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Assume fine engineering, with suitable shaft encoders good to about 300 milli-arc seconds (22 or 24bits for a circle), and servo-positioning systems that will point to (estimated) 0.02 degrees, or maybe better. The dish would be (say) dual-shaped Cassegrain, with surfaces measured and aligned using photogrammetric kit that can show 0.1mm deviations
This is a big and interesting technology. lot of physics, optical and signal conditional topics are involved. But I need to know the theory of operation of this DTS temperature sensing technology. I've collected lot of study material regarding. Let me allow to give some points to discussion. I need to measure a hot spot temperature of a sur
I am designing LNA for GPS application (1.57GHz) using cadence virtuoso (IC616) and Spectre (MMSIM131) tool. Circuit is attached. My topology is inductive source degeneration. I am able to match the input and output of LNA to 50 Ohms input and output port respectively with S11 = -18dB and S22 = -10dB. My noise figure is 2.4dB at the frequency o
Hello everyone! I have to choose a substrate for my design, and i was wondering how do i choose its thickness, i looked around and i found a person recommending the use of a substrate of height equal to the wavelenght in the substrate/10, but at the same time i've used in previous projects substrates of 35?m thickness (0.125mil) for applications
Why should transmission lines be used at high frequencies, instead of inductors?
Dear all, I'm new of RF design, especially HFSS simulation. I'm so confused of how to really design and simulate an antenna correctly using HFSS. Please help me in these following regards: 1. Lumped port position: - I know it should be between the ground plane and the signal path. But for an IFA as attached (designed by TI, for 900Mhz), I'
I have a problem with quarter wavelength How can I realize that which line in passive filter is quarter wavelength? for example, microstrip line that is connected to varactor is the quarter wavelength?
Hi, I am simulating the interconnection between four transistors as explained in the attached pdf file. The transistor is in the form of BEC (Base Emitter Collector). In the file you will find that I made a connection between the collector and emitter through a bridge like structure (Port2, Port3, Port4 and Port5). Under the bridge, there is a
Similarly to , I am going to use FET as a varactor. To test this idea I have added FET varactor to the cut near ground vias of quarterwave "finger" resonator. S21 maximum shifted from 5GHz to 9GHz (FET biased at Vgs=-1v). Simple anal
hello everyone I am trying to simulate in CST a RFID tag antenna which should resonate at 13.56 MHz(NFC antenna) After designing it (at this stage I picked an antenna from a IEEE journal ) I have run the simulation (Time domain Solver) but the antenna impedance value does not match with the one in the IEEE journal. Think I am missing a point here
There are three main types of G.652 conventional single-mode fiber, G.653 dispersion-shifted single mode fiber and G.655 non-zero dispersion shifted fiber. The dispersion of G.652 single-mode fiber in the C band of 1530 ~ 1565nm and the L band of 1565 ~ 1625nm is large, generally 17 ~ 22psnm ? km. When the system rate reaches 2.5Gbit / s or more
Hi all, I attached a picture of the model I am working on now. I am simulating a plane wave traveling from -y to +y (blue axis), entering the bent parallel plate waveguide from the slit on the left and exit from the right, and I would like the parallel plate to extend infinitely along x (green axis), so I can have realistic low-frequency TM mode
Hi, May I know if it is possible to convert 4 port Quad Hybrid coupler to 2 ports. I mean can we combine, Port 1 and Port 4 as "input port", Port 2 and Port 3 as "output port"? If yes, may I know how the output looks like or how the circuit behaves as? Thanks.
I want to design a circuit which can be used to perform a 90-degree phase to incoming 490 MHz signals. Can I use Lattice phase equalizer for this purpose? If so how can I do the calculations? The example in Wikipedia not helping me. Other methods will also help.
Hi, I measured the sound pressure levels at different distances using hydrophone as a receiver. Now I want to know where the transmission loss due to spreading is spherical, cylindrical or between the two from the measured data. My data is in volts which can be converted to Pressure using Receive Sensitivity of the hydrophone. My question
Hi, I am using ADS 2016 and to reduce the time taken for each simulation I have reduced the Mesh Density (cell/wavelength) to 5 and the solver compression level to "Reduced". Do these changes anyhow distort the radiation pattern I get as an outcome of my experiment? I can observe from the figure below that I have grating lobes and to reduce th
Hi to all, I work on a Photoplethysmography (PPG) Project with a customised Optoelectronic Sensor to monitor vital signs where I acquire the signals (PPG + Accelerometer) from the sensor to a customised board for all the necessary analogue signal processing and through DAQs to LabVIEW for further processing to perform multi-channel Photoplethys
Hi, I would like to build a microcontroller set up to recieve an input from amazon echo and output in the form of a set of an infrared signals. So that I can control the various infrared controlled devices in my house. I am an amateur so I would appreciate any and all advice on how to go about this, thanks.
Hello, I have questions to the two attached presentation slides. Slide 1: Why is C band antenna diameter much larger than L, Ku and Ka ones? Slide 2: It is included that antennas for TDMA are greater than for spreading spectrum. As far as I know different antennas have different patterns, but why do transmission modes play a role? Could
please suggest any UART to fiberoptic converter onboard IC or uart to fiber optic converter.:thinker: