| US 7,468,641 B2 | ||
| Microwave bandstop filter for an output multiplexer | ||
| Mario Sorolla, Castello (Spain); Dietmar Schmitt, Wassenaar (Netherlands); Marco Guglielmi, Wassenaar (Netherlands); Javier Gil, Pamplona (Spain); and Noelia Ortiz Perez De Eulate, Alsasua (Spain) | ||
| Assigned to Agence Spatiale Europeenne, Paris (France) | ||
| Filed on Jul. 26, 2006, as Appl. No. 11/492,883. | ||
| Claims priority of application No. 05 08005 (FR), filed on Jul. 27, 2005. | ||
| Prior Publication US 2007/0024394 A1, Feb. 01, 2007 | ||
| Int. Cl. H01P 1/00 (2006.01); H01P 5/12 (2006.01); H01P 9/00 (2006.01) | ||
| U.S. Cl. 333—135 [333/122; 333/157; 333/208; 333/248] | 16 Claims |
| 1. A microwave bandstop filter comprising a waveguide segment of cross-section that presents longitudinal variation of the sinusoidal type that is modulated by an amplitude function that is continuous, a period of said longitudinal variation of sinusoidal type being the Bragg period for a fundamental guided mode at a center frequency of a band to be stopped, wherein a maximum longitudinal variation in the cross-section of the waveguide lies in the range 30% to 70% of the mean gap of the waveguide segment. |