High efficiency microstrip antennas

H - Electricity – 01 – Q

Patent

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H01Q 1/38 (2006.01) H01Q 9/04 (2006.01)

Patent

CA 2160284

The effectiveness of a microstrip conductor antenna, such as a patch antenna, is improved at any particular frequency by making the thickness of the conductor sufficiently small to reduce shielding and losses caused by the skin effect and make currents at the upper and lower surfaces couple with each other and make the conductor partially transparent to radiation. In one embodiment the thickness is between 0.5? and 4?. Preferably the thickness is between 1? and 2? where ? is equal to the distance at which current is reduced by 1/e., for example 1.5 to 3 micrometers at 2.5 gigahertz in copper. According to an embodiment, alternate layers of dielectrics and radiation transparent patches on a substrate enhance antenna operation.

Le rendement d'une antenne microruban, comme une antenne à plaque, est amélioré en amincissant suffisamment l'épaisseur du conducteur pour réduire le blindage et les pertes causés par l'effet pelliculaire et pour obtenir que les courants circulant dans les surfaces supérieure et inférieure soient couplés mutuellement et rendent le conducteur partiellement transparent aux rayonnements. Dans une réalisation, l'épaisseur se situe entre 0,5? et 4?. De préférence, l'épaisseur sera entre 1? et 2?, où ? est égal à la distance à laquelle le courant est réduit d'un facteur de 1/e : par exemple, 1,5 à 3 micromètres à 2,5 gigahertz en cuivre. Dans une autre réalisation, des couches alternées de diélectriques et de plaques transparentes aux rayonnements montées sur un substrat améliorent le fonctionnement d'une antenne.

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