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Questions tagged [antenna]

Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g. TV or radio) waves. -Wikipedia

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MICRF112: loop vs monopole antenna

I'm designing a PCB that trasmit over 433 MHz with MICRF112. The datasheet says that the device works with monopole or loop antennas. I decided to go with a monopole antenna. This is the example ...
ocirocir's user avatar
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Can we catch signals from a cellphone using an external device? [closed]

What if someone stole em waves from our mobile devices to listen to our conversations or get our OTP. Whatever encryptions they have they are just EM waves innit and they cannot be propagated only in ...
Newtron Malayalam's user avatar
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Maximizing magnitude of fields created by an antenna

I have a small loop antenna (\$C\$ = circumference<< \$\lambda\$ ). I am interested in the fields created by this loop at a distance \$D\$ along the z axis also small compared to \$\lambda\$. I ...
DarkBulle's user avatar
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Electrically long loop antenna with homogenous near B field inside antenna loop

I wanted to know is it possible to create a loop antenna that functions in a way like a high frequency helmholtz coil. Because a helmholtz coil is usually made with multiple turns of wire having high ...
Girts's user avatar
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Obtaining SAR for my patch antenna in HFSS

I have designed an implantable patch antenna for biomedical applications and I have obtained SAR values which looks like this in the image below. This is Average SAR and I couldn't get local SAR for ...
calebsamuel D's user avatar
2 votes
1 answer
49 views

Single stub matching of loop antenna at 4.2 GHz

I am trying to match a loop antenna using the single stub matching technique. Operation frequency: 4.2 GHz Vacuum wavelength: 7.2 cm Cable: Impedance: 50 Ω Velocity factor: 0.66 The antenna impedance ...
DarkBulle's user avatar
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2 answers
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Question About Utility Company Antenna Power/Radiation Concerns [closed]

Removed due to personal data, thanks
VWjetta's user avatar
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Are these antennas interchangeable?

The small rectangular antenna in the left hand side of the case came with the device (Lilygo-T-RelayS3). The larger one outside the case came from a different device (Old Particle Photon). I was ...
totalconfusion's user avatar
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Matlab simulation of PCB IFA

I am designing a PCB IFA and to get used to simulating it later down the road, I decided to first simulate an existing, known working design. Known design for 0.062" Substrate (page 3) This is ...
JonathanG's user avatar
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2 votes
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If electromagnetic waves are indeed created by a changing electric and magnetic field, then why don't we see magnet based antennas?

I understand that exciting electrons, basically freely moving electrons cause electromagnetic waves. The faster they accelerate the higher the frequency of the waves. If this is indeed the case, then ...
Vishwa Mithra Tatta's user avatar
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Adding SMA connector to a 433 MHz remote

I need to open a gate from 100 meters distance. This gate uses a 433 MHz rolling code remote. The only option I see, is to connect an active amplifier to the remote using a SMA connector. Those ...
user3161330's user avatar
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Correct connection of a Wi-Fi board having both printed antennas and U.FL sockets

An RF part of a dual antenna Wi-Fi module from Aliexpress. We can see coax sockets connected in parallel to printed antennas. Two external antennas and corresponding pigtails are part of the package. ...
ololo ololo's user avatar
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ESP32: Does PCB without copper affect the keep-out zone of the antenna?

Espressif recommends in their PCB Layout Design that the antenna is placed outside of the board, either top right or bottom right. Interestingly a placement to the top left or bottom left is not ...
Tintenfisch's user avatar
5 votes
2 answers
574 views

Simple method to generate nonuniform magnetic radiation in a region of 0.5 mm?

I need an antenna that can generate a nonuniform magnetic field over a very tiny region at 5 GHz. (By nonuniform, I mean that the field vectors are diverging as much as possible. I will place this ...
Steven Sagona's user avatar
1 vote
1 answer
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Polarization Derivation

Can how I can find the phi and theta unit vectors as described (Eq. 4a and 4b) in the following paper on antenna cross polarization? I thought the thetha and phi unit vectors were the same as those of ...
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What differences in terms of fields does a grounded metal and an unconnected metal object have

I previously asked a question regarding absorption and reflections of waves to metal. But id like to know the differences that say a PCB metal pour that is connected to a signals return path, and a ...
George kirby's user avatar
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Would two antennas on the same board work well?

