JP5414353B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device that realizes stealth of its own antenna by transmitting a signal from its own antenna and attenuating signals from other radars.

  Conventionally, as an antenna device having a radome having a stealth function, a plurality of element antennas arranged on a plane, and a module circuit (feed circuit or phase shifter, etc.) that distributes and combines high-frequency signals to each element antenna ) And an array antenna apparatus including a radome disposed around the array antenna has been proposed (see, for example, Patent Document 1).

  In the array antenna device described in Patent Document 1, a plurality of frequency selection elements inserted in a dielectric layer constituting a radome excites a resonance action or an anti-resonance action for a specific frequency. Thus, since the radome portion functions as a bandpass filter (or band rejection filter) having a narrow band characteristic, a signal having a desired frequency can be transmitted and a signal having another frequency can be reflected. Therefore, the radar cross section of the array antenna device cannot be known from other radars.

Japanese Utility Model Publication No. 5-4609

  However, in the conventional antenna apparatus, when the frequency band of the signal of the own antenna which is a signal of a desired frequency body is the same as the frequency band of the signal of another radar, the signal of the other radar is removed. Therefore, there is a problem that the radar cross section of the own antenna device is detected by another radar.

  The present invention has been made to solve the above-described problems, and even if the frequency band of the signal of another radar is the same as the frequency band of the signal of the own antenna, it is An object of the present invention is to obtain an antenna device in which the radar cross section of the own device antenna is not detected and the communication of the own device antenna is not hindered.

An antenna device according to the present invention includes an array antenna and a radome disposed above the array antenna. The array antenna includes a plurality of element antennas arranged on a plane, and a high-frequency signal distribution to the plurality of element antennas. And a module circuit that performs synthesis, the radome has a different transmission phase depending on the position, and the module circuit allows the transmission signal from the element antenna to be aligned with the wave front after transmission through the radome. The radome is configured to include a substrate and a plurality of conductor patches formed on the substrate, and the plurality of conductor patches are at least at an operating frequency. Having a dimension of one wavelength or less and being arranged at predetermined intervals on the first and second surfaces of the substrate; Made from structure disposed symmetrically about a plurality of conductor patch or substrate is one that has a different structure depending on the plane position of the radome.

  According to the present invention, even when the frequency band of the signal of the other radar is the same as the frequency band of the signal of the own antenna, the radar cross section of the own antenna is not detected by the other radar, and It is possible to realize an antenna device that does not interfere with the communication of the machine antenna, and to achieve stealth of the antenna device.

It is a block block diagram which shows the antenna apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows operation | movement when a signal injects into the antenna apparatus of FIG. It is explanatory drawing which shows the operation | movement in the case of transmitting a signal from the antenna apparatus of FIG. It is a block block diagram which shows the antenna apparatus which concerns on Embodiment 2 of this invention. It is the side view and top view which expand and show the radome in FIG. It is a perspective view which shows the single antenna model for demonstrating the transmission phase of the radome which comprises the antenna apparatus of FIG. It is explanatory drawing which shows the analysis result of the transmission phase at the time of changing the magnitude | size of the conductor patch 6 in the single antenna model of FIG. It is a block block diagram which shows the antenna apparatus which concerns on Embodiment 3 of this invention. It is the side view and top view which expand and show the radome in FIG. It is a block block diagram which shows the antenna apparatus which concerns on Embodiment 4 of this invention. It is the side view and top view which expand and show the radome in FIG. It is a block block diagram which shows the antenna apparatus which concerns on Embodiment 5 of this invention. It is the side view and top view which expand and show the radome 1 in FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an antenna apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the antenna device includes a radome 1, a plurality of element antennas 2, a module circuit 3 having a transfer device, and a power feeding circuit 4.

The radome 1 is divided into a plurality of sections (four sections in FIG. 1), and each transmission phase is different from each other according to the position of the radiation surface of the antenna device.
The plurality of element antennas 2 are arranged so as to face each divided section of the radome 1.

Next, the operation of the antenna apparatus according to Embodiment 1 of the present invention shown in FIG. 1 will be described with reference to FIGS.
2 is an explanatory diagram showing an operation when a signal is incident on the antenna device of FIG. 1, and FIG. 3 is an explanatory diagram showing an operation when a signal is transmitted from the antenna device (a plurality of element antennas 2) of FIG. FIG.

