Design rules of internal anten...

Design Rules of Internal Antenna for Mobile PhoneDesign Design Rules Rules of of Internal Internal Antenna Antenna for for Mobile Mobile Phone Phone
Electronic Wire & Cable Design Dept. Hitaka Works, Hitachi-Cable, Ltd.
Hitachi-Cable

Typical Structure of Internal Antenna
Radiator
Cu/Ni plating Cu alloy plate

PCB (GND plane)

Min. 20 mm

Min. 40 mm Min. 6 mm Resin Feed Point
(normally SPS)

GND

We can supply the curved antenna also.
Hitachi-Cable

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Basic Design of Internal Antenna
Minimum Size of Antenna
-Antenna size affects on Bandwidth -If VSWR ≤ 3 at each GSM bands (900, 1800 MHz) Approx. 40 (W) X 20 (D) X 6* (H) mm * Depends on shield case height under antenna

PCB
-There must be ground plane under antenna

Distance between Antenna and Back Cover
-0.5 mm typical

Hitachi-Cable

HITACHI CABLE, LTD.
Head Office
Ohtemachi-Building