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4.5 Inverted-F Antenna

The BRD4154A Radio Board includes an on-board printed Inverted-F Antenna tuned for the 2.4 GHz band. Due to the design restric-
tions of the Radio Board the input of the antenna and the output of the matching network can't be placed directly next to each other thus
a 50 Ohm transmission line was necessary to connect them. The resulting impedance and reflection measured at the output of the
matcing network are shown in the following figure. As it can be observed the impedance is close to 50 Ohm (the reflection is better than
-10 dB) for the entire 2.4 GHz band.

Figure 4.2. Impedance and Reflection of the Inverted-F Antenna of the BRD4154A

BRD4154A Reference Manual

RF Section

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Summary of Contents for BRD4154A

Page 1: ...icon Labs energy friendly 32 bit MCUs combined with the low transmit and receive power consumption of the 2 4 GHz radio result in a solution optimized for battery powered applications RADIO BOARD FEATURES Wireless SoC EFR32MG1P732F256GM32 CPU core ARM Cortex M4 with FPU Flash memory 256 kB 512 kB RAM 32 kB Operation frequency 2 4 GHz Transmit power 19 5 dBm Integrated PCB antenna UFL connector opt...

Page 2: ...ard is designed to the operate in the 2400 2483 5 MHz band with the RF matching network optimized to oper ate with 19 5 dBm output power To develop and or evaluate the EFR32 Mighty Gecko the BRD4154A Radio Board can be connected to the Wireless Starter Kit Main board to get access to display buttons and additional features from Expansion Boards and also to evaluate the performance of the RF interf...

Page 3: ... 1 VCOM_ENABLE F3 NC F1 PF0 DEBUG TCK_SWCLK P45 NC P43 NC P41 NC P39 NC P37 P1 0 SENSOR_ENABLE F11 P1 6 UIF_LED1 F13 PD15 P0 1 UIF_BUTTON1 F15 PB11 COM CTS_SCLK DISP_SCLK F17 PD13 VCOM RTS_CS DISP_SCS F19 PB13 PTI_FRAME F21 NC GND VMCU_IN P0 6 PF3 P0 P201 Lower Row NC P2 UIF_BUTTON0 PD14 P4 UIF_BUTTON1 PD15 P6 GND VRF_IN P35 IOEXP_DBG_C2CK P7 PD13 VCOM RTS_CS DISP_SCS P5 PB11 VCOM CTS_SCLK DISP_SC...

Page 4: ... an EFR32MG1P732F256GM32 Wireless System on Chip featuring 32 bit Cortex M4 with FPU core 256 kB 512 kB of flash memory and 32 kB of RAM and a 2 4 GHz band transceiver with output power up to 19 5 dBm For additional information on the EFR32MG1P732F256GM32 refer to the EFR32MG1 Data Sheet 3 3 2 LF Crystal Oscillator LFXO The BRD4154A Radio Board has a 32 768 kHz crystal mounted 3 3 3 HF Crystal Osc...

Page 5: ...ts through the UFL connector the series component to the antenna should be removed and the 0 Ohm resistor should be mounted see Chapter 4 2 Schematic of the RF Matching Network for further details 3 3 7 Radio Board Connectors Two dual row 0 05 pitch polarized connectors make up the BRD4154A Radio Board interface to the Wireless Starter Kit Mainboard For more information on the pin mapping between ...

Page 6: ...154A board is 19 5 dBm thus the RF output of the IC is connected to the antenna through a four element impedance matching and harmonic filter circuitry For conducted measurements the output of the matching network can also be connected to the UFL connector by relocating the series R1 resistor 0 Ohm to the R2 resistor position between the output of the matching and the UFL connector 4 3 RF Section ...

Page 7: ...h other thus a 50 Ohm transmission line was necessary to connect them The resulting impedance and reflection measured at the output of the matcing network are shown in the following figure As it can be observed the impedance is close to 50 Ohm the reflection is better than 10 dB for the entire 2 4 GHz band Figure 4 2 Impedance and Reflection of the Inverted F Antenna of the BRD4154A BRD4154A Refer...

Page 8: ...mm 30 mm DC DC Inductor DC DC Supply Filter Caps PAVDD Supply Filtering Figure 5 1 BRD4154A Top View 24 mm 27 3 mm 28 6 mm 5 mm Interface Connector Interface Connector 15 mm Board Identification Display Enable Selection Figure 5 2 BRD4154A Bottom View BRD4154A Reference Manual Mechanical Details silabs com Smart Connected Energy friendly Rev 1 0 7 ...

Page 9: ...bove 1 GHz FCC 15 35 allows duty cycle relaxation to the regulatory limits For the EmberZNet PRO the relaxation is 3 6 dB So practically the 41 2 dBm limit can be modified to 37 6 dBm In case of operating in the 2400 2483 5 MHz band the 2nd 3rd and 5th harmonics can fall into restricted bands so for those the 37 6 dBm limit should be applied For the 4th harmonic the 20 dBc limit should be applied ...

Page 10: ...or details see the schematic of the BRD4154A The transceiver was operated in continuous carrier transmission mode The output power of the radio was set to 19 5 dBm The typical output spectrum is shown in the following figure Figure 7 1 Typical Output Spectrum of the BRD4154A As it can be observed the fundamental is slightly lower than 19 5 dBm and the strongest unwanted emission is the double freq...

Page 11: ...ntenna the on board printed Inverted F antenna of the BRD4154A board was used the R1 resistor 0 Ohm was mounted The supply for the radio RFVDD was 1 8 V provided by the on chip DC DC converter the supply for the power amplifier PAVDD was 3 3 V provided by the Motherboard for details see the schematic of the BRD4154A The transceiver was operated in continuous carrier transmission mode The output po...

Page 12: ...ent The harmonic emissions are under the 30 dBm limit with margin Although the BRD4154A Radio Board has an option for mounting a shielding can that is not required for the compli ance 8 2 Recommendations for 2 4 GHz FCC 15 247 compliance As it was shown in the previous chapter the radiated power of the fundamental of the BRD4154A EFR32 Mighty Gecko Radio Board complies with the 30 dBm limit of the...

Page 13: ...ory Table 9 1 Document Revision History Revision Number Effective Date Change Description 1 0 06 05 2016 Initial release BRD4154A Reference Manual Revision History silabs com Smart Connected Energy friendly Rev 1 0 12 ...

Page 14: ... jumpers and pulled buttons in to IO expander Updated EFR32 part number Note The silkscreen marking on the board e g PCBxxxx A00 denotes the revision of the PCB The revision of the actual Radio Board can be read from the on board EEPROM BRD4154A Reference Manual Board Revisions silabs com Smart Connected Energy friendly Rev 1 0 13 ...

Page 15: ... 2 4 GHz RF Matching 5 4 3 RF Section Power Supply 5 4 4 Bill of Materials for the 2 4 GHz Matching 5 4 5 Inverted F Antenna 6 5 Mechanical Details 7 6 EMC Compliance 8 6 1 Introduction 8 6 2 EMC Regulations for 2 4 GHz 8 6 2 1 ETSI EN 300 328 Emission Limits for the 2400 2483 5 MHz Band 8 6 2 2 FCC15 247 Emission Limits for the 2400 2483 5 MHz Band 8 6 2 3 Applied Emission Limits for the 2 4 GHz ...

Page 16: ...9 Revision History 12 10 Board Revisions 13 Table of Contents 14 Table of Contents 15 ...

Page 17: ...not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Laboratories A Life Support System is any product or system intended to support or sustain life and or health which if it fails can be reasonably expected to res...

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