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427 Threads found on Antenna Circuit
Hi Again, I tried to find out how the last problem occurring and I see when I use small antenna this is happening much more and it depend to position of antenna too. So it seems it is RF effect on circuit. In the circuit there is polygon, is there any other ideas to decrease this effect ? BR,
hi, i must design multifunctional SRR-loaded printed monopole antenna. how can i add switches on SRR in HFSS? like this
Your transmitter is messy, I am surprised it works. Usually a 100MHz transmitter circuit is neat and tidy. The distance is increased when the antennas focus the radio beam. A Yagi antenna has good focussing.
That all looks good to me. You have the fixed regulators wired correctly. Watch out for the antenna connection on the module, at 5.7GHz the track width and spacing are critical if you want most output to reach the antenna. Brian.
With the EXPLOSION of 3d printing, has anyone come across a LOW COST way to fabricate microwave components for prototyping? I mean a method of making precision tolerance microstrip on FR4 or Duroid for maybe under $500? Or a way of making waveguide and antenna horn type components from sintered metals for maybe under $1000? It seems that
Hello guys! How are you? Well, I´m working with RFID from Texas Instruments. I am starting a new project that I want use 2 antennas for the same electronic. Can I use a mux between antenna and electronic? What are the parameters that I need look for make a best choice about mux? Tnx very much! PS: My RFID signal have 134.2KHz with
Dear guys, I want to estimate the effect of bondpad to my circuit's performance. I think the dominant effect is shunt parasitic capacitance. I used HFSS to simulate antenna, so I tried to simulate parasitic capacitance of bondpad but I don't know is my setting correct or not? When I extended the boundary, the result was changed! Thus how can I k
Hi I`m trying to add RFID to my project and due to constrained memory and cost I decided to use classic 125kHz RFID. Instead of building all the analog circuitry I use HTRC110 interfaced with PIC32. I calculated resonant frequency for both antennas ( 700uH and 13uF ) and tried them both in circuit implemented according to NXP's AN98080. (...)
Hello all. I don't have much training in transmission lines so my question is pretty general. I've been tasked with creating a coplanar antenna on top of a small silicon cantilever which will just be held in air, thus the need for a single plane design. The goal is to produce a large magnetic field at the tip of the cantilever and I was given a
The circuit will work in RF and is in use for many years especially in HF frequencies. For some examples search the net for: "XPhase - Interference reduction " The main problem of the system, like in any other multi-antenna systems, is that you need good antenna correlation (or isolation between antennas) which sometime is (...)
Another possible solution.. If you know the components' values and part numbers, you can build the same circuit on a seperate PCB and measure it standalone. Then measure the input impedance of the circuit at the antenna input after that extract the s-parameters of the first copied circuit from these second measured (...)
Dear all I have made mirostrip antenna with shorting circuit techniques to reduce the size of the antenna, but it produced very little bandwidth. so T replaced the shorting pin with 1 ohm chip resistor. when I simulate in software CST Microwave, Realized gain antenna is about-32dB. Why the value of this gain is negative? (...)
Hi tony, I use Series 2000 Micro Reader by Texas Instruments. link: When I said coil, I meant antenna, sorry for this. The Microreader need a 47uH antenna to work, and I did it, but now, I need use a antenna of 49 uH, for this I want use other passive components to ma
parts i have : antenna wire,magnetic wire,toroid core, 23 mhz crysrtal oscillator,some transistors ,resistors,capacitors.... i want to design circuit to simply on and off the led by radio waves. could u sugest me simple circuit with to do this.. plzz.thank you in adavance
I'm agree with biff44. There is another resonance coming from a different source rather than antenna. A patch antenna can not present such a very sharp S11.There should be another source like an open circuit or short or something else..
Design areactive L network in order to provide impedance matching between transmission line of Zo = 300 + j60 and an antenna having impedance of 80 +j100 at the frequency of 1MHz. How do design this circuit? My professor told me that while designing L impedance matching circuit we need to make the shunt arm parallel with the one with the (...)
