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Questions tagged [pcb-antenna]

It is an anntenna type which is implemeted on a PCB (printed circuit board) by copper traces.

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Ceramic antennas for power transfer [on hold]

I am working in a magnetic coupling for power transfer between two coils. The other day I come up with the idea of using a ceramic antenna that are pretty small and easy to plug and tune for my ...
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2answers
89 views

Strange shapes on the Wi-Fi module PCB

LG has this Wi-Fi module: This is a 2X2 Dual Band AC Wi-Fi / BT module. You will see two folded WiFi antennas on upper side and one bluetooth PCB trace antenna at the lower right side. I found this ...
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42 views

Tuning antennas

I am working in a biomedical implant. I have to design an antenna for the wireless power transmission. The frequency that I am using is 13.56 MHz. I used some antennas found in some articles but when ...
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19 views

Loop antenna 13.56 MHz Ansys HFSS [on hold]

I am trying to create an antenna in HFSS working for 13.56 MHz. Have any of you work on that or could you provide me some ideas/files for the antenna? Kind regards!
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3answers
93 views

RF loop Antenna design layout

I am designing a bioimplantable circuit for a biomedical implant. The goal is to have an extremely tiny device in a flexible substrate (Dupont Pyralux) that must be powered wirelessly. My problem ...
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28 views

Does feedline of through-hole antennas have to be at the bottom?

Does feedline of through-hole antennas have to be at the bottom of the PCB or is it ok to have it on the top? I don't see why it can't be on the top but I read in Taoglas docs that it should be on the ...
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1answer
66 views

Bigger GPS antenna better or more efficient?

I have the choice between: 1) 35x35mm GPS antenna 71% efficiency glonass, tested on 70x70 GND plane 60% gps 2) 25x25mm GPS antenna 83% GPS, 84% glonass, tested on 50x50 GND plane I have read ...
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2k views

IC on Digikey is 5x more expensive than board containing same IC on Alibaba: How? [closed]

I built a prototype using an NFC board I bought from Alibaba for 1$ (https://www.alibaba.com/showroom/rfid-rc522.html). It claims to use the NXP MFRC522 IC, and if I look on the board the chip has ...
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1answer
64 views

My antenna tuning component values worked on a fresh board previously. Now they're not working. What could be causing this?

This is one of those hardware questions that's making me bang my head against a wall. About six weeks ago I spent a day tuning the NFC antenna on my board. I ended up using ~71pF of shunt capacitance ...
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1answer
135 views

PCB ground connection for shared power/data bus system

I have a wireless device that is connected to a shared power and data bus, similar to below. The bus can be shared by up to 5 devices and I don't know what it will be connected in advance. I connect ...
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41 views

Vertical distance from PCB antenna layer to ground plane?

I know the basic design requirements for pcb trace antenna, no ground place below or above the traces, impedance matching etc. But the design layout recommendations for pcb antenna doesn't seems to ...
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105 views

First PCB project design critique requested (RF) EDITED

This is my first ever RF PCB project and it'd be great to receive some guidance to make this project 'first-time-right'. It's purpose is to transmit and receive signals at two different frequencies: ...
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31 views

Cheap RF 433.92MHz design, PCB track antenna [duplicate]

I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the ...
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1answer
23 views

importance of PCB/Trace antenna position relative to components

This might be a very novice question but I could not find the answer anywhere. When I encounter wireless modules such as the ESP's the trace antenna is always above the shield. Would performance be ...
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27 views

S11 parameter measurements of NFC PCB antenna by VNA

I'm trying to measure the S11 parameter of the NFC PCB antenna (actually PCB coil) by VNA. Desired Smith chart pattern is like the below picture (probably with different values, because of different ...
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44 views

Antenna selection for CC1101-433 MHz rf

I intend to use these TI CC1101 433 MHz RF modules in one of my project: Wavelength of 433 MHz will be 69 cm. Half wavelength will be 34.5 cm. Vendor is selling two antenna options with the product. ...
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2answers
76 views

Impact of PCB thickness to an antenna design

I have an independent PCB design for a standard SMT-placed antenna. There are large ground planes on both side. I can understand that the thickness is going to change the values of the matching ...
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2answers
588 views

Difference between Antenna and Filter

In RF front-ends the diagram shows an antenna followed by a band-pass filter. I am also working on a project involving a micro-strip patch antenna followed by a dual-band band-pass microwave filter. ...
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18 views

What do I need to add/remove when changing from a external to internal antenna?

