Nokia Customer Care 2115i/2116/2116i (RH-66) Mobile Terminals Antenna Description and Troubleshooting Issue 1 03/2005 Company Confidential ©2005 Nokia Corporation
115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Contents Page Introduction ..................................................................................................................................................... 3 Visual Quality Requirements .................................................................................................................... 3 Failures and Corrective Measures .....................................................................................
Nokia Customer Care 2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Introduction The mobile terminal incorporates an internal antenna. This antenna arrangement is used for AMPS/Cell and PCS frequency bands. The internal antenna assembly consists of a Planar Inverted-F Antenna (PIFA) used for the cellular engine and an Inverted-F antenna (IFA) used for the GPS engine, which is placed on the side of internal antenna body.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Failures and Corrective Measures The internal antenna is assembled into the D-cover as shown in Figure 1. If no internal antenna is installed, the antenna gain is degraded by more than 25 dB. Internal antenna PWB shield Internal antenna Figure 1: D-cover assembly • If the internal antenna is missing, install one. • If the radiator looks obviously damaged, replace the internal antenna.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Nokia Customer Care Damaged RF Feed or Ground Pins The main antenna and the GPS antenna have pins (spring clips) that must properly touch the PWB. • If the main antenna’s RF feed pin does not touch the PWB, the antenna gain degrades by more than 25 dB and the GPS antenna is detuned. • If the ground pin of the main antenna does not touch the PWB, the antenna gain degrades from 5 to 10 dB and the GPS antenna is detuned.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting • The 2115i/2116/2116i includes a GPS antenna. The 2112 does not. Note: GPS is functional only in the 2115i and 2116i. • The main radiators for the 2115i/2116/2116i include markings that begin with an “F”. The 2112 markings begin with a “C”.
Nokia Customer Care 2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Obstructed IHF Speaker, RF Feed, and Ground Pads RF feed pad for GPS antenna Ground pad for GPS antenna IHF speaker pads Ground pad for main antenna RF feed pad for main antenna Figure 5: PWB layout of IHF speaker, RF feed, and ground pads If any of the RF feed or ground pins are obstructed, removed, or covered, the RF pin does not touch the PWB and the antenna performance degrades.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Grounding of Display Frame The display frame is grounded to the PWB through two ground panels. The display frame grounding impacts the radiation performance of the mobile terminal. Display frame grounding through screws Display frame grounding tabs Figure 6: Display assembly ground points • If the clips do not touch the PWB, are corroded, or are obstructed, replace the display frame.
Nokia Customer Care 2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting RUIM Card Flap Grounding The RUIM card flap must be grounded to the RF shield with a conductive sticker. Disassembling the RF shield from the chassis damages the sticker. You must remove the sticker to change the antenna module or the RUIM card flap. If the sticker is damaged or missing, then the radiated sensitivity at maximum power could be reduced by 1-2 dB.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Testing the CDMA Antenna Calibration Factors Use the MJF-28 Docking Station Adapter to define the CPL-8 Antenna Coupler calibration numbers. Obtain the calibration numbers by utilizing a mobile terminal with known RF and antenna performance. Each test adapter should only require a single calibration on PCS1900 and GPS bands at used test frequencies.
2115i/2116/2116i (RH-66) Antenna Description and Troubleshooting Nokia Customer Care Testing the GPS Antenna (2115i/2116i) Calibration Factor for GPS In GPS test mode 3, the GPS receiver is fed with a CW signal. The GPS receiver should report C/No ratio of 35 dBHz with a -110 dBm signal level on the RF connector (-110 dBm + cable loss) at signal generator output. The reported C/No figure is recorded with the signal fed to the RF connector. The C/No value is read with a coupler engaged.
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