测量表征2400 2500 mhz的总信号发射

Michael G. BiggsFrank H. SandersBradley J. Ramsey U.S DEPARTMENT OF COMMERCERonald H. Brown, Secretary Larry Irving, Assistant Secretaryfor Communications and Information, andAdministrator, National Telecommunicationsand Information Administration AUGUST 1995 ABSTRACT This report provides the results of radio spectrum measurements performed tocharacterize the aggregate signal emissions present in the 2400-2500 MHz industrial, scientific,and medical (ISM) band and adjacent frequency bands. These measurements were performed atlocations near Denver, Colorado and Los Angeles, California, and included various frequencydomain and time domain tests utilizing omni-directional and directive antennas. The informationcontained in this report can serve as an aid to designers developing equipments to operate inthese frequency bands, as well as authorities seeking to enhance compatibility between ISMdevices and other radio services. It should be noted that the frequency bands 2400-2402, 2402--2417 and 2417-2450 MHz have recently been reallocated from Federal use to non-Federal use inresponse to the requirements of Title IV -- Communications Licensing and Spectrum AllocationImprovement -- of the Omnibus Budget Reconciliation Act of 1993. This further enhances theattractiveness of these frequency bands to equipmenanufacturers.t m KEY WORDS Industrial, Scientific and Medical (ISM) EquipmentMicrowave OvensAggregate Environment2300-2600 MHz ACKNOWLEDGEMENT This report could not have been completed without the efforts of the NationalTelecommunications and Information Administration (NTIA) Institute for TelecommunicationsSciences (ITS). The ITS Spectrum Use Measurement Group provided data collected with theRadio Spectrum Measurement System. In particular, technical support from John Ewan wasessential to the completion of the measurements. CONTENTS SECTION 1 INTRODUCTION............................................................................................................................. 1BACKGROUND.................................................................................................................. 1OBJECTIVE..........................................................................................................................3APPROACH.......................................................................................................................... 3 SECTION 2 RULESANDREGULATIONS..................................................................................................... 5ALLOCATIONS.................................................................................................................. 5REGULATIONSANDSTANDARDS.......................................................................... 6 SECTION 3 MEASUREMENTSANDANALYSES..................................................................................... 8PROCEDURES.................................................................................................................... 8The Spectrum Analyzer........................................................................................ 8RESULTS............................................................................................................................. 10General.................................................................................................................... 10Background and Dominant Oven Environments........................................ 11Diurnal Variation................................................................................................. 11Aggregate Signal Amplitude............................................................................ 11Omni Versus Directional Antennas................................................................ 17 SECTION 4 RESULTS...........................................................................................................................................22CONCLUSIONS...............................................................................................................22 SECTION 1 INTRODUCTION BACKGROUND The National Telecommunications and Information Administration (NTIA) is responsiblefor managing the Federal Government's use of the radio frequency spectrum. NTIA'sresponsibilities include establishing policies concerning spectrum assignment, allocation and use,and providing the various departments and agencies with guidance to ensure that their conduct oftelecommunications activities is consistent with these policies (NTIA Manual of Regulations andProcedures for Federal Radio Frequency Management). In support of these responsibilities,NTIA has undertaken a number studies to assess, spectrum utilization, identify existing and/orpotential compatibility problems between systems of various departments and agencies, providerecommendations for resolving any compatibility conflicts, and recommend changes to promoteefficient and effective use of the radio spectrum and to