SL1250 GeoHelix P2.5. Passive GPS Antenna (Preliminary Datasheet)

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Johnathan Gardner
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SL1250 GPS antenna provides high performance in diffi cult GPS applications using a quadrafi lar helix design.

materials that would de-tune conventional antennas; the antenna is tigh

allocated to ground planes; the orientation of the device is random; or the antenna will be embedded in the device.

antenna have negligible de-tuning effects and the antenna maintains its pattern and effi ciency in the presence of dielectric

As a dielectrically-loaded antenna, the SL1250 acts as its own fi lter, attenuating signals from common GSM and ISM frequencies

The SL1250 is similar in size to the SL1200, using the same ceramic element, but has a number of enhances over the SL1200.

1 SL1250 GeoHelix P2.5 Passive GPS Antenna (Preliminary Datasheet) Product Description Built on patented PowerHelix fi ltering antenna technology, the SL1250 GPS antenna provides high performance in diffi cult GPS applications using a quadrafi lar helix design. The SL1250 antenna is ideal in applications where: the device is handheld, body-worn, or otherwise surrounded by high-dielectric materials that would de-tune conventional antennas; the antenna is tightly integrated with other antennas, e.g., Bluetooth /GPS receivers or GPS/GSM mobile phones; there are tight constraints on the size of the device or the amount of space allocated to ground planes; the orientation of the device is random; or the antenna will be embedded in the device. The SL1250 antenna is balanced, which isolates it from the device and enables the antenna to reject common mode noise resident on the device ground plane. The construction and materials of the antenna constrain its near-fi eld to a very small volume, therefore materials near the antenna have negligible de-tuning effects and the antenna maintains its pattern and effi ciency in the presence of dielectric loading. As a dielectrically-loaded antenna, the SL1250 acts as its own fi lter, attenuating signals from common GSM and ISM frequencies by as much as 30dB without external fi ltering. The SL1250 is similar in size to the SL1200, using the same ceramic element, but has a number of enhances over the SL1200. These include: Improved antenna ruggedness. The new feed system requires less mechanical support and is capable of withstanding higher stresses Simplifi ed interconnection system. Antenna can be connected using either simple contacts or hot air soldered to the product board Specifications Minimum Typical Maximum Unit Part Number SL1251 (Embedded) or SL1252 (Low Frequency) Each Type Quadrafi lar Helix Embedded Frequency MHz Polarization Right-hand circular polarized Integrated Gain(on PCB-see page 6) -3.0dBic zenith Beamwidth >135 Degrees Bandwidth (3dB) 15 MHz Axial Ratio(Free Space) VSWR <2.0:1 2.3:1 Impedance 50 Ω Operating Temperature C Element Dimensions 10 (diameter) x (length) mm Weight 7.0 grams Sarantel UK info@sarantel.com Specifi cations subject to change 1 v3 Iss Sarantel Ltd. 2012

Radiating Section Styron Sleeve for Embedding Balun Gnd RF(50Ω) Gnd Radiation Pattern (dbic) The SL1250 GPS antenna provides similar performance to the SL1200 (GeoHelix-P2) antenna, with typical peak

The strength of the PowerHelix antenna technology is its immunity to de-tuning in the presence of dielectric loading, like human tissues.

Typical Impedance Though it will not electrically couple with a ground plane, the SL1250 antenna can be expected to increase effi ciency by up to 30% when mounted over a ground plane due to near-fi

2 Radiating Section Styron Sleeve for Embedding Balun Gnd RF(50Ω) Gnd Radiation Pattern (dbic) The SL1250 GPS antenna provides similar performance to the SL1200 (GeoHelix-P2) antenna, with typical peak gain of -3dBic, excellent beamwidth and strong circular polarization. The strength of the PowerHelix antenna technology is its immunity to de-tuning in the presence of dielectric loading, like human tissues. GeoHelix antennas retains effi ciency and polarization near the human body. Conventional antennas lose 5-10dB of gain in similar circumstances. Typical Impedance Though it will not electrically couple with a ground plane, the SL1250 antenna can be expected to increase effi ciency by up to 30% when mounted over a ground plane due to near-fi eld signal refl ections. Confi guration and orientation of the ground plane with respect to the antenna will vary results, but effi ciency will not decrease. The SL1250 antenna is optimized for 50Ω impedance to simplify the matching process. The Smith chart showing a typical impedance plot of the antenna has been normalized to 1. The resonant frequency of the antenna is shown at the marker, and the bandwidth of the antenna is shown by the dimensions of the loop. The red circle shows the VSWR<=2.3:1 impedance mask. As with the pattern chart, it is important to note the immunity of the antenna to loading factors in close proximity. It can be seen that the impedance of the antenna changes very little until a phantom hand is placed inside a radius of 10mm from the antenna. 2

3 Return Loss Immunity from bio-loading effects can be demonstrated effectively through the S11 plot. While some change in match is observed as a phantom hand is moved closer to the radiating section of the antenna, minimal de-tuning occurs. The SL1200 antenna also demonstrates a sharp fi ltering response in bands near the desired resonant frequency. Filtering Response 3

Embedding Information The SL1250 antenna is available with two frequency options, the SL1251 with a free space frequency of 1603.5MHz and the SL1252 with a free space frequency of 1593.

