2BTK2-B253M-CYE-V1OFFICIAL LIGHT STICK

YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Dec 12, 2025 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 In re : YG PLUS, INC. FCC Application for FCC ID : 2BTK2-B253M-CYE-V1 To whom it may concern: We, the undersigned, hereby attest to the fact that we will apply the Supplier’s Declaration of Conformity procedure to the class B computer peripheral portion of this composite filing. We hereby certify that the Supplier's conformity declaration procedure will be applied to the NFC receiving antenna of this composite document. Sincerely, KWAK JUNG KEUN / Director YG PLUS, INC.

Rev 1/26/2023 Company: YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 09-12-2025 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2BTK2-B253M-CYE-V1 [YG PLUS, INC.] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. [YG PLUS, INC.] (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Device is inherently compliant based on hardware limitations or software controls. or A Software Bill of Materials (SBOM) is provided to the TCB for review, and The end-user or third parties cannot install additional software on this device. Sincerely, KWAK JUNG KEUN / Director YG PLUS, INC. Rev 1/26/2023 Company: YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 09-12-2025 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2BTK2-B253M-CYE-V1 [YG PLUS, INC.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, KWAK JUNG KEUN / Director YG PLUS, INC.

Rev 1/26/2023 Company: YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Zip code: 07326 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 11-12-2025 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID or Grantee Code: [2BTK2-B253M-CYE-V1] Applicant FRN: [0037726742] [YG PLUS, INC.] Certifies that, as of the date of the filing of the application, [FCC US Agent, LLC] is our designated U.S. agent for service of process for the above referenced FCC ID. [YG PLUS, INC.] accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. [FCC US Agent, LLC] accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information: Name: [FCC US Agent, LLC] FRN (If the U.S. agent has an FRN): [0033402884] Address: [3722 Illinois Avenue, Saint Charles, IL, 60174, USA] Contact Person: [Tim Payne] Tel.: [708-571-3148] Email: [[email protected]] Sincerely, YG PLUS, INC. FCC US Agent, LLC KWAK JUNG KEUN Tim Payne [Insert Applicant signature] [U.S. Agent signature]

YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo- gu, Seoul, South Korea Dec 12, 2025 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 In re : YG PLUS, INC. FCC ID : 2BTK2-B253M-CYE-V1 Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules (CFR 47), YG PLUS, INC. hereby requests confidentiality and treatment of certain information accompanying this application. The materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the Applicant and provide unjustified benefits to its competitors. We are also hereby request Short-Term Confidentiality for 180 days after the grant as outlined in Public Notice DA 04-1705. This provision will give YG PLUS, INC. commporary confidentiality of commercially sensitive information prior to product release. The requested Confidential and Temporary Confidential exhibits are listed as follows: Exhibit Type File Name CONFIDENTIAL Schematics CONF APPENDIX 2BTK2-B253M-CYE-V1 SCH.pdf Parts list CONF APPENDIX 2BTK2-B253M-CYE-V1 PL.pdf Block diagram CONF APPENDIX 2BTK2-B253M-CYE-V1 BLK DIA.pdf Operational description CONF APPENDIX 2BTK2-B253M-CYE-V1 OpDes.pdf SHORT-TERM CONFIDENTIAL External Photos SHORT-TERM CONF 2BTK2-B253M-CYE-V1 EXT Photo.pdf Internal Photos SHORT-TERM CONF 2BTK2-B253M-CYE-V1 INT Photo.pdf Test-Setup Photos SHORT-TERM CONF 2BTK2-B253M-CYE-V1 Test Photo.pdf User’s Manual SHORT-TERM CONF 2BTK2-B253M-CYE-V1 Manual.pdf The Applicant understands that pursuant to Rule 0.457, disclosure of this application and all accompanying documentations, where applicable, will not be made public before the date of the Grant for this application. Sincerely, KWAK JUNG KEUN / Director YG PLUS, INC.

