the antenna hat body of the antenna hat apparatus.

6 is an S-parameter waveform measured by a network analyzer for the antenna hat device mounted on the S-band of FIG. 2, and FIG. 7 is an S-measured by a network analyzer for the C-band antenna hat device of FIG. It is a parametric waveform, and FIG. 8 is an S-parameter waveform measured by a network analyzer for the UHF-band antenna hat device of FIG.

1A and 1B, the antenna hat apparatus 100 according to the embodiment of the present invention includes an antenna hat body 110, a coupling probe 120, an EMI gasket 130, and a fixture 140. ) And guide block 150.

The antenna hat body 110 is installed on the mounting surface of the projectile 200, there is provided with a space portion 111 having a predetermined size therein, the inverted F antenna 160 in the space portion 111 Metal body of the metallic material to be located.

1A and 1B, the antenna hat body 110 may have an outer structure covering and enclosing the inverted F antenna 160 as a whole, and the mounting surface may include the antenna hat device 100 of the present invention. Means a part of the outer surface of the projectile 200 is mounted.

In addition, the inverted F antenna 160 includes a radome 161 and a radiating element 162. One side of the radiating element 162 is connected to an RF performance checking device such as a network analyzer. It is provided to be combined with.

In addition, the material forming the antenna hat body 110 may be made of a metal material, but may be formed of an aluminum material that is light in weight and easy to process.

In addition, the antenna hat body 110 may be provided in a state where the contact surface of the antenna hat body 110 in contact with the mounting surface is deformed in correspondence to the shape of the outer surface of the mounting surface.

This is generally formed as a cylindrical shape of the projectile 200, the outer surface of the projectile 200 will have a radius of curvature. Therefore, the shape of the contact surface of the antenna hat body 110 mounted on a portion of the outer surface of the projectile 200 is determined so that the contact surface is in close contact with the outer surface in consideration of the radius of curvature of the outer surface. .

The coupling probe 120 is located inside the space 111, and functions to couple the electromagnetic field radiated from the inverted F antenna 160 to the second port 146 as much as possible. In addition, one side of the coupling probe 120 is provided to be coupled to the second port 146 which is connected to the RF performance checking equipment such as a network analyzer.

Here, the coupling probe 120 is installed at the mounting position (D) and the mounting height (H) to be mounted inside the space 111, and the length (L) and width (W) of the coupling probe. Accordingly, the characteristics of coupling the electromagnetic field components will vary.

Therefore, in the present invention, the size of the installation position (D), installation height (H), length (L) and width (W) of the coupling probe 120 is optimized by utilizing a commercially available EM simulation tool. It is provided to be determined.

When the specification of the coupling probe 120 is determined using the EM simulation tool, the return loss of the inverted F antenna 160 itself is not changed within the use band regardless of whether the antenna hat is mounted or not. The insertion loss after the hat apparatus 100 is mounted also exhibits excellent characteristics. In addition, since accurate physical properties (dielectric constant, electrical conductivity) can be used, more accurate simulation can be applied, so that optimization can be realized, and miniaturization and efficient design can be realized.

The EMI gasket 130 is positioned between the mounting surface of the projectile 200 and the antenna hat body 110, and absorbs electromagnetic waves radiated from the inverted F antenna 160 to externally. It serves to reduce the leakage of furnace.

In general, the outer surface of the projectile 200 on which the antenna hat body 110 is mounted is made of a metal material of solid material, and the antenna hat body 110 is also formed of a metal material such as aluminum as described above. Therefore, even if the shape of the contact surface of the antenna hat body 110 in contact with the mounting surface between the mounting surface and the antenna hat body 110 is made in consideration of the shape of the outer surface of the projectile 200, a minute gap This can happen.

In addition, the RF signal input and output through the inverted F antenna 160, the signal is affected by the surrounding radio wave environment that can be introduced through the minute interval, which is a spaced space between the mounting surface and the antenna hat body 110, The shaking may occur, and RF signals of high power may leak through the minute intervals.

Therefore, in the antenna hat apparatus 100 of the present invention, the EMI gasket 130 is provided on the contact surface of the antenna hat body 110 in contact with the mounting surface.

