JP2713179B2 - Duplexer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer, and more particularly to an orthogonal splitter having a short-circuiting plate for splitting electromagnetic waves having mutually orthogonal polarization planes for each polarization.

[0002]

2. Description of the Related Art Conventionally, horizontal communication and orthogonal polarization of mutually orthogonal polarization planes are assigned to adjacent channels for radio communication, or satellite communication for radio communication using right-handed or left-handed circularly-polarized light, and so on. In the wireless communication field, the receiving side selectively removes the interference wave of the electromagnetic wave of the desired channel by removing the interference wave, and receives and transmits the desired polarization by one device. A duplexer that splits electromagnetic waves having orthogonal polarization planes for each polarization is used. Conventionally, such a duplexer is provided with a short-circuiting plate in the waveguide section to prevent the propagation of electromagnetic waves to the rectangular branch waveguide as shown in Japanese Patent Application No. 63-102968. Wave filters are known.

FIG. 8 shows an example of the above-described conventional duplexer. FIG. 8A is an exploded perspective view, and FIG. 8B is a sectional view taken along the line DD in FIG. . As shown in FIGS. 1A and 1B, in the conventional duplexer, the rectangular main waveguide 1 formed in the waveguide section 6 is moved in the axial direction (X direction) via the step conversion section 4. In addition, a rectangular branch waveguide 3 having an axial direction in the Y direction orthogonal to the X direction is communicated with the sub-waveguide 2 in the vicinity of the joint with the step converter 4.

The electromagnetic wave input / output opening 3a of the rectangular branch waveguide 3 is provided with an XPD (Cross Polarizati).
X that passes through the center of the rectangular main waveguide 1 to improve on discrimination (or orthogonal polarization separation).
Notched accurately so as to be symmetrical with respect to the -Y plane. The electromagnetic wave input / output opening 3a is connected to the X-ray waveguide so that the opposing side walls of the rectangular branch waveguide 3 are short-circuited.
The short-circuit plate 5 having a plane parallel to the Y plane (for example, the H plane) is formed. A lid 7 is provided above the waveguide section 6.
Are fixed by screws 8, thereby forming a duplexer.

In the duplexer having such a configuration, the electromagnetic wave input to the rectangular main waveguide 1 is polarized with the plane parallel to the XZ plane as the polarization plane, and the subwaveguide 2 is cut. When the frequency is lower than the off-frequency band, they are matched by the step converter 4 and introduced into the rectangular branch waveguide 3, and are extracted from the rectangular branch waveguide 3 through the short-circuit plate 5.

On the other hand, when an electromagnetic wave having a frequency band higher than the cutoff frequency of the sub-waveguide 2 is input to the sub-waveguide 2, the electromagnetic wave is matched to the rectangular main waveguide 1 by the step converter 4. And guided to the rectangular main waveguide 1 and taken out of the rectangular main waveguide 1. Further, at this time, when the electromagnetic wave input to the sub-waveguide 2 is a polarized wave whose polarization plane is a plane parallel to the XY plane, the electromagnetic wave is reflected by the short-circuit plate 5,
The introduction into the rectangular branch waveguide 3 is prevented.

[0007]

However, in the conventional duplexer having the above-described structure, the short-circuit plate 5 is formed integrally with the waveguide 6, so that the manufacturing of the waveguide 6 is difficult. However, there is a problem that it is difficult to form the short-circuit plate 5.

In the conventional duplexer having the above-described configuration, the short-circuiting plate 5 has a configuration in which all the polarized waves whose planes of polarization are parallel to the XZ plane are propagated to the rectangular branch waveguide 3. Also, in order to improve XPD, the aperture of the electromagnetic wave input / output opening 3a is cut out with high precision so as to be symmetric with respect to the XY plane passing through the center of the rectangular main waveguide 1. However, in order to accurately and symmetrically cut out the aperture of the electromagnetic wave input / output opening 3a, advanced technology is required.
There is a problem that it is difficult to improve the quality.

