Small broadband loop antenna for near field applications
First Claim
Patent Images
1. A broadband antenna, comprising:
- a conductive layer;
a ground layer;
an insulating layer positioned between the conductive layer and the ground layer;
a shorting via, the shorting via passing through the insulating layer and electrically connecting the conductive layer to the ground layer;
a first loop, the first loop having a first port and a second port, the first loop connected at the first port to a matching circuit and connected at the second port to the shorting via, the first loop including a first circuit element, the first loop being tunable by adjusting at least one of the first circuit element, a shape of the first loop, a shape of the conductive layer, the matching circuit and a position of the shorting via;
a second loop, having a third port and a fourth port, the second loop connected at the third port to the matching circuit and connected at the fourth port to the shorting via, the second loop including a second circuit element, the second loop being tunable by adjusting at least one of the second circuit element, a shape of the second loop, a shape of the conductive layer, the matching circuit and the position of the shorting via; and
at least a portion of the first loop and the second loop being separated by the insulating layer.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for providing a broadband near field of an antenna are disclosed. A small broadband loop antenna may include a printed circuit board (PCB) substrate with multiple layers. Printed on the PCB substrate are dual loops sharing a same driver circuit, an impedance matching network, a primary ground layer and a conductive layer. A shorting via connects the dual loops to a ground plane. The antenna may be tuned to a desired operating frequency by adjusting parameters of the loop, such as the position of the shorting via.
-
Citations
15 Claims
-
1. A broadband antenna, comprising:
-
a conductive layer; a ground layer; an insulating layer positioned between the conductive layer and the ground layer; a shorting via, the shorting via passing through the insulating layer and electrically connecting the conductive layer to the ground layer; a first loop, the first loop having a first port and a second port, the first loop connected at the first port to a matching circuit and connected at the second port to the shorting via, the first loop including a first circuit element, the first loop being tunable by adjusting at least one of the first circuit element, a shape of the first loop, a shape of the conductive layer, the matching circuit and a position of the shorting via; a second loop, having a third port and a fourth port, the second loop connected at the third port to the matching circuit and connected at the fourth port to the shorting via, the second loop including a second circuit element, the second loop being tunable by adjusting at least one of the second circuit element, a shape of the second loop, a shape of the conductive layer, the matching circuit and the position of the shorting via; and at least a portion of the first loop and the second loop being separated by the insulating layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for producing an electromagnetic near field using an antenna, the antenna comprising a first loop, a second loop, a matching circuit, a ground plane, a conducting layer, an insulating layer between the ground plane and the conducting layer and a shorting via passing through the insulating layer and electrically connecting the conductive layer to the ground layer, the first and second loops each having a first port and a second port, the first and second loops connected to the matching circuit at the first ports of the first and second loops and connected to the shorting via at the second ports of the first and second loops, at least one of the first and second loops including a lumped passive circuit element, the method comprising:
-
tuning the antenna to cause the first loop to radiate with substantial gain in a near field over a first frequency band between a first frequency and a second frequency; and tuning the antenna to cause the second loop to radiate with substantial gain in the near field over a second frequency band between the second frequency and a third frequency. - View Dependent Claims (11, 12, 13, 14)
-
-
15. An antenna, comprising:
-
a conductive layer; a ground layer; a first insulating layer; a second insulating layer, at least part of the first insulating layer and the second insulating layer being positioned between the conductive layer and the ground layer a matching circuit, the matching circuit being arranged to provide substantial matching of an impedance of a driver circuit to an impedance of the antenna; a shorting via, the shorting via connecting the conductive layer to the ground layer, the conductive layer positioned on the first insulating layer and the ground layer positioned on the second insulating layer, the shorting via passing through the first insulating layer and the second insulating layer; a first radiating element having a first port and a second port, the first radiating element connected to the matching circuit at the first port and connected to the shorting via at the second port, the first radiating element being positioned on a same side of the first insulating layer as the conductive layer; and a second radiating element having a third port and a fourth port, the second radiating element connected to the matching circuit at the third port and connected to the shorting via at the fourth port, the second radiating element being positioned between the first insulating layer and the second insulating layer.
-
Specification