Questions tagged [radiation]

While rare, this tag should be used for questions pertaining to using electronic devices (passive or active) in an ionizing radiation environment. This could be space, medical facilities or physics labs. Defense or military related questions are probably classified.

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44 views

Can ESP32 radiation cause health hazards?

I am using ESP32 chips for a smart health monitoring device. I will use WiFi 802.11n or Bluetooth BLE/EDR depending on the amount of data to be transferred, so the unit will be mounted on hand, maybe ...
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0answers
42 views

Question regarding GM Tubes Calibration Frequency

My friend has has been using GM Tubes for more than a decade now. He has been calibrating them once per year. But the calibration data reveals that his GM Tubes would have remained within allowed ...
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1answer
77 views

What does these heatsinks do?

I think sharing the video will be the easiest way of describing the situation. The transistors are electrically isolated from the heatsinks, I have checked with multimeter. Few days ago, I have ...
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1answer
69 views

How to block / lessen EM-radiation/signal from home Wi-Fi router? [closed]

1) What materials and how can I use to completely block radiation from two antennas of my WiFi router? 2) What materials and how can I lessen by 20-50% radiation/signal from the third router antenna? ...
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2answers
179 views

How much electromagnetic/electric radiation does laptop/computer emit? [closed]

How much electromagnetic or electric radiation does laptop emit? I don't know in what measurement system you have to answer, but at least, I want to get the answer which should be enough "research" ...
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0answers
49 views

Interpretation of data

I hope this question meets the standards of this platform, if not please inform me of how I can improve it. I was trying to design an antenna and I have done so. I am planning on using this antenna ...
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0answers
25 views

Increase in gain of CP micro-strip patch antenna [duplicate]

I have successfully designed my circularly polarized patch antenna shown below. I used the slot method. Which as a bandwidth of 23MHz and a resonance frequency of 915MHz. Though the bandwidth is small ...
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0answers
36 views

Axial ratio of a square microstrip antenna

I am currently designing by CP microstrip antenna using CST. The picture is shown below. However, when I view the axial ratio plot, also shown below it is way above 3dB at 90 degrees. the patch is 31,...
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0answers
19 views

Microstrip square patch design [duplicate]

Circular polarized micro-strip patch antenna This question defers from the previous in that I want to know how to calculate the lengths for A,B and C. I want to know how to calculate the values of A,...
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0answers
22 views

Patch antenna design [duplicate]

Can anyone assist me regarding the design of a circular polarized rectangular patch antenna that is driven at adjacent sides through a power divider? I already calculated the parameters of the width ...
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1answer
110 views

Circular polarized micro-strip patch antenna

Circular/ Elliptical patch antenna design after a bit more research I realized what my mistake was, after a user pointed it out. As such my new post. I have come across a CIRCULAR POLARIZED PATCH ...
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1answer
101 views

Why 'the electric current is “shorted out” by the conductor' in Stutzman-Thiele Antenna Theory and Design?

Page 346, in Stutzman-Thiele Antenna Theory and Design-3d edition, reads 'the electric current is “shorted out” by the conductor' and is thus nullified. Refer to part c of the image below: In this ...
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0answers
75 views

Circular/ Elliptical patch antenna design

I am trying to design a circularly/elliptical polarised antenna like the one in the picture. My frequency is 915MHz, a dielectric constant of 4.4, the thickness of the substrate is 1.6mm, thickness of ...
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1answer
101 views

How does this circular polarized antenna work?