I'm building a circuit based on Nordic´s nRF91, my project involves making a compact solution for acquiring location, having to fit it to a small enclosure I'm thinking about making a board for both ...
DMinatto's user avatar
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Understanding radiation efficiency and operation of 35 foot whip antenna in the 2MHz to 30 MHz band

Some 35 foot whips are designed to operate in the 2 MHz to 30 MHz band e.g. Valcom 35-Ft Aluminum Whip Antenna AS-3772 B/U. The length of whip antenna is around wavelength divided by 14. Can anyone ...
NAYAN SHELAT's user avatar
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How Impinj speedway r420 switch the antennas

I'd like to use Impinj Speedway r420 for localization of tags with multiple antenna. To realize this, I want to know how the reader switch their antennas, such as the duration of switching, and the ...
山口諒's user avatar
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1 answer
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How can I connect a CHW1010-ANT1-1.0-ND to an nrf5340 development board?

I would like to connect a CHW1010-ANT1-1.0-ND to an nrf5340 development board to implement direction finding. This is in the datasheet of the CHW1010-ANT1-1.0 The nrf5340 has a Murata MM8130-2600RA2 (...
beestree's user avatar
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Filter and Antenna S11 measurement

I have this circuit below where a BLE chip is connected to the filter and then to the antenna, I've been requested to find S11 from the chip output (for the filter and antenna) when I use ENA to find ...
Alan Alan's user avatar
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1 answer
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Phase array for long waves

Can I make phase array for waves that are much longer than the array? For instance, I am looking at 1m array for waves of up to 100m. is it possible?
TQQQ's user avatar
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Wideband Dipole Antenna Ideas

I am home brewing an FM radio and have this so far. It works great for stations within +-5 MHz of my antennas resonance, but I want to hear more stations farther away on the spectrum. For this reason ...
Yousif Alniemi's user avatar
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What is the difference between Main Antenna and Rx-diversity antenna

I am using Quectel SC200 in my design .Below is the description of it's antenna interface. SC200E-CE/-EM/-NA and SC206E-EM/-NA provide four antenna interfaces for the main, Rx-diversity,Wi-Fi/...
Confused's user avatar
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Best orientation of common antenna types relative to whip antenna? [closed]

Whip antennas are often described in their datasheets as omnidirectional but despite this, I've often read that when you have two whip antennas communicating with each other, the best orientation is: ...
George Hawkins's user avatar
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0 answers
21 views

i have two patch antenna (coaxial ) and i want to put csrr

i have two patch antenna (coaxial ) and i want to put csrr and i dont get any result on Hfss i substract the Csrr from the ground and from the substract and still same result with and without
Fahd Le's user avatar
3 votes
2 answers
296 views

Monopole antenna impedance measurement

We are using a low cost (sketchy looking datasheet) external 915 MHz monopole antenna in our product and we're seeing a large variance in RF performance across the 50 pieces that we built. Here's ...
rith87's user avatar
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1 answer
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Add resonances to monopole antenna

How can I design a "simple" low frequency monopole antenna with multiple resonating frequencies? I elaborate... I need to design a sort of monopole antenna with multiple resonating ...
Shika93's user avatar
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2 answers
65 views

Are swivel/rod antennas always dipole antennas?

I'm confused, Digikey has a huge range of antennas, that look like the one above, which they characterize as "whip antennas". Wikipedia says here that a "whip antenna is a form of ...
George Hawkins's user avatar
2 votes
1 answer
94 views

How to terminate a monopole antenna

There seems to be some debate on emphasizing the importance of impedance matching for maximum power transfer vs maximizing signal to noise ratio with receiving antennas. Some vote for one, some state ...
Yousif Alniemi's user avatar
3 votes
1 answer
104 views

Are there advantages to sleeved balun over plain whip for short 2.4GHz antennas?

First, apologies if my terminology is wrong - by sleeved balun and plain whip 2.4GHz antennas, I mean: Sleeved balun Plain whip Taoglas CBD01.07.0100C TTM 66089-2406 If you buy 2.4GHz drone ...
George Hawkins's user avatar
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0 answers
63 views

GPS Signal Amplifier

I am completely new to RF. I am using this module in my design.I need to add a power amplifier for the GPS signal present in this IC. This IC will be installed between this module and GPS antenna. The ...
Confused's user avatar
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I'm trying to connect an AS3933 chip to a CAS143-47

So basically AS3933 has 3 pins (LF1P, LF2P, LF3P) which need to be connected to pins of 3d antenna (CAS143-47 in this case) and to common ground LFN. My CAS143-47 antenna has 8 pins with 3 pairs of ...
Angela 's user avatar
2 votes
1 answer
109 views

What is the purpose of a shunt element in a balun?