YG PLUS, INC. Add: 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Dec 12, 2025 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 LETTER OF AUTHORIZATION To whom it may concern: We, the undersigned, hereby authorize LTA Co., Ltd., to act on our behalf in all manners relating to application for equipment authorization for FCC ID: 2BTK2-B253M-CYE-V1 including signing of all documents relating to these matters. Any and all acts carried out by LTA Co., Ltd., on our behalf shall have the same affect as acts of our own. This authorization is valid until further written notice from YG PLUS, INC. LTA Co.,LTD. (Contact Person) Contact name: Eun-Hwan Jung Position: Manager Phone:(82)31-323-6008 E-mail: [email protected] Sincerely, KWAK JUNG KEUN / Director YG PLUS, INC.

FCC ID: 2BTK2-B253M-CYE-V1 Copyright Ⓒ 2025, LTA Co., Ltd. SAMPLE LABEL & LOCATION YG PLUS, INC. Model : CLOSE YOUR EYES OFFICIAL LIGHT STICK FCC ID : 2BTK2-B253M-CYE-V1 Manufacturer : HUIZHOU DELI INDUSTRY CO., LTD. Made in China

Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 1 of 7 243 Jubug-Ri,Yangji-Myeon, Yongin-Si, Gyeonggi-Do, Korea 17159 Tel: +82-31-323-6008 Fax: +82-31-323-6010 http://www.ltalab.com Dates of Tests: Nov 05, 2025 ~ Dec 08,2025 Test Report S/N: LR500112512F Test Site : LTA CO., LTD. CERTIFICATION OF COMPLIANCE FCC ID. APPLICANT Equipment Class : Digital Transmission System (DTS) Manufacturing Description : OFFICIAL LIGHT STICK Manufacturer : HUIZHOU DELI INDUSTRY CO., LTD. Model name : CLOSE YOUR EYES OFFICIAL LIGHT STICK Variant Model name : - Test Device Serial No.: : Identical prototype Rule Part(s) : FCC Part 15.247 Subpart C ; ANSI C63.10 - 2020 Frequency Range : 2402 ~ 2480 MHz BLE Max. Output Power : Max -2.27 dBm - Conducted Data of issue : Dec 12 ,2025 This test report is issued under the authority of: The test was supervised by: Eun-Hwan Jung, Manager In-Sun Lee, Test Engineer 2BTK2-B253M-CYE-V1 YG PLUS, INC. Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 2 of 7 Revision history Revision Date of issue Description Revised by -- Dec 12 ,2025 Initial - TABLE OF CONTENTS 1. GENERAL INFORMATION --------------------------------------------------------------------------- 2. INFORMATION ABOUT TEST ITEM --------------------------------------------------------------- 3. TEST REPORT ------------------------------------------------------------------------------------------- 3.1 SUMMARY OF TESTS ----------------------------------------------------------------------------- 3.2 RF EXPOSURE EVULATION------------------------------------------------------------------------- 3 4 5 5 6 Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 3 of 7 1. General information 1-1 Test Performed Company name : LTA Co., Ltd. Address : 243, Jubug-ri,Yangji-Myeon,Youngin-Si, Kyunggi-Do, Korea. 449-822 Web site : http://www.ltalab.com E-mail : [email protected] Telephone : +82-31-323-6008 Facsimile : +82-31-323-6010 Quality control in the testing laboratory is implemented as per ISO/IEC 17025 which is the “General requirements for the competents of calibration and testing laboratory”. 1-2 Accredited agencies LTA Co., Ltd. is approved to perform EMC testing by the following agencies: Agency Country Accreditation No. Validity Reference RRA KOREA KR0049 - EMC accredited Lab. FCC U.S.A 649054 2027-02-27 FCC CAB VCCI JAPAN C-14948 2026-09-10 VCCI registration VCCI JAPAN T-12416 2026-09-10 VCCI registration VCCI JAPAN R-14483 2026-10-15 VCCI registration VCCI JAPAN G-10847 2027-12-13 VCCI registration IC CANADA 5799A-1 2026-08-05 IC filing Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 4 of 7 2. Information about test item 2-1 Client & Manufacturer Client Company name : YG PLUS, INC. Address : 