KR101091929B1 - 40MHz band microstrip antenna - Google Patents

Abstract

The present invention relates to a 40 MHz band small microstrip antenna, comprising: a dielectric having air or a predetermined dielectric constant and formed between a ground plane and a radiating element; A ground plane performing a grounding function; And a first outer plate and a second outer plate, each of which extends a predetermined length perpendicularly in a predetermined direction at both ends of the ground plane, and at each end of the first outer plate and the second outer plate, toward the antenna center. A first fold portion and a second fold portion each extending in a predetermined length in parallel with the first fold portion, and at each end of the first fold portion and the second fold portion, parallel to the first outer plate and the second outer plate in an outward direction of the antenna A radiating element comprising a first inner plate and a second inner plate each of which extends a predetermined length vertically; Includes, characterized in that the feed point is located on any one of the first outer plate and the second outer plate, the radiating element, in the direction facing each other in the first inner plate and the second inner plate, respectively And a plurality of vertical plates that are staggeredly attached.

Microstrip antenna, omni-directional, perturbation, miniaturized, omni-directional

Description

40MHz band microstrip antenna {40MHz band microstrip antenna}

The present invention relates to a 40 MHz band small microstrip antenna, and more particularly, to a 1/4 wavelength vertical microstrip antenna in a 40 MHz (wavelength λ = 7.5 m) band for miniaturization to overcome mounting limitations. will be.

Many modern military facilities and materials are being developed in modern warfare, and communication in the jungle is also important. The most effective frequency band in the jungle is the 40 MHz band, and fast movement and accurate enemy tracking are key. Therefore, the antenna mounted on the tank for enemy tracking should be movable, and enemy tracking by the array should be possible regardless of the movement of the tank. For this purpose, the antenna must be miniaturized and omnidirectional characteristics are always required to cover the entire upper half. As described above, the tank-mounted antenna is the most important factor in miniaturization and omnidirectionality, and as the omnidirectional radiation pattern is required to enable enemy position tracking and communication at any position and at any posture, there is a demand for miniaturization of the antenna used. On the other hand, the size has a problem in miniaturization due to the characteristics due to the wavelength.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a characteristic object of providing a small microstrip antenna of 40 MHz band having a small size that can be mounted in a tank and having an omnidirectional radiation pattern.

The present invention for achieving the technical problem, air or a dielectric having a predetermined dielectric constant, formed between the ground plane and the radiating element; A ground plane performing a grounding function; And a first outer plate and a second outer plate, each of which extends a predetermined length perpendicularly in a predetermined direction at both ends of the ground plane, and at each end of the first outer plate and the second outer plate, toward the antenna center. A first fold portion and a second fold portion each extending in a predetermined length in parallel with the first fold portion, and at each end of the first fold portion and the second fold portion, parallel to the first outer plate and the second outer plate in an outward direction of the antenna A radiating element comprising a first inner plate and a second inner plate each of which extends a predetermined length vertically; Includes, characterized in that the feed point is located on any one of the first outer plate and the second outer plate, the radiating element, in the direction facing each other in the first inner plate and the second inner plate, respectively And a plurality of vertical plates that are staggeredly attached.

According to the present invention as described above, the possibility of mounting the tank was confirmed by miniaturizing the antenna of the center frequency 40MHz to the size, and obtained the omnidirectional radiation characteristics in the E, H-plane, respectively, through which the antenna has a non-directional radiation characteristics It confirmed that it was shown. As a result, the proposed antenna can be used as an antenna capable of tracking enemy positions in the jungle from a mobile chain tank.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. In the meantime, when it is determined that the detailed description of the known functions and configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description is omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Prior to the description of the structure and characteristics of the antenna according to the present invention, the miniaturization process of the antenna through the structural modification of the existing microstrip antenna will be described.

1A is a structure of a basic half-wavelength microstrip antenna. One wavelength of 40MHz is 7500mm and half wavelength is 3750mm. Therefore, the size of the half-wavelength microstrip antenna radiating element was determined to be 3750 mm wide x 3750 mm wide, and was adjusted to 3550 mm x 3750 mm wide for 40 MHz resonance. At this time, the distance between the radiating element and the ground plane was set to 200mm. This is determined at intervals of about 1/10 wavelength, which is set at about 1/20 wavelength intervals in consideration of the wavelength.

