An antenna
Номер патента: MY123075A
Опубликовано: 31-05-2006
Автор(ы): Oliver Paul Leisten
Принадлежит: Sarantel Ltd
Опубликовано: 31-05-2006
Автор(ы): Oliver Paul Leisten
Принадлежит: Sarantel Ltd
Реферат: A MINIATURE ANTENNA (10) FOR OPERATION AT FREQUENCIES IN EXCESS OF 200 MHZ HAS A CERAMIC CORE (12) IN THE FORM OF A CYLINDRICAL ROD HAVING A RELATIVE DIELECTRIC CONSTANT GREATER THAN 5. PLATED ON THE OUTER SURFACES OF THE CORE (12) IS AN ANTENNA ELEMENT STRUCTURE COMPRISING A SINGLE PAIR OF OPPOSITELY DISPOSED HELICAL ELEMENTS (L0A, L0B) HAVING A COMMON CENTRAL AXIS COINCIDENT WITH THE CENTRAL AXIS (12A) OF THE CORE. AT A DISTAL END OF THE ANTENNA, THEY ARE CONNECTED TO A COAXIAL FEEDER STRUCTURE (16 -18) PASSING AXIALLY THROUGH THE CORE (12), AND AT THEIR PROXIMAL ENDS THEY ARE CONNECTED TO THE RIM OF A CYLINDRICAL TRAP CONDUCTOR (20) WHICH, AT THE PROXIMAL END OF THE CORE IS COUPLED TO THE SCREEN (16) OF THE FEEDER STRUCTURE. AT THE OPERATING FREQUENCY, THE ANTENNA (10) BEHAVES AS A LOOP, THE RADIATION RESPONSE HAVING NULLS DIRECTED GENERALLY PERPENDICULARLY ON EACH SIDE OF A PLANE (24) CONTAINING THE CENTRAL AXIS (12A) OF THE CORE AND THE CONNECTIONS OF THE HELICAL ELEMENTS WITH THE FEEDER STRUCTURE AND WITH THE CONDUCTIVE SLEEVE (20). THE ANTENNA (10) IS INTENDED PRIMARILY FOR A HANDHELD COMMUNICATION UNIT (30) SUCH AS A CELLULAR OR CORDLESS TELEPHONE HANDSET, THE PRESENCE OF THE NULLS IN THE RADIATION PATTERN REDUCING RADIATION INTO THE USER'S HEAD.
An antenna
Номер патента: GB2292638B. Автор: Oliver Paul Leisten. Владелец: Symmetricom Inc. Дата публикации: 1999-02-24.