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Tel / Fax : +82-10-8942-7990 / +82-70-4405-2111 Manufacturer HUIZHOU DELI INDUSTRY CO., LTD. Address NO.13, NO. 6, SONGSHAN INDUSTRIAL ZONE, ZHONGKAI HIGH-TECH DEVELOPMENT ZONE, HUICHENG DISTRICT, HUIZHOU CITY, GUANGDONG, CHINA Tel / Fax +86 752 2508123 / +86 752 2511196 2-2 Equipment Under Test (EUT) Model name : CLOSE YOUR EYES OFFICIAL LIGHT STICK Serial number : Identical prototype Date of receipt : Nov 05, 2025 EUT condition : Pre-production, not damaged Antenna type : Pattern Antenna (Gain : 2.1 dBi) Frequency Range : 2402 ~ 2480 MHz RF output power : Max -2.27 dBm – Conducted Type of Modulation : GFSK Power Source : DC 4.5 V *This product includes a voltage regulation circuit, and the testing was conducted at DC 4.5 V among the available supply voltages of DC 4.5 V and DC 5 V 2-3 Tested frequency Bluetooth LOW MID HIGH Frequency (MHz) 2402 2440 2480 2-4 Ancillary Equipment Equipment Model No. Serial No. Manufacturer Notebook - MS-1736 MSI Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 5 of 7 3. Test Report 3.1 Summary of tests FCC Part Section(s) Parameter Limit Test Condition Status (note 1) §1.1310 and §2.1091 RF EXPOSURE EVULATION - - C Note 1: C=Complies NC=Not Complies NT=Not Tested NA=Not Applicable - Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 6 of 7 3.2 RF EXPOSURE EVULATION 1.1 Limit According to §1.1310 and §2.1091 RF exposure is calculated. (B) Limits for General Population/Uncontrolled Exposures Frequency range (MHz) Electric field Strength (V/m) Magnetic field Strength (A/m) Power density (mW/cm²) Averaging time (minutes) 1.34 - 30....................................... 824/f 2.19/f *(180/ f²) 30 30 - 300....................................... 27.5 0.073 0.2 30 300 - 1500.................................... ............... ............... f/1500 30 1500 - 100.000................................. ............... ............... 1.0 30 F = frequency in MHz * = Plane-wave equivalent power density 1.2 MAXIMUM PERMISSIBLE EXPOSURE Prediction Prediction of MPE limit at a given distance Power density at the specific separation: S = PG/(4R 2 π) Where, S = Maximum power density (mW/cm 2 ) P = Power input to the antenna (mW) G = Numeric power gain of the antenna R = Distance to the center of the radiation of the antenna (20 cm = limit for MPE) S = (0.59 * 1.62) / (4 * 5 2 * π) S = 0.000 2 mW/cm 2 Ref. No.: LR500112512F LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 7 of 7 1.3 MAXIMUM PERMISSIBLE EXPOSURE Prediction - Calculated under the worst-case conditions of each mode. (Measured power 3 dBm ± 0.5dB) 2.4GHz Mode SAR Test exclusion thresholds for 100MHz to 6GHz at test separation distance ≤ 5 mm = Used [(max.power of channel, including tune-up torelance, mW)/(min. test separation distance, mm)] * [√f(GHz)] = [0.59 / 5 ] * [ √2.402 ] = 0.078 ≤ 3.0, for 1g SAR Thus, SAR for this device is not required. Max Peak output Power at antenna input terminal -2.27 dBm Max Peak output Power at antenna input terminal 0.59 mW Prediction distance 5 mm Prediction frequency 2402 MHz Antenna Gain(typical) 2.1 dBi Antenn…

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Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 1 of 30 243 Jubug-Ri,Yangji-Myeon, Yongin-Si, Gyeonggi-Do, Korea 17159 Tel: +82-31-323-6008 Fax: +82-31-323-6010 http://www.ltalab.com Dates of Tests: Nov 05, 2025 ~ Dec 08,2025 Test Report S/N: LR500112512E Test Site : LTA CO., LTD. CERTIFICATION OF COMPLIANCE FCC ID. APPLICANT Equipment Class : Digital Transmission System (DTS) Manufacturing Description : OFFICIAL LIGHT STICK Manufacturer : HUIZHOU DELI INDUSTRY CO., LTD. Model name : CLOSE YOUR EYES OFFICIAL LIGHT STICK Variant Model name : - Test Device Serial No.: : Identical prototype Rule Part(s) : FCC Part 15.247 Subpart C ; ANSI C63.10 - 2020 Frequency Range : 2402 ~ 2480 MHz BLE Max. Output Power : Max -2.27 dBm - Conducted Data of issue : Dec 12 ,2025 This test report is issued under the authority of: The test was supervised by: Eun-Hwan Jung, Manager In-Sun Lee, Test Engineer 2BTK2-B253M-CYE-V1 YG PLUS, INC. Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 2 of 30 Revision history Revision Date of issue Description Revised by -- Dec 12 ,2025 Initial - TABLE OF CONTENTS 1. GENERAL INFORMATION -------------------------------------------------------------------------- 2. INFORMATION ABOUT TEST ITEM ------------------------------------------------------------- 3. TEST REPORT ------------------------------------------------------------------------------------------ 3.1 SUMMARY OF TESTS ---------------------------------------------------------------------------- 3.2 TECHNICAL CHARACTERISTICS TEST ---------------------------------------------------- 3.2.1 6 dB BANDWIDTH -------------------------------------------------------------------------- 3.2.2 PEAK OUTPUT POWER -------------------------------------------------------------------- 3.2.3 POWER SPECTRAL DENSITY ------------------------------------------------------------ 3.2.4 BAND EDGE ---------------------------------------------------------------------------------- 3.2.5 CONDUCTED SPURIOUS EMISSIONS ------------------------------------------------- 3.2.6 RADIATED SPURIOUS EMISSIONS ---------------------------------------------------- 3.2.7 AC CONDUCTED EMISSIONS ----------------------------------------------------------- APPENDIX APPENDIX TEST EQUIPMENT USED FOR TESTS -------------------------------------------- 3 4 5 5 6 6 8 10 12 14 16 28 29 Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 3 of 30 1. General information 1-1 Test Performed Company name : LTA Co., Ltd. Address : 243, Jubug-ri,Yangji-Myeon,Youngin-Si, Kyunggi-Do, Korea. 17159 Web site : http://www.ltalab.com E-mail : [email protected] Telephone : +82-31-323-6008 Facsimile +82-31-323-6010 Quality control in the testing laboratory is implemented as per ISO/IEC 17025 which is the “General requirements for the competents of calibration and testing laboratory”. 1-2 Accredited agencies LTA Co., Ltd. is approved to perform EMC testing by the following agencies: Agency Country Accreditation No. Validity Reference RRA KOREA KR0049 - EMC accredited Lab. FCC U.S.A 649054 2027-02-27 FCC CAB VCCI JAPAN C-14948 2026-09-10 VCCI registration VCCI JAPAN T-12416 2026-09-10 VCCI registration VCCI JAPAN R-14483 2026-10-15 VCCI registration VCCI JAPAN G-10847 2027-12-13 VCCI registration IC CANADA 5799A-1 2026-08-05 IC filing Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 4 of 30 2. Information about test item 2-1 Client & Manufacturer Client Company name : YG PLUS, INC. Address : 19F, Three IFC, 10, Gukjegeumyung-ro, Yeongdeungpo-gu, Seoul, South Korea Tel / Fax : +82-10-8942-7990 / +82-70-4405-2111 Manufacturer HUIZHOU DELI INDUSTRY CO., LTD. Address NO.13, NO. 6, SONGSHAN INDUSTRIAL ZONE, ZHONGKAI HIGH-TECH DEVELOPMENT ZONE, HUICHENG DISTRICT, HUIZHOU CITY, GUANGDONG, CHINA Tel / Fax +86 752 2508123 / +86 752 2511196 2-2 Equipment Under Test (EUT) Model name : CLOSE YOUR EYES OFFICIAL LIGHT STICK Serial number : Identical prototype Date of receipt : Nov 05, 2025 EUT condition : Pre-production, not damaged Antenna type : Pattern Antenna (Gain : 2.1 dBi) Frequency Range : 2402 ~ 2480 MHz RF output power : Max -2.27 dBm – Conducted Type of Modulation : GFSK Power Source : DC 4.5 V *This product includes a voltage regulation circuit, and the testing was conducted at DC 4.5 V among the available supply voltages of DC 4.5 V