Dielectric resonator, dielectric filter, dielectric...

Details Dielectric resonator, dielectric filter, dielectric... Dielectric resonator, dielectric filter, dielectric...

1999-04-28

2001-04-03

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Resonators

Dielectric type

C333S202000, C333S134000

Reexamination Certificate

active

06211755

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dielectric resonator, a dielectric filter, a dielectric duplexer, and a communication device each for use in a communication base station, and a method of producing a dielectric resonator.
2. Description of the Related Art
Such dielectric resonator and dielectric filter will be described with reference to
FIGS. 12 through 14
.
FIG. 12
is a perspective view of the dielectric resonator.
FIG. 13
is a partly cross sectional view of one end of the dielectric resonator.
FIG. 14
is an exploded perspective view of the dielectric filter. In this case, the filter will be described by use of a two stage band-elimination dielectric filter in which two dielectrics are connected with a quarter-wave line. This filter was not a publicly known conventional technique when Japanese Patent Application No. 10-118933, which is a basis of claim of priority for the application of the present invention, was filed.
As shown in
FIGS. 12 and 13
, a dielectric resonator
110
is composed of a columnar dielectric
111
, and thin film multi-layers
112
formed on the opposite sides of the dielectric
111
. In the case that the thin film multi-layer electrodes
112
are employed as the electrodes of the dielectric resonator
110
, the nonloaded Q of the dielectric resonator
110
is enhanced. As compared with monolayer silver electrodes used as the electrodes, the dielectric resonator with high characteristics can be provided.
In addition, as shown in
FIG. 14
, a dielectric filter
120
is made up of a shield cavity
121
made of iron or the like, two dielectric resonators
110
arranged in the shield cavity
121
, and a ground plate
122
, electrical probes
123
as external coupling means, and external connectors
124
attached to the shield cavity
121
.
As described above, each dielectric resonator
110
is formed of the columnar dielectric
111
having the thin film multi-layer electrodes
112
formed on the opposite sides thereof. One electrode surface of the dielectric resonator
110
is soldered to the ground plate
122
having a step
122
a
and a hole
122
b
for soldering. The ground plate
122
is sandwiched between the body
121
a
of the shield cavity
121
and a lid
121
b
. Thus, the dielectric resonator
110
is arranged in the shield cavity
121
. In addition, the electrical probes
123
are connected at one end to the center conductors of the external connectors
124
, respectively, and are elongated in the spaces between the dielectric resonators
110
and the shield cavity
121
. Moreover, the center conductors of the two external connectors
124
are connected through a quarter-wave line
125
.
In the dielectric filter
120
having the above-described configuration, an input signal, when it is input through the external connectors
124
, is transmitted to the electrical probes
123
, so that the electrical probes
123
and the dielectric resonators
110
are capacitively coupled. Then, the dielectric resonators
110
resonate at a resonant frequency determined by the shapes and sizes of the dielectric resonators
110
. Thus, the dielectric filter
120
in which the dielectric resonators are connected through the quarter-wave line
125
for connection is provided functions as a band-elimination dielectric filter for eliminating the desired frequency.
In general, a great number of dielectric resonators having a predetermined diameter and thickness are produced at one time. Accordingly, in order to allow the dielectric resonators to be used in dielectric filters of which the frequency characteristics are different, it is necessary to adjust the resonant frequencies of the dielectric resonators in correspondence to the frequencies. To make this adjustment, in the above-described dielectric resonator, it is possible to cut either the peripheral side-face of the dielectric resonator having thin film multi-layer electrodes formed on the opposite sides thereof, including the thin film multi-layer electrodes, to partially cut or the thin film multi-layer electrodes.
However, as shown in
FIG. 15
, if the adjustment of the resonant frequency is carried out by the above-described method, for example by cutting, the peripheral side-face of the dielectric
111
, in the thin film multi-layer electrode
112
comprising metallic layers
112
a
made of copper or the like and dielectric layers
112
b
, due to the rolling properties of the metallic layers
112
a
, a part of the metallic layers
112
a
of the thin film multi-layer electrode
112
will be short circuited, so that the nonloaded Q of the dielectric resonator
110
will be reduced. Therefore, after the peripheral side-face is cut to adjust the resonant frequency of the dielectric resonator, etching or the like is required to remove the short circuiting portion of the thin film multi-layer electrode. Thus, the number of production processes is increased.
Further, to adjust the resonant frequency of the dielectric resonator, a method of cutting the dielectric portion of the dielectric resonator excluding the thin film multi-layer electrode may be proposed. However, to adjust roughly the resonant frequency, it is required to cut an amount of the dielectric. When the dielectric of the dielectric resonator is partially removed, the symmetric structure of the dielectric resonator is unbalanced, so that the current distribution becomes uneven, and the nonloaded Q of the dielectric resonator is reduced.
SUMMARY OF THE INVENTION
In view of the foregoing, a dielectric resonator, a dielectric filter, a dielectric duplexer, a communication device, and a method of producing the dielectric resonator of the present invention have been devised. Accordingly, it is an object of the present invention to solve the above-described problems and to provide a dielectric resonator, a dielectric filter, a dielectric duplexer, and a communication device each having a high nonloaded Q. and a method of producing the dielectric resonator.
According to the present invention, there is provided a dielectric resonator which comprises a substantially columnar dielectric, a thin film multi-layer electrode formed on at least one of two faces opposite to each other of the dielectric, and a concave portion formed substantially evenly on the peripheral side-face of the dielectric.
A dielectric filter of the present invention comprises a shield cavity with conductive properties, a dielectric resonator, and an external coupling means to be coupled to the dielectric resonator, the dielectric resonator including a substantially columnar dielectric arranged in the shield cavity, a thin film multi-layer electrode formed on at least one of two faces opposite to each other of the dielectric, and a concave portion formed substantially evenly on the peripheral side face of the dielectric.
A dielectric duplexer of the present invention comprises a shield cavity with electroconductive properties, a dielectric resonator, an external coupling means to be coupled to the dielectric resonator, and an input-output connection means connected to the external coupling means and an antenna connection means, the dielectric resonator including a substantially columnar dielectric arranged in the shield cavity, a thin film multi-layer electrode formed on at least one of two faces opposite to each other of the dielectric, and a concave portion formed substantially evenly on the peripheral side face of the dielectric.
A communication device of the present invention comprises a dielectric duplexer, one of a transmission circuit and a receiving circuit connected to the dielectric duplexer, and an antenna connected to said dielectric duplexer, the dielectric duplexer including a shield cavity with conductive properties, a dielectric resonator, an external coupling means to be coupled to the dielectric resonator, an input-output connection means connected to the external coupling means and an antenna connection means, the dielectric resonator including a substantially columnar dielectric arranged in the shield cavity

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