To solve such a problem, the inventors of the present invention have conducted intensive studies and as a result, the short-circuit plate 5 has been
It has been found that the short-circuit plate 5 can be easily manufactured by separately and independently forming the short-circuit plate 5. The short-circuit plate 5 is configured to reflect all polarized waves whose planes of polarization parallel to the XY plane are polarized and some polarized waves whose planes of polarization are parallel to the XZ plane. The short-circuiting plate 5 having such a configuration is connected to the rectangular branch waveguide 3 at the same distance from the XY plane of the electromagnetic wave input / output opening 3a passing through the center of the rectangular main waveguide 1 to the bottom surface of the rectangular branch waveguide 3. It has been found that by mounting the electromagnetic wave input / output opening 3a at a position opposite to the bottom surface of the wave tube 3, the aperture of the electromagnetic wave input / output opening 3a can be made substantially symmetrical with respect to the XY plane.

The present invention has been made in view of the above circumstances, and a short-circuit plate can be easily formed in a waveguide portion, and the diameter of a signal input / output opening can be precisely symmetrical by the short-circuit plate. It is an object of the present invention to provide a duplexer that can easily improve XPD.

[0011]

According to a first aspect of the present invention, there is provided a duplexer having a U-shaped longitudinal section and a T-shaped groove formed on a flat surface thereof. By having a flat lid, one end has an opening of a rectangular main waveguide, and the other end is connected in series to the rectangular main waveguide, and cuts off electromagnetic waves in a low frequency band equal to or less than a predetermined value. The rectangular main waveguide and the sub-waveguide have one end connected near the connecting portion of the rectangular main waveguide, and are orthogonal to each other introduced through the opening of the rectangular main waveguide. In a duplexer in which a rectangular branch waveguide that guides a polarized wave having a polarization plane orthogonal to the plane of the lid among the polarized electromagnetic waves to the other end is formed, the rectangular main waveguide of the rectangular branch waveguide is formed. The lid, which is inserted and fixed independently of the waveguide portion in an electromagnetic wave input / output opening near a connection portion between the tube and the sub-waveguide. As well as comprising a conductive shorting plate having a plane parallel to the plane, the short plate, the electromagnetic wave
XY of the input / output opening passing through the center of the rectangular main waveguide
Distance from the surface to the bottom of the rectangular branch waveguide
At the position opposite to the bottom surface of the rectangular branch waveguide.
And projecting toward the lid on the plane of the short-circuit plate.
One or more protrusions are formed .

In the duplexer according to the present invention, the short-circuit plate is preferably made of gold.
Metal plate member and the metal plate member
Both ends are bent toward the lid side, and the short-circuit plate is
Claims 1. A U-shaped longitudinal section.
3. The duplexer according to claim 3, wherein the short-circuit plate is made of a metal plate member.
And approximately the center of the metal plate member on the lid side.
Bent to protrude toward
In which the protrusions are formed.

According to a fourth aspect of the present invention, in the duplexer, the short-circuit plate is provided.
Before the step of attaching the lid to the waveguide portion, an elastic member is press-fitted into a groove formed in the tube wall of the electromagnetic wave input / output opening of the rectangular branch waveguide and fixed by elastic force. There is a configuration.

According to a fifth aspect of the present invention, in the duplexer, the short-circuit plate is provided.
Before the step of attaching the lid to the waveguide portion, the rectangular branch waveguide is fixed to the groove formed in the tube wall of the electromagnetic wave input / output opening by bonding with a conductive adhesive. The configuration is a conductive member made of the same conductive material as the waveguide portion.

[0015]

According to the duplexer of the present invention, a short circuit is formed at the electromagnetic wave input / output opening near the connection between the rectangular main waveguide and the sub-waveguide of the rectangular branch waveguide. The plate is made of a conductive member independent of the waveguide section, and the plane thereof is inserted and fixed in the electromagnetic wave input / output opening parallel to the plane of the lid, so that the short-circuit plate can be easily attached to the waveguide section. Can be formed.

Since one or a plurality of projections projecting toward the lid are formed on the plane of the short-circuiting plate, the short-circuiting plate defines a plane parallel to the XY plane as a plane of polarization. And some of the polarized waves whose planes are parallel to the XZ plane are reflected. Therefore, the short-circuiting plate is connected to the electromagnetic wave input / output opening through the center of the rectangular main waveguide.
-At the same distance from the Y plane to the bottom surface of the rectangular branch waveguide, if it is mounted at a position opposite to the bottom surface of the rectangular branch waveguide, the aperture of the electromagnetic wave input / output opening is substantially equal to the X- The shape can be symmetrical with respect to the Y plane, and XPD can be improved.

