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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37
votes
2answers
17k views

How does a chip antenna work?

There are many guides to using chip antennas, with and without baluns, PCB layout considerations, etc., but I've been unable to find any information on how chip antennas work at a fundamental level, ...
24
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1answer
842 views

What is the purpose of the elements of this antenna?

I have a 5GHz 23dBi Wi-Fi panel antenna which has the geometry shown in the images below. I have been quite curious as to the purpose of this bizarre antenna design. The elements have such unique ...
21
votes
1answer
26k views

Designing a GSM PCB antenna

Before someone complains about my crappy design I should tell you that my knowledge on antennas or RF is near zero. I recently worked on a project that required a GSM module. After testing it on a ...
17
votes
3answers
2k views

Why can't you put a plane under a trace antenna?

I'm working with RFID for the first time. All the app notes I've read show a separate region of PCB allocated for the trace antenna, with no planes above/below. I want to understand why this is, and ...
14
votes
3answers
3k 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 ...
14
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2answers
3k views

PCB Ground Pour, Crosstalk and antennas

I'm trying to understand the effects of polygon pour fills when high speed line transitions might occur. Consider the fabricated case example below: In this example the tracks (colored in light blue) ...
14
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1answer
1k views

Need help with selecting an antenna for PCB

I have designed a pair of circuits which utilize the QAM-TX2-433/QAM-RX2-433 transmitter/receiver. So far everything is hooked up on solderless breadboards, with just a length of wire for antennas. ...
11
votes
1answer
2k views

What are these uniform traces that extend to the board edge?

These Super Famicom cartridge PCBs have what appear to be uniformly-spaced traces extending all the way to the extreme left and top of the board. They don't look castellated (and there are easier ...
10
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1answer
7k views

50Ω Impedance Matching with Signals Through Vias

I'm working on an IoT board and it is all laid out (LTE, GPS, BLE, WIFI - 30mm x 30mm -- VERY TIGHT). As a design concession, I have to use vias to route some of the RF signals. There's no other way ...
9
votes
2answers
2k views

PCB Antenna design for nRF2401

I'm integrating an nRF24L01+ chip into a PCB I'm designing, but I'm a little confused about the best PCB antenna design. In the datasheet for the chip, they specify an antenna like this: However, all ...
8
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2answers
1k views

Can a screw hole in between PCB antenna reduce efficiency significantly?

I am attaching a photo of what I have done. This hole is not suited there, but how much it is going to affect the performance of the antenna?
8
votes
2answers
472 views

How do ZOR antennas work?

In a Dialog application note (AN-B-027), I ran into this rather curious antenna for 2.4GHz operation: This is on two PCB layers connected with vias; the whole thing is shorted together at DC, but ...
7
votes
3answers
7k views

In Eagle PCB, how can I reuse devices from existing schematics?

I'm making an Eagle PCB schematic design, a break-out board for the TI cc2540. I have a reference Eagle design with a PCB antenna, and I would like to use that antenna. Looking at the element "info" ...
7
votes
3answers
4k views

Possibility of an extremely directional antenna

I'm fairly new to RF technology, but a direction-finding application has come up where a highly directional antenna can offer a convenient solution, so I started searching for such antennas. Most, ...
7
votes
1answer
752 views

Preferred balun location? (Are differential microstrips preferrable to single-ended?)

I'm designing a PCB with a transceiver that has differential signal pins for rf. These differential signals travel to a balun, which transforms them into a single-ended signal (50-Ohm characteristic)....
7
votes
3answers
6k views

Altium clear region

I have a four layer board: Signal, GND (internal power plane), VCC (internal ground plane), signal. My design includes a chip antenna that requires a completely cleared region at the edge of the PCB. ...
7
votes
2answers
1k views

Placement of RF module for better performance

I am using a standard RF module (i.e., Bluetooth-module-on-PCB), which has a PCB-trace-type anntena. It is in turn to be soldered onto my main PCB. The whole thing will be powered by a standard Li-ion ...
7
votes
2answers
1k views

How do I calculate a PCB antenna trace width?

I'm totally stuck here trying to find a single source that describes how to determine a PCB antenna trace width. I understand how to determine the length based on the targeted wavelength, but the ...
6
votes
1answer
1k views

Antenna Design for specific directions

I am designing an antenna for a device and was hoping to gain some insight in the correct design direction for the antenna. The Idea: A receiver & antenna that fits in a 6" diameter by 3" deep ...
6
votes
2answers
1k views

Why do some PCB antennas have a return path to ground?

I'm finding it hard to find an answer for the question, as I'm asking about the circuit's GND, where searching for an answer online or in stack-exchange is coming up with Earth GND for large Antennas ...
6
votes
1answer
2k views

PCB Antenna Design

Before asking the questions, I have read App notes for TI, Cypress and Atmel. Those really helped me clear basics of RF Antenna designs. This is my first time with any RF PCB design, so before ...
5
votes
4answers
2k views

Developing BLE device. Questions

I am designing a bluetooth low energy device. It basically reads a sensor over I2C and collect data. You can check data in your phone whenever you want. I have two questions, one related with antennas ...
5
votes
1answer
14k views

Open Source or free electric field mapping software

Looking for recommendations for 2D (or 3D) electric field mapping software. I want to be able to populate a series of electrodes in a plane and understand the equipotentials present when these ...
5
votes
1answer
3k views

Help to understand/ explore small sized 3G and GPS Antenna Design

I recently came across an exciting device called Automile, from Sweden and what caught my eye is this - I am really impressed by the packaging and overall quality of hardware integration they have ...
5
votes
1answer
1k views

How to identify and remove unintentional PCB antenna?

