JPH0832324A - Dielectric resonator - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To prevent the resonance frequency from changing due to external conditions such as components close to the resonator, and to realize a structure that reduces the dielectric length. According to the present invention, at least one open end structure is
At least a part of the open end face is provided with an end face conductor layer which is DC-connected to the outer peripheral face conductor layer 4, and a recess 13 is provided on the outer face to form a dielectric resonator. [Effect] The size of the resonator can be reduced. The resonance frequency does not change due to external conditions such as parts close to the resonator. Further, unlike the short-circuited surface of the short-circuiting type λ / 4 resonator, no conductor loss occurs in the end-face conductor layer, so that Q
The factor does not decrease.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a λ / 2 resonator in which a conductor layer is formed on a dielectric block and used as an electrode, in which the resonance frequency changes depending on the external conditions such as the components close to the resonator. We propose a structure that prevents the dielectric length and reduces the dielectric length.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a conventional example of an open type λ / 2 resonator. In the figure, 111 is a dielectric pillar having a length of λ / 2 for a desired frequency, 112 is a through hole, and 1 is a through hole.
Reference numeral 13 is an inner conductor layer, and 114 is a grounded outer conductor layer. Since the inner conductor layer 113 and the outer conductor layer 114 are not connected at all as apparent from the figure, both ends of the dielectric pillar 111 are electrically open. Of the open ends, 115 is an input end and 116 is a reflection end, and the input end 115
When a signal of a desired frequency is input from, an electromagnetic field as shown in FIG. 4 occurs and resonates.

The unloaded Q and Q0 of such an open type λ / 2 resonator are generally

[0004]

[Equation 1]

It is represented by However, Qcy and Qd are Q factors due to conductor loss and dielectric loss, respectively.

On the other hand, FIGS. 5 and 6 show conventional examples of a short-circuiting type λ / 4 resonator. In the figure, 121 is a dielectric pillar having a length of λ / 4 for a desired frequency, 122 is a through hole, 123 is an inner conductor layer, and 124 is an outer conductor layer which is grounded. Inner conductor layer 123 and outer conductor layer 124
Are electrically connected at one end surface 127 of the dielectric column 121, and this end surface 127 is an electrically short-circuited end. At this time, when a signal having a desired frequency is input from the end face 125 opposite to the short-circuit end 127, an electromagnetic field as shown in FIG. 6 occurs and resonates.

In such a short circuit type λ / 4 resonator, in addition to the loss described in the open type λ / 2 resonator, the conductor loss Qcp of the short circuit surface is
Therefore, the unloaded Q and Q0 of the resonator are

[0008]

[Equation 2]

It is represented by

Generally, the short-circuit end 12 of the short-circuiting type λ / 4 resonator is used.
Since No. 7 corresponds to the point of maximum current, the conductor loss becomes very large, and the open λ / 2 resonator is superior to the short circuit λ / 4 resonator in terms of Q factor.

However, the size of the open type λ / 2 resonator is, in principle, twice as large as that of the short circuit type λ / 4 resonator. In addition to this, unlike the short-circuiting type λ / 4 resonator, since the reflection end 116 is not shielded, if a component or the like is placed close to the reflection end 116, the resonance frequency changes, so that at least 2 to 3 mm. It was not possible to put parts etc. within a certain range. Therefore, the area occupied by using the open type λ / 2 resonator is much larger than that of the short circuit type λ / 4 resonator.

[0012]

As described above, the conventional open type λ / 2 resonator has the size of the short type λ / 4 resonator.
In addition, since the reflection end 116 is not shielded, there is a problem that the resonance frequency changes when a component or the like is placed close to the reflection end 116. The purpose of the present invention is to
In an open type λ / 2 resonator, it is to realize a structure in which the resonance frequency is prevented from changing due to an external condition such as a component close to the resonator and the dielectric length is reduced.

[0013]

To achieve the above object, the present invention provides a dielectric resonator in which a conductor layer is provided on at least the entire outer peripheral surface of a dielectric column having a central hole and the inner peripheral wall of the central hole. In, a dielectric resonator is formed by forming a concave portion on the outer peripheral surface and forming an end surface conductor layer DC-connected to the outer peripheral surface conductor layer on a part of at least one open end surface of the dielectric pillar. .

[0014]

According to the present invention, the conductor layer is formed in the concave portion provided on the outer peripheral surface as described above, and the electric capacity is formed together with the conductor layer on the inner wall of the center hole. Therefore, the size of the resonator can be reduced. . Further, since the end face conductor layer provided on the end face of the dielectric column functions to shield the inner conductor, the resonance frequency does not change depending on the external conditions such as the components close to the resonator.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an open type λ / 2 resonator according to the present invention, and FIG. 2 is an exploded perspective view of the open type λ / 2 resonator according to the present invention. It is a dielectric block.