The EMI gasket 130 absorbs electromagnetic waves radiated from the inverted F antenna 160 to reduce leakage to the outside, as well as the mounting surface and the antenna hat body by the pressing force of the fixing part 141 which will be described later. Installed in a pressurized state between the (110), it is provided to block the spaced space between the mounting surface and the antenna hat body (110).

Meanwhile, the fixing jig 140 is located at one side of the antenna hat body 110, and at one side thereof, one side of the antenna hat body 110 so that the antenna hat body 110 is fixed to the mounting surface. Fixing portion 141 is provided to press the other side, the other side is provided with an adhesive member 142 for fixed coupling with the mounting surface.

1A and 1B, the fixing jig 140 presses and fixes the antenna hat body 110 so that the antenna hat body 110 is fixedly installed on the mounting surface of the projectile 200. Function

To this end, one side of the fixing jig 140 is provided with a through-hole having a screw line formed therein, and the fixing unit 141 having a screw line corresponding to the screw line is formed on an outer surface thereof. Installed in interlocked state.

Accordingly, when the fixing part 141 rotates, the fixing part 141 is raised or lowered by the two screws. When the fixing part 141 is lowered, one end of the fixing part 141 is the antenna hat body 110. One side of the pressurization in the direction of the mounting surface of the projectile 200.

Here, the fixing part 141 and the through-hole are pressed to one side of the antenna hat body 110, the pressing force (pressure) is provided to be evenly applied to one side of the antenna hat body 110. Can be.

When the fixing part 141 is raised, the pressing force is released so that the antenna hat body 110 can be easily released from the projectile 200.

1A and 1B, a pressing force transmitted from one end of the fixing part 141 to one end of the fixing part 141 in contact with the fixing part 141 and the antenna hat body 110. The support 144 formed of an elastic material may be provided so that one side of the antenna hat body 110 is not deformed or damaged.

In addition, the support portion 144, the pressing force according to the rotation of the fixing portion 141 is transmitted to the antenna hat body 110, the support portion within a range that does not damage the outer surface of the antenna hat body 110 The strength and elastic modulus of the material 144 may have or the size of the area in contact with the antenna hat body 110 may be determined.

Here, in the antenna hat device 100 according to an embodiment of the present invention, the rotation of the fixing portion 141 and the screw thread of the fixing portion 141 as a means for pressing one side of the antenna hat body 110. It has been described as an example that the pressing force is generated by the engagement of the screw thread of the through hole and the like, but not limited to this, a mechanical pressurizing device capable of pressing and fixing one side of the pressing object used in the technical scope to which the present invention belongs. On the back, of course, it is possible to replace the configuration of the fixing portion 141 and the aperture of the present invention.

In the fixing jig 140 is fixed to the outer surface of the projectile 200, an adhesive member 142 is used on one side of the other side of the fixing jig 140, the adhesive member 142 is usually Double sided tape or adhesive may be used.

Here, a mechanical coupling member such as a bolt may be used to fix the fixing jig 140 and the projectile 200, but since this forms an unnecessary processing groove (bolt groove) on the outer surface of the projectile 200, The adhesive member 142 as described above may be used so that the antenna hat device 100 can be easily removed after the radiocommunication test of the projectile.

The guide block 150 supports the outer surface of the inverted F antenna 160 so that the inverted F antenna 160 is fixedly installed in the space 111.

3C, 4C, and 5C, the guide block 150 may be formed in various shapes according to the appearance of the inverted F antenna 160 mounted on the projectile 200. The inverted F antenna 160 may be provided to support the outer surface of the 160 to be fixedly positioned inside the antenna hat body 110.

On the other hand, in the conventional antenna antenna device for the satellite is mainly using a radio wave absorber on the entire inner wall of the hat body and coupling the signal emitted from the antenna to the internal antenna, the antenna hat is also required a relatively large size, there was an insertion loss of more than 10dB.

