Shielding Effectiveness Report HQCD
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1 HQCD Mates with QSH, QTH, QSH-EM Description: 0.50mm Q Strip High Speed Coax Cable Assembly Samtec, Inc All Rights Reserved
2 Table of Contents Product Overview... 1 Test Overview... 1 Shielded Room Noise Floor Verification... 1 Shielding Effectiveness Summary Data... 3 Characterization Details... 4 Product and Test System Descriptions... 4 Product Description... 4 Test System Fixturing... 4 Appendix A Test and Measurement Setup... 6 Test Instruments... 9 Measurement Station Accessories... 9 Samtec, Inc Page:ii All Rights Reserved
3 Product Overview HQCD is a single ended, double-row, 0.5mm pitch, 50 ohm cable assembly. The assemblies use Eye Speed 38 AWG micro ribbon coax cable. HQCD is available in lengths from 43.94mm to 2.54M. Systems are available at up to 180 pins, in surface mount or edge mount configurations. A 1M HQCD STR-TTL-1-B cable assembly was tested for shielding effectiveness. The sample was mated to QTH and QSH test boards. Test Overview IEC Annex F provides a standard test procedure for shielding effectiveness of cable assemblies and serves as the baseline test procedure for this test. Shielding effectiveness is a measure of an electromagnetic shield s performance. Typically, apertures, seams, slots, and holes result in leakage and reduces shielding performance from theoretical limits of >120dB to values in the dB range. Fixturing required to interface a cable assembly to instrumentation is custom for multi-position high-density cable assemblies and can affect test results. For this reason, the test fixtures are documented in detail in this report. For comparison purposes, the sample tested is compared to a 1 meter RG-316 coax cable assembly. This cable uses a single braid, terminated with SMA connectors, and serves as a reference standard. Shielded Room Noise Floor Verification Prior to performing shielding effectiveness testing of a particular sample, it is important to establish the noise floor of the anechoic test chamber by measuring the shielding effectiveness of the receive line while terminated at the bulkhead connector with a precision short. This is, in effect, a perfectly shielded sample. The difference between this measurement and that of an in-band antenna (per IEC ) is the maximum dynamic range of the measurement system. Any sample that has a shielding effectiveness greater than the dynamic range will therefore not be adequately characterized. The Samtec reverb chamber and instrumentation provides a dynamic range of roughly 100dB up to 1GHz and gradually degrades to 50dB at 20GHz. The measurement dynamic range degradation is due to increasing loss in the reverberation chamber metal walls. Samtec, Inc Page:1 All Rights Reserved
4 Samtec, Inc Page:2 All Rights Reserved
5 Shielding Effectiveness Summary Data The graph below shows that the HQCD cable assembly provides roughly 40dB shielding effectiveness in the MHz range and roughly 20-30dB of shielding effectiveness above 500MHz. In contrast, the RG-316 coax with single braid shield provides roughly 50dB of shielding effectiveness. Samtec, Inc Page:3 All Rights Reserved
6 Characterization Details This report presents data that characterizes the shielding effectiveness of a cable assembly in a controlled printed circuit board (PCB) environment. All efforts are made to reveal typical responses inherent to the system under test (SUT). In this report, the SUT includes the cable assembly and mating connectors. The mating connectors are attached to test boards constructed with Samtec recommended footprints and routing practices. Product and Test System Descriptions Product Description The product test sample was a 1 meter long HQCD cable assembly. The cable is terminated by soldering a small transition PCB (termination board) at each end. Each termination board has a connector soldered to it. Each cable assembly was tested by mating it to a QTH/QSH test board connector. The actual part numbers that were tested are shown in Table 1, which also identifies End 1 and End 2 of the assembly. Length Part Number End 1 End mm HQCD STR-TTL-1-B QTH QSH Test System Fixturing All measurements were performed using QTH/QSH test boards PCB The test boards have trace lengths of 94mm and provide for the interconnection to the cable assemblies by use of replaceable SMA connectors. The test board and stackup are shown in the following pictures. Samtec, Inc Page:4 All Rights Reserved
7 QTH/QSH Test board layer stackup QSH test board (left), QTH test board (right) Samtec, Inc Page:5 All Rights Reserved
8 Appendix A Test and Measurement Setup The Mode Stirred Chamber (Reverberation) Method is documented in IEC and was used in this testing. The method relies on exposing a device to electromagnetic energy in a large resonant cavity (shielded room). An electrically large tuner perturbs the boundary conditions of the cavity resulting in different standing wave patterns and a randomized excitation of the device. Multiple device measurements are made at different tuner positions, and the results are averaged. Shielding effectiveness is defined to be relative to an in-band reference antenna for IEC If the shielding effectiveness is 20 db, it means that the received power with the sample in place is 20 db lower than the received power when a reference antenna is in place. A log periodic antenna serves as the reference from 200 MHz to 2 GHz, and a doubleridge guide horn antenna is the reference from 2 GHz to 20 GHz. This method has a practical high frequency limit determined by the instrumentation used, in this case 20 GHz. The low frequency limit is determined by the size of the chamber, which in this case is 200 MHz. The system used for this testing is a SMART 200 system by ETS- Lindgren and is shown in Figure 1. Mode Stirred Chamber Method Samtec, Inc Page:6 All Rights Reserved
9 ETS/Lindgren 2090 Multi-Device Controller and HP Vector Network Analyzer HQCD cable assembly in reverb chamber Samtec, Inc Page:7 All Rights Reserved
10 RG-316 single braid coax cable tested for comparison Samtec, Inc Page:8 All Rights Reserved
11 Test Instruments QTY Description 1 ETS/Lindgren Smart200 Reverberation Chamber 1 ETS/Lindgren 2090 Multi-Device Controller w/ Smart IMM Software 1 HP8720ES 50 MHz 20 GHz Vector Network Analyzer Measurement Station Accessories QTY Description 1 Agilent 3499B Switch Controller 1 Agilent 8762C Coaxial Switch (DC 26.5 GHz) 1 Mini-Circuits ZHL 42W Coaxial Amplifier (10 MHz 4.2 GHz, +30 db gain) 1 Microwave Power L Wideband Amplifier (2 18 GHz, +30 db gain) Samtec, Inc Page:9 All Rights Reserved
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