Multiband slot loop antenna apparatus and methods
First Claim
1. A multiband antenna apparatus for use in a portable radio communications device, the antenna apparatus comprising:
- a first antenna structure comprising an element configured to be disposed around an external surface of a device enclosure;
wherein;
the first antenna structure is connected to a ground plane of the device in at least two locations in order to form a virtual portion and an operational portion; and
the operational portion comprises a slot formed in the element so as to be disposed proximate a bottom side of the device enclosure, the slot further dividing the operational portion into a longer section and a shorter section; and
a plurality of tuning branches with at least one of the tuning branches coupled to a feed port of the portable radio communications device, the plurality of tuning branches collectively configured to effectuate a plurality of resonances within the longer section and the shorter section of the operational portion.
2 Assignments
0 Petitions
Accused Products
Abstract
A multiband slot loop antenna apparatus, and methods of tuning and utilizing the same. In one embodiment, the antenna configuration is used within a handheld mobile device (e.g., cellular telephone or smartphone). The antenna comprises two radiating structures: a ring or loop structure substantially enveloping an outside perimeter of the device enclosure, and a tuning structure disposed inside the enclosure. The ring structure is grounded to the ground plane of the device so as to create a virtual portion and an operating portion. The tuning structure is spaced from the ground plane, and includes a plurality of radiator branches effecting antenna operation in various frequency bands; e.g., at least one lower frequency band and three upper frequency bands. On one implementation, a second lower frequency band radiator is effected using a reactive matched circuit coupled between a device feed and a radiator branch.
-
Citations
29 Claims
-
1. A multiband antenna apparatus for use in a portable radio communications device, the antenna apparatus comprising:
-
a first antenna structure comprising an element configured to be disposed around an external surface of a device enclosure; wherein; the first antenna structure is connected to a ground plane of the device in at least two locations in order to form a virtual portion and an operational portion; and the operational portion comprises a slot formed in the element so as to be disposed proximate a bottom side of the device enclosure, the slot further dividing the operational portion into a longer section and a shorter section; and a plurality of tuning branches with at least one of the tuning branches coupled to a feed port of the portable radio communications device, the plurality of tuning branches collectively configured to effectuate a plurality of resonances within the longer section and the shorter section of the operational portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of operating a multiband antenna apparatus for use in a portable radio device, the apparatus having a feed, a loop radiator element disposed around a perimeter region and on an external surface of an enclosure of the device, the loop radiator element having a slot disposed substantially at a bottom edge of the enclosure, and a ground plane of the radio device disposed a distance away from a bottom edge of the loop radiator element, the method comprising;
-
energizing the feed with a feed signal comprising a lower frequency component and a higher frequency component; and causing radio frequency oscillations in the loop radiator element at least at the higher frequency via use of one or more tuning branches coupled to the feed, the one or more tuning branches disposed adjacent the loop radiator element; wherein, the slot is configured to effect tuning of the antenna apparatus at the higher frequency.
-
-
14. A mobile device, comprising:
-
a device enclosure; and an antenna comprising; an external radiator element, the external radiator element having at least one slot disposed relative to the device enclosure so as to minimize potential for the external radiator element shorting across the slot due to the device being handled by a user during use of the device; and a plurality of tuning branches with at least one of the tuning branches coupled to a feed of the mobile device, the plurality of tuning branches configured to effectuate a plurality of resonances within respective portions of the external radiator element. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
Specification