JP2590644Y2 - Structure of triplate line-waveguide exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a triplate line-waveguide converter in a millimeter wave band.

[0002]

2. Description of the Related Art In recent years, in order to realize high-efficiency characteristics, a system in which a feed system has a triplate line configuration has become mainstream in a microwave / millimeter wave band planar antenna. In this triplate line feed type planar antenna,
The feed power of each antenna element is combined by a triplate line, and the connection between the final output part of the combined power and a signal processing circuit such as a converter is a triplate line that is easy to assemble and has high connection reliability. -Waveguide converters are often used. Here, a conventional configuration of this triplate line-waveguide converter is shown in FIG. In this conventional configuration,
In order to make the conversion with the waveguide system easy with low loss,
The film substrate 4 on which the stripline conductor 3 is formed via the dielectric 2a is laminated on the surface of the substrate, and the upper ground conductor 5 is further disposed on the surface via the dielectric 2b to form a triplate line. ing. Further, the waveguide input section 6 of the circuit system
At the time of connection, the ground conductor 1 is provided with a through hole having the same size as the inner size of the waveguide, and furthermore, a metal spacer portion 7 for stably holding the film substrate 4 substantially at the middle of the upper base conductor of the triplate line. Is provided, a short-circuited waveguide cap 11 is provided above the film substrate 4, and the film substrate 4 is sandwiched therebetween to form a triplate line-waveguide converter. As shown in FIG. 7, the sandwiching portion of the film substrate 4 has an insertion hole at a position where the stripline conductor 3 is inserted into a waveguide formed by the metal spacer 7 and the inner wall of the short-circuited waveguide cap 11. By using a thin film substrate 4 having a thickness of about 35 μm, a low-loss triplate line-waveguide converter without leakage power can be formed. In FIG. 6, by setting the insertion length A of the stripline conductor 3 in the waveguide and the short-circuit distance L of the short-circuit waveguide cap 11 to predetermined dimensions, a wide band in a desired frequency band and low reflection loss can be obtained. A triplate wire-waveguide converter having characteristics can be realized.

[0003]

In the above-described structure of the conventional triplate line-to-waveguide converter, the short-circuited waveguide cap 11 has a complicated shape and a frequency of 6.
In the millimeter wave band of about 0 GHz, the mechanical dimensions are fine,
High processing accuracy is required. For this reason, inexpensive manufacturing methods such as aluminum die-casting have a problem in that mechanical dimensional accuracy is poor and reflection characteristics are deteriorated, and in manufacturing methods such as cutting, the price is extremely high. SUMMARY OF THE INVENTION The present invention provides an inexpensive triplate line-to-waveguide converter that is easy to assemble and has high connection reliability without deteriorating high-bandwidth and low-loss characteristics.

[0004]

According to the present invention, as shown in FIG. 1, a film substrate 4 on which a strip line conductor 3 is formed is disposed on a surface of a ground conductor 1 via a dielectric 2a.
Further, in the structure of the conversion part of the triplate line and the waveguide system in which the upper ground conductor 5 is disposed via the dielectric 2b on the surface thereof, the connection part of the waveguide input part 6 of the circuit system of the ground conductor 1 is provided. Is provided with a through hole having the same size as the inner size of the waveguide, and a metal spacer portion 7a having a thickness equal to that of the dielectric 2a is provided to hold the film substrate 4, and a metal having the same size as the metal spacer portion 7a is provided. The upper ground conductor 5 having a through hole having the same size as the inner dimension of the waveguide is provided in the ground conductor 1 with the film substrate sandwiched between the spacer portions 7b and the metal spacer portion 7b. The waveguide portion formed by the inner walls of the metal spacer portions 7a and 7b is arranged so that the position of the through hole provided in the upper ground conductor 5 coincides with the waveguide portion, and the through hole provided in the ground conductor 5 is closed. Dispose the short-circuit metal plate 8 and - characterized in that to constitute a waveguide converter.

As shown in FIG. 2, between the upper ground conductor 5 provided with a through-hole having the same size as the inner size of the waveguide and the short-circuit metal plate 8, the same size as the inner size of the waveguide is provided. The metal spacer portion 9 provided with the through hole is disposed such that the position of the through hole provided in the upper ground conductor 5 and the position of the through hole provided in the metal spacer portion 9 coincide with each other. A converter can also be configured. Further, as shown in FIG. 3, a metal part 10 that can be inserted into the waveguide by penetrating the short-circuit metal 8 is provided at the center of the short-circuit metal plate 8 to provide a triplate line-waveguide converter. It can also be configured.