However, the antenna hat apparatus 100 of the present invention does not use a radio wave absorber depending on the constraints of the size of the antenna hat apparatus 100 mounted on the outer surface of the projectile and the mounting position of the antenna hat apparatus 100. In consideration of the electrical characteristics and the size of the antenna hat body 110, the mounting position and size of the coupling probe 120 is designed in an optimal form to maximize the coupling amount from the antenna and have a low insertion loss within 3dB. Can be implemented.

The coupling probe 120 has a relatively wide band characteristic by a gap coupling method to include all the resonance bandwidths of the conventional inverse F antenna.

2 is a schematic diagram showing a state in which the RF radiocommunication test system is configured for the end-to-end of the projectile RF system in a state where the projectile is totally assembled.

Referring to FIG. 2, the projectile 200 generally includes a telemetry system using an S-band 20Watt high power transmitter for RF wireless communication between ground stations 280 between flights, and a C-band peak power 400Watt radar transformer. RF systems such as a tracking radar system using a fader transceiver and a flight termination system using a UHF-band receiver are installed. For the radio communication test of each RF system, the inverted F antennas 220, 230, and 240 of each RF system are mounted. It is possible by measuring the RF signal transmission / reception status between receivers of each RF system, such as S-band telemetry receiving stations, C-band radars, and S-band flight termination transmitters located at ground station 280.

3A to 5C, the antenna hat body 110, the coupling probe 120, the EMI gasket 130, the fixing jig 140, and the guide block provided in the antenna hat device 100 are provided. The shape and size of the 150 may vary depending on the degree of the output size of the RF signal input and output to the inverted F antenna 160.

In general, as shown in FIG. 2, the projectile 200 is installed in the launch pad in a totally assembled state and waits in the building for assembly to perform mechanical and electrical performance tests before being launched. In this case, the visible distance with the ground station 280 (LOS; Line-of-Sight) is not secured, but the conventional RF performance test method was limited to perform the performance test of both the projectile and the ground station RF system, but using the antenna hat apparatus 100 of the present invention. In this case, the ground station 280 can be directly connected to the ground station 280 at the launch site before the launch. In the development test stage, the RF performance test can be efficiently performed by utilizing ground inspection equipment (ground station simulation equipment) in the building. Can be implemented.

Here, in order to measure each RF system of the S-band telemetry system, the C-band tracking radar system and the UHF-band flight termination system mounted on the projectile 200, as shown in Figure 2, each inverted F antenna (210, 220, 230) Each antenna hat device (240, 250, 260) is mounted to correspond to the mounting position.

Subsequently, in the S-band telemetry system, the spectrum analyzer and the ground check device are connected to the second port connected to the antenna hat device 240 to measure the output of the transmitter to measure the RF signal, and the C-band tracking radar. In the system and UHF-band flight termination system, the ground check device may be connected to each of the second ports connected to the antenna hat devices 250 and 260 to measure the RF signal.

6 is an S-parameter waveform measured by a network analyzer for an embodiment of the S-band antenna hat device 240, and FIG. 7 is a network analyzer for an embodiment of the C-band antenna hat device 250. FIG. S-parameter waveforms, and FIG. 8 is S-parameter waveforms measured with a network analyzer for an embodiment of UHF-band antenna hat device 260. In addition, Table 1 below is an RF signal performance test result table recording the numerical values of the S-parameter waveforms of FIGS.

6 to 8 and [Table 1], the reflection loss (S11, S22) and insertion loss (S12, 21) for each antenna hat device (240, 250, 260) is shown in the performance test results table of [Table 1] As a result, satisfactory results were obtained within the frequency band used in the VSWR 2: 1 range.

In particular, the return loss S11 is the return loss of the inverted F antennas 210, 220 and 230, and this graph is the same as the characteristic measured in the antennas 210, 220 and 230 itself in an infinite boundary condition in which the antenna hat devices 240, 250 and 260 are not attached.

In addition, insertion loss S21 and S12 show improved performance considering that the insertion loss of the existing antenna hat mainly developed for satellite testing is 10-20dB.

