# RF Antenna, 305 to 325MHz, Helical, 50ohm, Linear, Through Hole
**URL**: https://novapart.co/products/ANT-315-HETH/rf-antenna-305-to-325mhz-helical-50ohm-linear
**SKU**: ANT-315-HETH
**Manufacturer**: LINX - TE CONNECTIVITY
**Price**: €0.8240
**Stock**: 10+
**Lead Time**: 159 days (indicative)
## Specifications
| Parameter | Value |
|---|---|
| Gain | - |
| Svhc | No SVHC (27-Jun-2024) |
| Vswr | 2 |
| Input Power | - |
| Antenna Type | Helical |
| Frequency Max | 325MHz |
| Frequency Min | 305MHz |
| Product Range | HE Series |
| Input Impedance | 50ohm |
| Antenna Mounting | Through Hole |
| Antenna Polarisation | Linear |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:4205484/)
## **ANT-315-HETH Data Sheet**
by
## Product Description
HE Series antennas are designed for direct PCB mounting. Thanks to the HE’s compact size, they are ideal for internal concealment inside a product’s housing. The HE is also very low in cost, making it well suited to high-volume applications. HE Series antennas have a very narrow bandwidth; thus, care in placement and layout is required. In addition, they are not as efficient as whip-style antennas, so they are generally better suited for use on the transmitter end where attenuation is often required anyway for regulatory compliance. Use on both transmitter and receiver ends is recommended only in instances where a short range (less than 30% of whip style) is acceptable.
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8.89 mm
Outside
Diameter (0.35")
<—|
Inside 6.35 mm
Diameter (0.25")
Wire
Diameter
1.27 mm
(0.05")
38.10 mm
(1.50")
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## Features
## Recommended Mounting
Electrical Specifications Center Frequency: 315MHz Recom. Freq. Range: 305–325MHz Wavelength: ¼-wave VSWR: < 2.0 typical at center Impedance: 50-ohms Connection: Through-hole Oper. Temp. Range: –40°C to +80°C
24.13 cm (3.00" x 9.50") reference ground plane.
## Ordering Information
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No ground plane or traces No electircal
under the antenna connection on this
pad. For physical
38.10 mm support only.
(1.50")
| kk Ø1.52 mm J
7.62 mm
(0.060")
(0.30")
3.81 mm
12.70 mm
| oof le (0.15")
(0.50")
Ground plane on
50-ohm microstrip line
bottom layer for
counterpoise
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ANT-315-HETH (helical, through-hole)
– **1** –
Revised 5/16/16
## Counterpoise
Quarter-wave or monopole antennas require an associated ground plane counterpoise for proper operation. The size and location of the ground plane relative to the antenna will affect the overall performance of the antenna in the final design. When used in conjunction with a ground plane smaller than that used to tune the antenna, the center frequency typically will shift higher in frequency and the bandwidth will decrease. The proximity of other circuit elements and packaging near the antenna will also affect the final performance. For further discussion and guidance on the importance of the ground plane counterpoise, please refer to Linx Application Note AN-00501: Understanding Antenna Specifications and Operation.
## VSWR Graph
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VSWR 1.166 Reflected Power
3:1 25%
2:1 11%
1:1 0%
215MHz 315MHz 415MHz
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## What is VSWR?
The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load versus the voltage wave that is reflected back from the load. A perfect match will have a VSWR of 1:1. The higher the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side note, since the “:1” is always implied, many data sheets will remove it and just display the first number.
## How to Read a VSWR Graph
VSWR is usually displayed graphically versus frequency. The lowest point on the graph is the antenna’s operational center frequency. In most cases, this will be different than the designed center frequency due to fabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linx specifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1.
159 Ort Lane, Merlin, OR, US 97532 Phone: +1 541 471 6256 Fax: +1 541 471 6251 www.linxtechnologies.com
Data Sheet ANT-315-HETH
**– 2** –
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## **TE TECHNICAL SUPPORT CENTER**
USA: +1 (800) 522-6752 Canada: +1 (905) 475-6222 Mexico: +52 (0) 55-1106-0800 Latin/S. America: +54 (0) 11-4733-2200 Germany: +49 (0) 6251-133-1999 UK: +44 (0) 800-267666 France: +33 (0) 1-3420-8686 Netherlands: +31 (0) 73-6246-999 China: +86 (0) 400-820-6015
## **te.com**
TE Connectivity, TE, TE connectivity (logo), Linx and Linx Technologies are trademarks owned or licensed by the TE Connectivity Ltd. family of companies. All other logos, products and/or company names referred to herein might be trademarks of their respective owners.
The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application.
TE Connectivity warrants to the original end user customer of its products that its products are free from defects in material and workmanship. Subject to conditions and limitations TE Connectivity will, at its option, either repair or replace any part of its products that prove defective because of improper workmanship or materials. This limited warranty is in force for the useful lifetime of the original end product into which the TE Connectivity product is installed. Useful lifetime of the original end product may vary but is not warrantied to exceed one (1) year from the original date of the end product purchase.
©2023 TE Connectivity. All Rights Reserved.
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## Links
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- [Supplier page](https://es.farnell.com/linx-te-connectivity/ant-315-heth/rf-antenna-305-to-325mhz/dp/4205484)
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