Hello everyone Can anyone please help me designing a balun/transformer to match a receiver loop impedance of 4ohms to a value of 50ohms (coaxial cable). I have designed a multi-turn antenna. It is working in the range of 3-30khz. Please help.:?:
Can you show the load impedance curve? Maybe the problem is resonant load (e.g. antenna with insufficient bandwidth). In this case it's probably not possible to achieve a better matching. Too much delay between load and matching network can be a problem as well.
Hi all! I have to design a planar antenna and microwave power amplifier integrated on a "single substrate". My design frequency is 2.45 GHz. Which substrate would be better: Fr4 Epoxy (4.4) or Rogers RT Duroid 5880 (2.2) ?? Your kind help is highly regarded. :)
Hello Forum, This is my first post here. I looking for help with Designing the antenna feed circuit for my GSM Unit. I want make GSM 2G+ mobile phone. I use Calvus, P/N A10340, Penta-band SMD antenna. It is my first project with GSM device and do not know how to calculate 50 Ohm impedance feed. Can some one can help me? Send working (...)
Hello !!! I have to make a project and one of my tasks is, to calculate the open voltage of the antenna ! If we can say that the equivalent circuit of an antenna in transmit mode is a Voltage source with a Zantenna in a given frequency, i undertand that if i have a Zload=0. this is the open voltage (...)
David, The "N" simply indicates the type of package-DIP, in your case. Your circuit may very well be oscillating, but not a frequency that upsets your TV or radio. And I think you might want to connect your antenna (whatever it is) to pin 2 rather than where you have it, as it will affect your frequency since it's connected to the capacitor.
Thank you for your answer. when you have read my post, then you know, that I already use sonnet. Feko is new to me. My question was: Can I add some matching circuits into the feeding line from my antenna and then simulate the whole antenna - solution including the matching circuit? Simulate your (...)
Yes, LC is the only part that select which station that is received. It would not be stable or selective if antenna, with frequency depending undefined and unstable impedance load would be a dominant part of the tuning circuit. Triode load is low and almost constant. It is possible that antenna is better matched but it depends on how (...)
what do you want to detect (1 mV, 100 mV, 2 V, etc)? Whether you will measure something depends on what you use as antenna and the strength of the field. BAT85 is not the best Schottky diode for a simple UHF detector. Try to find a schottky diode with less capacitance. A very nice detector diode is BAT62 as it has a good breakdown voltage and
How to get equivalent circuit of designed antenna in HFSS.? For simple patch we could draw .But problem arises with fractal geometry.Also How to get values of L&C
I presume you are trying something like RF energy harvesting or a passive RFID tag. We would normally expect that the rectifier circuit is impedance matched to the RF source (receiver antenna or coil). In this case multiple rectifiers can't increase the output voltage.
Look at CC1101 and his
antenna is the essential part of a receiver.
To get a 220 MHz notch with 1.5% bandwidth you need a Q factor of the resonator greater than about 2500, which is almost impossible to be done with standard coax cables. You need a cavity notch, or a Heliax Notcher circuit as is described below:
i have a slot line antenna. Can anyone tell me how to extract its distributed components L and C?? .... or i need to know how to circuit model that using L and C.? You need to start with a circuit model, then the S, Y parameters can help you calculate the circuit components, based on the fit of which you can modify y
Hello, I consider the following configuration for the array: two waveguide shunt resonant slotted subarrays of N=8 slots, placed longitudinally. I.e., both subarrays share the wall for the short circuit condition, and both subarrays are edge feeded. There is a symmetry plan across the short circuit wall regarding slots positions. Through EM s
Hi, I have a question about the circuit in the picture. It's part of a CW receiver. The Rx_In signal comes from the antenna (low pass filtered) and the output goes to a BPF centered in the receiving frequency and then the signal it's mixed and demodulated. I don't understand the part of the circuit below, I think that the function of the (...)