According to the duplexer according to the second and third aspects of the present invention, the short-circuiting plate can be easily manufactured, and according to the duplexer according to the fourth or fifth aspect, The short-circuit plate can be easily attached to the electromagnetic wave input / output opening, and the efficiency of the assembling work can be improved.

[0018]

Next, an embodiment of the duplexer according to the present invention will be described with reference to the drawings. First, a duplexer according to a first embodiment will be described with reference to FIGS. FIG.
1 is an exploded perspective view showing a duplexer according to a first embodiment of the present invention. 2 (a) and 2 (b) are explanatory views for assembling the main parts of the duplexer, and FIG. 2 (c) is a sectional view taken along the line AA in FIG. In both figures, the same components as those in FIG. 8 are denoted by the same reference numerals.

The waveguide section 10 has a U-shaped vertical section, a T-shaped groove formed in a plane, and is made of a conductive material such as aluminum or brass. Are fixed with screws 8. Thus, one end has an opening (port) of the rectangular main waveguide 1, and the other end is connected in series to the rectangular main waveguide 1 via the step converter 4, and the electromagnetic wave of a low frequency band equal to or less than a predetermined value An opening (port) of the sub-waveguide 2 which is cut off with respect to
Further, one end is connected to the vicinity of the connection between the rectangular main waveguide 1 and the step converting section 4, and the lid 7 is formed of electromagnetic waves of mutually orthogonal polarizations introduced through the opening of the rectangular main waveguide 1.
A rectangular branch waveguide 3 is formed to guide a polarized wave having a polarization plane (for example, E-plane) orthogonal to the plane (a) to an opening (port) at the other end.

The electromagnetic wave input / output near the connecting portion between the rectangular main waveguide 1 of the rectangular branch waveguide 3 and the step converter 4, which corresponds to the conventional short-circuit plate forming position of the rectangular branch waveguide 3, is described. Grooves 12a and 12b are formed in the tube wall of the opening 3a, and the short-circuit plate 11 is provided here.

The short-circuiting plate 11 is a flat U-shaped conductive member having conductivity and elasticity.
And the bent portions 11b and 11c on both sides are connected. Real truth
In the embodiment, as shown in FIG. 1 and FIG.
Both ends of the plate portion 11a are bent upward (lid 7)
As a result, the bent portions 11b and 11c are formed, and the short-circuit plate 1 is formed.
1 is formed in a U-shaped vertical section. Also, the bent part 11
As shown in FIG. 2 (a), b and 11c are formed so as to be slightly spread outward, and the height thereof is
The height is approximately the same as the height of 2a and 12b.

The material of the short-circuit plate 11 may be copper, brass, aluminum, beryllium copper, or the like.
Beryllium copper, which has excellent elasticity even in the form of a thin plate and has conductivity, is desirable.

Next, the assembling work of this embodiment will be described. The short-circuiting plate 11 is the groove 1 of the waveguide section 10 shown in FIG.
2a and 12b, and are press-fitted and fixed in the grooves 12a and 12b against the elastic force of the bent portions 11b and 11c. As a result, as shown in FIG. 2B, the short-circuit plate 11 has the bent portions 11b and 11c in close contact with the grooves 12a and 12b, respectively, and the flat plate portion 11a has the XY plane of the rectangular branch waveguide 3. (For example, the H plane), and is fixed by its elastic force.

The waveguide section 10 of the short-circuit plate 11
After assembling to the waveguide section 1 as shown in FIG.
0 and is fixed to the waveguide section 10 by screws 8. Thereby, the plane of the lid 7 is parallel to the flat plate portion 11a of the short-circuit plate 11, as shown in the cross-sectional view of FIG. In this way, the duplexer of this embodiment is manufactured. However, the manufacturing operation can be made easier than before because the short-circuit plate 11 can be easily attached.