In FIG. 2, reference numeral 8 has a through hole 2 in the center, and a conductor layer is provided on the entire outer peripheral surface except the connection end surface 9 which is one end surface and the vicinity of the through hole 2 and the inner wall of the through hole 2. It is a square pole input end side dielectric block made of ceramic or the like.

Reference numeral 10 is a rectangular prism-shaped reflecting end side dielectric block made of ceramic or the like having a conductor layer on the entire outer peripheral surface except the connecting end surface 9 which is one end surface.

Further, the central dielectric block 11 has a through hole 2 in the center, and a ceramic having a conductor layer on the entire outer peripheral surface except a part of the connection end surface 9 which is both end surfaces and the inner wall of the through hole 2. It is a central part dielectric block of a square pole formed by the above.

The input end side dielectric block 8 and the reflection end side dielectric block 10 are formed so that one side of the cross section is smaller than the central part dielectric block 11.

When the input end side dielectric block 8, the central part dielectric block 11 and the reflection end side dielectric block 10 are connected, an open type λ / having a vertical cross section as shown in FIG.
Two resonators are formed.

In FIG. 1, at the center of the dielectric pillar 1, a through hole 2 is provided at the center of the dielectric block 8 on the input end side and the dielectric block 11 on the central portion, so that the input end 5 to the reflecting end 6 are formed. Until immediately before, the center hole 12 having the inner conductor layer 3 is formed on the wall surface thereof. Further, on the outer peripheral surface of the dielectric pillar 1, the input end 5 is formed by the outer conductor layer 4 provided on the outer periphery of the input end side dielectric block 8, the central part dielectric block 11 and the reflection end side dielectric block 10. Center hole 1
The outer conductor layer 4 is formed on the entire surface except for a part near 2.

Since the dielectric block 8 on the input end side and the dielectric block 10 on the reflective end side are formed so that one side of the cross section is smaller than the central dielectric block 11, the input end of the dielectric column 1 is formed. A concave portion 13 is provided in the vicinity of 5 and the reflection end 6.

Inside the dielectric pillar 1, in the vicinity of the input end 5 and the reflection end 6 where the voltage is maximum, the central dielectric block 11 is formed.
Of the outer conductor layer 4, the input end side dielectric block 8, and the central dielectric block 11 formed on a part of the connection end face 9 of
Also, an electric capacitance is formed between the outer conductor layer 4 provided on the outer periphery of the reflective end side dielectric block 10 and the inner conductor layer 3 formed on the inner wall of the center hole 12. Therefore, the size of the resonator can be reduced.

Further, in this embodiment, the end face of the reflecting end 6 is
Since the conductor layer is formed on the entire surface, the resonance frequency does not change depending on the external conditions such as the components close to the resonator. Further, the reflection end 6 and the input end 5 are located at the position where the current is minimum, and conductor loss does not occur unlike the short-circuit surface of the short-circuiting type λ / 4 resonator, so that the Q factor does not decrease.

As described above, according to the present invention, it is possible to provide a high Q and small size dielectric resonator.

[0027]

As described above, according to the structure and method of the present invention, the outer conductor layer of the recess provided near the open end is provided in the central hole provided inside the dielectric pillar. Since the capacitance is formed together with the internal conductor layer, the size of the resonator can be reduced. Further, since the end face conductor layer provided on the end face of the dielectric pillar functions to shield the inner conductor, the resonance frequency does not change depending on the external conditions such as the parts close to the resonator. Short-circuit type λ /
Unlike the short-circuited surface of the 4-resonator, no conductor loss occurs in the end face conductor layer, so that the Q factor does not decrease.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an open type λ / 2 resonator of the present invention.

FIG. 2 is an exploded perspective view of a dielectric block that constitutes the open type λ / 2 resonator of the present invention.

FIG. 3 is a perspective view of a conventional open type λ / 2 resonator.

FIG. 4 is an explanatory diagram of an electromagnetic field of a conventional open type λ / 2 resonator.

FIG. 5 is a perspective view of a conventional short circuit type λ / 4 resonator.

FIG. 6 is an explanatory diagram of an electromagnetic field of a conventional short-circuiting type λ / 4 resonator.

[Explanation of symbols]

1 Dielectric Column 2 Through Hole 3 Inner Conductor Layer 4 Outer Conductor Layer 5 Input End 6 Reflection End 8 Input End Side Dielectric Block 9 Connection End Face 10 Reflection End Side Dielectric Block 11 Central Dielectric Block 12 Through Hole 13 Recess

Claims (1)

[Claims] 1. A dielectric resonator comprising a dielectric layer provided with a conductor layer on at least the entire outer peripheral surface of a dielectric column and an inner peripheral wall of the central hole, wherein a recess is formed on the outer peripheral surface of the dielectric resonator. A dielectric resonator, wherein an end face conductor layer, which is DC-connected to the outer peripheral face conductor layer, is formed on a part of at least one open end face of the pillar.