JP3918321B2 - Feedphone for linear polarization - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linearly polarized feedphone, and more particularly, to a device capable of stably obtaining good cross polarization characteristics while shortening the axial dimension.
[0002]
[Prior art]
Conventionally, as shown in FIG. 3, for example, a linearly polarized feedphone has two orthogonal probes 31 and 32 arranged at a distance of λ / 2 in a circular waveguide having a horn-shaped opening, and a short circuit therebetween. A plate that is provided with a plate 40 and a reflective surface 41 behind λ / 4 so as to receive vertical polarization and horizontal polarization has been put into practical use. However, this configuration has good cross-polarization characteristics, but has a problem that the axial dimension becomes long. Therefore, in recent years, as shown in FIG. 4, probes 3a and 3b perpendicular to the axis of the circular waveguides 1b and 2a are formed in a pattern in circular waveguides 1b and 2a having a horn-shaped opening 1a. At the same time, the substrate 3 having the hole 3c provided in the coaxial core is disposed, and the reflecting surface 2b disposed substantially λ / 4 rearward of the substrate 3 is erected in the axial direction of the circular waveguides 1b and 2a. A linearly polarized feedphone in which the conductor post 4 is provided and the conductor post 4 is inserted into the hole 3c of the substrate 3 has been put into practical use. When the conductor post 4 is not provided, the electric field input into the circular waveguide has a cross polarization characteristic because the electric field of the polarization received by the probe 3a largely intersects the probe 3b as shown in FIG. However, the provision of the conductor post 4 reduces the electric field that is bent to the conductor post and intersects the probe 3b as shown in FIG. In addition, there is an advantage that the axial dimension can be shortened. However, in this configuration, the substrate and the position of the conductor post is not regulated, the positional relationship between the conductor post-and each probe is not stable, therefore, the problem that the cross polarization characteristic also changes there were.
[0003]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems and stabilizes the positional relationship between the probe and the conductor post, so that the axial dimension is short, and a linear polarization that can stably obtain good cross polarization characteristics. The purpose is to provide a wave feed phone.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms a probe orthogonal to the axial core of the circular waveguide in a circular waveguide having a horn-shaped opening, and provides a hole in the coaxial core. On the other hand, a conductive post is provided on the reflective surface arranged approximately λ / 4 behind the substrate, and is placed in the axial direction of the circular waveguide, and the conductive post is inserted into the hole of the substrate. In the linearly polarized wave feedphone, the hole of the substrate is formed smaller than the conductor post, while the conductor post is in contact with the back surface of the substrate, and a screw hole is provided at the tip thereof. As a linearly polarized feedphone, the inserted screw is screwed into the screw hole and the substrate is fixed to the conductor post to stabilize the positional relationship between the probe and the conductor post. Yes.
[0005]
Lands having the same diameter as the conductor posts are provided at the peripheral portions of both sides of the substrate hole in the substrate hole, and a linearly polarized feedphone is formed by through-hole plating connecting the lands.
[0006]
A linearly polarized feedphone having a boss inserted through the hole of the substrate at the tip of the conductor post and a screw hole formed in the boss is provided.
[0007]
The boss is a linearly polarized feedphone in which the boss is formed slightly shorter than the thickness of the substrate.
[0008]
[0009]
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As described above, in the linearly polarized feedphone according to the present invention, the hole of the board is formed smaller than the conductor post, while the conductor post is in contact with the back surface of the board and the screw hole is provided at the tip thereof. Since the screw inserted through the hole in the board is screwed into the screw hole and the board is fixed to the conductor post, the positional relationship between the probe and the conductor post is stabilized, and the cross polarization is stable and good. characteristics can be obtained. Further, since the conductor post and the screw can be reliably connected through the through hole, stable cross polarization characteristics can be obtained.
[0011]
【Example】
