JPS6248102A - Microstrip line antenna - Google Patents

Abstract

PURPOSE:To eliminate the impedance mismatching by providing a fixed member comprising a cylindrical grounding conductor and a metallic member penetrated from a side opposite to the dielectric fixed to one surface of the grounding conductor so as to conduct electrically the grounding conductor and the fixed member even if a gap is produced. CONSTITUTION:A microstrip line antenna 21 is equipped with a plate dielectric 22 made of a synthetic resin material such as 'Teflon(R)', a microstrip line 23 is formed on one surface of the dielectric 22 and a protection film 24 is formed to the remaining region. A grounding conductor 25 made of a material such as aluminum is fixed to the other surface of the dielectric 22 and a through hole 26 of an inner diameter D1 is formed and a through hole 27 having an inner diameter D2 larger than the inner diameter D1 coaxial to the through hole 26 is formed to the grounding conductor 25. A fixed member 28 having an inner diameter D3 being an intermediate value between the diameters D1 and D2 and made of a metallic material such as stainless steel is fitted to the through hole 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a microstrip line antenna used, for example, as a receiving antenna in satellite communications.

BACKGROUND ART FIG. 3 is a WI side view of a microstrip line antenna 1 of the prior art. The configuration of a prior art microstrip line antenna 1 will be described with reference to FIG.

A microstrip line 3 made of a metal material is formed on one surface of a transparent body 2 made of a synthetic resin material of the microstrip line antenna 1, and a ground conductor 4 made of a metal material is fixed to the other surface. A protective film 5 made of a synthetic resin material is formed on the remaining area of the blade surface of the dielectric 2 other than the area where the microstrip line 3 is formed. Further, through holes 6 and 7 are formed in the dielectric 2 and the ground conductor 4, respectively.

The grounding conductor 4 has a right cylindrical dielectric body 8 which is fitted into the insertion hole 7 and is made of a synthetic resin material.
It is installed coaxially with the insertion hole 6. A center bin 11 is mounted within the cylindrical dielectric body 8, which is formed by integrally coaxially forming a small diameter part 9 and a large diameter part 10, each of which has a cylindrical shape. The end portion of the small diameter portion 9 of the center bin 11 passes through the insertion hole 6 of the dielectric 2 and the microstrip line 3 and projects outward. i! of this protruding small diameter portion 9! The @ part and the microstrip line 3 are fixed with solder 12, for example.

Further, the cylindrical dielectric body 8 is fitted almost perfectly into the screw hole 13.
．． A fixing member 17 having seven runs 15, 16 formed with 34 is mounted. Further, screw holes 4 a are provided at positions corresponding to the screw holes 13 and 14 of the dielectric 2 and the ground conductor 4.
, 2 a:4 b, and 2 b are formed, respectively. Screw 1 into these screw holes 13, 4a, 2a; 14° 4b, 21+
8 and 19 are screwed together, and the fixing member 17 is fixed to the ground conductor 14. In this way, the microstrip line antenna 1 was constructed.

The microstrip line antenna 1 having such a configuration first includes a protective film 5 and a microstrip line 3.
, the dielectric 2 and the ground conductor 4 are adhered to each other in this order, and then the through holes 7, 6 are formed and the screw holes 4a, 4 are formed.
b; Carve internal threads in 2 a and 2 b. next,
The center bin 11, the cylindrical dielectric 8, and the fixing member 17 are fixed to the ground conductor 4 and the dielectric 2 via screws 18, 19, and the small diameter portion 9 of the center bin 7 and the microstrip line 3 are connected with the solder 12. It was fixed in place.

In the microstrip line antenna 1 having such a configuration and manufacturing process, the ground conductor 4 and the cage-shaped electric current body 8 are fixed by so-called fitting, and a nt+ gap is created between them. As a result, an impedance mismatch of the microstrip line antenna 1 occurs,
There was a problem that reflection loss and radiation loss increased.

Purpose An object of the present invention is to provide a microstrip line antenna that can solve the above-mentioned problems, eliminate impedance mismatch, and significantly improve characteristics.

Embodiment MS FIG. 1 is a sectional view of a microstrip line antenna 21 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the microstrip line antenna 21. The seven components of the microstrip fin antenna 21 of this embodiment will be explained with reference to FIGS. 1 and 2. The microstrip fin antenna 21 of this embodiment includes a flat dielectric body 22 made of a synthetic resin material such as Teflon (1 mml'iE). On one surface of the dielectric 22, a microstrip line 23 made of, for example, copper foil (35 μl thick) is formed. On the one surface of the dielectric body 22, a protective film 24 made of a synthetic resin material such as polyethylene Tele 7 (100 μm thick) is formed on the remaining area other than the area where the microstrip line 23 is formed. Ru.