[0006]

According to the present invention, the metal spacers 7a and 7b shown in FIG. 4A can be formed by stamping a metal plate having a desired thickness, and the metal spacer shown in FIG. The part 9 can also be formed by stamping a metal plate having a desired thickness. Here, as shown in FIG. 4C, a metal spacer 7a, a film substrate 4 and a metal spacer are formed on the surface of the ground conductor 1 having a through hole having an inner dimension a × b of the waveguide, as shown in FIG. 7b are sequentially laminated, and a ground conductor 5 having a through hole having an inner dimension a × b of the waveguide shown in FIG. A plate line-waveguide converter can be configured. In this configuration, the thickness of the upper ground conductor 5 is selected such that the sum of the thickness of the metal spacer 7b and the thickness of the upper ground conductor 5 matches the desired short-circuit distance L. And a good triplate line-waveguide converter that is inexpensive and has low reflection loss characteristics over a wide band can be realized.

[0007] As shown in FIG.
The thickness of the upper ground conductor 5 and the thickness of the metal spacer 9 are selected such that the sum of the thickness b, the thickness of the upper ground conductor 5 and the thickness of the metal spacer 9 matches the desired short-circuit distance L. Similarly, the short-circuit metal plate 8 can be accurately arranged at a predetermined position.

Further, as shown in FIG. 3, the frequency characteristic of the reflection loss can be changed by providing the fine adjustment metal portion 10 of the short circuit distance L at the center of the short circuit metal plate 8, so that the waveguide conversion portion can be changed. It is possible to easily correct mechanical assembly errors. When assembling the components, the insertion length A of the strip line conductor 3 into the waveguide is set to a desired value, and the through-hole of the ground conductor 1 and the metal spacers 7a, 7b are formed.
In order to maintain the mechanical continuity of the inner wall of the waveguide and the wall of the waveguide section formed by the through hole of the upper ground conductor 5, the positional accuracy of each component is assembled by a guide pin or the like and fixed by screws or the like. Needless to say, it is desirable.

[0009]

Embodiment 1 FIG. 1 shows one embodiment of the present invention. In this configuration, an aluminum plate having a thickness of 3 mm as a ground conductor is
As the film conductor 4, a Teflon sheet having a thickness of 0.5 mm and a relative dielectric constant of about 2.1 is used. An aluminum plate having a thickness of 0.7 mm was used. Also, metal spacer portions 7a, 7b
A 0.5 mm thick aluminum plate was used, and a 2 mm thick aluminum plate was used as the short-circuit metal plate 8. Here, a strip line conductor 3 having a square end of 0.7 mm square at the end of a straight line having a line width of 0.5 mm was formed on the film substrate 4 by etching. The ground conductor 1 and the upper ground conductor 5 have a = 1.88 mm and b = 3.76 m, which are equal to the inner dimensions of the connection waveguide, as shown in FIG.
m through-holes were formed by punching. FIG. 4
The dimensions of the metal spacer portions 7a and 7b shown in FIG.
= 1.88mm, b = 3.76mm, c = 1.5mm,
It was formed by punching with d = 1.26 mm, and the short-circuit metal plate 8 was also formed by punching the outer shape in the same manner.
Further, in the configuration of FIG. 1, the insertion length A of the stripline conductor 3 into the waveguide is set to A = 1.25 mm, and the ground conductor 1
And the through hole of the upper ground conductor 5 and the metal spacer portions 7a, 7
In order that the positions of the inner wall portions indicated by the dimension a and dimension b of b correspond to each other with high precision, they are stacked and arranged by a guide pin or the like penetrating the material of each part, and the ground is passed through the respective members from the upper surface of the short-circuit metal plate 8. The conductor 1 was fixed by screwing. At this time,
The desired short-circuit distance L was kept at L = 1.2 mm by the thickness of the metal spacer portion 7b and the upper ground conductor 5. The input unit and the output unit were formed symmetrically with the components described above with reference to FIG. 1, the waveguide end was connected to one output unit, and the waveguide was connected to the input unit. Is shown in FIG.
In the desired 59.5 GHz band, the reflection loss has a characteristic of -40 dB or less, and is -2 over a wide frequency band.
Low reflection loss characteristics of 0 dB or less were obtained.