I recently obtained an RHCP antenna, but when I opened it to investigate what's inside of it I found it to be different from the conventional RHCP polarized antenna. I have included pictures in this ...
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1answer
64 views

How to calculate maximum effective radiated power in any direction for Galtronics small cell site

Answer Calculations from PE commissioned by AT&T: the GQ2410-06621 antenna does have 10 total input ports, however, our analysis of the AT&T DAS node includes only the frequencies and power ...
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1answer
53 views

FDTD simulation for beginners using matlab

My previous posts are as follows: 1.Mitigation of dead zones when applying circular polarized antenna 2.Standing waves modes inside a cavity resonator 3.Visual understanding of EM fields within a ...
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1answer
63 views

Multimode cavity resonator

From my previous posts Insight into cavity resonators, Visual understanding of EM fields within a rectangular metal container I have slowly gained a better insight into cavity resonators and thereof. ...
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1answer
41 views

Antenna's resistance: meaning and evaluation

When I studied elementary antenna's theory, I saw that the resistance (for simplicity let's consider only the resistive terms) of an antenna Ra is made of: 1) a parasitic resistance Rl, which causes ...
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2answers
343 views

Insight into cavity resonators

Modes of a waveguide As shown in the link above, they show how these modes work for various values of m, n, and p. However, where is the antenna/ source of radiation placed within the cavity? From ...
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3answers
263 views

Visual understanding of EM fields within a rectangular metal container

I have the following scenario setup inside a rectangular metal container. The container size is 12.03m by 2.39m by 1.84m (lxbxh). Additionally, inside the container I have placed 4 antennas equally ...
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1answer
68 views

Mitigation of dead zones when applying circular polarized antenna

I would like to know if I used a circular polarized (RHCP) antenna inside a metal container as show in the configuration below will it reduce the dead zones, as compared to a linear polarized antenna? ...
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1answer
57 views

Detecting radiation - Looking for ideas

I have to detect a small radiation from this tags and I´m looking for some ideas how I can do this with some kind of small electronic circuit (or lecture to read how to do it) - not with a Geiger-...
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1answer
58 views

Long term health effects of a gsm modem [closed]

We all use internet through our mobile phones hence gsm infrastructure. I know the radiation exposure is higher than wifi. That's why I preffer wifi over mobile whereever i can. However I'm currently ...
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0answers
143 views

PIN Photodiode gamma detection amplifier circuit - rectangular wave output

I've been working on a project recently, where I need to build a device which detects gamma radiation and can be used for gamma spectroscopy. I've done some research and found many interesting ways of ...
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2answers
206 views

Am I exposed to high levels of radiation at my job? [closed]

I made this post because I have a safety concern about my job as medical device tester. I was reading the user manual of the equipment I work with and found the next warning: “Per FCC regulations, ...
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3answers
109 views

Non-ionizing radiation [closed]

This is out there - But hear me out. There is a new device on the market that promotes baby sleep by playing white noise. The speaker is directly under the baby’s head while sleeping (separated by ...
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2answers
4k views

Why do radiation hardened IC packages often have long leads?

What purpose do long leads serve?
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0answers
59 views

Radiation Source placement and waveguide parameters for Horn Antenna

I am designing ("arranging", actually) a horn antenna for a 77-81 GHz Radar. My module has a patch antenna which can't be placed inside the waveguide for some reasons. After the patch antenna, we have ...
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3answers
278 views

Physics of Dirty Electricity? [closed]

I've been reading about "dirty electricity" lately and while I know there's much controversy whether it causes adverse health effects this question is not about that subject. I'm simply trying to ...
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2answers
898 views

Microwave starts working when door opens - how dangerous is it?

I've just rented a house that came with an equipped kitchen, and I've found that the microwave has a rather weird behavior - opening the doors seems to trigger it to start working, which the owners ...
1
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1answer
122 views

Reflection of Electric field in open-circuited transmission line

Consider a parallel-wire or parallel-plate or coaxial transmission line, carrying TEM wave, which we model as E,H,V,I, each having a forward(+) and backward(-) wave. In terms of V,I, we define ...
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2answers
120 views

Photodiode Output measurement

I'm using Hamamatshu s8559 photodiode to convert x-rays into it's respective energy. I'm using a 10 bit ADC converter. The problem I'm facing is I have no relationship between the Photo-current ...
14
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6answers
4k views

Can antennas be viewed as light sources?

Clearly antennas are nothing but a device to radiate the electrical energy through electromagnetic waves. Since visible light is also simply a certain range of frequencies, isn't it more easier to ...
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1answer
153 views

Ability of a 100km power transmission line to radiate 50Hz EM waves?

