Questions tagged [pcb-antenna]

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

57 questions with no upvoted or accepted answers
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467 views

Large NFC/RFID reader antenna around a screen

I would like to have an NFC/RFID reader with a screen around 7", where one could tap the card anywhere on the screen to have it detected/read. I do not need to know where the card was placed (...
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1answer
483 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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45 views

Capacitive Touch Pad Design with TTP224 ic

I am designing circular capacitive touch pads of Dia:20mm driving from TTP224 IC on my PCB. There will be 2mm glass panel above Touch pads. My PCB contains other circuits like Arduino, Antenna bands ...
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1answer
188 views

Why does electrical phase vary with element length?

In a reflectarray antenna, each element on the antenna aperture requires a different electrical phase due to different distances from the antenna feed. One way to achieve this phase variation is to ...
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401 views

"Remote" NFC Antenna

I'm trying to put together a Near Field sensor where the pcb antenna can be remotely installed (about 2 ft away). I've looked at NXP PNxxx design here --- http://eng.utah.edu/~mlewis/ref/NFC/AN1445....
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39 views

2.4GHz BLE and 900MHz LoRa coexistence

I am working on a new design for a simple BLE to LoRa bridge. I have a chip antenna for LoRa that covers 868-915MHz and I was following the Nordic reference design for the 2.4GHz BLE antenna. What ...
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48 views

Is it beneficial to use a taper for the feed input of a PCB antenna?

What is your opinion on using a taper for the feed input of a PCB antenna? Say the feed is 2mm wide and the transmission line is 0.45 mm. Would a taper just cause more impedance mismatch? Or would it ...
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1answer
89 views

Covering PCB antenna with lacquer

In my project, I use ESP-12F module which has exposed (no soldermask) plated PCB antenna included in design. However I want my PCB to be waterproof and cover whole thing with waterproof lacquer. My ...
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211 views

Adhesive for FR-4 substrate

I would to know what sort of adhesive I can use to stick 3 FR-4 PCB's together? Back to back. These PCB's measure at 8 by 8 cm. With a single FR-4 substrate thickness at 1.6mm. The reason for ...
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116 views

How to read polar coordinates of radiation pattern

I have a PCB antenna which datasheet provides the following radiation pattern graphs: There seems to be a "weak" direction which the antenna signals is going to be very weak. Which direction is the "...
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129 views

PCB antenna radiation pattern

What radiation pattern will this integrated PCB antenna have? Will it be mostly horizontal (XZ plane), or mostly out the top side, or something else? It's a 2.4GHz module. Datasheet is here: http://...
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286 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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186 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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186 views

PCB vs SMD antenna for 2G cellular IoT device

I am designing an IoT module to read water sensors in an Agricultural field, then send the data through cellular to the cloud. My design uses the SIM800H, a quad band cellular modem, to send and ...
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346 views

Can I use meander antenna as show in below pic

I wondering will above antenna work properly or not because most of the PCB design layout antenna directed in right side & feed length remain unchanged. As per as I know, feed length does not ...
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51 views

Extra substrate in TSA

I have designed a tapered slot antenna operating in C band on an FR4 substrate . However , despite rigorous simulations the response has shifted by nearly 1 Ghz . I was wondering if extra substrate in ...
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140 views

vias in Meandering Monopole Antenna

I've recently been using the Texas Instruments CC1310 LaunchPad for some prototyping and now want to make a custom board. I would like the RF performance of my custom board to be as similar to that of ...
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198 views

Procedure for cc430 rf tuning with chip antenna

I have designed the 433MHz RF PCB with CC430F5137 with ceramic 50 Ohm chip antenna from Johanson Technology. I have also used Balun from Johanson Technology to match the CC430 and 50Ohm Antenna. I ...
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1k views

CC2541 PCB Antenna check

I'm designing a 4 layer CC2541 board. I'm using recommended balun from TI. I'm also using the same layer stack as in CC2541 Keyfob reference design. I'm following exact antenna dimensions mentioned ...
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66 views

What is this antenna and what is its radiation pattern

Sometimes, there are interesting antennas in the market. As often, the seller knows few things or nothing about it. This is what they say about it: Feature: Antenna frequency 740-6000MHz, good ...
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1answer
44 views

Using PCB and external antenna at same time for WiFi

If you use a design with an ESP8266 is there a possibility to use an external antenna (u.fl connector) with a PCB antenna at the same time without using a solder bridge or jumper? Generally speaking, ...
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24 views

PCB antenna: ground plane layers and dimensions (2)?