Next, the operation of this embodiment will be described.
The operation itself of this embodiment is the same as that of the conventional duplexer. For example, the rectangular main waveguide 1 has a low frequency band equal to or lower than the cutoff frequency of the sub-waveguide 2 and the flat plate portion 11a of the short-circuit plate 11. A first electromagnetic wave having a plane of polarization in a direction perpendicular to the plane of the
When a second electromagnetic wave having a polarization plane in a frequency band higher than the cutoff frequency of the sub-waveguide 2 and in a direction parallel to the plane of the flat plate portion 11a of the short-circuit plate 11 is input, the first electromagnetic wave Propagates through the rectangular main waveguide 1 and further propagates through the rectangular branch waveguide 3 and is output. On the other hand, the second electromagnetic wave propagates through the sub-waveguide 2 and is output. Is not transmitted through the rectangular branch waveguide 3 and output.

On the other hand, when the second electromagnetic wave is input to the sub-waveguide 2, this electromagnetic wave propagates through the sub-waveguide 2, is matched with the rectangular main waveguide 1 by the step converter 4, and The light is introduced into the tube 1, propagated, and output. At this time, the electromagnetic wave introduced from the step converter 4 into the rectangular main waveguide 1 is
Since the light is reflected by the short-circuit plate 11, it is prevented from being introduced into the branch waveguide 3.

According to the duplexer of the first embodiment,
The short-circuiting plate 11 is made of a conductive member independent of the waveguide section 10 and is inserted and fixed in the electromagnetic wave input / output opening 3a such that its plane (flat section 11a) is parallel to the plane of the lid 7. Thereby, the short-circuit plate 11 can be easily formed on the waveguide section 10. Thus, the duplexer can be manufactured more easily than when the short-circuit plate 11 is formed integrally with the waveguide section 10, and the working efficiency can be improved.

Next, a duplexer according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is an exploded perspective view showing a duplexer according to a second embodiment of the present invention. 4A is a sectional view taken along line BB of FIG. 3, and FIG. 4B is a sectional view taken along line CC of FIG.

In the duplexer of this embodiment, as shown in FIG. 3, a projection 11d projecting upward (lid 7) is formed at the center of the flat plate portion 11a of the short-circuit plate 11, and FIG.
As shown in (a) and (b), the short-circuiting plate 11 is connected to the electromagnetic wave input / output opening 3a through the X-axis passing through the center of the rectangular main waveguide 1.
At the same distance from the Y plane to the bottom surface of the rectangular branch waveguide 3, it is configured to be attached to a position opposite to the bottom surface of the rectangular branch waveguide 3.

According to the duplexer of this embodiment having such a configuration, the short-circuiting plate 11 having the projection 11d is formed by the cover 7
A part of the polarized wave (the first electromagnetic wave) having a plane parallel to the XZ plane as a plane of polarization, which is to propagate from the space formed by the first and second plane sections 11a to the branch waveguide 3; All polarized waves with the plane parallel to the Y plane as the plane of polarization (the second electromagnetic wave)
And reflect. Thereby, the electromagnetic wave input / output opening 3a
XY passing substantially through the center of the rectangular main waveguide 1
The XPD can be made symmetrical with respect to the plane, so that it is not necessary to use a high-level technique for precisely and symmetrically notching the aperture of the electromagnetic wave input / output opening 3a as in the prior art, and the XPD can be easily improved. it can.

The duplexer according to the present invention is not limited to the above embodiments. For example, the rectangular branch waveguide 3 of the short-circuit plate 11 may be attached to the electromagnetic wave input / output unit by using a conductive adhesive instead of an elastic force. In this case, since the elastic force is not required for the short-circuit plate, it is possible to use the same conductive material (for example, aluminum, brass, or the like) as that of the waveguide portion 10. A change in conductivity can be eliminated, which is preferable. Further, in each of the above-described embodiments, the plane parallel to the XY plane of the rectangular branch waveguide 3 has been described as the H plane, but it may be branched in the direction of the E plane.

Further, in the second embodiment, the short-circuit plate 11
Although a single protruding portion 11d is formed on the flat portion 11a, a plurality of protruding portions 11d to 11f are formed on the flat plate portion 11a by bending a metal plate member as shown in FIG.
May be formed. Further, as shown in FIGS. 6 and 7, the short-circuit plate 11 may be formed integrally with the flat plate portion 11a, the bent portions 11b and 11c, and the protrusions 11d to 11f by using a metal.