Antenna Hat Type

Measuring port
Frequency (MHz)
Return loss (dB)
Insertion loss (dB)
S-band
Antenna hat
(240)
1st port-to-2nd port
(S11, S21)

2,200-2,300
(100 MHz)
-12.5 max
-0.69 to 0.25
Second port-to-first port
(S22, S12)
-12.6 max
-0.76 to 0.21
C-band
Antenna hat
(250)
1st port-to-2nd port
(S11, S21)

5,400-5,700
(300 MHz)
-10.4 max
-1.7 to -1.2
Second port-to-first port
(S22, S12)
-11.0 max
-1.7 to -1.2
UHF-Band
Antenna hat
(260)
1st port-to-2nd port
(S11, S21)

430-435
(5 MHz)
-10.3 max
-2.2 to -1.9
Second port-to-first port
(S22, S12)
-10.7 max
-2.5 to -2.1

As described above, according to the antenna hat apparatus 100 according to the present invention, the radio cabling conditions between the projectile internal device and the mounting antenna are not changed during the comprehensive linkage test of the projectile RF system, and the surrounding radio interference environment It provides a test environment that is unaffected by the system, so that reliable measurement data can be obtained. In addition, it is possible to realize the effect that can be easily attached and detached without physical processing for fixing the antenna hat separately on the outer surface of the projectile.

Therefore, the antenna hat apparatus of the present invention is expected to be utilized in system level performance testing of projectiles, rockets, missiles, etc., equipped with reverse F antennas.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Figure 1a is a cross-sectional perspective view showing the configuration of an antenna hat device according to an embodiment of the present invention,

Figure 1b is a side view showing the configuration of the antenna hat device of Figure 1a,

2 is a state diagram showing a state in which the RF radiocommunication test system is configured in a state where the projectile is assembled;

Figure 3a to 3c is a photograph of the appearance of the S-band antenna hat device of Figure 2,

Figures 4a to 4c is a photograph of the appearance of the C-band antenna hat device of Figure 2,

5a to 5c is a photograph of the appearance of the UHF-band antenna hat device of Figure 2,

6 is an S-parameter waveform measured by a network analyzer for the antenna hat device mounted in the S-band of FIG.

7 is an S-parameter waveform measured by a network analyzer for the C-band antenna hat device of FIG.

FIG. 8 is an S-parameter waveform measured by a network analyzer for the UHF-band antenna hat device of FIG.

<Explanation of symbols for the main parts of the drawings>

100: antenna hat unit 110 ... antenna hat body

120 ... Coupling probe 130 ... EMI gasket

140 ... Fixed District 141 ... Government

142 ... Adhesive member 150 ... Guide block

Claims (5)

In the antenna hat device for the radio communication test of the projectile, An antenna hat body installed on a mounting surface of the projectile, having a space having a predetermined size therein, the space having a reverse F antenna; A coupling probe positioned in the space part and coupling an electromagnetic field component radiated from the inverse F antenna to an output port; An EMI gasket positioned between the mounting surface and the antenna hat body and absorbing electromagnetic waves radiated from the inverted F antenna to reduce leakage to the outside; Located on one side of the antenna hat body, one side is provided with a fixing portion for pressing one side of the antenna hat body so that the antenna hat body is fixed to the mounting surface, the other side is fixed coupling with the mounting surface An antenna hat device comprising a; fixing fixture provided with an adhesive member. The method of claim 1, And a guide block for supporting an outer surface of the inverted-f antenna so that the inverted-f antenna is fixedly installed in the space part. The method of claim 1, wherein the EMI gasket, Located between the mounting surface and the antenna hat body, is installed in a pressurized state between the mounting surface and the antenna hat body by the pressing force of the fixing portion, the separation between the mounting surface and the antenna hat body Antenna hat device, characterized in that provided to block the space. The method of claim 1, wherein the antenna hat body, Corresponding to the form of the outer surface of the mounting surface, the antenna hat device, characterized in that the contact surface of the antenna hat body in contact with the mounting surface is provided in a deformed state. The coupling probe according to any one of claims 1 to 4, wherein Located inside the space portion, using an EM simulation technique, the installation position (D) and the installation height (H) of the coupling probe in the space portion, the length (L) and width of the coupling probe An antenna hat apparatus, wherein (W) is determined.

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