This question - sequel of PCB antenna: ground plane layers and dimensions?, talking about an IFA: The only dimension that really matters is the length/width of the ground plane, or parallel to the ...
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33 views

RF line: routing it orthogonal over SPI digital signal lines

SPI will be kept below 1MHz. RF signal is under 434 MHz. Is this crossing fine through the big zero ohm resistor ? Side question: will the outermost SPI line (it is the chip select one), or any of the ...
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73 views

B-field strength inside current loop antenna

I want to comprehend the design of a microwave antenna designed by Sasaki et al. (arXiv:1605.04627 [cond-mat.mes-hall]) As can be seen in Fig 2a the magnitude of B is strongest in the center of the ...
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1answer
131 views

PCB antenna connector and copper signal names

I am trying to build a PCB antenna similar to what is shown in this video. At the 6:24 mark it shows the circuit layout below: I am using Eagle to layout the PCB on a two layer board. ...
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36 views

Electric Field of Patch Antenna

I am working on developing Patch antenna for 5G Applications. As the first step, I am trying to understand the working and properties of Microstrip patch antenna. All the resources I have read state ...
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1answer
65 views

Unsure about designing an ultra wide band antenna

So, a bit of background, I have designed and measured some antennas in college so I have a decent theoretical grasp of the subject, but they were optimized for a narrow band usage and certain ...
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1answer
127 views

Circuit only works while touching the ground

so I am doing a small ESP8266 relay module. The relay is used as a SPDT switch so you can turn on the light with a normal switch on the wall but the module can shut them off after no motion is ...
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20 views

How to determine patch antenna slit/truncation size for RHCP?

I am designing a patch antenna for a project. It is running at 2.45GHz. I am looking into both rectangular and triangular designs. I need to have a single coaxial feed point. I found all the formulas ...
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104 views

Bluetooth antenna problem with SIM800C on my board

I have designed a board with a SIM800C and I have followed all details with its given datasheet. Everything is working well except the Bluetooth that gives very low antenna strength (less than 10cm.) ...
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113 views

PCB manufacturing - Why etch resist such as Tin is removed after the etchant has removed the unwanted copper

Alright so I'm learning the PCB manufacturing process. I have seen many professional PCB manufactures use "Tin" to be used as an "etch resist" which protects the copper traces ...
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101 views

Single trace width calculator for impedance matching

I would like to calculate the trace width of a dipole PCB antenna in order to match a 50ohm impedance. Obviously, there is no ground on the bottom side. All the impedance matching trace width ...
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80 views

Near-field microwave antenna design

How to I design an antenna which produces a strong field within the antenna, but doesn't radiate out or reflect back to the source? (as much as possible) I'd like ideally to have a planar structure (...
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1answer
48 views

Calculating link budget

I was reading and found that there are different ways to calculate "link budget" and I want to know which one is correct because they are confusing to me. For example, some sources state ...
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2answers
140 views

Antenna Tuning for Source Impedance not equal to 50 Ohm

I have designed a setup for 433.92MHz wireless device (a key fob). The source impedance is not equal to 50Ohm. The load impedance may or may not be 50Ohm depending upon the choice of the antenna. For ...
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1answer
55 views

Antenna for ESP32-pico-D4

If I was to make an antenna for BLE for an ESP32-pico-D4 by just making a wide cobber trace (as on the esp32). How long and how thick would it have to be?
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74 views

NFC 13.56MHz RF - Use inductor in place of pcb trace made antenna

I need to make a NFC antenna on NFC tranceiver->LC filter->matching circuit->antenna. Inductance shows to be 1.5uH on an online calculator of nfc antennas. Can I simply just place a good inductor of ...
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1answer
124 views

How to calculate component value of a matching network

You can already expect my knowledge level In antenna designing (newbie). This may be or may not be a stupid question. The reason is I don't know about this very much. Iam designing a PCB for ESP32 ...
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30 views

Calculate right inset for microstrip antenna to match trasmission line

So, I have designed a 2.4Ghz microstrip antenna. I have chosen a dielectric height of 1.5 mm with a dielectric constant of 4.08 I calculated my W and L of the antenna and simulated it in CST. I have ...
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29 views

RFID/NFC transponder with current delivered via wire

I'm sure everybody here knows how RFID transponder works, reflecting radio waves and receiving them at the source. I'm looking for the same concept, but instead of the input to the transponder being ...
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173 views

Antenova M20057 active antenna is not working

I have decided to use Antenova product which is M20057 (datasheet) as an active GPS antenna. I am using Quectel L96 GNSS module. There is an internal chip antenna on L96 module and I have tried the ...
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77 views

How far does a PCB antenna need to be from a capacitive sensing touch button?

From my basic understanding, capacitive touch works by having a small voltage applied to a touch plane on a PCB, resulting in a uniform electrostatic field. When a conductor (human finger) touches the ...
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1answer
67 views

Current induced on a transmisison line

I have a micro-strip transmission line as shown in the figure which is incident by an external EM field. This field will induce some voltage and current on it. I want to measure the induced voltage ...
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1answer
111 views

Does a pcb as patch antenna isolate itself?

I'm currently working on a prototype patch antenna for UHF. Since I'm out of copper at the moment, I used empty PCB's as base material (don't mind the PCB in between, it's only a spacer): So now my ...
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76 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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162 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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211 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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2k 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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1answer
283 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
652 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. ...