手机天线设计手册.pdfVIP

RF expertise Antenna Integration Design Guidelines RF Expertise Antenna 3F optimization (form-fit-function) Close cooperation collaboration with the customer for: SAR and shielding related issues PCB editing and ground plane related issues Impedance matching requirements Integration – microphone, speaker, camera, FPCB, etc. Diversity issues Simulation Rapid prototyping Benchmarking RF Expertise Choice of material ηt ηr ηcηd Use Low loss Plastics and high conductivity radiators ηt total eff iciency 2 ηr reflection efficiency (1−Γ ) ηc conduction efficiency Also effected by ηd dielectric efficiency Hand and Head RF Expertise Hand held positions The hand and head can reduce the signal form 6 – 12 dB’s depending on the phone structure and how the phone is held. Careful consideration to antenna location can help reduce the performance loss. RF Expertise The Ground Plane The length of the phone Chassis has a considerable effect on the performance of the antenna. Chassis length vs Bandwidth for 900/1800MHz 25 20 ) % 15 ( B d 6