Single or dual band parasitic antenna assembly

摘要: A compact single or multiple band antenna assembly for wireless communications devices. One multi-band embodiment includes a high frequency portion and low portion, both fed at common point by feed line. Both portions may be formed as stamped metal part metallized plastic part. The overall size is suitable integration within device such cell phone. consists of two resonant sections which are stagger tuned to achieve wide bandwidth, thus allowing greater tolerance manufacturing variations temperature than section, useful antennas well where it used enhance bandwidth dual well. operate in conjunction with second planar conductor, provided the ground trace printed wiring board device. provides moderate front-to-back ratio 3-12 dB forward gain +1 +5 dBi. front back reduces near field toward user hand held device, reducing SAR (specific absorption rate) RF energy body during transmit. pattern beam width increased handset normal operation, compared half wave dipole.