2450AT42E010B001E

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

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2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B<br>This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.<br>Detail Specification: 10/28/2021 Page 1 of 9<br>General Specifications<br>Part Number 2450AT42E010B Yy<br>Frequency (MHz) 2400 - 2480 | %<br>EVB1* EVB2*<br>Return Loss (dB)<br>2.7 min. 3.5 min.<br>:<br>Peak Gain (dBi typ.) -1.0  (YZ-V) -1.0  (YZ-V)<br>Average Gain (dBi typ.) -3.5 (YZ-V) -5.0  (YZ-V)<br>Impedance (Ω) 50 Antenna mounts<br>directly above or<br>Power Capacity (W) 2 max. (CW)<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>Recommended Storage  +5 to +35°C ever again!<br>Conditions and Period for  Humidity 45 - 75% RH<br>unused Product on T&R 18 months max.<br>== *Evaluation boards 1 and 2 are meant to demonstrate the difference in performance achievable with different substrate thicknesses. So<br>**----- End of picture text -----**<br>


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. 

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

Bulk (loose pcs.) Suffix = S E.g. 2450AT42E010BS **Packing Style** T & R Suffix = E E.g. 2450AT42E010BE **Evaluation Board 1** 2450AT42E010B-EB1SMA (comes with 1 female SMA connector) **Evaluation Board 2** 2450AT42E010B-EB2SMA (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>FI 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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

_**High Frequency Ceramic Solutions**_ **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 2 of 9 

## **Mounting Consideration 1: Evaluation Board 1 (Thickness = 1.5mm)** 

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Top View Bottom View<br>3mm<br>Ground<br>6.26mm<br>«@* 12 Se<br>Matching circuit<br>30mm my -f- oo<br>50 Ω  Feed Line<br>Ground Plane (where other SMD<br>components will be mounted)<br>p/n: 2450AT42E010B-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.<br>0.3mm<br>  0.6mm<br>1.0mm 3mm<br>/ \ I Fiennes 1<br>*   0.6mm<br>1.5 nH<br>0.5mm<br>6.26mm<br>Matching circuit Floating pad<br>**----- End of picture text -----**<br>


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*<br>Line width should be designed to match 50ohm characteristic impedance, depending on PCB material and<br>thickness.  A coplanar waveguide trace is recommended for best results.<br>For this particular antenna It is recommended that the designer leave available slots for the matching network, even<br>if all slots won't be used, this will prepare the PCB for the unpredictable final mass production version of the<br>matching circuit. The antenna matching network values above are used when antenna is mounted on Johanson's<br>evaluation board. The matching values on client’s PCB will be different.<br>**----- End of picture text -----**<br>


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: 2450AT42E010B-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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B** 

**This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 3 of 9 

## **Mounting Consideration 1: Evaluation Board 2 (Thickness = 2.5mm)** 

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Top View Bottom View<br>3mm<br>Ground<br>6.26mm<br>30mm Matching circuit<br>50 Ω  Feed Line<br>Ground Plane (where other SMD<br>components will be mounted)<br>p/n: 2450AT42E010B-EB2SMA<br>50mm Want the layout file? Send us a message at:<br>_———— https://www.johansontechnology.com/ask-a-question<br>0.13mm<br>Metal bottom GND plane to be placed directly<br>underneath yellow soldemask zone, covering  0.5mm<br>entire area.<br>ee ee<br> <br>eo® @06 1.0 nH 3.6pF 9 iy 6 8.2 pF<br>1.5 nH<br> <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: 2450AT42E010B-EB2SMA** 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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 4 of 9 

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Pe Typical Electrical Characteristics (T=25 °C)<br>Evaluation Board 1 (Antenna Efficiency: 18%@ 2.4GHz ; 38%@2.44GHz ; 21%@2.48GHz)<br>Return Loss 0<br>m 2<br>m 1<br>-5<br>-10<br>-15<br>m3<br>-20<br>-25<br>2.0 2.2 2.4 2.6 2.8 3.0<br>freq, GHz<br>m2 m3 m1<br>freq=2.400GHz freq=2.440GHz freq=2.480GHz<br>es dB(S(1,1))=-2.951 dB(S(1,1))=-19.219 ee dB(S(1,1))=-4.100 eee<br>dB(S(1,1))<br>**----- End of picture text -----**<br>


**Evaluation Board 2 (Antenna Efficiency: 27%@ 2.4GHz ; 42%@2.44GHz ; 27%@2.48GHz)** 

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Return Loss 0<br>- 5 m 95<br>m97<br>-1 0 m96<br>-1 5<br>-2 0<br>-2 5<br>2.0 2.2 2.4 2.6 2.8 3.0<br>freq, GHz<br>m97 m96 m95<br>freq=2.400GHz freq=2.440GHz freq=2.480GHz<br>dB(S(1,1))=-8.572 dB(S(1,1))=-10.958 dB(S(1,1))=-5.426<br>ee |ee |ee<br>dB(S(1,1))<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. 5.1 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<br>**----- End of picture text -----**<br>


**P/N 2450AT42E010B** 

**This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 5 of 9 

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Typical Radiation Patterns @ 2.44GHz (T=25 °C)<br>On<br>Y : Φ(Phi)=90 [o] Evaluation Board 1 Evaluation Board 2<br>peo<br>XY-plane @2440MHz<br>ee Sao a<br>X : Φ(Phi)=0 [o]<br>Z :  θ(Theta)=0 [o]<br>XZ-plane @2440MHz<br>YZ-plane @2440MHz<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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

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

**P/N 2450AT42E010B** 

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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 6 of 9<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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 7 of 9 

## ~~a~~ **Wider Tuning Example** 

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By re-tuning  our Evaluation Board 1, return loss can be improved over the bandwidth as a whole.<br>An additional tuning element is placed between antenna pin 3 and GND.<br>0.13mm<br>0.5mm<br> <br>2.2 pF 1.0 nH 30 pF<br>eo fee e | 6<br>1.5 nH<br> <br>‘ 1.5 pF 7 ae = ><br>.f/ x Jims<br>opvaeeteee Matching circuits Floating pad<br>(Antenna Efficiency: 22%@ 2.4GHz ; 31%@2.44GHz ; 20%@2.48GHz)<br>Return Loss 0<br>-5<br>m1 m3<br>m2<br>-10<br>-15<br>-20<br>-25<br>2.0 2.2 2.4 2.6 2.8 3.0<br>freq, GHz<br>m1 m2 m3<br>freq=2.400GHz freq=2.440GHz freq=2.480GHz<br>dB(S(1,1))=-7.785 dB(S(1,1))=-10.579 dB(S(1,1))=-8.225<br>dB(S(1,1))<br>**----- End of picture text -----**<br>


Note: This only serves as an example and is not an order-able evaluation board. 

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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 8 of 9 

## **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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved 

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

> **2.4 GHz SMD, Above Metal, Low Profile Mini Chip Antenna P/N 2450AT42E010B This antenna will generally have a metal layer directly underneath for proper operation, exceptions may apply.** Detail Specification: 10/28/2021 Page 9 of 9 

**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~~ http://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. 5.1 2021 Johanson Technology, Inc.  All Rights Reserved