This is about confusion of relating antenna radiation theory to power lines. Assuming a straight 100km or even longer possible power transmisson line with 50Hz frequency. What can be said about the ...
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1answer
175 views

Are headphones with EMF measurement of 10,000 milligauss harmful to me?

I used a EMF detector app on my phone and measured the EMF output on my wired headphones. It measured around 10,000 milligauss on one part of both ear cups. Since wearing these headphones on my head ...
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1answer
421 views

Can a magnet cause a microwave oven to unsafely radiate energy?

I've already successfully warped the colors on a large old CRT Television by setting unshielded speakers on top of it. If I understand correctly, this was due to the deviation of the electro-magnetic (...
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2answers
552 views

Does an electrical outlet radiate EM waves? [closed]

Please consider all cases even with a tiny values. If plug two separated wires to each terminal of electrical outlet, like shown, will it radiate em waves? ...
3
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2answers
693 views

What is the acceptable margin for radiated emission on an European CE device

One of our prototype (IOT gateway) has completed the emission test (EMC) but we have a margin on two particular frequencies, just wondering what is the acceptable margin for CE device in Europe ? I ...
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1answer
216 views

Calculate radiation power of an antenna in respect to a given antenna radiation pattern and a given angle

I work on a program that simulates the wave propagation of high frequency electromagnetic waves (2.4 or 5 GHz Bands) in 3D. I use a ray launching approach, where the emitted rays approximate the ...
4
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3answers
563 views

PCB design - signal loops

I've read about loops that a PCB designer should avoid them "mostly about ground loops" but i think I've read also about power. so in this case, is this wrong: ???
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5answers
364 views

Short-range radar and LIDAR, how do they work?

I was wondering how does short-range radar and LIDAR work? Considering the speed of light, the receiver sampling rate would need to be extraordinarily high to detect short-range distances(sub 1-2 feet)...
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3answers
156 views

Radiation Effects on Electronics

I'm developing a magnetic field sensing kit for a project. The kit contains sensors (specifically an accelerometer, a gyroscope, and a magnetometer) that will detect and measure magnetic fields, and ...
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1answer
103 views

How to build EMF radiation protection [closed]

I've recently started to use my laptop more and more on my lap and I'm worried about exposire to radiation emmited by the laptop. I keep it at a distance of about 10cm but still... I was wondering if ...
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1answer
72 views

Slayer Exciter Interfering With Voltage Measuremnet With Multimeter

I've built myself a slayer exciter and I am trying to measure the output voltage. I've created a coil with approximately 10 turns and soldered a bridge rectifier to the ends of the coil so I can ...
10
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2answers
1k views

What is a “half latch” in an FPGA?

In a paper about radiation hard FPGAs I came across this sentence: "Another concern regarding Virtex devices is half latches. Half latches are sometimes used within these devices for internal ...
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1answer
2k views

How do I calculate the length of a transmission line?

A quick translation: Generator has \$Z_g = 50\Omega\$ and 12 V. The line is loaded with an unknown RL. We observe we have a maximum of 8 V at 250 MHz and a minimum at 500 MHz. Solution: Asks for the ...
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0answers
639 views

Photodiode OP-AMP circuit for UV light radiation

The project: The aim is to be able to use the photodiode to detect plasma (radiation in the UV light spectrum). The photodiode suggested for this application is the BPX65 and I currently have access ...
2
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2answers
208 views

Slayer Exciter Health Hazards

I recently made a slayer exciter which produces arcs about 1-2 inches long. It also makes any electronic device near it go mad (it froze my iphone 6S when I was recording the arcs). What radiation is ...
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1answer
91 views

electricity substation radiation measurements [closed]

I live next to an electricity substation and want to contact the operator/owner to ask for details about the station itself. What measurements should I ask them for?
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1answer
214 views

How to determine power from emitted light using a photodiode?

I have a project that involves detecting blue light (400nm-490nm) from Cherenkov radiation to find the power that is being generated by the reactor. I understand the photodiode will give me a leakage ...