Coaxial resonator, and dielectric filter and dielectric...

Details Coaxial resonator, and dielectric filter and dielectric... Coaxial resonator, and dielectric filter and dielectric...

2001-09-26

2003-03-04

Tokar, Michael (Department: 2819)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S202000, C333S206000, C333S222000, C333S191000

Reexamination Certificate

active

06529097

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to coaxial resonators having a reduced number of components and which can be manufactured by a simplified process, and to dielectric filters and dielectric duplexers including such resonators.
BACKGROUND OF THE INVENTION
As shown in
FIG. 8
which is an equivalent circuit diagram of the present invention, dielectric duplexers
40
for use in communications devices for transmitting and receiving high-frequency signals of hundreds of megahertz to several gigahertz comprise a band-reject dielectric filter
42
on the receiving side, and a band-pass dielectric filter
43
on the receiving side which are electrically connected to a common antenna ANT.
The band-reject dielectric filter
42
and the band-pass dielectric filter
43
each include a plurality of coaxial dielectric resonators
11
,
11
,
11
mounted on an electrically conductive pattern
71
on a substrate
70
and electrically connected together by an inductance L, capacitors C, etc. (see
FIG. 9
of the invention). Some of the inductance L and capacitors C in
FIG. 9
are formed directly on the pattern
71
on the substrate
70
.
The coaxial dielectric resonators to be mounted on the substrate
70
include a ¼ wavelength resonator
11
. With reference to
FIG. 11
, this device comprises a dielectric block
12
having a through- bore
13
extending through opposite end faces thereof, and a conductor layer
14
formed over the outer peripheral surface of the block
12
except one end face thereof and over the block inner surface defining the through-bore
13
. This resonator causes electromagnetic waves having a wavelength equal to ¼ of the length of the resonator to resonate within the dielectric block
12
.
The resonators
11
mounted on the substrate
70
include one electrically connected in series with an electric element such as an inductance or a capacitor, as indicated at
10
in the equivalent circuit diagram of FIG.
8
. The resonator
11
is connected to the electric element
22
conventionally by using a tubular member
90
which is made by shaping a conductive metal into a tubular form as shown in FIG.
10
and which has a tongue
91
projecting from one end of the tubular member The resonator
11
is electrically connected in series with the electric element
22
by inserting the tubular member
90
into the through-bore
13
of the resonator
11
, as shown in
FIG. 10
, mounting the resonator
11
on the substrate
70
, and thereafter soldering the tongue
91
of the tubular member
90
to a lead
23
of the electric element
22
as at
93
on a conductive plate
92
, as shown in FIG.
11
. electric element
22
as at
93
on a conductive plate
92
as shown in FIG.
11
.
The electrical connection of the resonator
11
to the inductance or like electric element
22
thus necessitates the tubular member
90
and the conductive plate
92
, which therefore increase the number of work steps involved in mounting and the number of parts, while the substrate
70
requires a space for providing the conductive plate
92
. Accordingly, difficulties are encountered in making dielectric filters
41
or dielectric duplexers
40
comprising resonators
11
more compact.
An object of the present invention is to provide a coaxial resonator which can be electrically connected to an inductance or like electric element easily to reduce the number of work steps for mounting and the number of parts, and a dielectric filter and a dielectric duplexer which comprise the resonator and which can be compacted and installed in a diminished space.
SUMMARY OF THE INVENTION
To fulfill the above object, the present invention provides a coaxial resonator comprising a dielectric block having a through-bore extending through opposite end faces thereof, and a conductor layer formed over an outer peripheral surface of the block except one end face thereof and over a block inner surface defining the through bore for causing electromagnetic waves to resonate within the dielectric block. A lead-equipped electric element has its lead inserted in the through-bore and electrically connected to the conductor layer over the bore-defining inner surface with a braze filler metal or electrically conductive adhesive, and the lead is fixed in the through-bore.
The present invention provides a dielectric filter including a plurality of coaxial resonators. The coaxial resonator described is used as at least one of these coaxial resonators.
The present invention further provides a dielectric duplexer comprising a band-reject filter for transmitting and a band-pass filter for receiving which are electrically connected to an antenna ANT. The dielectric filter described is used as the band-reject filter and/or the band-pass filter.
The coaxial resonator of the present invention can be electrically connected to the lead of an inductance or like electric element by inserting the lead directly into the through-bore of the resonator and brazing the lead to the bored portion with a braze filler metal. An electrically conductive adhesive can be used in place of the braze filler metal.
The coaxial resonator of the present invention requires none of parts such as a tubular member and conductive plate, thus serving to reduce the number of parts. Because the lead of the electric element is joined to the resonator by direct brazing or using a conductive adhesive, the number of work steps conventionally needed for mounting can be diminished. The reductions in the number of parts and the number of work steps achieve improvements in the reliability of the product.
The dielectric filter and the dielectric duplexer of the present invention include a coaxial resonator, which can be electrically connected directly to the lead-equipped electric element without necessitating a conductive plate or the like. This serves to reduce the number of work steps and the number of parts, further eliminating the need for a space for the provision of the conductive plate. The filter and the duplexer can therefore be made more compact. Because the coaxial resonator of the present invention has an improved reliability as stated above, the filter and the duplexer including the resonator are also improved in reliability.


REFERENCES:
patent: 4567454 (1986-01-01), Saito
patent: 4965537 (1990-10-01), Kommrusch
patent: 5144269 (1992-09-01), Itoh
patent: 5379011 (1995-01-01), Sokola et al.
patent: 5602518 (1997-02-01), Clifford et al.
patent: 5783978 (1998-07-01), Noguchi et al.
patent: 5999070 (1999-12-01), Endo
patent: 6188299 (2001-02-01), Kawase et al.

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