【正文】 Rating, Temperature Range, and other environmental requirements are all key specifications. ? 5. Coupling Type Choose between Threaded, Bayo, Snapon, and Pushpull based on all of the above. Connector Selection ? Coupling style – Frequency range: 6 Ghz – Power Handling: 5 Watts Average – RF Leakage: 70 dB (Eliminates Push on or Bayo styles) – PIM requirements: None ? Connector style – Impedance: 50 Ohms – Return Loss: 20 dB – Insertion Loss: dB – Mechanical Restrictions – Available Real Estate: .5 “ long – Cable: RG142 ? Cost, other mechanical requirements, etc. N, TNC, SMA, 716 SMA, TNC Final Connector Choice Connector Selection Amphenol174。 ?o = 4?x107 H/m。ln2 ????? ???? = ?o?r。2ln????? ???For parallel twowire line: For coaxial cable: dDZdDCdDLro ln60。 Type N QMA ? Technologies Supported – Satellite Radio – Global Positioning Systems (GPS) – Cellular / PCS – Bluetooth – Broadband – Remote Vehicle Diagnostics/ Keyless Entry Automotive Market Automotive Market ? RF Solutions – FAKRA I – Amphenol FAKRA II – Size 8 Contacts – SMB – SMP – MiniUHF – MMCX – MCX ? Market Drivers – GM – Delphi – XM Satellite Radio – Sirius Satellite Radio – M/A Com MiniUHF FAKRA III Broadband Market ? Technologies Supported – SetTop Boxes – Transmission – Switches and Routers – Cable Modem Termination Systems (CMTS) ? RF Solutions – F Connectors – G Connectors – AFI Gang Mate Connectors – MCX Broadband Market ? Market Drivers – Alcatel – Cisco – Dell – Echostar – Motorola BCS – RCA Thomson – Scientific Atlanta AFI GangMate ? Technologies Supported – Access Points – Routers / Switches – Notebook PC’s – PDA – PCI Card – PCMCIA cards WLAN Market ? RF Solutions – AMC Series, – SMA, SMB, mini 75Ohm SMB – LMR Cable Assemblies – TNCMMCX MicroCables – MC Card – MCX, MMCX PCB launchers Connector Anatomy ? What is a Connector? – A connector is a device used to connect to cables or other devices through which electromagic energy is transferred from one place to another – BodyContactInsulator Body Contact Insulator Connector Anatomy ? Lots of changes in a very short length ? Mechanical rigidity – Hold Contacts in place – Prevent Insulator rotation or lateral movement – Adapt to different cable sizes – Transform between connector series ? Creates many impedance variations or discontinuities in a very short distance ? Reflections are important, Attenuation not as important Body Contact Insulator Connector Anatomy Discontinuity Compensation Steps Dielectric Support Bead Contact Barb Slotted Contact Cable Anatomy ? What is Cable? – Cable is a transmission line through which electromagic energy is propagated and transferred from one place to another – JacketBraidShieldDielectricCenter Conductor Conductor Dielectric Jacket Shield Braid Cable Anatomy ? No changes in a very long length ? No impedance changes or discontinuities – Usually very few reflections, but Attenuation is important Assistance on the Web ? Amphenol RF Newsletter ? Technical Questions: ? VSWR Conversion Charts: ? Glossary: ? Our inter site Understanding RF 1. Transmission Lines 2. Impedance 3. Frequency Range 4. Return Loss/VSWR 5. Insertion Loss 6. Passive Intermodulation Distortion 7. Power HandlingVoltage 8. IsolationCrosstalk 9. RF Leakage 10. Cable Assembly 1. Transmission Line ? What is a transmission line? – A transmission line is a conduit by which electromagic energy is transferred from one place to another ? Coaxial Cable Unbalanced Line: Center conductor surrounded by a concentric dielectric and outer conductorMost popular type of transmission line 1. Transmission Line ? What is a transmission line? – A transmission line is a conduit by which electromagic energy is transferred from one place to another ? Waveguide: Rectangular, Circular 1. Transmission Line ? What is a transmission line? – A transmission line is a conduit by which electromagic energy is transferred from one place to another ? Planar Transmission Line: Microstrip, Stripline, Coplanar waveguide are most mon 1. Transmission Line ? What is a transmission line? – A transmission line is a conduit by which electromagic energy is transferred from one place to another ? Twin Line balanced line: two parallel conductors separated by a dielectric . . 1. Transmission Line ? Differential or balanced lines (where neither conductor is grounded): . twin lead, twistedcable pair, and shieldedcable pair. ? Singleended or unbalanced lines (where one conductor is grounded): . concentric or coaxial cable. 1. Transmission Line ? The type of transmission line will determine the connector style – Cable ConnectorCoaxial Cable, Twin Line – Surface Mount ConnectorMicrostrip – Tab Launch ConnectorMicrostrip, Stripline, Coplanar – End Launch ConnectorMicrostrip, Coplanar – Pin Launch ConnectorMicrostrip, Stripline, Coplanar 2. Impedance R L R L C G C G L L C C “ Lossy” Line Lossless Line CjGLjRZo ?????CLZo ?Zo Zo 2. Impedance ? Characteristics of a line is determined by its primary electrical constants or distrib