Importance

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Abstract

An integrated antenna includes a dielectric on which is patterned an antenna element and on which, close to an edge of the dielectric, is also patterned a conductive ground coupling member. The ground coupling member is capable of electricalcoupling with a grounded body surrounding the dielectric to provide a ground for an unbalanced transmission line whose live is connected to the antenna element. The length of the ground coupling member is made such that an integral odd number of quarterwavelengths of signals at each operating frequency are adapted to extend either side of a signal-ground connection point; the length approximates one-half wavelength at the primary operating frequency. By including a second signal feedline to extend in parallel with the ground coupling member and connect with another antenna element, it is possible for the integrated antenna to receive/transmit on at least two frequencies. The invention finds application in integrated antenna structures in which a local ground connection is not readily possible. For instance, the dielectric and grounded body may be a respective window and chassis of a car. Another automotive application involves forming the integrated antenna on a plastic boot lid.

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First Claim