A ground conductor 25 made of, for example, aluminum is placed on the other surface of the dielectric 22. An insertion hole 26 with an inner diameter D1 is formed at the same position of the dielectric 22 and the microstrip line 23, and the ground conductor 25
An insertion hole 27 is formed coaxially with the insertion hole 26 and having an inner diameter D2 larger than the inner diameter D1. This insertion hole 27
A fixing member 28 made of a metal material such as stainless steel is fitted into the fixing member 28, which is basically a right cylinder, has an outer diameter substantially equal to the outer diameter D2, and has an inner diameter D3 that satisfies the indicated r relationship in the F formula. be done.

D2>D3>DI... (1) This fixing member 8 has a 7-run no. 31 in which a screw hole 29.30 is formed.
．． It has 32. In the ground conductor 25 and the dielectric 22, screw holes 25a are provided at positions corresponding to the screw holes 29 and 30, respectively.

22a; 25b, 22b are formed. This screw hole 29
．． 25a, 22a: Screws 33, 34 are screwed into 30, 25b, respectively, and the fixing member 28 is fixed to the ground conductor 25 and the dielectric 22.

The fixing member 28 has a right cylindrical shape and is made of a synthetic resin material such as Teflon, and has an outer diameter equal to the inner diameter D.
A cylindrical dielectric body 35 having an inner diameter D4 approximately equal to 3 and larger than the inner diameter D1 is disposed. Inside the cylindrical dielectric body 35, a large diameter portion 36 and a small diameter portion 37, each having a right circular column shape and having an outer diameter approximately equal to the inner diameter D4, and a small diameter portion 37 having an outer diameter approximately equal to the inner diameter D1 are integrally formed coaxially. A center bin 38, which is a connecting bin made of a metal material such as beryllium copper, is attached. The free end of the small diameter portion 37 of the center bin 38 is inserted through the dielectric 22 (and through the insertion hole 26 of the microstrip line 23 and protrudes outward).
are fixed by, for example, solder 39.

The length Hl of the fixing member 28 on the side of the dielectric 22 from the 7-run no. 31.32 is formed approximately equal to the thickness H2 of the ground conductor 25, so when the fixing member 28 is fitted into the insertion hole 27 of the ground conductor 25, The end of the fixing member 28 on the side of the dielectric 22 contacts the other surface of the dielectric 22 without creating a gap, thereby forming an island. Further, the shapes of the fixing member 28, dielectric 22, center bin 38, etc. are determined in advance so that impedance matching of the entire microstrip line antenna 21 is performed.

The microstrip line antenna 21 was configured as described above, and the cylindrical dielectric body 35 was attached almost tightly to the fixing member 28 without creating a gap. Therefore, even if some gap occurs between the fixing member 28 and the ground conductor 25, the fixing member 28 and the ground conductor 25
If the ground conductor 25 and the fixing member 28 are in partial contact with each other, the ground conductor 25 and the fixing member 28 are electrically connected to each other, and this gap becomes irrelevant with respect to impedance matching of the microstrip line antenna 21. Therefore, the radiation loss and transmission loss of the microstrip fin antenna 21 could be significantly reduced, and the characteristics of the microstrip line antenna 21 could be significantly improved.

Effects As described above, according to the present invention, there is provided a fixing member made of a metal material that has a right cylindrical shape and penetrates the ground conductor from the side opposite to the dielectric fixed to one surface of the ground conductor. Therefore, even if there is a gap between the ground conductor and the fixed member, if they are in partial contact with each other, the ground conductor and the fixed member are electrically connected, and the impedance of the microstrip line 7 antenna With respect to the matching l2, the gap becomes irrelevant. Therefore, such a gap does not cause impedance mismatch in the microstrip line antenna, and radiation loss and transmission loss can be significantly reduced, thereby significantly improving the characteristics of the manufactured microstrip line antenna. I was able to do that.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view of a microstrip line antenna 21 according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the microstrip line antenna 21, and FIG. 3 is a microstrip line antenna of the prior art. 1 is a cross-sectional view of a line antenna 1. FIG. 21... Microstrip line antenna, 22...
...Dielectric, 23...Microstrip line, 2
5...Grounding conductor, 28...Fixing member, 35...Screen-shaped dielectric agent Patent attorney Mohammed Kei Partial Procedural Amendment October 24, 1985

Claims (1)

[Scope of Claims] A flat grounding conductor made of a metal material, a dielectric made of a synthetic resin material fixed to one surface of the grounding conductor, and a microstrip formed on the surface of the dielectric opposite to the grounding conductor. A microstrip line antenna comprising: a line; and a fixing member made of a metal material and having a right cylindrical shape and penetrating the ground conductor from the side opposite to the dielectric.