JPH0951223A - Broad band notch antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a broad frequency band for the VSWR characteristic toward lower frequencies without increasing the width of a metallic conductor SOLUTION: A slot line 5 and a taper slot line 4 connected to an element opening are provided to a base plate 2 to one side of the surface of which a metallic conductor section 3 is arranged. Then notches 6a, 6b having a loopback structure of the metallic conductor parts are provided near the element opening. Thus, the size of the conductor section 3 is equivalently increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband VSW.
The present invention relates to a wide band notch antenna having R characteristics and miniaturized by a vertical folding structure.

[0002]

2. Description of the Related Art FIG. J. Bahl, P .;
BARTIA "MICROSTORIP ANTE
NNAS ”Arttech House ISBN: 0
89006-098-3 is a perspective view showing a conventional notch antenna shown in Chapter 6, page 235. In the figure, a notch antenna 1 is provided on a dielectric substrate 2 and is composed of a metal conductor portion 3 integrally connected thereto. The notch antenna 1 has a tapered slot line 4 and a slot line 5 as shown in FIG.

Next, the operation will be described. The signal propagated by the slot line 5 is matched with the space and radiated by the tapered slot line 4. In this case, it is ideal that the slot line 5 and the tapered slot line 4 originally have an infinitely wide metal conductor portion 3, but the size is limited due to structural restrictions.

The applicant measured the return loss by changing the width W of the tapered notch antenna shown in FIG. The measurement result is shown in FIG. As described above, the width W changes little at around 18 GHz, but at 6 GHz, the return loss becomes worse as the width becomes narrower.

[0005]

Since the conventional notch antenna is configured as described above, it is necessary to increase the width W in FIG. 10 in order to widen the VSWR characteristic to the low frequency side. There is a problem that the vertical dimension of the antenna element 1 becomes large.

The present invention has been made to solve the above problems, and a wide band notch antenna in which the VSWR characteristic is widened to the lower frequency side without increasing the vertical width of the antenna element. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a wide band notch antenna comprising a slot line and a taper slot line connected to an element opening on a substrate having a metal conductor portion on one side of a surface thereof. A notch is provided near the element opening so that the metal conductor portion has a folded structure.

A wide band notch antenna according to a second aspect is the wide band notch antenna according to the first aspect, characterized in that a notch having a multiple-folded-back structure is provided.

According to a third aspect of the present invention, in a wide band notch antenna having a slot line and a taper slot line connected to an element opening on a substrate having a metal conductor portion disposed on one side of a surface, a metal is provided near the element opening. It is characterized in that a vertical metal plate is provided on the conductor portion.

A wide band notch antenna according to a fourth aspect is the one according to the first aspect, the second aspect, or the third aspect, wherein two element antennas intersect each other at a right angle.

A wide band notch antenna according to a fifth aspect is the antenna according to any one of the first to fourth aspects, characterized in that the element antenna has an array structure in which a metal conductor portion is shared.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1 to 5 are exactly the same as those of the conventional device, and the description thereof will be omitted. 6a,
6b is a notch for forming the metal conductor portion 3 into a folded structure.

Next, the operation will be described. This wide band notch antenna has a notch 6 provided in the metal conductor portion 3.
Due to a and 6b, the metal conductor portion 3 near the element opening is folded back to the rear of the element, and the metal conductor portion 3 near the element opening can be enlarged equivalently, and a wide band VS can be obtained.
The vertical dimension of the antenna can be reduced while maintaining the WR characteristic.

An experiment was conducted to confirm the effect of the notch shown in FIG. That is, in order to widen the band of the taper notch antenna to the low frequency side, it is necessary to make the width of the opening of the taper notch sufficiently large. However, as shown in FIG. An attempt was made to broaden the width of the opening equivalently by making it M-shaped.

As a result, as shown in FIG.
mm and a frequency of 6 to 18 GHz, VSWR of 2.8 or less was obtained.

According to this embodiment, the notch antenna can be miniaturized by folding back the metal conductor portion of a size that the notch antenna originally requires.

