Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2003-05-27
2004-03-16
Martin, David (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S816000, C361S818000, C174S034000, C174S034000
Reexamination Certificate
active
06707687
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connection structure for a radio frequency circuit, which is suitable for use in receiving converters for satellite broadcasting and the like.
2. Description of the Related Art
A conventional connection structure for a radio frequency circuit will be described with reference to
FIG. 13
(hereunder, radio frequency is abbreviated as RF). A printed circuit board
51
is provided with a wiring pattern
52
on one side, and the wiring pattern
52
mounts various electric components (not illustrated) to form a desired RF circuit.
The wiring pattern
52
includes first and second conductors
52
a
,
52
b
that are located with a space in between, and a third conductor
52
c
that passes between the first and second conductors
52
a
,
52
b.
A grounding pattern
53
for shielding is provided on all the other side of the circuit board
51
, which is not illustrated here. The circuit board
51
thus constructed is attached to a frame, in such a manner that the electric components are located inside the frame, and the grounding pattern
53
is exposed outside the frame. The grounding pattern
53
together with the frame plays a role of shielding the electric components.
A jumper member
54
is made up with a pipe-formed shield
55
made of phosphor copper, an insulator
56
molded inside the shield
55
, and a jumper line
57
buried in the center of the insulator
56
.
The jumper line
57
has a straight base part
57
a
, and a pair of terminals
57
b
bent at a right angle to the base part
57
a
from both ends thereof, thus forming a U-shaped structure. The center of the base part
57
a
is retained by the insulator
56
, and is shielded by the shield
55
. Both the ends of the base part
57
a
and the terminals
57
b
are exposed from the shield
55
.
The jumper member
54
is placed on the side of the grounding pattern
53
of the circuit board
51
, which is exposed outside, and the shield
55
is soldered on the grounding pattern
53
.
The pair of terminals
57
b
of the jumper line
57
are inserted through holes
51
a
of the circuit board
51
, and are each soldered to the first and second conductors
52
a
and
52
b
. Thus, the jumper line
57
is connected to the first and second conductors
52
a
,
52
b
so as to intersect the third conductor
52
c.
In the jumper member
54
used in the conventional connection structure for an RF circuit, since the insulator
56
and the jumper line
57
are molded in the shield
55
, the production cost becomes expensive, and this is a problem to be solved.
Further, both the ends of the base part
57
a
and the terminals
57
b
are exposed outside the shield
55
, and when the jumper member
54
is mounted on the circuit board
51
, both the ends of the base part
57
a
and the terminals
57
b
are exposed from the grounding pattern
53
, which deteriorates the RF characteristics.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a connection structure for an RF circuit that exceeds in the RF characteristics at a low cost.
According to one aspect of the invention, the connection structure for an RF circuit is provided with a circuit board that mounts electric components on a wiring pattern provided on one side thereof to form a desired RF circuit, a grounding pattern provided on another side of the circuit board, and a jumper member provided on the other side of the circuit board. The jumper member is made up with a boxed-shaped cover with a lower side open, an insulating base contained inside the cover, and a jumper line of which both ends are projected downward from a lower side of the insulating base in a state that the jumper line is positioned by the insulating base. The jumper line has a base part that is positioned by the insulating base, and is placed inside the cover to be electrically shielded, and terminals projected downward from the lower side of insulating base. The wiring pattern includes first and second conductors and a third conductor that passes between the first and second conductors. As to the jumper member provided on the other side of the circuit board, the insulating base having positioned the jumper line is mounted on the circuit board. The terminals are inserted through the circuit board to be connected to the first and second conductors in a state that the jumper line intersects the third conductor. And, the cover is attached to the circuit board in a state that the lower ends of cover are put into contact with the grounding pattern.
According to another aspect of the invention, a whole circumference of the cover is soldered to the grounding pattern.
According to another aspect of the invention, the jumper line has a straight base part and a pair of terminals that are bent from both ends of the base part. The insulating base has a longitudinal through hole, and the base part is inserted through the through hole, whereby the jumper line is positioned and retained.
According to another aspect of the invention, the jumper line has a straight base part and a pair of terminals that are bent from both ends of the base part. The base part is placed in a groove provided on an upper part of the insulating base, whereby the jumper line is positioned.
According to another aspect of the invention, the jumper line has a straight base part and a pair of terminals that are bent from both ends of the base part. The terminals are inserted through vertical holes provided on the insulating base, whereby the jumper line is positioned and retained.
According to another aspect of the invention, the circuit board is attached to an open part provided to one side of a frame, the electric components are located inside the frame, and the grounding pattern and the jumper member are exposed outside the frame.
According to another aspect of the invention, a feeder horn is attached to the grounding pattern to be located outside the frame to form a receiving converter for satellite broadcasting.
REFERENCES:
patent: 5297007 (1994-03-01), Deyo et al.
patent: 5635754 (1997-06-01), Strobel et al.
patent: 5763824 (1998-06-01), King et al.
patent: 6462960 (2002-10-01), Watanabe
patent: 6485595 (2002-11-01), Yenni et al.
patent: 07-240576 (1995-09-01), None
Kogasaka Yoshinori
Matsuzaki Satoru
Saito Shuji
Sato Keiichiro
Alps Electric Co. ,Ltd.
Levi Dameon E
Martin David
LandOfFree
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