performance characteristics data sheet features he series compact helical antennas ant-315-he**, ant-418-he** ant-433-he** , ant-916-he** ** = sm (surface-mount) th (through-hole) description radiation pattern in low-cost rf applications a whip antenna generally provides the best overall performance. in many cases, however, the use of a whip is not practical for cost or cosmetic reasons. in instances where a designer is looking for a blend of easy concealment, low cost and good performance, a helical antenna is usually the optimum choice. the he series from linx delivers exceptional performance and ease of use, while maintaining a cost factor appropriate for high-volume applications. linx helical antennas are precisely wound and matched to provide the lowest possible swr at the operational frequency. in addition, the antenna diameter and inter-coil spacing are optimized to provide a wider than typical bandwidth. compact design for easy concealment high-grade phosphoric bronze construction precision wound for consistent performance surface-mount or through-hole styles recipient understands any or all of the above specifications are subject to change without notice and proceeds with integration at own risk. side view .25" 1.5" through-hole style end view od=.35" id=.25" od=.35" id=.25" surface style end views 1.5" .150" .300" groundplane minimum distance to groundplane .50" helical layout example ch1 swr marker vswr = 3.2 helical parallel to ground plane ch1 swr marker vswr = 2.8 helical perpendicular to ground plane part # description ant-315-hesm surface-mount 315 mhz ANT-418-HESM surface-mount 418 mhz ant-433-hesm surface-mount 433 mhz ant-916-hesm surface-mount 916 mhz part # description ant-315-heth through-hole 315 mhz ant-418-heth through-hole 418 mhz ant-433-heth through-hole 433 mhz ant-916-heth through-hole 916 mhz ordering information for applications subject to vibration or shock suggested board layout parallel to groundplane perpendicular to groundplane surface-mount style through-hole style low physical impedance rugged construction very low cost in volume he series antenna patterns have not been fully characterized as of this time. the patterns below illustrate typical patterns for antennas of this type. 1.0" feed trace .18" - .090 width .25 - .45 max. length 0.200" 0.110" (916mhz) wire diameter 0.050
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