Motorola Corporation

Lorenzo Ponce De Leon

Paul M Greco

Clinton C Powell, Ii

Lu Chang

Jian-Cheng Huang

David R Petreye

James Michael Keba

Chun-Ye Susan Chang

Jan-Ove U Mattsson

Adam R Aron

A bowtie monopole antenna is fabricated of a sheet metal radiating bodythat is triangular shaped, and having a longitudinal dimension and axis () and a width (). One corner of the radiating body is tapered to form a feed point (). The length dimension determines the antenna's lowest resonance frequency while the taper created by the width determines the highest point of resonance. For using the bowtie monopole antenna in a communication device, the radiating body () is folded or wrapped around towards itself To facilitate the folding or wrapping a mounting substrate () is used. The substrate may be provided with retaining features () to capture the antenna assembly within the communication device.

Bowtie monopole antenna and communication device using same

A communication device (400) with a polarization diversity antenna configuration, having a first antenna (410) with a first plane of polarization and a second antenna (412) with a second plane of polarization. Signal strength of a demodulated signal when the antenna switch (420) is coupled to one of the antennas (410, 412) is measured by a signal strength measuring circuit (440) to generate a short-term average signal power (SA) representing signal strength over a first predetermined number of symbol periods, a medium-term average signal power (MA) representing signal strength over a second predetermined number of symbol periods, and a long-term average signal power (LA) representing signal strength over a third predetermined number of symbol periods, greater than the second predetermined number of symbol periods and first predetermined number of symbol periods. Switching between antennas (410, 412) is made in response to differences between SA, MA and LA.

Communication device having antenna switch diversity, and method therefor

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Lake Worth, FL, United States of America

Lorenzo Ponce De Leon