Tunable multiband antenna with passive and active circuitry
First Claim
1. An antenna, comprising:
- a resonating element having a first arm and a second arm, wherein the second arm has first, second, and third portions, the first portion extends parallel to the second portion, and the third portion extends from an end of the first portion to an end of the second portion;
an antenna ground, wherein the second arm and the antenna ground are configured to resonate in a low communications band and the first arm and the antenna ground are configured to resonate in a high communications band;
a first antenna feed terminal coupled to the resonating element;
a second antenna feed terminal coupled to the antenna ground;
a short circuit path coupled between the resonating element and the antenna ground; and
a filter coupled between the first portion and the second portion of the second arm, wherein the filter is configured to form a path length between the first and second portions of the second arm that is shorter than the second arm.
0 Assignments
0 Petitions
Accused Products
Abstract
An electronic device may have an antenna for providing coverage in wireless communications bands of interest such as a low frequency communications band and a high frequency communications band. The antenna may have an antenna ground and an antenna resonating element. The antenna resonating element may have a high band arm that contributes to a first high band resonance in the high band and may have a low band arm that exhibits a low band resonance in the low band. A passive filter that is coupled between first and second portions of the antenna resonating element may be configured to exhibit a short circuit impedance associated with a bypass path that allows the antenna resonating element to contribute to a second high band resonance in the high band. A tunable inductor coupled to the antenna resonating element may be used to tune the low band resonance.
-
Citations
20 Claims
-
1. An antenna, comprising:
-
a resonating element having a first arm and a second arm, wherein the second arm has first, second, and third portions, the first portion extends parallel to the second portion, and the third portion extends from an end of the first portion to an end of the second portion; an antenna ground, wherein the second arm and the antenna ground are configured to resonate in a low communications band and the first arm and the antenna ground are configured to resonate in a high communications band; a first antenna feed terminal coupled to the resonating element; a second antenna feed terminal coupled to the antenna ground; a short circuit path coupled between the resonating element and the antenna ground; and a filter coupled between the first portion and the second portion of the second arm, wherein the filter is configured to form a path length between the first and second portions of the second arm that is shorter than the second arm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An electronic device, comprising:
-
a housing; an antenna ground; a dielectric carrier; an antenna resonating element formed on the dielectric carrier, wherein the antenna resonating element has a first arm and a second arm, the first arm and the antenna ground are configured to exhibit a low band antenna resonance, and the second arm and the antenna ground are configured to exhibit a high band antenna resonance; a short circuit path coupled between the antenna resonating element and the antenna ground; a first antenna feed terminal coupled to the antenna resonating element; a second antenna feed terminal coupled to the antenna ground; and a filter coupled between a first portion of the first arm and a second portion of the first arm, wherein the first portion of the first arm extends parallel to the second portion of the first arm, the first and second portions of the first arm are coupled together by a third portion of the first arm that extends between the first and second portions, and the filter is configured to form a path length that is shorter than the first arm. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. An antenna comprising:
-
an antenna ground; an antenna resonating element having a first arm and a second arm, wherein the antenna ground and the first arm are configured to resonate in a low frequency band, the antenna ground and the second arm are configured to resonate in a first high frequency band; an antenna feed having a first feed terminal coupled to the antenna ground and a second feed terminal coupled to the antenna resonating element; a short circuit path coupled between the antenna ground and the antenna resonating element; and a filter coupled between a first portion of the first arm and a second portion of the first arm, wherein the filter forms a short circuit that creates a path length that is shorter than the first arm at frequencies in a second high frequency band and forms an open circuit for at least some frequencies other than the frequencies in the second high frequency band. - View Dependent Claims (19, 20)
-
Specification