Subsequently, as shown in FIG. 1B, the size of the radiating element of the half-wavelength microstrip antenna is reduced to 1/4 wavelength, and one end is shorted to allow 40 MHz resonance. For actual resonance, the antenna is designed to be 1700mm wide x 1875mm long.

Next, the ground plane of the quarter-wavelength microstrip antenna was miniaturized to the size of the radiating element. As shown in FIG. 1C, as the size of the ground plane is reduced to the size of the radiating element, the overall size of the antenna is reduced, and the antenna has an omnidirectional radiation pattern due to the reduction of the ground plane. As a result, it is possible to derive the omni-directional radiation pattern which was one of the functional conditions of the antenna from the microstrip antenna.

Here, the size of the radiating element is 1720mm × 1875mm, which is rather longer than the size of the previous quarter-wavelength microstrip antenna, which is slightly longer than the size of the previous quarter-wavelength microstrip antenna. .

Later, the 1 / 4-wavelength microstrip antenna with reduced ground plane size was erected vertically. As can be seen in Figure 2a, the connected part for shorting in the quarter-wavelength microstrip antenna became a new ground plane. Using the folded structure and the perturbation effect on the 1/4 wavelength vertical microstrip antenna, the structure was modified as shown in FIG. 2B.

Fig. 2B shows the proposed antenna structure by applying the perturbation effect first, and it is possible to miniaturize the tank mounting size (within 600mm × 600mm × 600mm). The actual size is 600mm × 600mm × 540mm in height. This is the scale adjusted for resonance at 40 MHz.

The basic structure of the actually manufactured antenna is shown in FIG. 3. As shown in FIG. 2B, the ground plane size of the conventional quarter-wave microstrip antenna is reduced to the size of the radiating element, and the perturbation effect is used to close the weak electric field, and the strong electric field is far from the size. Further reduced. As a result, the antenna was miniaturized with a center frequency of 40 MHz to 600 mm x 600 mm x 595 mm in height (within λ / 12.5). Some modifications were made to the height above the size originally proposed to resonate the radiating element of the antenna at 40 MHz.

Hereinafter, a vertical microstrip antenna according to the present invention, that is, a 40 MHz band small microstrip antenna will be described with reference to FIGS. 3 to 7B.

40MHz band small microstrip antenna according to the present invention comprises a dielectric, ground plane (GND) and the radiating element (100).

Air or a dielectric having a predetermined dielectric constant (not shown) is formed between the ground plane GND and the radiating element 100.

In addition, the ground plane GND has a size of 600 mm by 600 mm in length, and provides a normal grounding function as a metal material. In this embodiment, the dielectric constant and shape of the dielectric may be set in various ways, but the present invention is not limited thereto. In addition, the ground plane may be set in various shapes, the present invention is not limited to the shape.

And, as shown in FIG. 3, the radiating element 100 includes a first outer plate 111 and a second outer plate each extending a predetermined length vertically in both directions of the ground plane GND in a predetermined direction (z-axis). 112 and a first fold portion 121 extending at a predetermined length in parallel to the ground plane GND in the antenna center direction at each end of the first outer plate 111 and the second outer plate 112. And the first outer plate 111 and the second outer plate 112 in the outward direction of the antenna at each end of the second folding part 122 and the first folding part 121 and the second folding part 122. The first inner plate 131 and the second inner plate 132 which extends a predetermined length vertically to be parallel to the ().

At this time, a feeding point (FP) is located at any one of the first outer plate 111 and the second outer plate 112. In the present embodiment, the first outer plate 111 is located. Feed points are also not limited to this.

4B is a graph illustrating a simulation result for examining impedance matching according to the separation distance h between the ground plane GND and the feed point FP according to the present invention. That is, as shown in FIG. 4A, the feed point FP is spaced apart from the ground plane GND at a predetermined interval, and the feed point may be adjusted within 20 mm to 40 mm for impedance matching. Simulation results show a 50-ohm match when 25 mm away from the ground plane.

