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Please anybody suggest how to represent the physical size of the microstrip antenna in terms of guided wavelength (Lambda g) and in terms of free space wavelength( Lambda zero). Please provide the steps to calculate the same. If total build-up area is (50??40??1.6) mm, resonating frequency is 16 GHz and dielectric constant is 4.4.
Hi all, I am need of Multimode Fibre optics cable which have to pass the wavelength 100nm to 5000nm. Please let us know. Regards, V. Prakash Vetal / India
Hi! I just want to ask if is it ok to use a different wavelength when testing a fiber optic cable used for transmission line or for OPGW? For example I am using a singlemode fiber with 1550nm wavelength, is it ok if I will use 1310nm wavelength for testing?
Hi, I'm creating two circuits using ADS for the frequency range 1-100MHz. The circuits will be separated by a 10m coaxial cable. Is it appropriate to model this cable using distributed parameters? I am concerned about the frequency response of the lumped component circuits either side of the cable for the lower frequencies in this range where th
I need the explanation of the attached diagram. What is the working principle ? What is the the delay block? How delay is achieved ? The diagram is taken from the
hi guys, how silkscreen over traces on pcb will cause impedance discontinuities...? thanks.
Hi, I have these questions about the mask fabrication or mask design. Let's say we have already a layout of an OpAmp or a (simple) processor we want to fabricate complete with the pads. my questions: 1. is the pattern in the layout the same with the pattern in the mask? 2. There is this term in Lithography called Resolution Enhancem
ultraviolet exposure device i built few months ago. it is controled by an arduino pro mini and has a 7 segment display to show the set and remaining exposure time. it uses ultraviolet leds(49 total)bought cheap from ebay. you can wire the arduino and the rest components using the diagram below.this way i made it can connect any common ca
I need your help, i am designing an annular slot waveguide antenna in hfss, i want To excite it but waveport, for creating slot admitance plot the port should be de embedded, and the refrence should be middle of slot, my issue is that when i define a distance the hfss doesnt understand that my structure is curved and draw the vector straightforward
Hello everyone: I recently started to study ANSYS HFSS because of my research needs. At first, my professor asked me to draw a 50-meter-long boat and set a frequency of 5MHz to measure the radar cross section of the ship. There was no problem in this part. And then my professor asked me to change the frequency to 500MHz and do the test again.
Hi all, IĀ?m designing an antenna which is working in the water.How can I modelling it in hfss if an antenna is imerged in water?Should I change the air box into water box?And will the size of it change? Many thanks
Hello all, I am new to transmission line theory. I am reading Microwave Engineering by David M. Pozar. He mentions: "The key difference between circuit theory and transmission line theory is the electrical size. Circuit analysis assumes that the physical dimensions of the network are much smaller that the electrical wavelength, while transmis
I am building a 2.4 GHz LNA (2 layers), I want to be able to use the maximum amount of solder to connect a larger end-launch SMA to my PCB that includes the FR-4 and top and bottom layer of copper ( ). The smallest SMA fitting I can find is 0.032''(0.813mm) and I want to attach this to my 0.4mm PCB board. Due to th
there are many specifications needed when I get a quote from a PCB manufacturer, but I don't know which materials are important to have and not have when getting a 2.4 GHz LNA manufactured. A few things specified are for example silkscreen and solder mask, should I leave out those materials, could they damage the performance of a 2.4 GHz LNA? I use
Hi I have designed a simple 5th order elliptic bandpass filters. I'm using lumped components, however, I would like to convert these lumped elements into distributed elements. I'm having trouble doing that. I've tried using kuroda's identities without success. I included a picture of the design using lumped components in ADS. This is giving me a
i wonder if length of wilkinson divider. each of stripline length is same? ex) 40Mhz frequency,c=λf thus λ/4=1875 mm wilkinson have One Input port and 2 Output port. then each of 2 output stripline is 1875mm, right? let see the Photo145511
Do SMT component leads have to be the same width as the microstrip transmission line at 2.4 GHz?
I'm designing a Butterworth microstrip bandpass filter, and I have calculated its order by using Bilinear method and I got it as 31st order. The frequency band is from 27.5 GHz to 31.225 GHz, and I have tried to simulate it on ADS by using cascading method (added 10th order 3 times with 1st order) but I'm getting unexpected results for insertion an
I've often been told by RF users that TX antenna length was more critical than RX antenna length. Being a wireless microphone users I've noticed that companies can use the same RX antenna for a wider bandwidth than for Tx's... Can anyone point out some theory behind it? Thanks guys, Simon
I am designing a 2.4 GHz pre-amp, is it required to have 50-ohm transmission lines (microstrip I'm guessing) at the nodes of the circuit? or will regular copper work? should I put components back to back with each other, or put 50-ohm transmission line in between? or could I just use a regular multipurpose pcb board and solder the components togeth