Multi-band bent monopole antenna
First Claim
1. A method for increasing a bandwidth of a multi-band antenna comprising:
- capacitively coupling a main antenna element to a parasitic element disposed proximate the main antenna element when the multi-band antenna operates in a first frequency band to increase a bandwidth of the first frequency band;
disabling the capacitive coupling when the multi-band antenna operates in the second frequency band; and
disposing a filter between the parasitic element and the ground of the main antenna element, wherein the filter has a low impedance responsive to frequencies in the first frequency band so as to capacitively couple the main antenna element to the parasitic element when the multi-band antenna operates in the first frequency band, and wherein the filter has a high impedance responsive to frequencies in the second frequency band so as to disable the capacitive coupling between the main antenna element and the parasitic element when the multi-band antenna operates in the second frequency band.
8 Assignments
0 Petitions
Accused Products
Abstract
The method and apparatus described herein improves the bandwidth of a selected frequency band of a multi-band antenna. In particular, a selection circuit selectively applies capacitive coupling to the multi-band antenna to improve the bandwidth of a first frequency band without adversely affecting the bandwidth of a second frequency band. To that end, the multi-band antenna of the present invention comprises a main antenna element and a parasitic element disposed proximate the main antenna element. When the multi-band antenna operates in the first frequency band, the main antenna element capacitively couples to the parasitic element. However, when the multi-band antenna operates in the second frequency band, the selection circuit disables the capacitive coupling. By applying the capacitive coupling only when the multi-band antenna operates in the first frequency band, the present invention increases the bandwidth of the first frequency band without adversely affecting the bandwidth of the second frequency band.
37 Citations
24 Claims
-
1. A method for increasing a bandwidth of a multi-band antenna comprising:
-
capacitively coupling a main antenna element to a parasitic element disposed proximate the main antenna element when the multi-band antenna operates in a first frequency band to increase a bandwidth of the first frequency band; disabling the capacitive coupling when the multi-band antenna operates in the second frequency band; and disposing a filter between the parasitic element and the ground of the main antenna element, wherein the filter has a low impedance responsive to frequencies in the first frequency band so as to capacitively couple the main antenna element to the parasitic element when the multi-band antenna operates in the first frequency band, and wherein the filter has a high impedance responsive to frequencies in the second frequency band so as to disable the capacitive coupling between the main antenna element and the parasitic element when the multi-band antenna operates in the second frequency band. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A multi-band antenna for a wireless communication device comprising:
-
a main antenna element; a parasitic element disposed proximate a portion of the main antenna element; and a filter operatively connected between the parasitic element and a ground of the main antenna element, wherein the filter is configured to enable capacitive coupling between the main antenna element and the parasitic element when the multi-band antenna operates in a first frequency band to increase a bandwidth of the first frequency band, and configured to disable the capacitive coupling when the multi-band antenna operates in a second frequency band. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A wireless communication device comprising:
-
a transceiver configured to transmit and receive wireless signals over a wireless network; multi-band antenna operatively connected to the transceiver comprising; a main antenna element; a parasitic element disposed proximate a portion of the main antenna element; and a filter operatively connected between the parasitic element and a ground of the main antenna element, wherein the filter is configured to enable capacitive coupling between the main antenna element and the parasitic element when the multi-band antenna operates in a first frequency band to increase a bandwidth of the first frequency band, and configured to disable the capacitive coupling when the multi-band antenna operates in a second frequency band. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
Specification