Hereinafter, a linearly polarized feedphone according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view of an essential part showing an embodiment of a linearly polarized feedphone according to the present invention. In the figure, reference numeral 1 denotes a chassis formed of a conductive material such as a metal, a first circular waveguide portion 1b having a horn-shaped opening 1a is formed on one side, a substrate housing portion 1c is provided on the back surface, and a lower portion Is provided with a connector mounting portion 1d. Reference numeral 2 denotes a shield cover made of a conductive material such as a metal, which communicates with the first circular waveguide portion 1b on one side and forms a second circular waveguide portion 2a having a reflective surface 2b. Has been. A conductor post 4 formed integrally with the reflecting surface 2b is erected on the axis of the second circular waveguide portion 2a. Reference numeral 3 denotes a substrate fixed to the substrate housing portion 1c, and a first circular waveguide that receives linearly polarized waves (horizontal polarized waves or vertical polarized waves) input to the first circular waveguide portion 1b. Two probes 3a and 3b whose extension lines are orthogonal to each other on the axis of the tube portion 1b are formed by a pattern. Further, a hole 3c smaller than the diameter of the conductor post 2b is formed in the shaft core portion of the substrate. Reference numeral 4 denotes the conductor post, which has a length that comes into contact with the back surface of the substrate 3, and is provided with a screw hole 4a at the tip thereof. Reference numeral 5 denotes a screw that is inserted into the hole 3c of the substrate and screwed into the screw hole 4a. Reference numeral 6 denotes an output connector that is attached to the connector attaching portion and connected to the substrate.
[0012]
FIG. 2 is a cross-sectional side view of an essential part showing another embodiment of a linearly polarized feedphone according to the present invention. As shown in FIG. 2A, lands 3d and 3e corresponding to the holes 3c and having the same size as the diameter of the conductor post 2b are formed on both surfaces of the substrate 3, and both the lands 3d and 3e are formed. They are connected by through-hole plating 3f. Further, as shown in FIG. 2- (B), a boss 4b slightly shorter than the thickness of the board inserted through the hole 3c is provided at the tip of the conductor post 2b so that the board can be positioned. The screw hole 4a is formed in the upper part. Further, as shown in the figure, if the head 5a of the screw 5 is formed in a spherical shape so that the concentration of the electric field is increased, the electric field can be more strongly attracted to the conductor post, and a better cross polarization characteristic can be obtained. Sex can be obtained.
[0013]
【The invention's effect】
As described above, according to the linearly polarized feedphone according to the present invention, the hole of the substrate is formed smaller than the conductor post, while the conductor post is in contact with the back surface of the substrate and the screw hole is formed at the tip thereof. Since the screw inserted through the hole of the board is screwed into the screw hole and the board is fixed to the conductor post, the positional relationship between the probe and the conductor post is stabilized, and a stable and satisfactory crossing is achieved. it is possible to obtain the polarization characteristics. Further, it is possible to securely connect the conductor post and screw the through hole, it is possible to obtain a more stable cross-polarization characteristics. Further, since there is provided a boss to be inserted into holes of the substrate to the tip of the conductor posts, are positioned against the conductor posts of the substrate, more stable positional relationship can be obtained, more stable good cross-polarization characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an essential part showing an embodiment of a linearly polarized feedphone according to the present invention.
FIG. 2 is a cross-sectional side view of an essential part showing another embodiment of a linearly polarized feedphone according to the present invention.
FIG. 3 is a cross-sectional view of a main part showing a conventional linearly polarized feedphone.
FIG. 4 is a cross-sectional view of a main part showing a conventional linearly polarized feedphone.
FIG. 5 is an explanatory diagram for explaining the operation of a linearly polarized feedphone according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chassis 1a Horn-shaped opening 1b Circular waveguide 1c Board | substrate accommodating part 1d Connector attachment part 2 Shield cover 2a Second circular waveguide part 2b Reflecting surface 3 Board | substrate 3a, 3b Probe 3c hole 3d, 3e Land 3f Through hole Plated 4 Conductor post 4a Screw hole 4b Boss 5 Screw 5a Screw head

Claims (4)

In the circular waveguide having a horn-shaped opening, a probe orthogonal to the axial core of the circular waveguide is formed by a pattern, and a substrate having a hole in the coaxial core is disposed. / 4 In the linearly polarized wave feed phone provided with a conductor post erected in the axial direction of the circular waveguide on the reflection surface arranged at the rear, and passing the conductor post through the hole of the substrate, While forming a hole in the board smaller than the conductor post, the conductor post abuts on the back surface of the board, and a screw hole is provided at the tip thereof, and a screw inserted through the hole in the board is screwed into the screw hole. The substrate is fixed to a conductor post and the positional relationship between the probe and the conductor post is stabilized . 2. The linearly polarized wave according to claim 1, wherein lands having the same diameter as the conductor posts are provided at peripheral edges of both sides of the substrate hole and through-hole plating for connecting the lands is performed. Feedphone. The linearly polarized wave feed phone according to claim 1 or 2 , wherein a boss inserted through the hole of the substrate is provided at a tip of the conductor post, and a screw hole is formed in the boss. 4. The linearly polarized feedphone according to claim 3, wherein the boss is formed slightly shorter than the thickness of the substrate.

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