and DC 5 V 2-3 Tested frequency LOW MID HIGH Frequency (MHz) 2402 2440 2480 2-4 Ancillary Equipment Equipment Model No. Serial No. Manufacturer Notebook - MS-1736 MSI Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 5 of 30 3. Test Report 3.1 Summary of tests FCC Part Section(s) Parameter Test Condition Status (note 1) 15.247(a) 6 dB Bandwidth Conducted C 15.247(b) Transmitter Peak Output Power C 15.247(e) Transmitter Power Spectral Density C 15.247(d) Band Edge & Conducted Spurious emission C 15.209 Transmitter emission Radiated C 15.207 AC Conducted Emissions Conducted N/A 15.203 Antenna requirement - C N/A : This product is only operated with DC voltage. The above equipment was tested by LTA Co., Ltd. The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10-2020 and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2 and Part 15.247 The test results of this report relate only to the tested sample identified in this report. The tests were performed according to the method of measurements prescribed in KDB No.558074. → Antenna Requirement YG PLUS, INC. FCC ID: 2BTK2-B253M-CYE-V1 unit complies with the requirement of §15.203. The antenna type is Pattern Antenna Ref. No.: LR500112512E LP19-080(0) Copyright © 2025, LTA Co., Ltd. Page 6 of 30 3.2 Technical Characteristics Test 3.2.1 6 dB Bandwidth Procedure: The bandwidth at 6 dB below the highest in-band spectral density wa…

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AN1088: Designing with an Inverted-F 2.4 GHz PCB Antenna This document describes an Inverted-F 2.4 GHz PCB antenna designed by Silicon Labs for use with 2.4 GHz wireless chipset designs. The Inverted-F antenna is one of the more commonly used antennas at 2.4 GHz. Silicon Labs provides antenna dimen- sions in two different substrate thicknesses. PCB antennas are board specific, so you may need to modify the antenna dimen- sions for your board implementation. KEY POINTS • Reference design layout • Antenna placement and tuning • Factors affecting antenna performance silabs.com | Building a more connected world.Rev. 0.1 1. Overview One of the main reasons to use a PCB antenna is to reduce cost. Since the antennas are printed directly on the board, they are gener- ally considered to be free. On boards with room to spare, this will be true. On boards that need to grow to account for the increased size of the printed antenna, you must include the added cost of the larger PCB when calculating cost savings. Well-implemented PCB antennas will have similar performance to that of a ceramic antenna. Silicon Labs has released the following Inverted-F based Reference Designs: • EM358x USB Ceramic Balun with Inverted-F PCB Antenna Reference • EM35xx 2-layer Reference Design with Ceramic Balun and Spiral Inverted-F PCB Antenna • EFR32MG, EFR32BG, and EFR32FG 2.4 GHz radio board designs Note: The details included in this application note are based on four legacy 2.4 GHz designs. All of the details contained within this document are applicable to EM3x and EFR32 2.4 GHz designs. The four legacy 2.4 GHz designs used to collect the data contained in this document were: • EM250 4-Layer Design, Inverted-F Antenna, 0.062′′ thick (EM250_REF_DES_LC_LAT_INV-F_62mil.zip) • EM250 4-Layer Design, Inverted-F Antenna, 0.8mm thick (EM250_REF_DES_LC_LAT_INV-F_0.8mm.zip) • EM260 4-Layer Design, Inverted-F Antenna, 0.062′′ thick (EM260_REF_DES_LC_LAT_INV-F_62mil.zip) • EM260 4-Layer Design, Inverted-F Antenna, 0.8mm thick (EM260_REF_DES_LC_LAT_INV-F_0.8mm.zip) AN1088: Designing with an Inverted-F 2.4 GHz PCB Antenna Overview silabs.com | Building a more connected world.Rev. 0.1 | 2 2. Layout PCB antennas are very layout sensitive. For best performance, Silicon Labs recommends following the reference design layouts as closely as possible. 