Currently using the nanopi NEO4 schematic to make my own pcb. In their design for wifi/bt they use the F89ETSM13-W2, they connect to a 12pF capacitor and then to a IPX connector for external 2.4GHz ...
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2answers
38 views

Cellular chip antenna feedline width?

I have a chip cellular antenna from Pulse W3544B. In the datasheet it is said to make the transmission line 1.34 mm thick which I feel is too huge and also I wanted to make a strip line for impedance ...
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1answer
72 views

Struggling with patch gps smd antennas connections

I'm struggling with antenna connections to GPS module in my PCB design. My antenna is a smd passive patch antenna, "SGGP.25.4.A.02 from Taoglas". The antenna shape and recommended footprint is in the ...
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1answer
654 views

How can I attach a custom built antenna to the NodeMCU (ESP-12E)

Is there any possibility I can disable/remove the PCB antenna and replace it with a custom one, like a directional helical antenna? Can I just solder it on? I am an absolute beginner and have no real ...
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2answers
71 views

does adding Vias through the antenna feed line change impedance?

I have a GPS through-hole patch antenna, the through hole need to be connected to the bottom layer and then from there the feed-line flows to the GPS receiver. But I want the GPS receiver to be on top ...
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1answer
70 views

XBee Pro Antenna Options - do the U.FL antennas have better range than the chip or micro pad antennas?

Logically the U.FL dipole antenna will have better range than the other two options, as it's a larger antenna, but is this actually true? How do the three antennas perform in relation to each other ...
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1answer
94 views

What is the purpose of this grid on the ground plane near a wifi antenna?

The PCB for this Steam Link has a grid of squares near the antenna. It also has pads for what I guess is either testing or adding 0ohm resisters. What is the purpose of this feature, and why are ...
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1answer
161 views

Designing 60hz antenna to detect electric field

I am working on designing an antenna to detect 60Hz electric field. I came across the microstrip antenna being used to detect the field. Before designing the antenna I wanted to maek sure this is the ...
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75 views

Designing NFC PCB antenna in multi layer instead of usual 1 layer antenna

I'm working on a new NFC reader board with serious limitations in dimension of the board. This cause smaller antenna coil, which affect on range and power of antenna. My boss suggested to design coil ...
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128 views

Why does my IR receiver PCB only work when I touch the sensor pins?

I have designed a PCB based on a schematic which I am pretty sure that is correct and I have tested the schematic several times on the breadboards and all of them worked properly. But, after I ...
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1answer
36 views

Can I find the loss tangent of a substrate if I know the thickness of substrate and its relative permittivity?

What is the formula to calculate loss tangent for a substrate with relative permittivity 4.4 and height 1.58 mm? I need the value for designing a PIFA with 35-micron copper ground conductor.
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3answers
1k views

How can I make Bluetooth (2.4 GHz) reception area narrow and controllable?

There are some Bluetooth modules available on the market, like the cheap HC-05 for 3 or 4 USD delivered. This one mentioned has an internal PCB antenna which I guess has a toroid-like radiation ...
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2answers
86 views

SPI, RS232 and DMX-512 data signals beneath the ESP8266-WROOM-02 Wifi antenna

I am working on DMX-512 Controller, which will accept commands for driving Addressable LED strip (GE60RGBW8812A) via ESP-WROOM-02 Wifi Controller and I have several data lines (...
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1answer
40 views

Eagle: How can I connect a Polygon IFA to GND

So I've just completed my Inverted F Antenna (IFA) as a polygon in the brd view on Eagle, I can connect the input section quite easily with an wire. Whilst the GND section of the IFA I'm having a bit ...
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3answers
172 views

Measure impedance of PCB antenna with very small ground plane

I have recently been designing different PCB antennas with very small ground planes due to design restrictions. I use a VNA to measure the impedances, but am having trouble measuring them correctly. ...
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1answer
178 views

How can I reshape this PCB antenna so that I can still use it with the given circuit?

