D ATA S H E E T HE SERIES COMPACT HELICAL ANTENNAS ANT-315-HE**, ANT-418-HE** ANT-433-HE**, ANT-916-HE** ** = SM (SURFACE-MOUNT) TH (THROUGH-HOLE) DESCRIPTION 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. Side View 1.5" Surface-Mount Style Surface Style OD=.35" ID=.25" End Views F E AT U R E S • • • • Compact design for easy concealment High-grade phosphoric bronze construction Precision wound for consistent performance Surface-mount or through-hole styles • • • Low physical impedance Rugged construction Very low cost in volume Through-Hole Style OD=.35" ID=.25" PART # DESCRIPTION PART # DESCRIPTION ANT-315-HESM SURFACE-MOUNT 315 MHZ ANT-315-HETH THROUGH-HOLE 315 MHz ANT-418-HESM SURFACE-MOUNT 418 MHZ ANT-418-HETH THROUGH-HOLE 418 MHz ANT-433-HESM SURFACE-MOUNT 433 MHZ ANT-433-HETH THROUGH-HOLE 433 MHz ANT-916-HESM SURFACE-MOUNT 916 MHZ ANT-916-HETH THROUGH-HOLE 916 MHz PERFORMANCE CHARACTERISTICS CH1 SWR Wire Diameter 0.050” Through-Hole Style ORDERING INFORMATION Helical Parallel to Ground Plane .25" End View Suggested Board Layout Helical Layout Example 1.5" .300" Minimum distance to groundplane .50" .150" Helical Perpendicular to Ground Plane CH1 SWR Groundplane (916MHz) 0.200" MARKER VSWR = 3.2 Feed Trace .18" - .090 width .25 - .45 max. length MARKER VSWR = 2.8 R A D I AT I O N PAT T E R N ; ;;;; ;;;; ;;;;; 0.110" HE Series antenna patterns have not been fully characterized as of this time. The patterns below illustrate typical patterns for antennas of this type. Perpendicular to Groundplane 1.0" Parallel to Groundplane For Applications Subject to Vibration or Shock Recipient understands any or all of the above specifications are subject to change without notice and proceeds with integration at own risk.