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1、Document No. S51E01S01CNPage 1of 17FOREM (SHENZHEN) CO., LTD Revision DWebsite: http:/ Tel: 86-755-28136989 Fax: 86-755-28137570 Issue Date 2005-09-22Subject MAIN CRITERIA TO MINIMIZE PASSIVE INTERMODULATION 减少互调的主要方法弗雷通信技术(深圳)有限公司Distribution:Department Quantity Department QuantityPRO 1 PUR 1TECH 1
2、 SSQA 1 HRPMC MDFINPrepared By Checked By Approved ByDocument No. S51E01S01CNPage 2of 17FOREM (SHENZHEN) CO., LTD Revision DWebsite: http:/ Tel: 86-755-28136989 Fax: 86-755-28137570 Issue Date 2005-09-22Subject MAIN CRITERIA TO MINIMIZE PASSIVE INTERMODULATION 减少互调的主要方法弗雷通信技术(深圳)有限公司A 28/02/97 First
3、 Preliminary Emission -S.C.D.O.B 10/02/00 Second Preliminary Emission -S.C.D.O.C 13/04/01 Translation in english language -A.R.D 22/09/05 翻译成汉语，并删除意大利语 AFSC ENG dept.Document No. S51E01S01CNPage 3of 17FOREM (SHENZHEN) CO., LTD Revision DWebsite: http:/ Tel: 86-755-28136989 Fax: 86-755-28137570 Issue
4、 Date 2005-09-22Subject MAIN CRITERIA TO MINIMIZE PASSIVE INTERMODULATION 减少互调的主要方法弗雷通信技术(深圳)有限公司Para Title Pag1. SCOPE 范围 2. APPLICABILITY 适用性3. REFERENCE DOCUMENTS 参考资料4. INTRODUCTION 概述55. PASSIVE INTERMODULATION 被动互调6. POTENTIAL CAUSES OF PASSIVE INTERMODULATION 互调的可能原因7. MINIMIZING THE PASSIVE
5、INTERMODULATION 减小互调 7.1 CONSIDERATIONS AT COMPONENTS LEVEL 考虑组件7.2 FILTERS 考虑腔体7.3 CONSIDERATIONS AT SYSTEM LEVEL 考虑系统8. NOTES ON PASSIVE INTERMODULATION MEASUREMENTS互调测试的提示APPENDICE 附录 1: GALVANIC COUPLE 电耦合APPENDICE 附录 2: LOCKING OF FIXING SCREWS 固定螺钉的锁定APPENDICE 附录 3: LOCKING OF SETTING SCREWS 安
6、装螺钉的锁定APPENDICE 附录 4: LOCKING OF COAXIAL CONNECTORS 同轴连接器的锁定Document No. S51E01S01CNPage 4of 17FOREM (SHENZHEN) CO., LTD Revision DWebsite: http:/ Tel: 86-755-28136989 Fax: 86-755-28137570 Issue Date 2005-09-22Subject MAIN CRITERIA TO MINIMIZE PASSIVE INTERMODULATION 减少互调的主要方法弗雷通信技术(深圳)有限公司1. SCOPE
7、范围The object of this document is to indicate the main criteria to follow in the planning, production and testing of the cellular communication systems, with the aim of minimising the problem of generation of intermodulation products.本文件是通过叙述在蜂窝通讯系统中，设计、生产、测试的一些主要方法，达到减少互调产物的目的。2. APPLICABILITY 适用性Pl
8、anning, production and testing of passive components for the cellular communication systems.蜂窝通讯系统中无源器件的设计、生产、测试。3. REFERENCE DOCUMENTS 参考资料1. J. King “Intermodulation in Coaxial Connectors”, RF Design, p.68, Settembre 1996 同轴连接器的互调2. M. Lang “The Intermodulation Problem in Mobile Communications”,移动
9、通信的互调问题Microwave Journal, p.20, Maggio 19953. CPE Italia “Intermodulation Tests on Cables and Connectors”, Febbraio 1995电缆与连接器的互调4. B. Carlson “RF/Microwave Connector Design for Low Intermodulation Generation”, 低互调射频/微波连接器的设计Interconnection Technology, p.23, Luglio 19935. C. Brocheton “Radiall Inter
10、modulation Measurement System”, Dicembre 1992光纤互调测量系统6. C. Young “Connector Design Techniques to Avoid RFI”, 避免射频互调的连接器设计技术Naval Research Laboratory, Novembre 19927. C. Young “An Update on Intermodulation Generation by RF Connector Hardware Containing Ferromagnetic Materials” Naval Research Laborato
11、ry, Ottobre 1976 Document No. S51E01S01CNPage 5of 17FOREM (SHENZHEN) CO., LTD Revision DWebsite: http:/ Tel: 86-755-28136989 Fax: 86-755-28137570 Issue Date 2005-09-22Subject MAIN CRITERIA TO MINIMIZE PASSIVE INTERMODULATION 减少互调的主要方法弗雷通信技术(深圳)有限公司4. INTRODUCTION 概述The problem with the generation of
12、 intermodulation products in multi-carrier radio communication systems in general (as in communications via satellite) and in the industry of moblie communication in particular, has become increasingly more bothersome for various similar reasons: the request for increased channel capacity, the progr
13、essive increase of carrier potency and increased sensitivity thrust in the receiver systems. 由于多方面的原因，比如 信道容量的增加，载波功率的递增，接收系统灵敏度的提高，在多载波的无线电通信系统中，尤其是移动行业，互调产物的问题变的越来越麻烦。Intermodulation products are impure products that can originate in passive systems as well, therefore, perfectly linear in theory,
14、because of the presence of undesired non-linearities; these latter generate new frequencies that can fall into the receiver band of the system, damaging the quality of the signal received. 由于非线性的存在,即使在理论上很线性的无源系统也会产生互调产物,在系统的接收频段内生成影响接收信号质量的,新的频率信号。In the base stations of mobile communication system
15、 GSM, DCS1800 and PCS1900, the requests are typically of the order -163 dBc (or -120dBm in the case where two carriers of 43dBm each are used). The request is thus severe, because the connectors (that are one of the major sources of intermodulation products) are used also in the post-filtering section of the transmission route (between the duplexer and the antenna), and because the system is typically full-duplex, that i
