Abstract: An apparatus comprising: a first antenna having a first end coupled to a first port and a second end coupled to a second port, the first antenna extending between the first and second ends and having a mid-point substantially halfway between the first and second ends, the first antenna having a first electrical length and resonant in a first operational resonant frequency band; a second antenna extending from the first antenna at a position between one of the first and second ends and the mid-point of the first antenna, the second antenna having a second electrical length and resonant in a second operational resonant frequency band; and a third antenna extending from the first antenna at position between one of the first and second ends and the mid-point of the first antenna, the third antenna having a third electrical length and resonant in a third operational resonant frequency band.

Abstract: In accordance with one example embodiment of the present invention an apparatus is disclosed. The apparatus includes a cover, a ground plane, a first inductor, and a second inductor. The cover includes a first end and an opposite second end. The cover is configured to operate as a first loop radiator portion. The ground plane is proximate the cover. The ground plane is configured to operate as a second loop radiator portion. The first inductor is proximate the first end of the cover. The second inductor is between the second end of the cover and the ground plane. The cover, the ground plane, the first inductor, and the second inductor are configured to provide a loop radiator.

Abstract: In accordance with one example embodiment of the present invention an apparatus is disclosed. The apparatus includes a cover, a ground plane, a first inductor, and a second inductor. The cover includes a first end and an opposite second end. The cover is configured to operate as a first loop radiator portion. The ground plane is proximate the cover. The ground plane is configured to operate as a second loop radiator portion. The first inductor is proximate the first end of the cover. The second inductor is between the second end of the cover and the ground plane. The cover, the ground plane, the first inductor, and the second inductor are configured to provide a loop radiator.

Abstract: A parasitic antenna including a first portion having a first length; a second portion having a second length, different to the first length; and wherein the second portion includes a folded part which orients a part of the second portion substantially towards the first portion.

Abstract: A multi-band antenna arrangement having a plurality of resonant modes and including a ground plane; and a first antenna forming a loop-like structure between a ground point and a feed point, wherein the first antenna is located in proximity to the ground plane and has resonant modes at X/2 and X.

Abstract: An antenna arrangement including a first antenna element having a first portion and a first feed; and a second antenna element having a second portion and a second feed, different to the first feed, wherein the first antenna element and the second antenna element are relatively arranged and oriented so that the first portion and the second portion run in parallel separated by a gap and so that electric currents generated in the first portion and the second portion travel in substantially the same directions at substantially the same times.

Abstract: An antenna having a first resonant mode and a second resonant mode and including an antenna element, the antenna element including a first portion; a second portion; and at least one bend between the first portion and the second portion, wherein a first part of the first portion opposes a second part of the second portion across a narrow gap and, in use, a maximum of current density for the second resonant mode is at or adjacent each of the first part of the first portion and the second part of the second portion.

Abstract: An antenna comprising: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Abstract: An antenna comprising: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Abstract: An antenna including: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Abstract: A resonant monopole slot antenna comprising a ground plane, having a radiating slot which is dimensioned such that the slot is equivalent electromagnetically to an odd number of quarter wavelengths at the antenna's operating frequency, wherein the antenna's feed is arranged at the open end of the radiating slot.

Abstract: An antenna arrangement comprising: a ground plane; a ground point connected to the ground plane; a feed point; a ?/2 antenna element connected to the ground point and to the feed point and extending between the ground point and the feed point as a loop that defines an area; and a ?/4 antenna element located within the area.

Abstract: An antenna arrangement comprising: a ground plane; a ground point connected to the ground plane; a feed point; a ?/2 antenna element connected to the ground point and to the feed point and extending between the ground point and the feed point as a loop that defines an area; and a ?/4 antenna element located within the area.

Abstract: An antenna arrangement including a first antenna element having a first portion and a first feed; and a second antenna element having a second portion and a second feed, different to the first feed, wherein the first antenna element and the second antenna element are relatively arranged and oriented so that the first portion and the second portion run in parallel separated by a gap and so that electric currents generated in the first portion and the second portion travel in substantially the same directions at substantially the same times.

Abstract: An antenna arrangement for dual mode radio devices such as WCDMA/GSM or Bluetooth radio devices. The arrangement contains two antennas close to each other, where a shorting switch is used at an open end of one antenna to increase isolation by effectively converting the one antenna from a quarter wave length antenna to a half wave length antenna when not needed in order to improve the efficiency of the other antenna. The shorting switch is typically a MEMS switch and the antennas are typically PIFA antennas. A radio device containing the arrangement has also been disclosed.

Abstract: A method of independently modifying the ¼ and/or the ¾ wavelength resonant frequency in an open-ended slotted PIFA antenna, an open-ended slotted PIFA antenna comprising an antenna feed and an antenna ground wherein the antenna ground is associated with the antenna short-circuit end, and an open-ended slot having an open-end associated with the antenna open-circuit end, and wherein the antenna ground and the slot are mutually arranged to provide operational variations in the current density between the open and short circuit ends of the antenna and around the perimeter of the slot, and an operational mean current path length between the open and short circuit ends of the antenna and around the perimeter of the open-ended slot, the mean current path length determining the ¼ and ¾ wavelength resonant frequencies for the open-ended slotted PIFA antenna, the method comprising determining operational variations in current density around the perimeter of a pre-modified open-ended slotted PIFA antenna and modify

Abstract: An antenna including: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Abstract: A resonant monopole slot antenna comprising a ground plane, having a radiating slot which is dimensioned such that the slot is equivalent electromagnetically to an odd number of quarter wavelengths at the antenna's operating frequency, wherein the antenna's feed is arranged at the open end of the radiating slot.

Abstract: An antenna arrangement for dual mode radio devices such as WCDMA/GSM or Bluetooth radio devices. The arrangement contains two antennas close to each other, where a shorting switch is used at an open end of one antenna to increase isolation by effectively converting the one antenna from a quarter wave length antenna to a half wave length antenna when not needed in order to improve the efficiency of the other antenna. The shorting switch is typically a MEMS switch and the antennas are typically PIFA antennas. A radio device containing the arrangement has also been disclosed.

Abstract: A method of independently modifying the ¼ and/or the ¾ wavelength resonant frequency in an open-ended slotted PIFA antenna, an open-ended slotted PIFA antenna comprising