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Quarter Wavelength

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There's probe bandwidth and there's channel bandwidth. Probe BW is lower as far as I've seen (because what's the use of more BW than the 'scope front end can pass?). 500pS risetime is (if you call it a quarter cycle) 500MHz (-ish) and you can find passive probes of about this range. The idea of using 50-ohm cable and a well constructed p
I want to design an underwater optical communication system with high speed and bandwidth to show the effects of absorption, scattering and turbulence. I need ideas on the circuit design for the transmitter and receiver. I would also need to simulate it on Optisystem and Matlab. I need ideas on how to simulate the processes on these programs. Thank
I know the "quarter wave" LUT implementation.... but quarter wave means 4 x 90. How does the 45 table work? quarter wave is 90 degree, thus 32 points per 90 degree. 45 degree table makes no sense for sine LUT. Interpolation error with 32 point table is already very small. There's no application mentioned in this thread, thus
Hello. Well after the 3rd time getting hit at work, this last time was major damage... of course no one said anything. I suspect that the issue is parking. The parking lot is a crappy design. Anyways, I built a bull bar for the rear bumper (its a truck) but I need some type of proximity device that will cover the sides. Especially the rear quarter
Hello all, I have a question regarding two patch antenna array. does the distance between the patches varies the gain? (they are separated with at least lambda/2 so neglect coupling) I think that it does not, since the far field is composed of two elements: 1. Element pattern - does not change 2. Array factor - does not change at the max sinc
I found all the LED diode have a minimal forward voltage of 1.7V. Anyone knows that whether there are some LED diode with forward voltage less than 1V, and the forward current is less than 20mA? Thank you.
What happens when a CO2 gas molecule in the atmosphere absorbs a photon of infrared radiation which has been emitted by the Earth?s surface? What about photons that are coming in from the Sun? As far as I can see, incoming photos would also collide with some of the CO2 molecules. So why does more heat come in than goes out? Any assist
hi I need some design application notes for RFID coils. Can i simulate coil in ADS or HFSS etc. Is there any example available for ADS momentum. Is it possible to beam forming using coil arrays? Regards
I have read papers that use LIDAR-like and LIDAR-Raman systems that detect elements. I want to measure the vapor water (H2O) and N2 of trees/agriculture using Arduino and low cost elements (DIY). I am thinking of using 405 nm 500 mW laser. The problem is how can I detect the returned wavelength? What I am thinking: 1) A CCD sensor? 2)
For assessing the temperature of FETs on the PCB, how far away from the fet should this thermal camera (HT-04) be held? The spec appears to suggest 32 inches away? We do notice that the temperature reading varies as we move the camera nearer/further from the fet.
For Reduced-size branch-line and rat-race hybrids for uniplanar MMIC's , how to derive equation (2) ? and is the imaginary constant j needed in equation (1)
Any tips and/or info on how to extend life of UV lamp. Thanks in advance.
As mentioned by betwixt, always link related threads 1. I tried, it works, it makes a sine wave from a quarter of a sine wave, but no internal RAM is used, RAM Can't be used, apparently. Partial RAM tables (e.g. quarter wave) can be used,
Hello, I need verification of problem which I analyzed yersterday. Let we say, that we have simple circuit composed of transmission lines: 154760154760 As you can see, we have one simple quarter-wave TL, and two open-ended stubs at the end. I want to derive an ABCD matrix of entire circuit in e
To factor in only skin effect will underestimate the AC resistance, there's also proximity effect. Respectively, parallel connection of 4 wires will hardly achieve quarter resistance. Study the stranding scheme of litz wire to understand what's optimal. For low number of strands, twisting is O.K.
How to determine the impedance at combining node (Rcn) of doherty sub-amplifiers? Is it a standard for all DPA designs? Or depends on the design? Thanks in advanced154540 This is the standard Doherty impedance that you see. Rp=Rl' / (1 + I_carrier'/I_peaking) Where I_carrier' is the current
Hello I want to design a drive for a DFB laser transmitter. I want guidance for circuit design. And whether you have micro-code source code?
Helo all.i need a circuit which can generate a frequency of 27Mhz having a pulse rate of 800 pulses per second."Pulse on duration" should 100 micro seconds.Any one have any idea about the implementation of cicuit?Antena size should be 8cm
You can with multiple transmission line stubs. Obviously not all exactly quarter wave length. Smith chart tools like SimSmith will help you to design the matching network. As a simple approach (not necessarily the best), use one shunt stub at each side to compensate the imaginary impedance and a quarter wave series line to match the remaining re
Hello~ all:smile: I am simply finding out about the article about Which Mobile Phone Brand is More Popular in the World ,this article is about the essential quarter of the overall cell phone feature experiences report. It demonstra