Wideband TM.sub.01 -to-TE.sub.11 circular waveguide mode convertor
AssigneeHughes Aircraft Company
InventorRobert L. Eisenhart
Life of this patent
Estimating the term…
Abstract
The mode convertor employs two intermediate modes, a coaxial TEM and a rectangular waveguide TE.sub.10 mode, in the transition between the TM.sub.01 and TE.sub.11 circular waveguide modes. The coaxial line provides isolation while acting as a mode filter between the device input and output ports. The rectangular waveguide provides a wide mode separation ratio between the TE.sub.10 and TM.sub.11 modes. The TE.sub.10 mode then transitions into the TE.sub.11 in the circular output waveguide. The coaxial section keeps the output TE.sub.11 mode from scattering back to the input, and the rectangular section keeps the TM.sub.01 from being excited in the output.
Claims29
A mode convertor for converting between the circular waveguide TM.sub.01 mode and the rectangular waveguide TE.sub.10 mode, comprising:
- an input port receiving electromagnetic energy having a circular waveguide TM.sub.01 mode energy component;
- first converting means communicating with said input port for converting said TM.sub.01 energy component to a coaxial TEM mode energy component;
- and
- second converting means communicating with said first converting means for converting said coaxial TEM mode energy component into a rectangular waveguide TE.sub.10 mode energy component.
Apparatus for converting between the circular waveguide TM.sub.01 and TE.sub.11 modes, comprising:
- an input port receiving electromagnetic radiation having a circular waveguide TM.sub.01 mode energy component;
- first converting means communicating with said input port for converting said TM.sub.01 energy component to a coaxial TEM mode energy component;
- second converting means communicating with said first converting means for converting said coaxial TEM mode energy component into a rectangular waveguide TE.sub.10 mode energy component;
- and
- third converting means communicating with said second converting means for converting said rectangular waveguide TE.sub.10 mode energy component into said circular waveguide TE.sub.11 mode.
A system for radiating electromagnetic energy, comprising:
- a source of electromagnetic energy providing circular waveguide TM.sub.01 mode signals;
- a radiating element for radiating electromagnetic energy in response to rectangular waveguide TE.sub.10 mode excitation signals;
- and
- a mode convertor coupling said energy source to said radiating element and for converting said circular waveguide TM.sub.01 mode signals to said rectangular waveguide TE.sub.10 mode signals, said mode convertor comprising:
- an input port receiving said circular waveguide TM.sub.01 signals;
- first converting means communicating with said input port for converting said TM.sub.01 mode signals into coaxial TEM mode signals;
- and
- second converting means communicating with said first converting means for converting said coaxial TEM mode signals into said rectangular waveguide TE.sub.10 mode signals.
A system for radiating electromagnetic energy, comprising:
- a source of electromagnetic energy providing circular waveguide TM.sub.01 mode signals;
- a radiating element for radiating electromagnetic energy in response to circular waveguide TE.sub.11 mode excitation signals;
- and
- a mode convertor coupling said energy source to said radiating element and for converting said circular waveguide TM.sub.01 mode signals to circular waveguide TE.sub.11 mode signals, said convertor comprising:
- an input port receiving said circular waveguide TM.sub.01 signals;
- first converting means communicating with said input port for converting said TM.sub.01 mode signals into coaxial TEM mode signals;
- second converting means communicating with said first converting means for converting said coaxial TEM mode signals into rectangular waveguide TE.sub.10 mode signals;
- and
- third converting means communicating with said second converting means for converting said rectangular waveguide TE.sub.10 mode signals into said circular waveguide TE.sub.11 mode signals.
Dependencies are inferred from the claim text.