Embodiment 2 FIG. 2 shows another embodiment of the present invention. This configuration uses a conductor having a thickness of 18 μm as the upper ground conductor 5 and a = 1.88 m
A hole of m and b = 3.76 mm was provided, and a 0.7 mm-thick aluminum plate was used as the metal spacer 9 in FIG.
A = 1.88 mm, b = 3.76 mm as shown in FIG.
Example 1 is the same as Example 1 except that the through hole is formed by punching.

Embodiment 3 FIG. 3 shows another embodiment of the present invention. This configuration is the same as that of Embodiments 1 and 2 except that a screw 10 having a thickness of 1.2 mm is passed through the center of the short-circuited metal plate 8. When the tip of the screw 10 is inserted into the center of the wave tube part by 0.5 mm, the frequency band in which the reflection loss is -40 dB or less in the characteristics shown in FIG. 5 is adjusted to a frequency higher by about 1 GHz. Was completed.

[0012]

As described above, according to the present invention, the components such as the metal spacers 7a, 7b, 9 and the upper ground conductor 5 and the ground conductor 1 are formed by punching a metal plate having a desired thickness. Therefore, an inexpensive triplate line-waveguide converter that is easy to assemble and has high connection reliability can be realized without deteriorating the conventional wideband and low-loss characteristics.

[Brief description of the drawings]

FIG. 1A is a top view showing an embodiment of the present invention, and FIG. 1B is a sectional view thereof.

FIG. 2A is a top view showing another embodiment of the present invention, and FIG. 2B is a sectional view thereof.

FIG. 3A is a top view showing still another embodiment of the present invention, and FIG. 3B is a cross-sectional view thereof.

4 (a) to 4 (c) are top views each showing a part of an embodiment of the present invention.

FIG. 5 is a diagram illustrating a relationship between frequency and return loss according to an embodiment of the present invention.

6A is a top view showing a conventional example, and FIG. 6B is a cross-sectional view thereof.

FIG. 7 is an exploded perspective view showing a part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground conductor 2a Dielectric 2b Dielectric 3 Strip line conductor 4 Film substrate 5 Upper ground conductor 6 Circuit waveguide part 7a Metal spacer part 7b Metal spacer part 8 Short-circuit metal plate 9 Metal spacer part 10 Short-circuit distance adjustment metal part 11 Shorted waveguide cap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-46403 (JP, A) JP-A-3-6104 (JP, A) JP-A-59-117804 (JP, A) 46109 (JP, U) Actually open sho 59-42610 (JP, U) Actually open sho 54-61510 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01P 5/107 H01P 5 / 04 603

Claims (3)

(57) [Scope of request for utility model registration] 1. A film substrate 4 on which a stripline conductor 3 is formed is laminated on a surface of a ground conductor 1 via a dielectric 2a, and an upper ground conductor 5 is further formed on the surface thereof via a dielectric 2b. In the replacement part structure of the arranged triplate line and the waveguide 6, a through hole having the same size as the inner size of the waveguide 6 is provided at a connection position between the ground conductor 1 of the ground conductor 1 and the waveguide. Further, a metal spacer portion 7a having a thickness equal to that of the dielectric 2a is provided on the holding portion of the film substrate 4,
The film substrate 4 is sandwiched between the metal spacer portions 7b having the same dimensions as the above, and the waveguide 6 is disposed above the metal spacer portions 7b.
Characterized in that an upper ground conductor 5 having a through hole of the same size as that of the ground conductor 5 is disposed, and a short-circuit metal plate 8 is disposed above the through hole provided in the ground conductor 5.
Structure of waveguide converter. 2. Between the upper ground conductor 5 and the short-circuit metal plate 8,
The structure of a triplate line-waveguide converter according to claim 1, wherein a metal spacer portion (9) having a through hole having the same size as the inner size of the waveguide (6) is provided. 3. The trike according to claim 1, wherein a metal portion is provided at a central portion of the short-circuit metal plate so as to penetrate the short-circuit metal plate and be inserted into the waveguide. Structure of a plate line-waveguide converter.