It has been pointed out to me, more than once, that I might be making a few too many antennas unintentionally on the PCB with the copper pour, an obvious example is this L shaped pour at the edge of ...
5
votes
1answer
127 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.
5
votes
1answer
305 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 ...
5
votes
1answer
235 views

sizing a DC bias RF choke for a differential antenna + PA

Trying to figure an antenna for the Si4012 RF chip. Page 26 of https://www.silabs.com/documents/public/application-notes/AN639.pdf talks about feeding the two sides of the loop antenna through two ...
5
votes
1answer
984 views

Why longer antenna coaxial cable has better efficiency?

I am not an RF engineer and I don't understand why for the same PCB antenna but with longer cable length can have better return loss and efficiency. I am comparing W3538B0150 with W3538B0200. I ...
4
votes
3answers
3k views

Help with PN512 basic PCB antenna design

I'm designing a small board that integrate a PN512 IC along with other components (MCU, etc). I need to build a proof-of-concept device for a presentation with the suit people and everything is ready ...
4
votes
2answers
7k views

434MHz PCB Trace Antenna Design

Can anyone provide a reference design for a 434 MHz PCB Trace Antenna? Is it just a matter of creating a snake trace pattern about 17cm long and slapping a ground plane under it (with a trace ...
4
votes
1answer
590 views

Getting started with Qualcomm reference designs

I am looking to get started with Qualcomm Reference Designs. I am partly inspired by this article: "Start Your Own Smartphone Company for $1,000". I have an application that I would like to be able ...
4
votes
1answer
2k views

How does a cube sat communicate with ground station with a 1w antenna

I heard that cubesat signals can be received with a hand held radio. Its confusing me that how a 1 metre antenna radiating 1watt energy can simply be received using hand held radios. I am designing a ...
4
votes
2answers
486 views

How to properly layout an external antenna seating and on board antenna at the same time?

I want my board to have the ability to opt for either an onboard antenna or an external one, with a 0R chip resistor, naturally. This is my initial setup: But then I am told that this is flawed and ...
4
votes
2answers
256 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 ...
4
votes
1answer
2k views

Is this layout good? (RF - 2.45 GHz)

I finished laying out HACK, my first RF (2.45 GHz) layout. The sensitive part is the connection between the IC (Atmel SAM R21G18A), the balun (Johanson 2450BM15A0015), and the PCB antenna (copied from ...
4
votes
1answer
851 views

How is impedance matching for chip antennas practically done?

I designed a PCB for a GPS tracking device and i want to further develop it to have a smd gps antenna mounted on the board. I know that for optimal signal transfer i need to design a matching circuit, ...
4
votes
2answers
2k views

Antenna: Impedance matching vs. tuning

I always try to tune my pcb antennas in length, so they operate in resonance, by cutting the antenna with a scalpel and then matching the tuned antenna to the transmitter. But recently an RF engineer ...
4
votes
2answers
1k views

How to select a 2.4GHz chip antenna for a space-constrained environment?

I need to use the DA14580 BLE chip for my project. The problem is for the antenna. The reference design provided for the antenna is only PCB trace that's is too big for my project: I don't know how ...
4
votes
1answer
3k views

Chip antenna PCB layouts and feedline

I'm trying to determine the most effective layout for a 2.4GHz chip antenna on my PCB. I';ve read through a few application notes and Datasheets but none really clarify which antenna setup is most ...
4
votes
1answer
325 views

How to reduce objects/hands impact on PCB antenna efficiency

I am trying to learn about planar inverted F antennas creation and have designed two different designs for two different frequencies with success. One seems pretty much unaffected by the proximity of ...
3
votes
7answers
2k views

Will this PCB trace GSM antenna be affected by EMI?

I am designing a PCB in which there are 3 SIM800 GSM modules sharing a (commercial) external antenna. The external antenna is connected to the PCB via an antenna connector, and from that connector, ...
3
votes
2answers
890 views

Function of solid plane in the NFC antenna

Below picture shows 2 NFC antenna designed by NXP for their NFC chips . As you can see there are square planes in the middle of antenna,these planes have no Nets(does not connected to any where ). ...
3
votes
1answer
1k views

ESD Protection with no grounding

I've designed an RF device that runs via a USB connection to a PC. It needs to be connected to an outdoor antenna to receive a telemetry signal. On the antenna input PCB trace i've added an ESD diode ...
3
votes
1answer
1k views

Grounded coplanar waveguide - too wide signal wire - how to handle properly?

I'm struggling with specifying the convenient signal wire width for the grounded co-planar waveguide for the following parameters: - PCB: FR4, 1.5mm - copper thickness: 0.035mm - pad to pin lenth: 9....
3
votes
2answers
1k views

Can 2.4GHz antenna radiate through a small enough enclosure opening?

I am designing a device with two stacked parallel PCBs of which the top one serves as a front panel (with touch pads), while the bottom PCB holds all the components. I need to add a Bluetooth LE ...
3
votes
2answers
807 views

Using a 434MHz PCB Trace Antenna

Further to this question: 434MHz PCB Trace Antenna Design. If I select a suitable 434MHz PCB antenna design and make two of them, what is the minimum extra circuitry I would require in order to de ...
3
votes
1answer
4k 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 ...
3
votes
1answer
2k views

PCB microstrip antenna

I have a query regarding PCB microstrip antennas. Most of my antennas have been straightforward with the U.fl being placed close to the RF feed point. Maybe a PI filter is added. But I have seen many ...
3
votes
1answer
413 views

Is 3dBi PCB etched GSM/GPRS Antenna Possible?

Is it possible to design a GSM/GPRS antenna that has a gain of 3dBi? if not, what is the maximum gain possible with a PCB GSM/GPRS etched antenna? I'm thinking of a PCB sized 11cm long and 5cm width. ...

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