U.S. patent number 3,579,149 [Application Number 04/883,014] was granted by the patent office on 1971-05-18 for waveguide to stripline transition means.
This patent grant is currently assigned to Westinghouse Electric Corporation. Invention is credited to Kurt G. Ramsey.
United States Patent |
3,579,149 |
Ramsey |
May 18, 1971 |
WAVEGUIDE TO STRIPLINE TRANSITION MEANS
Abstract
Described is apparatus for translating electromagnetic wave
energy traveling in the TE.sub.10 mode in a rectangular waveguide
to the TEM mode in a stripline transmission line or vice versa.
This is accomplished by means of an E-plane folded tee connection
having an input port connected to a waveguide and a stripline
transmission line connected to a double output port of the folded
tee.
Inventors: |
Ramsey; Kurt G. (Baltimore,
MD) |
Assignee: |
Westinghouse Electric
Corporation (Pittsburgh, PA)
|
Family
ID: |
25381811 |
Appl.
No.: |
04/883,014 |
Filed: |
December 8, 1969 |
Current U.S.
Class: |
333/26;
333/21R |
Current CPC
Class: |
H01P
5/107 (20130101) |
Current International
Class: |
H01P
5/10 (20060101); H01P 5/107 (20060101); H01p
005/12 (); H01p 001/16 () |
Field of
Search: |
;333/21,11,84 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Saalbach; Herman Karl
Assistant Examiner: Nussbaum; Marvin
Claims
I claim:
1. Apparatus for coupling electromagnetic energy from a rectangular
waveguide to a stripline transmission line comprising a folded tee
junction having an input port connected to a waveguide, a pair of
parallel superimposed output ports disposed at right angles to said
input port and separated by a wall between the two, the wave energy
in the respective output ports being 180.degree. out of phase with
respect to each other, a stripline transmission line comprising an
inner conductor sandwiched between the dielectric slabs and having
an outer layer of electrical conducting material on either side of
said inner conductor, means connecting said outer layers of said
stripline transmission line to the wall of said tee junction, said
inner conductor of the stripline transmission line lying in
essentially the same plane as the wall between said parallel output
ports, and a load impedance disposed on the side of said input port
of the folded tee junction opposite said parallel output ports.
2. The apparatus of claim 1 wherein wave energy in said rectangular
waveguide is propagated in the TE.sub.10 mode.
3. The apparatus of claim 1 wherein said wall separating said
parallel output ports is grounded.
4. The apparatus of claim 1 wherein said inner conductor of the
stripline transition line has a width adjacent said wall between
the output ports substantially equal to that of the wall but tapers
down to a width less than that of the wall.
5. The apparatus of claim 1 wherein wave energy is propagated
through said stripline transition line in the TEM mode.
Description
BACKGROUND OF THE INVENTION
As is known, stripline wave energy transmission lines have become
increasingly important in cases where low power wave energy is to
be transmitted at a savings in weight and volume over a
conventional waveguide system. The stripline, similar in operation
to a coaxial transmission line, comprises a center conductor
sandwiched between dielectric slabs covered with conducting
material forming a ground plane. In certain cases, it becomes
necessary to couple a waveguide to a stripline transmission line or
vice versa. This may be accomplished by means of a probe connected
to the center conductor of the stripline transmission line and
extending into the waveguide. In certain cases, however, this
arrangement is not altogether satisfactory.
SUMMARY OF THE INVENTION
As an overall object, the present invention seeks to provide a new
and improved system for connecting a waveguide to a stripline
transmission line.
More specifically, an object of the invention is to provide a
waveguide to stripline transition for converting wave energy in the
TE.sub.10 mode to the TEM mode or vice versa, wherein the coupling
element between the two comprises a folded tee connection.
In accordance with the invention, a apparatus for coupling
electromagnetic wave energy from a rectangular waveguide to a
stripline transmission line or vice versa is provided comprising a
folded tee junction having an input port connected to a waveguide
conveying wave energy in the TE.sub.10 mode and a pair of parallel
superimposed output ports disposed at right angles to the input
port and separated by a wall between the pair. The waves in the
respective output ports are 180.degree. out of phase with respect
to each other. A stripline wave energy transmission line is coupled
to the parallel output ports and includes an inner conductor
sandwiched between dielectric slabs and having outer layers of
electrical conducting material on either side of the inner
conductor. By connecting the outer conductive material of the
stripline transmission line to the wall of the folded tee junction,
and by connecting the inner conductor of the stripline transmission
line to the common wall between the parallel waveguide output
ports, the complete transition from waveguide to stripline is
effected. Preferably a matched load is disposed on the side of the
input port of the folded tee opposite the parallel output
ports.
The above and other objects and features of the invention will
become apparent from the following detailed description taken in
connection with the accompanying drawings which form a part of this
specification, and in which:
FIG. 1 is a perspective view of the transition means of the
invention; and
FIG. 2 is a broken-away perspective view of the transition means of
FIG. 1 taken substantially along line II-II of FIG. 1.
With reference now to the drawings, the embodiment of the invention
shown includes an input port 10 adapted for connection to a
rectangular waveguide conveying wave energy in the TE.sub.10 mode,
meaning that all of the electric vectors are perpendicular to the
long transverse dimension of the waveguide and that a half wave
pattern of the electric field exists along the short dimension of
the guide through the center of the cross section. The port 10
comprises part of a folded tee junction 12 having an input opening
14 communicating with the port 10 and a pair of output ports 16 and
18 separated by a common wall 20 which, like the side walls of the
coupler 12, is grounded. Disposed on the side of the input opening
14 opposite the output ports 16 and 18 is a short waveguide section
22 which carries a matched terminating load impedance 24. The wave
energy patterns, as they appear in the two openings 16 and 18, are
180.degree. out of phase with respect to each other.
At the side of the wall 20 opposite the opening 14 is an opening 26
which receives the end of a stripline electromagnetic wave
transmission line 28. As shown, the transmission line 28 comprises
a center conductor 30 which is connected to the wall 20 separating
the two output ports 16 and 18. The center conductor 30 is
sandwiched between dielectric slabs 32 and 24 which may, for
example, be formed from Teflon (trademark) or the like. As best
shown in FIG. 1, the center conductor 30 is provided with a
relatively wide tongue 30A which tapers down to a much narrower
section 30B. The Teflon slabs 32 and 34 are encases by means of a
metallic casing 36 which may comprise a cladding or be formed by
vapor deposition techniques.
With the arrangement shown, the wave energy patterns on either side
of the wall 20, being 180.degree. out of phase with respect to each
other, will be coupled to the center conductor 30 where the wave
energy now travels along the stripline conductor in the TEM mode,
in much the same manner as wave energy traveling along a coaxial
line. Conversely, wave energy in the TEM mode fed into the folded
tee 12 will appear at port 10 in the TE.sub.10 mode.
The present invention thus provides a new and improved means for
coupling a rectangular waveguide to a stripline transmission line
or vice versa. Although the invention has been shown in connection
with a certain specific embodiment, it will be readily apparent to
those skilled in the art that various changes in form and
arrangement of parts may be made to suit requirements without
departing from the spirit and scope of the invention.
* * * * *