2450AT42E0100001E

## _**High Frequency Ceramic Solutions**_ 

**2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna** 

**P/N 2450AT42E0100** 

**This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** 

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Detail Specification: 10/28/2021 Page 1 of 8<br>General Specifications<br>Part Number 2450AT42E0100<br>Frequency (MHz) 2400 - 2480<br>Peak Gain (dBi typ.) -2.0 (YZ-V)<br>Average Gain (dBi typ.) -5.0 (YZ-V)<br>Return Loss (dB) 5.6 typ. (4.5 min.) | :<br>Impedance (Ω) 50 Antenna mounts<br>Power Capacity (W) 2 max. (CW) directly above or<br>below the metal layer<br>Reel Quantity (pcs./reel) 2,000  of PCB. No antenna<br>Operating Temp -40 to +85°C clearance required<br>+5°C to +35°C ever again!<br>Recommended Storage  a CO <<br>Conditions and Period for  Humidity 45 - 75% RH<br>unused Product on T&R 18 months max.<br>== Wp,<br>**----- End of picture text -----**<br>


Total average radiated efficiency on PCB feature on "Mounting Considerations 1" ( orderable EVB p/n: 2450AT42E0100-EB1SMA) is ~30% 

This antenna was designed in mind for small coin cell, wearable, IoT, 2.4 BLE, 802.11, ISM, Zigbee, etc. applications in close-range networks where metal or a battery/display covers the entire length or side of the PCB or encasement must be present directly under the antenna and there's no room for usual/typical antenna metal clearance. 

## **This antenna is specifically designed for PCBs that have 0.5-1mm of total thickness** 

**Part Number Explanation Packing Style P/N Suffix** 

Bulk (loose pcs.) Suffix = S E.g. 2450AT42E0100S **Packing Style** T & R Suffix = E E.g. 2450AT42E0100E **Evaluation Board** 2450AT42E0100-EB1SMA (comes with 1 female SMA connector) 

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SO Mechanical Specifications Terminal Configuration<br>In mm 1 Feeding Point<br>eS ep<br>L 0.197 ± 0.008 5.00 ± 0.20 2 NC [1]<br>Oe fs<br>W 0.079 ± 0.008 2.00 ± 0.20 W 3 GND<br>Oe fs<br>T 0.059 ± 0.008 1.50 ± 0.20 4 GND<br>Oe es<br>a 0.020 ± 0.008 0.50 ± 0.20 c L<br>Oe  <br>b 0.059 ± 0.008 1.50 ± 0.20 Top View<br>Oe<br>C 0.012 max 0.30 max<br>Oe<br>b<br>b  <br>T<br>a 1Make sure to have Pin 2 soldered<br>Side View Bottom View to its PCB land pad but  not<br>connected to GND or input, it must<br>be NC (or floating).<br>**----- End of picture text -----**<br>


Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 

4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

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2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100<br>This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.<br>Detail Specification: 10/28/2021 Page 2 of 8<br>Mounting Considerations 1<br>Top View Bottom View<br>3mm<br>T e - P s a i iE Ground<br>6.26mm<br>° e C) NV : ; O : :<br>Matching circuit<br>: 30mm "ee . . *.e .<br>50 Ω  Feed Line<br>Ground Plane (where other SMD<br>components will be mounted)<br>p/n: 2450AT42E0100-EB1SMA<br>50mm Want the layout file? Send us a message at:<br>_———— https://www.johansontechnology.com/ask-a-question<br>Metal bottom GND plane to be placed directly<br>underneath yellow soldemask zone, covering  0.63mm 1.5mm 2mm 1.5mm 0.63mm<br>entire area. Nii atptbt 0.3mm<br>  0.6mm<br>3.3 nH<br>1.0mm 3mm<br>2.0 pF<br>*   0.6mm<br>1.5 nH<br>0.5mm<br>6.26mm<br>Matching circuit Floating pad<br>**----- End of picture text -----**<br>


- Line width should be designed to match 50ohm characteristic impedance, depending on PCB material and 

- thickness.  A coplanar waveguide trace is recommended for best results. 

For this particular antenna It is recommended that the designer leave available slots for the matching network, even if all slots won't be used, this will prepare the PCB for the unpredictable final mass production version of the matching circuit. The antenna matching network values above are used when antenna is mounted on Johanson's evaluation board. The matching values on client’s PCB will be different. 

To order a pre-tuned 50Ω EVB with a female SMA connector you see here Click here: https://www.johansontechnology.com/request-a-sample **Reference p/n: 2450AT42E0100-EB1SMA** Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

## **https://www.johansontechnology.com** 

4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100 This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 3 of 8 

## **Typical Electrical Characteristics (T=25 °C)** 

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Return Loss<br>0<br>m122 m123<br>-5<br>-10 m118<br>-15<br>-20<br>2.0 2.2 2.4 2.6 2.8 3.0<br>freq, GHz<br>m122 m118 m123<br>freq=2.400GHz freq=2.440GHz freq=2.480GHz<br>dB(S(1,1))=-5.691 dB(S(1,1))=-11.343 dB(S(1,1))=-5.746<br>dB(S(1,1))<br>**----- End of picture text -----**<br>


The designer should not be highly concerned of the fact that the antenna only demonstrates a -5dB S11 level at the band edges. The antenna has sufficient gain at the band edges to satisfy the applications and uses a high dielectric constant ceramic giving it some detuning resilience to capacitivel loading effects. This antenna is designed for close proximity applications such as the ones mentioned on page 1. 

Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100 This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 4 of 8 

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Typical Radiation Patterns @ 2.44GHz (T=25 °C)<br>XY-plane @2440MHz<br>Y : Φ(Phi)=90° Total<br>o7 i ie<br>; .<br>;<br>/ _ = \<br>-<br>iad i "mm \<br>= — = =p X : Φ(Phi)=0°<br>Va<br>\‘\ Z : 4 —=  θ(Theta)=0 oo ° 772//<br>.<br>- -<br>= el - XZ-plane @2440MHz<br>Total<br>YZ-plane @2440MHz<br>Total<br>**----- End of picture text -----**<br>


Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

**2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna** 

**P/N 2450AT42E0100** 

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This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.<br>Detail Specification: 10/28/2021 Page 5 of 8<br>Mounting Considerations 2 - Circular PCB Environments (coin cell type)<br>Top View<br>0.63mm 1.5mm 2mm 1.5mm 0.63mm<br>0.3mm<br>0.6mm<br>1.0mm<br>° @ e Matching circuit ® ,<br>0.6mm<br>0.5mm<br>50Ω Feed Line<br>radius=22mm<br>(reference only)<br>Ground<br>Receding the GND plane may sound counter-<br>)<br>intuitive, but this helps shape the radiation pattern in<br>31.7mm a more isometric (spherical)  shape. We recommend<br>7mm the designer do this of he/she can afford the reduce<br>SMT space, but not mandated.<br>_ -<br>Bottom View<br>0.3mm<br>" 2? 6.26mm<br>@o -@ .<br>radius=22mm<br>Ground<br>Want the layout file? Send us a message at:<br>. OO https://www.johansontechnology.com/ask-a-question<br>31.7mm<br>7mm<br>**----- End of picture text -----**<br>


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Note: There's no orderable EVB available for the above "Mounting Considerations 2" reference design<br>**----- End of picture text -----**<br>


Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100 This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 6 of 8 

## **Mounting Considerations 3 - Recommendations when using 2450AT42E010B** 

We have found that the best performance can be gained when using the 2450AT42E010 **B** with a 4- layer PCB with a total thickness approximately 1.5mm thick. 

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50mm<br>eo<br>3mm<br>DD E T as<br>Ground<br>. s lhe Matching circuit6.26mm :<br>- sO?<br>30mm<br>; *e :<br>50Ω Feed Line<br>2450AT42E010 B evaluation board ( PN 2450AT42E010B-EB1SMA )<br>**----- End of picture text -----**<br>


Want the layout file? Send us a message at: ———— https://www.johansontechnology.com/ask-a-question 

The 2450AT42E010 **B** 4-layer evaluation board has the following stackup: 

6 mil To order a pre-tuned 50Ω EVB with a female SMA connector, click here: https://www.johansontechnology.com/request-a-sample 41 mil Reference p/n: **2450AT42E010B-EB1SMA** 6 mil 

Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 

4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100 This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 7 of 8 

## **How To Choose The Correct Antenna Variant** 

Since the antenna's efficiency is largely affected by the thickness of the PCB's substrate, we offer another variant of this antenna.  This allows a more robist design to fit your PCB. The disparity between antenna variations are internal only; variations are identical in dimension and footprint-compatible. 

Refer to the diagram below to understand what is meant by substrate thickness. 

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*<br>Substrate Thickness (H)<br>**----- End of picture text -----**<br>


* For PCBs consisting of multiple layers, the thickness (H) is limited distance between the metal layer immediately below the antenna. 

|PCB Substrate Thickness|Recommended JTI PN|
|---|---|
|≤1.0mm|2450AT42E010**0**|
|1.0mm - 2.0mm|2450AT42E010**B**|



## **Typical Efficiency Values @ 2.44GHz for various scenarios for a 30x50mm PCB** 

The following efficiency values represent performance on a 30x50mm EVB like on page 2. Please note that antenna efficiency varies widely with board layout, size and surroundings. 

|**PCB**<br>**Substrate**<br>**Thickness**<br>**(H)**|**Antenna Efficiency @ 2.44GHz**|**Antenna Efficiency @ 2.44GHz**|
|---|---|---|
||**2450AT42E0100**|**2450AT42E010B**|
|H = 0.12 mm|1.95%|1.02%|
|H = 0.7 mm|29.20%|9.30%|
|H = 1.5 mm|23.30%|38.00%|
|H = 2.5 mm|21.60%|42.00%|



Note: "H" substrate thickness of  <0.25mm(10mil) is not recommended. The component will still radiate however not optimally. 

Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 

4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved 

## _**High Frequency Ceramic Solutions**_ 

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E0100 This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 8 of 8 

**Antenna layout review, tuning, and characterization services** ~~eT~~ https://www.johansontechnology.com/ipc-antenna-services **More SMD Chip Antennas at:** ~~ee~~ https://www.johansontechnology.com/antennas **Soldering Information** - ~~ee~~ https://www.johansontechnology.com/ipcsoldering profile **Antenna layout and tuning techniques (How to obtain the new antenna matching values)** ~~ee~~ https://www.johansontechnology.com/tuning **Packaging information** ~~ee~~ https://www.johansontechnology.com/tape-reel-packaging **RoHS Compliance** - ~~EE~~ https://www.johansontechnology.com/rohs compliance **MSL Info** - ~~Ee~~ https://www.johansontechnology.com/msl rating **P/N Explanation and Breakdown** - - ~~Ee~~ https://www.johansontechnology.com/ipc pn explained 

Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 

**https://www.johansontechnology.com** 

4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 4.0 2021 Johanson Technology, Inc.  All Rights Reserved