First, consider a case where a signal from another radar enters the antenna apparatus of FIG.
In FIG. 2, it is assumed that an incident signal 10 from the outside (radar) (wavefronts 11 are aligned as indicated by a broken line) passes through the radome 1.
At this time, since the transmission phase of the radome 1 is different depending on the position, the wave front 13 (see the broken line) of the incident signal 12 after passing through the radome 1 is different from each other depending on the passing position of the radome 1. There is no.

Therefore, the signal intensity of the signal reaching the element antenna 2 is reduced, and the signal intensity of the signal reflected by the element antenna 2 is also reduced.
As a result, it is possible to prevent the radar cross section of the own antenna device from being detected by another radar.

Next, consider a case where signals are transmitted from a plurality of element antennas 2.
In FIG. 3, when the transmission signal 20 is emitted from the own antenna device, the plurality of element antennas 2 have different wavefronts 21 (see broken lines) of the transmission signal 20 under the control of the module circuit 3 in advance.

That is, the plurality of element antennas 2 emit the transmission signal 20 while changing the phase so that the wave fronts 23 (see broken lines) of the transmission signal 22 after passing through the radome 1 are aligned.
Accordingly, the transmission signals 20 from the plurality of element antennas 2 can be transmitted without lowering the signal intensity because the wave front 23 is aligned with the transmission signal 22 after passing through the radome 1.

As described above, the antenna apparatus according to Embodiment 1 of the present invention includes the array antenna and the radome 1 disposed on the top of the array antenna, and the array antenna includes a plurality of element antennas arranged on a plane. 2 and a module circuit 3 that distributes and synthesizes high-frequency signals to a plurality of element antennas 2, and the radome 1 is set so that the transmission phase differs depending on the position.
Further, the module circuit 3 controls the transmission signal from the element antenna 2 so as to have different phases depending on the position of the radome 1 so that the wave front 23 is aligned after passing through the radome 1.

  As a result, even if the frequency band of the signal of the other radar is the same as the frequency band of the signal of the own antenna, the radar cross section of the own antenna is not detected by the other radar, and An antenna device that does not hinder communication can be realized, and the antenna device can be made stealth.

Embodiment 2. FIG.
In the first embodiment (FIG. 1), a specific configuration for making the transmission phase of the radome 1 different for each position is not mentioned, but it differs for each position of the radome 1, for example, as shown in FIG. A plurality of conductor patches 6 may be provided so as to form a pattern.

4 is a block diagram showing an antenna apparatus according to Embodiment 2 of the present invention, and FIG. 5 is an enlarged side view and plan view showing the radome 1 in FIG.
4 and 5, the same components as those described above (see FIG. 1) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted.

In this case, the radome 1 is composed of a substrate 5 made of a dielectric or the like and a plurality of conductor patches 6 provided on the substrate 5.
The plurality of conductor patches 6 are arranged one-dimensionally or two-dimensionally at predetermined intervals on the first surface (upper surface) and the second surface (back surface) of the substrate 5, and are symmetric with respect to the substrate 1. Is arranged.
Each conductor patch 6 has a dimension of one wavelength or less at least at the operating frequency, and is arranged so that the size (width) w varies depending on the planar position on the radome 1 as shown in FIG. Has been.

Next, the operation of the antenna device according to Embodiment 2 of the present invention shown in FIGS. 4 and 5 will be described with reference to FIGS.
Since the operation of the antenna device is the same as that of the first embodiment, it will be omitted here and the operation of the radome 1 will be described.

FIG. 6 is a perspective view showing a single antenna model for explaining the transmission phase of the radome 1 (see FIG. 5) constituting the antenna apparatus of FIG.
FIG. 7 is an explanatory diagram showing a transmission phase analysis result when the size of the conductor patch 6 is changed in the single antenna model of FIG.

In FIG. 6, conductor patches 6 having the same size (vertical and horizontal width w) are two-dimensionally arranged on the first surface and the second surface of the substrate 5 at a predetermined interval.
As a result, the transmission phase at the radome 1 when a signal is transmitted from the transmission point P 1 and transmitted through the radome 1 and then received at the reception point P 2 changes according to the size of the conductor patch 6.