In addition, Figure 5b is a graph showing a result of simulating a change in the resonance frequency according to the separation distance (d) between the radiating element, that is, the first inner plate 131 and the second inner plate 132 according to the present invention. That is, as shown in FIG. 5A, the separation distance d between the first inner plate 131 and the second inner plate 132 may be adjusted within 20 mm to 60 mm. At this time, it could be confirmed through simulation that the resonance frequency is lowered when the separation distance d approaches by the influence of the outermost electric field.

In the present embodiment, the separation distance h between the ground plane GND and the feed point FP is set to 25 mm, and the separation distance d between the first inner plate 131 and the second inner plate 132 is set. Although set to 40 mm, the present invention is not limited thereto.

Figure 6a is an exemplary view showing the size of the actual fabricated antenna of the 40MHz band small microstrip antenna according to the present invention, Figure 6b is a real picture of the 40MHz band small microstrip antenna according to the present invention, Figure 6c This is a graph showing the measurement results and simulation results of the return loss of the 40MHz band small microstrip antenna according to the present invention.

As shown in FIG. 6C, the center frequency has a size of 600 mm × 600 mm × 595 mm in height at 40.4 MHz. As a result of the measurement, the return loss is -24.9 dB and -10 dB bandwidth is 0.52 MHz (1.3%). The simulation results show that the return loss is -23.2dB and -10dB bandwidth is 0.16MHz (0.4%).

In other words, the return loss of the antenna showed that the simulation result and the measured result showed almost similar results. In addition, the -10dB bandwidth was about 0.16MHz (0.4%) in the simulation, and the actual measurement was increased to about 0.52MHz (1.3%). In actual measurements, although slightly increased, the -10dB bandwidth of the antenna was narrow in both cases. This is because the size of the antenna is too small for the wavelength. In addition, although the -10dB bandwidth showed a narrow characteristic, it was found that it covers about 500KHz bandwidth.

7A and 7B are graphs showing simulation results and actual measurement results of a radiation pattern of a 40 MHz band small microstrip antenna according to the present invention. As shown in FIG. 7A and FIG. 7B, omnidirectional radiation patterns in both an E-plane and an H-plane are shown. The measured results also showed omni-directionality in the E-plane.

In other words, the radiation pattern of E-plane and H-plane showed almost the same result as the radiation pattern confirmed in the simulation. In the E-plane, the omni-directional radiation pattern was somewhat level value at 90 and 270 degrees in H-plane. Although it was dropped, it was possible to check the omni-directionality by showing hemispherical radiation pattern in 0 and 180 degrees without null point.

In summary, the 40MHz band microstrip antenna proposed in the present invention has omnidirectional radiation characteristics through the omnidirectional radiation characteristics measured in the E-plane and the H-plane. It may be more useful for mounting the tank for tracking position.

Meanwhile, in the present invention, in order to manufacture a more miniaturized antenna, as shown in FIG. 8A, the plurality of vertical plates 141, 142, 143, and 144 are alternately arranged in a direction facing each other in the first inner plate 131 and the second inner plate 132. It was further miniaturized by attaching.

That is, among the plurality of vertical plates 141, 142, 143, and 144, the first vertical plate 141 and the third vertical plate 143 are vertically vertically extending from the second inner plate 132 toward the first inner plate 131. 2, the second vertical plate 142 and the fourth vertical plate 144 of the plurality of vertical plates 141, 142, 143, and 144 move in a direction from the first inner plate 131 to the second inner plate 132. The predetermined length extends vertically.

As a result, as shown in Figure 8b it is designed as 600mm × 300mm × 305mm in height, the reflection loss is shown in Figure 8c. In the present embodiment, as shown in Figures 8a and 8b, the number and length of the attached vertical plate is clearly shown, but the present invention is not limited thereto.

As described above and described with reference to a preferred embodiment for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described as described above, it is a deviation from the scope of the technical idea It will be understood by those skilled in the art that many modifications and variations can be made to the invention without departing from the scope of the invention. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Is a structure of a basic half-wavelength microstrip antenna.

1B is a structure of a quarter wave microstrip antenna.

