Product category:
Antennas and Feeders
News Release from: Antenova | Subject: HDA 2000
Edited by the Electronicstalk Editorial
Team on 25 February 2003
Coexistence antenna has 2.45GHz
standards covered
A novel antenna allows dual-mode 802.11b and Bluetooth access points to be constructed without the large antenna spacings typically needed to avoid interference between channels.
Antenova has developed a novel antenna that allows dual-mode 802.11b and Bluetooth access points to be constructed without the large antenna spacings typically needed to avoid interference between channels The design supports simultaneous transmission or coexistence of the protocols on the shared 2.45GHz ISM frequency band, using ceramic antennas mounted just 6cm apart
This article was originally published on Electronicstalk on 13 Dec 2002 at 8.00am (UK)
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The HDA 2000 is a dual-antenna solution for combined Bluetooth and 802.11b access points or devices.
The compact and embedded nature of the antennas makes it possible to build exceptionally small access points that may be mounted unobtrusively on walls or desktops.
This advance is made possible by Antenova's unique high dielectric antenna (HDA) technology.
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The use of high dielectric ceramic materials in HDAs results in a highly localised near field around the antenna.
This allows antennas to be mounted very closely together without suffering from coupling effects experienced by conventional antennas.
The antennas are additionally designed to provide noninterfering, polarised transmission patterns - another novel possibility opened up by HDA.
"Antennas have remained much the same for decades - to the point where they are holding back product innovation", says Greg McCray, CEO of Antenova.
"Antenova's antenna technology provides new design flexibility for developers - providing an enabling force for new types of wire-free lifestyle products such as multiprotocol access points".
In this instance, Antenova's HDA 2000 design provides more than 40dB of isolation between 802.11b and Bluetooth when spaced apart by just 6cm.
HDA 2000 can be supplied in form of an example design, as a PCB with two surface-mounted ceramic antennas arranged orthogonally, with design documentation including antenna gain plots.
Each 50ohm antenna provides a 100MHz bandwidth centred on 2.45GHz, a peak gain of over 2dBi, and a VSWR of 2:1 maximum.
The design is easily integrated inside product housings with negligible effect on performance.
Each surface-mounting ceramic antenna is less than 16mm long and 5mm high and is easy to assemble - avoiding the problems associated with external aerials and helping OEMs to create robust consumer products.
Using more conventional antenna materials, the separation distance required to avoid coupling effects between two 2.45GHz antennas would probably need to be at least double that of the HDA 2000, making it difficult for OEMs to create attractive products for emerging mass volume markets.
Even closer antenna spacings are possible, supporting the implementation of multiprotocol communications on handheld terminals such as PDAs.
This example multiprotocol 802.11b and Bluetooth antenna design is optimised for low-cost and provides only one antenna per protocol.
However, HDA technology is highly suitable for implementing 'antenna diversity' (multiple polarised antenna) solutions - a feature employed by some 802.11b equipment - and the antenna array is easily extended.
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