[0033]

As described above, according to the duplexer of the present invention, the short-circuit plate is inserted and fixed to the electromagnetic wave input / output section as a conductive member independent of the waveguide section. A short-circuit plate can be easily formed on the waveguide section. Further, one or more protrusions are formed on the plane of the short-circuit plate, and such a short-circuit plate is formed from the XY plane passing through the center of the rectangular main waveguide to the bottom of the rectangular branch waveguide of the electromagnetic wave input / output unit. At the same distance as above, by mounting the rectangular branch waveguide at a position opposite to the bottom surface, the aperture of the electromagnetic wave input / output unit can be made substantially symmetrical with respect to the XY plane. XPD can be easily improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a duplexer according to a first embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are views for explaining the assembling of main parts of the duplexer, and FIG. 2 (c) is a sectional view taken along the line AA of FIG.

FIG. 3 is an exploded perspective view illustrating a duplexer according to a second embodiment of the present invention.

4A is a sectional view taken along line BB of FIG. 3, and FIG.
FIG. 4 is a sectional view taken along line CC of FIG. 3.

FIG. 5 is a perspective view showing a short-circuit plate of a duplexer according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a short-circuit plate of a duplexer according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a short-circuit plate of a duplexer according to another embodiment of the present invention.

8A and 8B show a duplexer according to a conventional example, in which FIG. 8A is an exploded perspective view, and FIG. 8B is a DD line in FIG.
It is sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectangular main waveguide 2 Subwaveguide 3 Rectangular branch waveguide 4 Step conversion part 7 Lid 10 Waveguide part 11 Short circuit board 11a Plate part 11b, 11c Bend part 11d-11f Projection part 12a, 12b Groove

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-273401 (JP, A) JP-A-3-65805 (JP, A) JP-A-3-106201 (JP, A) JP-A-1- 303801 (JP, A) JP-A-6-85502 (JP, A) JP-A-5-11505 (JP, U) JP-A-3-56206 (JP, U) JP-A-5-15509 (JP, U) Showa 53-77648 (JP, U)

Claims (5)

(57) [Claims] An upper portion of a waveguide portion having a U-shaped longitudinal section and a T-shaped groove formed thereon is covered with a flat plate-like lid, so that one end has an opening of a rectangular main waveguide, The other end has an opening of a sub-waveguide that is connected in series to the rectangular main waveguide and cuts off electromagnetic waves in a low frequency band equal to or less than a predetermined value. One end is connected near the connecting portion of the waveguide, and the other end of the polarized electromagnetic wave, which is introduced from the opening of the rectangular main waveguide and has a polarization plane orthogonal to the plane of the lid, out of the electromagnetic waves orthogonally polarized to each other. In the duplexer in which a rectangular branch waveguide derived to the above is formed, an electromagnetic wave input / output opening near the connection between the rectangular main waveguide and the sub-waveguide of the rectangular branch waveguide includes the waveguide. independently of the pipe section is inserted and fixed, as well as provided with a conductive shorting plate having a plane parallel to the plane of the lid, the絡板is, the electromagnetic wave output opening, the rectangular main
From the XY plane passing through the center of the waveguide, the rectangular branch waveguide
At the same distance as the bottom surface, the bottom surface of the rectangular branch waveguide
And the plane of the short-circuit plate
A duplexer , wherein one or more projections projecting toward the lid are formed on the upper side . 2. When the short-circuit plate is made of a metal plate member.
Together, Bend both ends of this metal plate member toward the lid side
The short-circuit plate is formed to have a U-shaped longitudinal section.
The duplexer described. 3. When the short-circuit plate is made of a metal plate member.
Together, A substantially center of the metal plate member protrudes toward the lid.
And formed on the short-circuit plate.
The duplexer according to claim 1 or 2, wherein the duplexer is formed. 4. The short-circuit plate is press-fitted into a groove formed in a tube wall of an electromagnetic wave input / output opening of the rectangular branch waveguide before the step of attaching the lid to the waveguide portion. 4. The duplexer according to claim 1, wherein the duplexer is an elastic member fixed by an elastic force. 5. The conductive bonding method according to claim 1, wherein the short-circuiting plate is electrically conductively bonded to a groove formed in a wall of an electromagnetic wave input / output opening of the rectangular branch waveguide before the step of attaching the lid to the waveguide. The duplexer according to claim 1, 2 or 3, wherein the duplexer is a conductive member that is adhered and fixed by an agent and is made of the same conductive material as the waveguide section.