FIG. 7 shows the transmission phase [deg] when the size (width w) of the conductor patch 6 is set to 5 mm × 5 mm, 6 mm × 6 mm, and 6.5 mm × 6.5 mm.
As can be seen from FIG. 7, for example, when the frequency is 10 GHz, the transmission phase decreases as the size (width w) of the conductor patch 6 increases. Therefore, the transmission phase can be changed depending on the size of the conductor patch 6. It becomes.
Therefore, by configuring the radome 1 as shown in FIG. 5, it is possible to change the transmission phase in the radome 1 according to the plane position in a specific frequency band (for example, 10 GHz).

As described above, the radome 1 of the antenna device according to the second embodiment (FIG. 5) of the present invention includes the substrate 5 and the plurality of conductor patches 6 formed on the substrate 5.
The plurality of conductor patches 6 have dimensions of one wavelength or less at least at the operating frequency, are arranged at predetermined intervals on both surfaces (first and second surfaces) of the substrate 5, and are arranged symmetrically with the substrate 5 in between. The width w (dimension) of the plurality of conductor patches 6 is set to be different depending on the planar position of the radome 1.

  Thus, as described above, even when the frequency band of the signal of the other radar is the same as the frequency band of the signal of the own antenna, the radar cross-section of the own antenna is not detected from the other radar. In addition, it is possible to realize an antenna device that does not interfere with the communication of the own antenna, and the antenna device can be made stealth.

Embodiment 3 FIG.
In the second embodiment (FIG. 5), the width w of the plurality of conductor patches 6 is set to be different depending on the planar position of the radome 1. However, as shown in FIG. The distance d between adjacent ones may be set differently depending on the planar position of the radome 1.

8 is a block diagram showing an antenna device according to Embodiment 3 of the present invention, and FIG. 9 is an enlarged side view and plan view showing the radome 1 in FIG.
8 and 9, the same components as those described above (see FIG. 5) are denoted by the same reference numerals as those described above and will not be described in detail.
In this case, the plurality of conductor patches 6 formed on the radome 1 are arranged such that the distance d between the adjacent conductor patches 6 differs according to the planar position of the radome 1.

Next, the operation of the radome 1 according to the third embodiment of the present invention shown in FIGS. 8 and 9 will be described.
The transmission phase of the radome 1 can be changed by changing the distance d between the adjacent conductor patches 6.

  Therefore, by configuring the radome 1 as shown in FIG. 9, the transmission phase at the radome 1 can be changed according to the plane position at a specific frequency (for example, 10 GHz) as described above. .

As described above, the radome 1 of the antenna device according to Embodiment 3 (FIG. 8) of the present invention includes the substrate 5 and the plurality of conductor patches 6 formed on the substrate 5, and includes a plurality of conductor patches. 6 has a dimension of one wavelength or less at least at the operating frequency, and is arranged at predetermined intervals on both surfaces (first and second surfaces) of the substrate 5 and is symmetrically disposed with the substrate 5 interposed therebetween. Thus, the distance d between adjacent ones of the plurality of conductor patches 6 is set to be different depending on the planar position of the radome.
Thereby, there can exist an effect similar to the above-mentioned.

Embodiment 4 FIG.
In the second and third embodiments (FIGS. 5 and 8), the width w or the adjacent distance d of the plurality of conductor patches 6 is set to be different depending on the planar position of the radome 1, but in FIG. As described above, the thickness t of the substrate 5 may be set to be different depending on the planar position of the radome 1.

FIG. 10 is a block diagram showing an antenna apparatus according to Embodiment 4 of the present invention, and FIG. 11 is an enlarged side view and plan view showing the radome 1 in FIG.
10 and 11, the same components as those described above (see FIGS. 5 and 8) are denoted by the same reference numerals as those described above and will not be described in detail.

In this case, the substrate 5 constituting the radome 1 is set so that the thickness t varies depending on the planar position of the radome 1.
On the other hand, as shown in FIG. 11, the plurality of conductor patches 6 are all arranged at the same predetermined interval regardless of the position of the radome 1.

Next, the operation of the radome 1 according to the fourth embodiment of the present invention shown in FIGS. 10 and 11 will be described.
The transmission phase of the radome 1 can be changed by changing the thickness t of the substrate 1.