Check the nRF24L01 datasheet, it has some sample PCB design and circuit with different type of antenna. range is not only depend on antenna. if you have to increase the range it requires some additional chip for power boosting . Search the net, you will get that also. LNA and supporting chip design also available.
Can someone theoretically explain why capacitive loading decrease electric length and inductive loading increase electric length? Are there any papers and books to explain this? Thanks in advance.97893
hi i am a final year student.. i want to make a gsm signal signal booster antenna, for which i have to make an amplifier circuit to amplify the incoming signal,. i also need help in antenna design,, any help will be highly appreciated,,,,
Hello Folks, I am designing a rectifier circuit using Cadence 180nm technology. I am using a sine source which acts as antenna voltage. I have given the amplitude as 1.02V. Without any impedance matching, I connected the antenna source to the rectifier circuit along with 10kohm load resistance. I measured the impedance (...)
hello friends i am doing research project in reconfigurable antenna using hfss. so if possible can anyone tell me how to implement pin diode in hfss or any other software?
This circuit of the site: assume that antenna impedance = 50 ohm If I ignore the 8-turns ferrite coil, then tried to calculate the antenna impedance that seen looking into point
Hello all, I have a wire tracer that transmits a signal on about 83khz. The antenna (a small wand) is missing. The company does not support the unit any longer and I have been unable to find a replacement anywhere. I have made some antennas on my own for my HAM equipment in the past but never for anything down that low and never for anything th
u cant use the same antenna for tx & rx .. the feedback will destroy the rx circuit as it is not meant to receive level of signal the tx gives out... regarding designing the ae.. i need to go home and study AGAIN... sorry... try a ham radio forum... they would give expert help
Hi all I am attaching my S11 for patch antenna measured from VNA how can I draw an equivalent model (RLC ) can any one guide URGENT NOT much time left reply soon Kartik
hi all help me in solving this how to draw an equivalent circuit model of patch antenna(RLC) in ADS can u tell step wise process from any example in ads c kartik
Hello, I assume you are familiar with transmission line resonators and their RLC representation. Do an Internet search on patch antenna transmission line model (without quotes). Once you have a transmission line model, you can convert that to a RLC model (over narrow frequency range). You may narrow down your search by adding LC or LCR.
Assuming you have a single element antenna (half or quarter wave patch, half wave dipole, quarter wave monopole, PIFA, etc), it can be done. Such antennas behave more or less as a series or parallel resonant circuit around the center frequency. If your antenna is matched (so S11 goes through the center of the Smith (...)
Although I basically agree with the previous comments about the circuit, I think the bread board design in the original link might explain why the circuit exposes a certain succeptebility to GSM transmitters despite of RF-wise shorted OP inputs, simply through rectifying the RF picked up by the "antenna" wires connecting the components. The (...)
I?m developing a simple, five-frequency superhetrodyne receiver to operate between 2.5 MHz to 20 MHz in which the local oscillator crystals and whip antenna tuning circuits are selected (switched) using diodes. Here?s the problem: The whip tuning circuit is comprised of a single variable capacitor with five fixed-valu
Clarification of terms. you say "dipoles are λ/2". At which frequency? How do you measure "mutial impedance" of antennas? In network analysis, mutual impedance involves a driving current source and open circuit voltage measurement, which is hard to implement in RF frequency range.
for the leaky wave antenna i have calculated circuit Lr, cl, LL, CR values based on dispersion diagram and blochs diagram. I want to model a 3-d simulation based on these CRLH values. I am having a hard time doing that. It would be great of someone could assist me in how to extract Lr, cl, LL, CR from a base 3-d model I simulate. then I could u
There's no simple equivalent circuit representing the wideband behaviour (resonances at n*λ/4). Around the λ/4 resonance, a series RLC circuit with R representing the radiation resistance is the best fit. P.S.: To elaborate a bit, you get parallel RLC behaviour around λ/2, series around 3λ/4 and so on. Resonance Q depends on