Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
2001-08-14
2002-09-24
Tokar, Michael J. (Department: 2819)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C333S033000, C333S248000
Reexamination Certificate
active
06456171
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to probes for a waveguide, and more particularly to two probes that are printed on a circuit board in two substantially rectangular patterns separately located outside a round pattern near a lateral and a lower or an upper side thereof, so that a sufficient cross-polarization isolation exists between the two probes for them to more effectively and stably receive electric waves without interfering-with each other.
FIG. 1
shows a conventional waveguide
10
that includes a cup-shaped tube portion
11
, a body portion
12
, a circuit board
13
, and two probe pins
14
,
15
. The probe pins
14
,
15
are spaced from and perpendicular to each other, so as to receive waves from different directions and then transmit the received waves as signals to the circuit board
13
, at where the received signals are processed.
The probe pins
14
,
15
for the conventional waveguide
10
have the following disadvantages:
1. The probe pins
14
,
15
are three-dimensional members projected from inner surfaces of the waveguide
10
, and are therefore easily broken due to unexpected collision or impact.
2. The probe pins
14
,
15
are three-dimensional members projected from inner surfaces of the waveguide
10
, and therefore occupy considerable space in the waveguide
10
, preventing the waveguide
10
from a small volume.
3. The cup-shaped tube portion
11
must have extended length to accommodate the long probe pins
14
,
15
. For the purpose of eliminating the above-mentioned disadvantages in the conventional waveguide
10
, the inventor of the present invention has developed a waveguide
20
having coplanar printed probes as shown in
FIGS. 2
,
3
and
4
. As shown, the waveguide
20
includes a cup-shaped tube portion
21
, a body portion
22
vertically connected to a rear side of the cup-shaped tube portion
21
, and a circuit board
23
mounted on the body portion
22
and perpendicular to the tube portion
21
. The circuit board
23
is provided thereon with a substantially round pattern
23
a
, as shown in
FIG. 3. A
probe
23
b
is provided on a right side of the round pattern
23
a
, and another probe
23
c
is provided in a substantially rectangular pattern
23
f
to a left side of the round pattern, so that the probes
23
b
and
23
c
are perpendicular to and spaced from each other by a predetermined distance to avoid interference between two electric waves in two directions perpendicular to each other. The cup-shaped tube portion
21
is provided at a position adjacent to the probe
23
c
with a guide slot
23
d
, so that electric waves in the direction of the guide slot
23
d
of the cup-shaped tube portion
21
can be effectively received by the probe
23
c
and converted into electronic signals.
An advantage of the above-mentioned waveguide
20
is that the provision of the printed patterns and the guide slot
23
d
allows the coplanar probes
23
b
and
23
c
to be spaced from each other by a predetermined distance, so that electric waves could be effectively processed without causing wave interference.
However, since the probe
23
b
is provided in the round pattern
23
a
, there is an insufficient cross-polarization isolation between the probe
23
b
and the probe
23
c
provided in the rectangular pattern
23
f
. When the cross-polarization isolation between the probe
23
b
and the probe
23
c
is improved, an even better signal processing ability of the waveguide could be obtained.
It is therefore tried by the inventor to develop an improved circuit pattern to enhance the signal receiving ability of the waveguide.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide two printed probes on a circuit board of a waveguide, such that a sufficient cross-polarization isolation exists between the two probes for them to effectively receive electric waves from different directions without interfering with each other.
To achieve the above and other objects, the two printed probes of the present invention are printed on one side of the circuit board opposite to a cup-shaped tube portion of the waveguide at positions perpendicular to and spaced from each other by a predetermined distance. The two probes are separately located in two rectangular patterns that are provided outside a round pattern on the circuit board. The two rectangular patterns are separately located at a lower or an upper side and to a lateral side of the round pattern and both have a feed opening provided at an edge adjacent to the round pattern. Thus, it is possible to obtain a good cross-polarization isolation between the two probes for them to effectively receive electric waves in different directions without interfering with each other.
REFERENCES:
patent: 5440279 (1995-08-01), Kinoshita et al.
patent: 5737698 (1998-04-01), Gabrelian et al.
patent: 6041219 (2000-03-01), Peterson
patent: 6043789 (2000-03-01), Suzuki et al.
Nguyen Linh Van
Prime Electronics & Statellitcs Inc.
Tokar Michael J.
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