Embodiment 2. Further, in the above-described embodiment, the metal conductor portion 3 is folded back once, but FIG.
As shown in FIG. 6, the notches 6c and 6d may be added so that the folding may be performed a plurality of times, and the same effect as that of the above-described embodiment can be obtained.

Embodiment 3. In addition, the first embodiment
In Fig. 2, the size of the metal conductor portion 3 near the opening is equivalently increased by folding the metal conductor portion 3 backward, but as shown in FIG. ,
Even if the metal plates 7a and 7b are extended in the direction perpendicular to the surface, the same effect as in the above-described embodiment can be obtained.

Embodiment 4 Further, in the third embodiment, the metal plates 7a and 7b are extended to one side of the surface on which the metal conductor portion 3 is provided, but even if they are extended to both sides as shown in FIG.
The same effect as the third embodiment is obtained.

Embodiment 5. Further, in the first embodiment, the number of elements is only one, but even if a plurality of elements are crossed with each other as shown in FIG. 7, the same effect as in the above-described example can be obtained.

Embodiment 6 Further, in the above-described embodiment, although the element is a single element, the same effect can be obtained even if the element conductors are shared by the element conductors in an array structure as shown in FIG.

[0022]

According to the broadband notch antenna of the first aspect of the present invention, the substrate having the metal conductor portion disposed on one side of the surface has the slot line and the taper slot line connected to the element opening. Since the metal conductor is provided with the cutout having the folded structure, the VSWR can be widened to the low frequency range side without increasing the width of the metal conductor.

According to a second aspect of the present invention, in the wide band notch antenna according to the first aspect, since the notch having the multiple-folded-back structure is provided, the width V of the metal conductor is not increased.
The SWR can be broadened to the low frequency band side.

According to a third aspect of the present invention, in a wide band notch antenna having a slot line and a taper slot line connected to an element opening on a substrate on which a metal conductor is disposed on one side of a surface, a metal is provided near the element opening. Since the vertical metal plate is provided on the conductor, VSW can be used without increasing the width of the metal conductor.
R can be broadened to the low frequency band side.

A wide band notch antenna according to a fourth aspect of the present invention has a structure in which two element antennas capable of widening the VSWR band toward the low frequency band side are crossed at right angles to each other without increasing the width of the metal conductor portion. Is obtained.

A wide band notch antenna according to a fifth aspect of the present invention can be obtained with an array structure using an element antenna capable of widening the VSWR to the low frequency side without increasing the width of the metal conductor portion.

[Brief description of drawings]

FIG. 1 is a perspective view of a wide band notch antenna according to a first embodiment of the present invention.

FIG. 2 is an antenna configuration diagram used for measuring a VSWR characteristic of the wide band notch antenna according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a VSWR characteristic of the wide band notch antenna according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a wide band notch antenna according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a wide band notch antenna according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a wide band notch antenna according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a wide band notch antenna according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view of a wide band notch antenna according to a sixth embodiment of the present invention.

FIG. 9 is a perspective view of a conventional wide band notch antenna.

FIG. 10 is an antenna configuration diagram used for measuring return loss of a conventional wide band notch antenna.

FIG. 11 is a diagram showing a return loss measurement result of a conventional wide band notch antenna.

[Explanation of symbols]

1 notch antenna, 2 substrate, 3 metal conductor part, 4
Tapered slot line, 5 slot line, 6a, 6b
Cutout.

Claims (5)

[Claims] 1. A wide band notch antenna having a slot line and a taper slot line connected to an element opening on a substrate having a metal conductor section disposed on one side of a surface thereof, wherein the metal conductor section is provided near the element opening. A wide-band notch antenna characterized in that a notch with a folded structure is provided. 2. The wide-band notch antenna according to claim 1, further comprising a notch having a multiple-folded-back structure. 3. A wide band notch antenna having a slot line and a taper slot line connected to an element opening on a substrate having a metal conductor section arranged on one side of a surface, wherein the metal conductor section is provided near the element opening. A wide band notch antenna characterized by having a vertical metal plate. 4. The wide band notch antenna according to claim 1, wherein the two element antennas intersect each other at a right angle. 5. The wide band notch antenna according to claim 1, wherein the element antenna has an array structure sharing a metal conductor portion.