Wave transmission lines and networks – Resonators
Reexamination Certificate
2002-11-20
2004-11-23
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Resonators
C333S219100
Reexamination Certificate
active
06822539
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dielectric resonance device suitable for use in a converter for receiving satellite broadcasting, and the like.
2. Description of the Prior Art
With reference to
FIG. 5
, the description will be made of structure of a conventional dielectric resonance device. A dielectric resonator
51
made of a ceramic material is formed in a cylindrical column shape, and an undersurface
51
a
thereof is formed into a flat surface.
A pedestal
52
made of a ceramic material or the like is formed into a column shape such as a cylindrical column shape having a diameter smaller than that of the dielectric resonator
51
, and has a joint surface
52
a
made up of a flat surface located in the upper part, and a protrusion
52
c
protruding downward from the central portion of a lower part
52
b.
Thus, by pressing the undersurface
51
a
of the dielectric resonator
51
against the joint surface
52
a
in a state in which an adhesive
53
has been provided on the joint surface
52
a
, the dielectric resonator
51
is bonded to the pedestal
52
.
At this time, a state is brought about in which the adhesive
53
is squeezed out from between the joint surface
52
a
and the undersurface
51
a.
Also, the pedestal
52
to which the dielectric resonator
51
has been bonded is placed on a mounting member
54
made up of a circuit substrate or the like, and both are positioned by fitting the protrusion
52
c
into a hole
54
a
provided in the mounting member
54
. In such a positioned state, the pedestal
52
is mounted to the mounting member
54
.
In the conventional dielectric resonance device, since the flat undersurface
51
a
of the dielectric resonator
51
is bonded to the flat joint surface
52
a
of the pedestal
52
with the adhesive
53
, the adhesive
53
is squeezed out from between the joint surface
52
a
and the undersurface
51
a
, and this leads to a problem of deteriorated performance such as frequency drift and Q-value reduction.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a dielectric resonance device with stabilized electric performance without any adhesive being squeezed out.
In order to solve the above-described problem, as first solution means, the structure is arranged such that there are provided a column-shaped dielectric resonator and a column-shaped pedestal bonded to the undersurface of the dielectric resonator with the adhesive, for supporting the dielectric resonator, that on a joint surface between the pedestal and the dielectric resonator, there is provided an adhesive collecting recess so as not to reach a side of the pedestal, and that the joint surface and the undersurface of the dielectric resonator are bonded to each other with the adhesive.
Also, as second solution means, the structure is arranged such that the recess is provided in a central portion of the joint surface.
Also, as third solution means, the structure is arranged such that the joint surface and the undersurface of the dielectric resonator are bonded to each other in a state in which the adhesive has been provided on the joint surface located in vicinity of the recess.
Also, as fourth solution means, the structure is arranged such that the recess is formed in an annular shape leaving an island-shaped portion in the central portion of the joint surface.
Also, as fifth solution means, the structure is arranged such that the island-shaped portion, which is the joint surface, is bonded to the undersurface of the dielectric resonator in a state in which an adhesive has been provided on the island-shaped portion.
REFERENCES:
patent: 5200721 (1993-04-01), Mansour
patent: 0 419 938 (1991-04-01), None
patent: 07-142911 (1995-06-01), None
patent: 1010326 (1998-07-01), None
patent: 2000244214 (2000-09-01), None
patent: 2000286634 (2000-10-01), None
patent: 2001156670 (2001-06-01), None
patent: 2003124715 (2003-04-01), None
Nakajima Susumu
Nakatsugawa Masahiko
Saito Shuji
Yamaki Yasuo
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Glenn Kimberly
Pascal Robert
LandOfFree
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