  Therefore, by configuring the radome 1 as shown in FIGS. 10 and 11, the transmission phase at the radome 1 can be changed according to the plane position at a specific frequency (for example, 10 GHz).

As described above, the radome 1 of the antenna device according to Embodiment 4 (FIG. 10) of the present invention includes the substrate 5 and the plurality of conductor patches 6 formed on the substrate 5, and includes a plurality of conductor patches. 6 has a dimension of one wavelength or less at least at the operating frequency, and is arranged at predetermined intervals on both surfaces (first and second surfaces) of the substrate 5 and is symmetrically disposed with the substrate 5 interposed therebetween. Thus, the thickness t of the substrate 5 is set to be different depending on the planar position of the radome 1.
Thereby, there can exist an effect similar to the above-mentioned.

Embodiment 5 FIG.
In the fourth embodiment (FIG. 10), the thickness t of the substrate 5 is set to be different depending on the planar position of the radome 1, but as shown in FIG. The radome 1 may be set differently depending on the planar position of the radome 1.

12 is a block diagram showing an antenna apparatus according to Embodiment 5 of the present invention, and FIG. 13 is an enlarged side view and plan view showing the radome 1 in FIG.
12 and 13, the same components as those described above (see FIG. 10) are denoted by the same reference numerals as those described above and will not be described in detail.

  In this case, the substrate 5 constituting the radome 1 is set so that the relative dielectric constant differs depending on the planar position of the radome 1. Here, the difference in relative permittivity is conceptually shown by the light and dark tones of each block of the radome 1.

Next, the operation of the radome 1 according to the fifth embodiment of the present invention shown in FIGS. 12 and 13 will be described.
The transmission phase of the radome 1 can be changed by changing the relative dielectric constant of the substrate 5.
Therefore, by configuring the radome 1 as shown in FIG. 12 and FIG. 13, it is possible to change the transmission phase at the radome 1 according to the plane position at a specific frequency (for example, 10 GHz).

As described above, the radome 1 of the antenna device according to Embodiment 5 (FIG. 12) of the present invention includes the substrate 5 and the plurality of conductor patches 6 formed on the substrate 5, and includes a plurality of conductor patches. 6 has a dimension of one wavelength or less at least at the operating frequency, and is arranged at predetermined intervals on both surfaces (first and second surfaces) of the substrate 5 and is symmetrically disposed with the substrate 5 interposed therebetween. Thus, the relative dielectric constant of the substrate 5 is set to be different depending on the planar position of the radome 1.
Thereby, there can exist an effect similar to the above-mentioned.

  1 radome, 2 element antenna, 3 module circuit, 4 feeder circuit, 5 substrate, 6 conductor patch, 10 incident signal, 11 wavefront of the incident signal, 12 incident signal after passing through the radome, 13 wavefront of incident signal after passing through the radome, 20 transmission signal, 21 wavefront of transmission signal, 22 transmission signal after transmission, 23 wavefront of transmission signal after transmission of radome, P1 transmission point, P2 reception point, d distance between conductor patches, t thickness of substrate, w The width (size) of the conductor patch.

Claims (4)

An array antenna,
A radome disposed on top of the array antenna; and
The array antenna is
A plurality of element antennas arranged on a plane;
In an antenna device configured by a module circuit that distributes and combines high-frequency signals to the plurality of element antennas,
The radome has a different transmission phase depending on the position,
The module circuit is an antenna device that controls a transmission signal from the element antenna so that wavefronts are aligned after passing through the radome so that the phase is different depending on the position of the radome,
The radome is composed of a substrate and a plurality of conductor patches formed on the substrate,
The plurality of conductor patches are:
Having a dimension of one wavelength or less at least at the operating frequency;
It is arranged on the first and second surfaces of the substrate at a predetermined interval, and has a structure arranged symmetrically across the substrate,
Said plurality of conductor patches or said substrate, wherein a to luer antenna apparatus that has a different structure depending on the planar position of the radome.   The antenna device according to claim 1, wherein dimensions of the plurality of conductor patches are different according to a planar position of the radome.   The antenna apparatus according to claim 1, wherein a distance between adjacent ones of the plurality of conductor patches varies depending on a planar position of the radome.   The antenna device according to claim 1, wherein the thickness of the substrate varies depending on a planar position of the radome.

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