Claims
- 1. A flat cavity RF power divider for coupling RF energy applied thereto, said power divider comprising:
- a flat cavity structure having first and second spaced apart parallel cavity broadwalls, and upper, lower, left and right narrow end walls joining said cavity broadwalls at edges thereof to enclose a flat cavity;
- an input rectangular waveguide structure having first and second spaced apart waveguide broadwalls and sidewalls joined at edges thereof, an input port disposed at one end of said waveguide structure, said waveguide structure having a longitudinal centerline, a portion of one of said waveguide broadwalls being shared with a portion of one of said cavity broadwalls to constitute a common broadwall portion, and said longitudinal centerline of said waveguide structure being generally parallel to and centrally aligned between said upper and lower end walls of said flat cavity structure;
- a plurality of longitudinal shunt slots disposed through said common broadwall portion for coupling the applied RF energy between said waveguide structure and said cavity structure, said longitudinal shunt slots being disposed along a longitudinal slot centerline parallel to and offset from said waveguide structure longitudinal centerline;
- curved waveguide short circuit means disposed in said waveguide structure for creating a relatively high standing-wave in response to the RF energy applied thereto along said waveguide structure and for providing a maximum E-field to excite each of said slots thereby exciting an transverse axis column of said flat cavity structure;
- a plurality of output ports disposed in the other broadwall of said cavity structure, each of said output ports having a respective probe penetrating into the flat cavity structure to couple out the RF energy; and
- whereby the RF energy applied to said waveguide structure is coupled through said slots and probes and divided among said output ports.
- 2. The flat cavity RF power divider according to claim 1 further comprising RF absorbing material disposed in said flat cavity structure along said upper and lower walls thereof to surpress undesired modes and to provide for improved frequency response of said power divider.
- 3. The flat cavity RF power divider according to claim 2 wherein said input waveguide structure is a WR-62 waveguide.
- 4. The flat cavity RF power divider according to claim 3 wherein said plurality of output ports comprises 16 output ports having corresponding SMA output coupling probes extending into said flat cavity structure and said coupling probes are spaced about 1.5 .lambda.g apart, where .lambda.g is the input waveguide wavelength of the applied RF energy.
- 5. The flat cavity RF power divider according to claim 3 wherein said curved waveguide short circuit means is spaced from a slot closest thereto by a distance of .lambda.g/4 where .lambda.g is the input waveguide wavelength of the applied RF energy.
- 6. The flat cavity RF power divider according to claim 3 wherein said plurality of longitudinal shunt slots comprises four slots spaced at multiples one quarter of the input waveguide wavelength of the applied RF energy.
- 7. The flat cavity RF power divider according to claim 6 wherein said output coupling probes extend into said flat cavity a length of .lambda..sub.0 /4, where .lambda..sub.0 is the free-space wavelength of the applied RF energy.
- 8. The flat cavity RF power divider according to claim 1 wherein said input waveguide structure comprises an elongated feed section orthongonally joining an elongated horizontal feed section at a waveguide tee junction disposed at a central portion of said elongated horizontal feed section to provide symmetrical excitation of the slots, said input port being disposed at an outer end of said elongated horizontal feed section.
- 9. The flat cavity RF power divider according to claim 8 wherein said plurality output comprises 16 output ports having corresponding SMA output coupling probes extending into said flat cavity structure and said coupling probes are spaced about 1.5 .lambda.g apart, where .lambda.g is the input waveguide wavelength of the applied RF energy.
- 10. The flat cavity RF power divider according to claim 9 wherein said output coupling probes extend into said flat cavity a depth of .lambda..sub.0 /4, where .lambda..sub.0 is the free space wavelength of the applied RF energy.
- 11. The flat cavity RF power divider according to claim 8 wherein said elongated horizontal feed section comprises two halves and opposite ends, and wherein said plurality of longitudinal shunt slots comprises four slots, two of which are disposed in each half of said elongated horizontal feed section.
- 12. The flat cavity RF power divider according to claim 11 wherein said curved waveguide short circuit means includes curved waveguide short circuit element means disposed at said opposite ends of said elongated horizontal feed section for reflecting energy incident thereon back to excite corresponding two of said longitudinal shunt slots.
Parent Case Info
This is a continuation of application Ser. No. 07/695,845, filed May 6, 1991, now abandoned.
Government Interests
This invention was made with Government support under Contract No. F19628-89-C-0060 awarded by the Department of the Air Force. The Government has certain rights in this invention.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
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835913 |
Apr 1952 |
DEX |
1443033 |
Jul 1976 |
GBX |
Continuations (1)
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695845 |
May 1991 |
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