LOW-PASS NON-REACTIVE FREQUENCY SELECTIVE FILTER IN WHICH HIGH FREQUENCIES ARE ABSORBED IN DISSIPATIVE MATERIAL
First Claim
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1. AN ELECTROMAGNETIC WAVE FREQUENCY FILTER SYSTEM COMPRISING:
- (A) COAXIAL MICROWAVE TRANSMISSION LINE MEANS PROVIDING A SOURCE OF ELECTROMAGNETIC WAVE ENERGY OF MIXED FREQUENCIES ABOVE AND BELOW A PREDETERMINED FREQUENCY LIMIT;
(B) AN INPUT COUPLER INCLUDING A TAPERED TRANSITION SECTION;
(C) WAVE FILTER MEANS CONNECTED TO SAID SOURCE OF ELECTROMAGNETIC WAVE ENERGY BY SAID INPUT COUPLER FOR FILTERING WAVES OF FREQUENCY ABOVE SAID PREDETERMINED FREQUENCY LIMIT FROM SAID WAVE ENERGY WHILE TRANSMITTING WAVES OF FREQUENCIES BELOW SAID PREDETERMINED FREQUENCY LIMIT, SAID TAPERED TRANSITION SECTION BEING CONNECTED DIRECTLY THERETO, SAID FILTER MEANS INCLUDING;
(1) A PERIODIC WAVE TRANSMISSION MEANS HAVING A PITCH SUBSTANTIALLY EQUAL TO TWICE THE LENGTH OF A WAVELENGTH CORRESPONDING TO THE UPPER FREQUENCY LIMIT SO THAT SAID TRANSMISSION MEANS IS AT LEAST PARTLY OPEN AND ELECTROMAGNETIC WAVES BELOW SAID PREDETERMINED FREQUENCY LIMIT PROPAGATE ALONG SAID TRANSMISSION MEANS THE ELECTROMAGNETIC WAVES ABOVE SAID PREDETERMINED LIMIT ARE RADIATED FROM SAID TRANSMISSION MEANS, SAID PERIODIC MEANS BEING A HELIX AND (2) A CYLINDRICAL ELECTROMAGNETIC WAVE ENERGY ABSORPTIVE STRUCTURE SURROUNDING SAIDD HELIX AND POSITIONED IN SPACED RELATION THERETO FOR INSERTING AND ABSORBING THE ELECTROMAGNETIC WAVE ENERGY RADIATED FROM SAID TRANSMISSION STRUCTURE, AND (D) AN OUTPUT COUPLER INCLUDING A TAPERED TRANSITION SECTION CONNECTED TO SAID HELIX, (E) MEANS CONNECTED TO SAID OUTPUT COUPLER FOR RECEIVING THE ELECTROMAGNETIC WAVES PROPAGATED ALONG SAID PERIODIC WAVE TRANSMISSION MEANS.
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1 Claim
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1. AN ELECTROMAGNETIC WAVE FREQUENCY FILTER SYSTEM COMPRISING:
- (A) COAXIAL MICROWAVE TRANSMISSION LINE MEANS PROVIDING A SOURCE OF ELECTROMAGNETIC WAVE ENERGY OF MIXED FREQUENCIES ABOVE AND BELOW A PREDETERMINED FREQUENCY LIMIT;
(B) AN INPUT COUPLER INCLUDING A TAPERED TRANSITION SECTION;
(C) WAVE FILTER MEANS CONNECTED TO SAID SOURCE OF ELECTROMAGNETIC WAVE ENERGY BY SAID INPUT COUPLER FOR FILTERING WAVES OF FREQUENCY ABOVE SAID PREDETERMINED FREQUENCY LIMIT FROM SAID WAVE ENERGY WHILE TRANSMITTING WAVES OF FREQUENCIES BELOW SAID PREDETERMINED FREQUENCY LIMIT, SAID TAPERED TRANSITION SECTION BEING CONNECTED DIRECTLY THERETO, SAID FILTER MEANS INCLUDING;
(1) A PERIODIC WAVE TRANSMISSION MEANS HAVING A PITCH SUBSTANTIALLY EQUAL TO TWICE THE LENGTH OF A WAVELENGTH CORRESPONDING TO THE UPPER FREQUENCY LIMIT SO THAT SAID TRANSMISSION MEANS IS AT LEAST PARTLY OPEN AND ELECTROMAGNETIC WAVES BELOW SAID PREDETERMINED FREQUENCY LIMIT PROPAGATE ALONG SAID TRANSMISSION MEANS THE ELECTROMAGNETIC WAVES ABOVE SAID PREDETERMINED LIMIT ARE RADIATED FROM SAID TRANSMISSION MEANS, SAID PERIODIC MEANS BEING A HELIX AND (2) A CYLINDRICAL ELECTROMAGNETIC WAVE ENERGY ABSORPTIVE STRUCTURE SURROUNDING SAIDD HELIX AND POSITIONED IN SPACED RELATION THERETO FOR INSERTING AND ABSORBING THE ELECTROMAGNETIC WAVE ENERGY RADIATED FROM SAID TRANSMISSION STRUCTURE, AND (D) AN OUTPUT COUPLER INCLUDING A TAPERED TRANSITION SECTION CONNECTED TO SAID HELIX, (E) MEANS CONNECTED TO SAID OUTPUT COUPLER FOR RECEIVING THE ELECTROMAGNETIC WAVES PROPAGATED ALONG SAID PERIODIC WAVE TRANSMISSION MEANS.
- (A) COAXIAL MICROWAVE TRANSMISSION LINE MEANS PROVIDING A SOURCE OF ELECTROMAGNETIC WAVE ENERGY OF MIXED FREQUENCIES ABOVE AND BELOW A PREDETERMINED FREQUENCY LIMIT;
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Current AssigneeCharles K. Birdsall, Richard M. White
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Original AssigneeCharles K. Birdsall, Richard M. White
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InventorsBirdsall, Charles K., White, Richard M.
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Application NumberUS04/326,142Time in Patent Office1,904 DaysField of SearchUS Class Current333/206CPC Class CodesH01P 1/202 Coaxial filters cascaded co...
