JPS63184407A - Conical beam antenna - Google Patents

Abstract

PURPOSE:To obtain the titled antenna with a large gain at a designated elevating angle suitable for mounting onto a mobile body by arranging radially plural element antennas of a planer structure constituting a microstrip antenna so as to obtain a conical beam. CONSTITUTION:As the element antenna, a travelling wave type circular polarized wave microstrip line antenna element 3 is used. In selecting the repetitive period length of a bent part of the element 3, the repetitive number of frequencies and the bent shape properly, then the elevating angle theta of the beam 8, peak gain and the frequency band are set freely. In arranging the elements 3 radially, the conical beam 7 of the circularly polarized wave is obtained. The elevating angle theta and the peak gain of the beam 7 are nearly equal to the elevating angle theta and the peak gain of the beam 8 of the element 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conical beam antenna, and particularly to a conical beam antenna suitable for being mounted on a moving body such as an automobile.

[Conventional technology]

The mobile station antenna used for communication between a mobile body and a communication satellite is preferably a conical beam antenna that does not require satellite tracking when the mobile body moves.

Furthermore, in a case where the movement range is relatively narrow, such as in a car, the elevation angle θ of the satellite can be considered to be approximately constant, so a conical beam antenna with a large peak gain at a specified elevation angle θ is desirable.

FIGS. 4 to 6 are perspective views of three examples of conventional conical beam antennas.

The conventional example shown in Fig. 4 is an orthogonal hanging dipole antenna (c
rossed drooping antenna)
, the conventional example shown in Fig. 5 is a quadruple helix antenna (qu
ad-refiler helix antenna
), and the conventional example shown in FIG. 6 is an antenna in which a parasitic element 14 is added to a circularly polarized microstrip antenna 13 by high-order mode excitation, and both can obtain a circularly polarized conical beam.

[Problem that the invention seeks to solve]

However, the conventional cone beam antenna described above,
In either case, the degree of freedom in design is small, making it difficult to obtain a large gain at a specified elevation angle θ, and the structure is three-dimensional, making it unsuitable for mounting on a moving object.

An object of the present invention is to provide a conical beam antenna that has a large degree of freedom in design, can obtain a large gain at a specified elevation angle θ, has a planar structure, and is suitable for being mounted on a moving object.

[Failure to solve the problem]

The conical beam antenna of the present invention includes a plurality of micro-IJ tube line antennas arranged radially with a common feeding point.

〔Example〕

The present invention will be described in detail below with reference to drawings showing embodiments.

FIG. 1(a) is a plan view of the first embodiment of the conical beam antenna of the present invention, and FIG. 1(b) is A-A in FIG. 1(a).
It is a longitudinal cross-sectional view along the line.

In the embodiment shown in FIGS. 1(a) and 1(b), the dielectric plate 1
, a ground conductor 2 disposed on one surface, six strip conductors 3 disposed radially with one end in common on the other surface, and a respective one on the other end of each strip conductor 3. It is comprised of a terminating resistor 4 connected to one end, a conductor bar 5 that short-circuits the other end of each terminating resistor 4 and the ground conductor 2, and a coaxial line 6 that supplies power to a common connection point of the strip conductor 3. ing.

The embodiment shown in FIGS. 1(a) and 1(b) has a configuration in which six element antennas shown in FIG. 2 are arranged radially.

The element antenna shown in FIG. 2 is a well-known progressive circularly polarized microstrip line antenna. The number and shape of the bent portions can be selected and set freely.

By radially arranging the element antennas shown in FIG. 2, a circularly polarized conical beam 7 can be obtained as shown in FIG. 1(b). The elevation angle θ and peak gain of the conical beam 7 are approximately equal to the elevation angle θ and peak gain of the beam 8 of the element antenna.

FIG. 3 is a perspective view of an element antenna constituting a second embodiment of the conical beam antenna of the present invention.

The element antenna shown in FIG. 3 includes a dielectric plate 1, a linear strip conductor 9 and a terminating resistor 4 disposed on one surface of the dielectric plate 1, and a ground conductor 10 disposed on the other surface. has been done. One end of the strip conductor 9 is a feeding point,
The other end is terminated with a terminating resistor 4 (a mechanism for short-circuiting one end of the terminating resistor 4 to the ground conductor 10 is not shown). Earth conductor 10
, the slit 1 is perpendicular to the strip conductor 9.
1 is provided periodically.

The element antenna shown in Fig. 3 is a well-known traveling wave type linearly polarized microstrip line antenna, and its beam 1
The elevation angle θ, peak gain, and frequency band of 2 can be freely set by appropriately selecting the repetition period length, number of repetitions, and slit shape of the slit 11.

Figure 1 (a) and (b) from the element antenna shown in Figure 2.
Similarly to the embodiment shown in FIG. 1, the conical beam 7 shown in FIG. 1(b) and the conical beam 7 shown in FIG. A second embodiment of a linearly polarized beam of the same shape is obtained.

The first and second embodiments-5 of the present invention described above both use a traveling wave type microstrip line antenna with a wide band as an element antenna, and therefore have the advantage of having a wide band.

However, it is not necessarily necessary that the element antennas constituting the conical beam antenna of the present invention be of the traveling wave type.
Therefore, it is not necessarily necessary for the element antenna to be terminated with a terminating resistor.

〔Effect of the invention〕

As explained in detail above, the conical beam antenna of the present invention obtains a conical beam by radially arranging a plurality of element antennas, which are microstrip line antennas with a large degree of freedom in design. It has the effect that a large gain can be obtained at a specified elevation angle θ, and also has the advantage that the structure is planar and suitable for being mounted on a moving body.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view of a first embodiment of the conical beam antenna of the present invention, FIG. 1(b) is a longitudinal sectional view taken along line A-A in FIG. 1(a), and FIG. 2 is a perspective view of an element antenna constituting the embodiment shown in FIGS. 1(a) and (b), and FIG. 3 is a perspective view of an element antenna constituting the second embodiment of the conical beam antenna of the present invention. The perspective views of Figures 4 to 6 are
1 is a perspective view of three examples of conventional cone beam antennas; FIG. 1...Dielectric plate, 2...Ground conductor, 3.
... Strip conductor, 4 ... Termination resistor,
5... Conductor rod, 6... Coaxial line, 9...
...Strip conductor, 1o...Ground conductor,
11...Slit. Figure 2 Figure 3 Figure 4 Figure 5 ■ ■ Figure 6

Claims (1)

[Claims] A conical beam antenna characterized by having a plurality of microstrip line antennas arranged radially with a common feeding point.