I'm working on a balun for a differential front-end receiver and see that they quite often use a shunt element (inductor) across the differential pair. From what I could gather is that when you insert ...
bluscape's user avatar
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0 answers
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Chip antenna matching of a custom board equipped with a STM32WB55

I am planning on designing a custom board using a STM32WB55. I have followed the "How to develop RF hardware using STM32WB microcontrollers" (AN5165) Figure 9 design for the RF part, which ...
Andreiul's user avatar
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2 answers
87 views

EMF Meter: difference between AC magnetic, AC electric, and RF Measurements

let's consider this EMF Meter. Regarding its description, I have some doubts regarding what it is physically trying to measure: Detects all three types of EMF pollution: AC magnetic, AC electric, and ...
Kinka-Byo's user avatar
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1 vote
2 answers
298 views

"JieLi Tech AC6329C4" design

I'm trying to design a basic "very cheap" bluetooth solution, that can connect to my phone and turn on a light emitting diode via a signal. The cheapest BLE IC I could find was this one on ...
Mustansir Godhrawala's user avatar
0 votes
1 answer
82 views

Advice on RF circuit design - Pseudo-Doppler

I'm planning on building a Pseudo-Doppler Radio Direction finder, and have some questions for those more experienced than I am. For those unfamiliar, a Pseudo-Doppler DF device is a device that by ...
DBVT's user avatar
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1 vote
2 answers
143 views

Identifying monopole antenna with ground connected coil

I can’t find any information on what this design of antenna is called, it has a monopole wire connected to the signal pin of an SMA connector, the coil is connected to ground. The larger diameter ...
josh eanes's user avatar
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2 answers
163 views

Why don't people always use 50 ohm resistors when matching impedances?

Impedance matching when designing the RF receiver circuit and antenna design takes a lot of time and effort for VNA. People often use capacitors and inductors to match the impedance of the antenna ...
Nguyễn Tiến Sang's user avatar
0 votes
2 answers
77 views

GPS fix with plastic lid closed [closed]

I have a product where I'm using Adafruit Product 746 (Ultimate GPS Module - 66 channel w/10 Hz updates - PA1616S - MTK3339 Chipset). I'm using this external active GPS antenna "32db High Gain ...
vicatcu's user avatar
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0 votes
1 answer
50 views

Rewinding a Tecsun AN-100 MW antenna for LW application

The antenna has a diameter of 23cm. It is 0.8mm diameter wire, with a total of 30 turns. The primary winding is 360 µH with a variable capacitor for tuning with a capacitance between 5.3 pF and 280 pF....
Alexander Gräf's user avatar
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Does the minimum value of the S11 (return loss curve) at the resonance frequency depend on the resistance of the antenna?

I was trying to fabricate a flexible NFC antenna. Initially, I fabricated my design on a copper PCB. It worked perfectly fine with my NFC chip and facilitated NFC communication. I observed its S11 ...
Isuru Bhathiya's user avatar
1 vote
2 answers
57 views

2.4GHz antenna routing - my version vs reference board layout

I'm working on a project with an nRF52840 on it. Due to space problems on the board I have to deviate from the setup recommended by Nordic, and I lack the experience to tell if I'm setting myself up ...
Gambanishu Habbeba's user avatar
0 votes
1 answer
154 views

Ground plane for PCB Antenna

I'm working on a PCB and want to incorporate a 2.4GHz PCB antenna but am a bit confused on how to handle the ground plane(s). This is a 4-layer PCB with Signals (and ground pour) on the top layer, ...
Nollstead's user avatar
3 votes
1 answer
98 views

Which antenna trace design is better?

I need to design an antenna trace (WiFi and Bluetooth) that connects an ESP32-S3 chip to an IPEX connector with an impedance matching circuit. I have some constraints that I need to work around: ...
Spatz's user avatar
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6 votes
2 answers
122 views

How accurate is the antenna reciprocity principle in practice?

The Antenna Theory book by Balanis goes through a theoretical explanation. In my real antennas (I'm an Amateur Radio operator) there are other things like transmission lines and matching circuits. I'd ...
gschro's user avatar
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1 vote
1 answer
74 views

Where do I place my matching network for an antenna?

Let's say I have a microcontroller with an antenna output. The characteristic impedance of the pin for the antenna output is x+jy. I want to then connect it to a 50-ohm antenna. This is the part that ...
JoeyB's user avatar
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1 vote
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Max operating temperature for PCB/Chip antennas

I'm looking for an antenna (PCB or chip), which I'd like to install in an environment that can exceed 110°C. Here are my questions : Should I trust the temperature ranges given for antennas? The ...
Juno's user avatar
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1 vote
0 answers
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Most efficiently adapting IPEX-MHF1 (Wifi-Card) to IPEX-MHF4 (Antenna)?

We have a lot trouble with the windows driver our Intel Wi-Fi 6E AX211 Wifi-cards. It randomly looses connection and it's a general problem, that a lot of users ...
Tomblarom's user avatar
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