4 Embedding Information The SL1250 antenna is available with two frequency options, the SL1251 with a free space frequency of MHz and the SL1252 with a free space frequency of MHz, to suit various embedding requirements. The SL1251 antenna is typically designed to be embedded in a device with the plastic tuning sleeve to ensure onfrequency performance. Ground planes within 5mm of the antenna radiating section can affect the performance of the antenna. The SL1252 antenna is designed to be typically mounted externally either with the radome available from Sarantel or within the customers own radome. See the Ordering Guide section of this document for details on which version of the antenna should be ordered to suit specifi c requirements. Additional mechanical support should be provided to hold the antenna in place. For further information on embedding either the SL1251 or SL1252 antennas please refer to the Mechanical Integration Guideline documents available on the Sarantel website Ordering Guide for the SL1250 antenna Part Number Description MOQ Pack Size SL1251 GeoHelix P2.5 Emb Ant SL1251SF GeoHelix P2.5 Emb Ant+Sleeve SL1252 GeoHelix P2.5 LF Ant SL1252SF GeoHelix P2.5 LF Ant+Sleeve SL1252R GeoHelix P2.5 LF Ant+Radome Notes 1. Orders placed for below MOQ or not in multiples of pack quantities will be subject to a $50 handling fee 2. For further guidance on selecting the correct part number please contact Sarantel distributors or info@sarantel.com 4

5 Mechanical Drawings - SL1250 5

6 Mechanical Drawings Sleeve 6

7 RoHS Compliance Statement SL1250 Product Specification v3 Iss

8 About Sarantel Sarantel designs and manufactures dielectrically loaded antennas based on patented PowerHelix fi ltering antenna technology. Sarantel s antennas are ideal for applications in which the radio device is small, handheld, or body-worn, or in devices with multiple transceivers and high levels of common mode noise. Sarantel antennas can be mounted externally or easily embedded within a device. GeoHelix, PowerHelix, and the Sarantel logo are registered trademarks of Sarantel Ltd. Contact Sarantel Sarantel Ltd. (HQ) 2 Ryle Drive, Park Farm South Wellingborough, NN8 6BA United Kingdom Ph: Fax: info@sarantel.com Web: Application Support Sarantel are committed to our customers success, and so offer a variety of support options for customers designing RF products. Check the Sarantel Applications Centre for the latest production specifi cations, technical notes, and application guides for solutions to the most common antenna integration issues. Contact our applications support group by at info@ sarantel.com for detailed product specifi cations, including mechanical drawings, surface mount pad layout, embedding recommendations, and other application questions not answered in the technical literature. For further support options, please contact your local sales representative at Global Distributors & Representatives Sarantel strongly believes in the value of intellectual property and the right of entrepreneurs to protect what they have created. Sarantel demonstrates its commitment to this principle by continuously developing its technology and then filing patents in a number of regions around the world. Additionally, Sarantel is constantly filing new patent applications and has a substantial portfolio of pending applications. A list of Sarantel s granted patents; Australia; , , , , Austria; Brazil; PI Canada; , , , , , , , China; ZL , ZL , ZL , ZL , ZL , ZL , ZL , ZL Denmark; , Finland; , , , , , , , , , France; , , , , , , , , , , , Germany; , , , , , , , , , , India; , , , , Italy; , , , , , , , Japan; , , , , , , , , , , Malaysia; MY A, MY A, MY A, MY A Mexico; , , , , , , , , Netherlands; , New Zealand; , Philippines; , , , , Russia; , , Singapore; 37745, 54891, 56480, , South Korea; , , , , , , , , , , , , , Spain; , , , Sweden; , , , , , , , , , , , Switzerland; , , Taiwan; , , , , , , M Thailand; 17812, 19360, 19570, United Kingdom; , , , , , , , , , , , , , , , , USA; , , , , , , , , , , , , , , ,

SL1200 (GeoHelix P2) Passive GPS Antenna Product Specifi cation

SL1200 (GeoHelix P2) Passive GPS Antenna Product Specifi cation Product Description Built on patented PowerHelix fi ltering antenna technology, the SL1200 GPS antenna provides high performance in diffi