I'm borrowing the RF design from the MICRF114 Development Kit. Here's user guide- http://ww1.microchip.com/downloads/en/DeviceDoc/50002433A.pdf The circuit I'm using is on p. 35 and the antenna ...
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1answer
189 views

PCB antenna and SMA connector

I have a question regarding an integrated PCB Antenna that I would like to try out, however, if it fails I want to be able to use another SMA antenna. The PCB Antenna is an inverted F-antenna meaning ...
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616 views

SIM800C - CME ERROR: 15 SIM wrong & CME ERROR: 10 SIM not inserted

I am making a GSM Tracker with SIM800C module. After deploying it into vehicles.. It works fine.. but after some days, it starts responding as CME ERROR: 15 SIM wrong for command AT+CPIN? & CME ...
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3answers
142 views

PCB Trace Impedance Matching on microcontroller

I'm doing research for the best antenna for a 2.4 GHz connection from our device to a local router. The problem is that our device will have varying loads connected to the other pins of the micro ...
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2answers
201 views

Modeling impedance matching network

Background I'm looking at the RF (LNA_IN) pin of ESP32 as described in esp32_hardware_design_guidelines. According to this document, the output impedance of the RF pins of ESP32 are (30+j10) or (...
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1answer
78 views

What should the input mpedace of an antenna be, 50 ohm or other values?

I'm about to match an antenna and a half-wave rectifier using Schottky diode. Both of them are placed in one PCB (PCB antenna). The input impedance of the half-wave rectifier is 6 - j170 ohm at Pin = -...
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1answer
496 views

Can you reuse FCC certification from a pre-certified RF chip and antenna for a new product?

I am in the process of designing a board that turns a Gameboy into a Bluetooth controller. Due to size constraints, I would like to use the ESP32-PICO-D4 standalone chip by Espressif instead of one of ...
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1answer
59 views

Board requirements for a chip PCB antenna?

TL;DR: What are the requirements of chip antennas like this one (without LNA) or this one (with LNA)? I see PCB size specs in the PDF, but I am not sure I understand how the rest has to look.Does this ...
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1answer
67 views

How add a chip antenna for the Bluetooth of the module BCM4339?

I have the following concern in a design that I am carrying out. I am working on the development of an electronic prototype that uses as a CPU the module: PICO-IMX6-SD. This module has wifi and ...
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1answer
222 views

Extra small RF PCB antenna - GND plane

My new PCB design is about 25 mm * 25 mm, this is not enough for a proper 868 MHz antenna ground plane, I am using the 0868AT43A0020 chip antenna where at least a 20 mm * 40 mm GND plane is required. ...
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1answer
114 views

reason for etching the green mask

I found the following board in random research. Can anyone explain the reason for etching the green mask in red color circled area and that too patterned? The other side of etch is the processor IC.
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1answer
137 views

Xbee pro s2c 2.4 ghz 10dbi Antenna and its effect

Just wondreing how to increase the range/distance of communication between two xbee modules operating in API mode, we are considering to replace the 2.4 ghz antenna of 5dbi gain with 10dbi high gain ...
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1answer
1k views

On board 13.56MHz RFID antenna design

I recently stumbled upon a two-in-one NFC key designed by N-O-D-E and was astonished. Although its original purpose is for security, I love the idea of using tact ...
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1answer
96 views

Placing “overlapping” PCB antennas

I currently have a design that features a BLE SOC that interfaces to a PCB antenna. Both the SOC and antenna are placed on one side of the PCB. What I'd like to do is place another (different) BLE SOC ...
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227 views

6 layer PCB layout with RF antenna track

I am doing my first 6-Layer PCB with RF antenna connection tracks. I am using this stack-up: L1 Signal Layer L2 Ground Plane L3 Power Plane L4 Signal Layer L5 Ground Plane L6 Signal Layer I ...
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1answer
389 views

Replace internal PCB antenna with external antenna

I want to replace these internal antennas with an eternal cable antenna - see pictures. I'm not an analogue engineer...am I going to run into trouble removing one of these and soldering a cable onto ...
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0answers
53 views

Microstrip for right-angled sma connector

I am designing a PCB with a wifi (2.4GHz) and LoRa (915MHz) modules and I need to provide right-angled through-hole SMA connectors for the antennas. Initially I thought I had everything under control,...