2.1 Key Features Some key features of the design include the following: • There are two versions of the layout: for the 62 mil and 0.8 mm board thicknesses • Feed arm should be fed with a 50 ohm microstrip transmission line (14 mils for an 0.008′′ top layer) • Shorting arm must be shorted to the ground plane, preferably with ground vias • There should be no ground plane under the antenna • Ground plane on layers 2 and 4, with stitching vias along the ground edge (however, EFR32 radio boards use ground planes on each layers, where possible) • The antenna was designed to have a 40 mil clearance between the shorting arm and the board edge, and a 20 mil clearance be- tween the board edge and the antenna trace • The antenna should be covered with soldermask • Simulations have shown no benefit to increasing the width of the shorting arm or mitering the bend in the shorting arm The following figure illustrates the dimensions of the antenna. Figure 2.1. Antenna Dimensions Note: You may need to modify dimensions for your board’s implementation. AN1088: Designing with an Inverted-F 2.4 GHz PCB Antenna Layout silabs.com | Building a more connected world.Rev. 0.1 | 3 2.1.1 Board Stackup The following figure shows the board stackups used in the designs. Figure 2.2. Board Stackup AN1088: Designing with an Inverted-F 2.4 GHz PCB Antenna Layout silabs.com | Building a more connected world.Rev. 0.1 | 4 3. Tuning and Antenna 3.1 Antenna Placement Silicon Labs designed and optimized the Inverted-F reference designs for a 1′′-wide PCB board. The ground plane forms an important part of the antenna. The following figure shows the surface currents around the antenna. As you can see, there is significant current running along the ground plane edge. Changing the size of the ground plane will affect performance; most notably, the antenna match will be detuned. For boards that vary in size from the reference design, Silicon Labs recommends the placement shown in the following figure. Figure 3.1. Surface Current Figure 3.2. Recommended Antenna Placement AN1088: Designing with an Inverted-F 2.4 GHz PCB Antenna Tuning and Antenna silabs.com | Building a more connected world.Rev. 0.1 | 5 3.2 Tuning Silicon Labs designed the printed antenna to provide a 50-Ohm output. An inverted-F antenna can inherently be matched to 50 ohms without using any external tuning component. However, board size, plastic enclosures, metal shielding, and components in close prox- imity to the antenna can affect antenna performance. For best performance, the antenna might require tuning that can be realized by two ways: • Dimension changes in the antenna layout structure, or • Applying external tuning components. The latter is typically the preferred solution when layout modification is not required on a custom design. To accomplish this, Silicon Labs generally recommends reserving SMD placeholders for external antenna tuning components, where the suggested external an- tenna matching structure is a 3-element PI network. You can achieve a good match using a maximum of two elements (with one series and one shunt component) of the PI network. Any unknown passive impedance can get matched to 50 ohms on this PI network, since all L, C, L-C, C-L combinations can be realized on it and therefore any de-tuning effect can be compensated out. The following figure shows the values of L required for the reference design prototypes. All four designs required C1/C2 to be unpopula- ted. Note that every implementation of the antenna design will require different combinations of inductors and capacitors. The EM260 0.8mm reference design has the printed inverted-F…

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