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Browse Prior Art Database

BCM ANTENNA

IP.com Disclosure Number: IPCOM000009489D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-28
Document File: 2 page(s) / 64K

Publishing Venue

Motorola

Related People

Dave Norton: AUTHOR [+4]

Abstract

One of the principle factors that determine the effectiveness of an Rf based receive system is the antenna. The geometry of the antenna structure and the relationship to its counterpoise (i.e. ground plane) determine feed impedance and efficiency. Once the design parameters of the antenna have been established the input electronic circuitry is optimized for best sensitivity. If the antenna para- meters (geometry) deviate from the design intent the result will be measurable reduction in sensitivity.

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MOlOROLA Technical Developments

BCM ANTENNA

by Dave Norton, Don Peacock, Jeff Pflug and Joe Vinci

  One of the principle factors that determine the effectiveness of an Rf based receive system is the antenna. The geometry of the antenna structure and the relationship to its counterpoise (i.e. ground plane) determine feed impedance and efficiency. Once the design parameters of the antenna have been established the input electronic circuitry is optimized for best sensitivity. If the antenna para- meters (geometry) deviate from the design intent the result will be measurable reduction in sensitivity.

  Previous antenna design geometries depended on forming the antenna with many bends and angles to create a friction fit in the printed circuit board (see Figure 1). Unfortunately, due to tolerance stackups the friction fit was not consistent. This

made the antenna difficult to assemble to the pc board. During further processing the antenna could move in the board, creating excessive variation in the effective geometry and the resultant signal degradation.

  The EBM antenna by its design locates more of its mass over the two board mounting posts. The antenna is less likely to move during downstream processing, eliminating the need for the friction fit (makes it a drop-in design) and the associated toler- ance issues. Ease of assembly improves and the effective geometry is more consistent. The geome- try also incorporates radii such that the antenna is positioned properly in th...