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QUICK-CONNECT ADAPTER FOR HANDSET CONDUCTIVE MEASUREMENTS

IP.com Disclosure Number: IPCOM000007322D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-14
Document File: 3 page(s) / 98K

Publishing Venue

Motorola

Related People

Gary Adair: AUTHOR [+2]

Abstract

The transceiver performance of personal com- munications devices with integral antenna must be accurately measured as an assembled product to ensure adherence to published specifications. Although the performance may be characterized quite well on an open area test site, this method is not practical for routine measurements. As an alter- native to the open area test site, factory end-of-line and other bench level testing has, in many cases, been done with a radiation fixture designed to cou- ple the input/output of the handset antenna to a fixed transmit/receive antenna located in the tix- ture. Users ofsimple radiation fixtures are cautioned as to the accuracy of this method. It is very difficult to achieve an accuracy of better than 3 dB. In order to calibrate a radiation fixture, the radiated output level of the device under test must be known. This is a serious limitation because it implies that the unit under test must first be characterized on an open area test site, in an anechoic chamber or in a GTEM cell.

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MOZOROLA Technical Developments Volume 24

March 1995

QUICK-CONNECT ADAPTER FOR HANDSET CONDUCTIVE MEASUREMENTS

by Gary Adair and Argyrios Chatzipetros

  The transceiver performance of personal com- munications devices with integral antenna must be accurately measured as an assembled product to ensure adherence to published specifications. Although the performance may be characterized quite well on an open area test site, this method is not practical for routine measurements. As an alter- native to the open area test site, factory end-of-line and other bench level testing has, in many cases, been done with a radiation fixture designed to cou- ple the input/output of the handset antenna to a fixed transmit/receive antenna located in the tix- ture. Users ofsimple radiation fixtures are cautioned as to the accuracy of this method. It is very difficult to achieve an accuracy of better than 3 dB. In order to calibrate a radiation fixture, the radiated output level of the device under test must be known. This is a serious limitation because it implies that the unit under test must first be characterized on an open area test site, in an anechoic chamber or in a GTEM cell.

  The most accurate and reliable measurements of transceiver performance are obtained by making a direct connection between the transceiver input/output port and the test equipment. Many per- sonal communications devices are designed with a

detachable antenna, but without a standard connec- tion to the transceiver input/output, test equipment

cannot be easily attached. The solution to this prob- lem is to provide an adapter which can be inserted in place ofthe detachable antenna. The a...