Figure 1c is a structure of a quarter-wave microstrip antenna with the size of the ground plane reduced to the size of the radiating element.

FIG. 2A is a structure of a quarter-wave microstrip antenna with the antenna of FIG. 1C upright; FIG.

FIG. 2B illustrates a structure of the antenna in which the antenna of FIG. 2A is modified using a folded structure and a perturbation effect. FIG.

Figure 3 is a structure of a 40MHz band small microstrip antenna according to the present invention.

4A is a cross-sectional view of a 40 MHz band miniature microstrip antenna for illustrating a feeding position in accordance with the present invention.

Figure 4b is a graph showing the simulation results to look for impedance matching according to the separation distance (h) between the ground plane and the feed point in accordance with the present invention.

5A is a cross-sectional view of a 40 MHz band miniature microstrip antenna for showing the separation distance d between the first inner plate and the second inner plate according to the present invention.

Figure 5b is a graph showing a result of simulating the change in the resonance frequency according to the separation distance (d) between the first inner plate and the second inner plate according to the present invention.

Figure 6a is an exemplary view showing the size of the actual fabricated antenna of the 40MHz band small microstrip antenna according to the present invention.

6b is an actual photographic representation of a 40 MHz band miniature microstrip antenna in accordance with the present invention;

Figure 6c is a graph showing the measurement results and simulation results for the return loss of the 40MHz band small microstrip antenna according to the present invention.

7A and 7B are graphs showing simulation results and actual measurement results of a radiation pattern of a 40 MHz band small microstrip antenna according to the present invention.

8A and 8B are exemplary views showing a plurality of vertical plates attached to the first inner plate and the second inner plate according to the present invention.

Figure 8c is a graph showing the return loss of the 40MHz band small microstrip antenna with a plurality of vertical plate in accordance with the present invention.

** Description of symbols for the main parts of the drawing **

100: radiating element 111: first outer plate

112: second outer plate 121: first folding part

122: second folding part 131: first inner plate

132: second inner plate 141: first vertical plate

142: second vertical plate 143: third vertical plate

144: fourth vertical plate

Claims (5)

40MHz band small microstrip antenna, Air or a dielectric having a predetermined dielectric constant and formed between the ground plane and the radiating element; A ground plane (GND) that performs a grounding function; And A first outer plate 111 and a second outer plate 112 extending in predetermined lengths in a predetermined direction (z-axis) from both ends of the ground plane GND; At each end of the first outer plate 111 and the second outer plate 112, a first fold portion 121 and a second fold extending in a predetermined length in parallel to the ground plane GND in the antenna center direction, respectively. Section 122, Each predetermined length of each of the first and second folding portions 121 and 122 extends vertically in parallel to the first and second outer plates 111 and 112 in the outward direction of the antenna. A radiating element (100) consisting of a first inner plate (131) and a second inner plate (132); , ≪ / RTI & A feeding point (FP) is positioned at any one of the first outer plate 111 and the second outer plate 112, The radiating element 100 includes a plurality of vertical plates 141, 142, 143, and 144, which are alternately attached in a direction facing each other in the first inner plate 131 and the second inner plate 132, respectively. Miniature Microstrip Antenna. The method of claim 1, Among the plurality of vertical plates 141, 142, 143, and 144, the first vertical plate 141 and the third vertical plate 143 extend vertically by a predetermined length from the second inner plate 132 toward the first inner plate 131. It is Among the plurality of vertical plates 141, 142, 143, and 144, the second vertical plate 142 and the fourth vertical plate 144 extend vertically by a predetermined length from the first inner plate 131 toward the second inner plate 132. 40MHz band miniature microstrip antenna, characterized in that. The method of claim 1, 40MHz band small microstrip antenna, characterized in that impedance matching is performed by changing the separation distance h between the ground plane GND and the feed point FP. The method of claim 3, wherein The distance (h) between the ground plane (GND) and the feed point (FP) is, 40MHz band small microstrip antenna, characterized in that 20mm to 40mm. The method of claim 1, The distance d between the first inner plate 131 and the second inner plate 132 is 20 mm to 60 mm.

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