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92 Threads found on edaboard.com: Insertion Loss Filter
I need some specification standard of WiFi and WiMAX bandpass filter such as insertion loss,return loss,out of band, ripple....... How can I find them?
In terms of insertion loss, lower Er is better because your tracks will be wider and therefore lower conductor loss. That is, 2.2 is better.
Hi, is there a way to enter properties of a real filter to VSS's filter model. Currently i choose one model(chebyshew,butterworth, eliptic etc..) and trying to match it's properties with the real one's. It takes a long time. I want to enter insertion loss at different frequencies.
3 pin ceramic resonators are common in low cost Rx radios for the IF filter at 10.7MHz and LO = 28MHz+10.7MHz for low leakage of LO and low insertion loss of BPF. This allows lower noise floor and lower injection required to stimulate mixing and improved image rejecti
Is related to loaded-Q tuning of the resonators part of the filter. This is the reason that sometime a multi-pole filter can have less inband insertion loss (S21), than let's say a 3-pole filter. The resonators part of the multi-pole filter could get higher Q because they are less "loaded" (...)
Actually the total filter insertion loss is the sum of the: loss due to the impedance mismatch at the filter input, the second is due to the mismatch at the filter output, and the third is due to the dissipative loss on each reactive element. One think have always to (...)
Hello, I'm designing a sensor analog chain ending to an ADC from TI (ADS6442 : ). The Drive CIrcuit Requirements (p49) says : "the drive circuit may have to be designed to provide a low insertion loss over the desired frequency range and matched impedance to the source. While doing this, the
hello I need help in my sss filter which operate at 1.8GHz. I am supposed to meet the spec of -20dB return loss and small insertion loss. I use RT Duroid 3010 as substrate and use transmission line as feeding line. I did study from many examples on designing using HFSS, but seems like my design is having problem. my s21 (...)
Because this is a Spectrum Analyzer application, that requires high front-end linearity, I would go even further with the design. SBL, SRA, and almost all the diode mixers are very sensitive to the IF port termination, is good to place a diplexer at the IF port, before the high-pass filter. The attached one provides low insertion loss and (...)
I require high selectivity filter. A bandwidth of 5MHz, passband insertion loss<= -10 dB, stopband attenuation at +-20MHz >=40dB. LC filter cannot provide these specifications. The specification involves a higher order filter, independent of the used technology. In case of an active (...)
Yes you can do it this filter with lumped elements but the insertion loss will be very high due to high selectivity requirements because you will have to use many lossy components. Instead, if you can design a helical/rod EM coupled filter in a good cavity, the insertion (...)
I would put in a bandpass filter, broadband enough so it had low insertion loss. If there are not too many jamming signals, a simple lowpass might work too. After that, a passive limiter makes sense.
A big number in impedance ratio was one of the things I did mention in the first row. 1:50 is rather big in my RF-world as any losses in first part of matching network, will be multiplied with same ratio as remaining network impedance ratio. Typical insertion loss at these frequencies is handheld low power things. They are numerical the most
What are your specifications ?? Midband insertion loss, Out-of-band Rejection@Offset frequency, Lumped or Distributed, Implementing Space ( small or no limit)..
If you use this substrate with that bandwidth, insertion loss will be very high. Consider higher permitivity..
This should be easy to fine just g00gle. But you should do a quick line up to see if you can get there with one amp. For example Assume the following: InPut Pwr = ? (What do you need to have as your I/P vs what do you have) filter insertion loss = ~3dB attenuation (-3db) (...)
hi guys i am using HFSS to design multilayer filter using LTCC technology though based on simulation i have high in-band insertion loss 8 dB i think its due to using via holes anyway what can i do to minimize the effect of that ?? thanks in advance regards
Dear all I want to model a power splitter with a datasheet. I used Hybrid90 (Ideal 90-degree Hybrid Coupler) which need these specification:(from ADS help) loss insertion loss (dB) GainBal Gain balance between output ports (dB) PhaseBal Phase balance between output ports (degree) I need it for a filter which is (...)
If you can accept the big insertion loss, you can divide and then combine two branches. If not, it is not right to just combine them. This might be misleading. If you just connect the two bandpass filters in parallel, the input matching will be bad because you will see the stopband input impedance of one filter in
hi, some professor how can i get the following formulas, the insertion loss of the single resonator:L(f)=-10log{(1+(2QL*(f-f0)/f0)^2)/(1-(QL/QU)^2)}; the insertion loss of the filter: L(f)=-10log{((1+QE/QU)^2/2kQE+kQE/2)^2+2((1+QE/QU)^2/k^2-QE^2)((f-f0)/f0)^2+4((QE/k)^2((f-f0)/f0)^4} thank you!
the insertion loss of the single resonator:L(f)=-10log{(1+(2QL*(f-f0)/f0)^2)/(1-(QL/QU)^2)}; the insertion loss of the filter: L(f)=-10log{((1+QE/QU)^2/2kQE+kQE/2)^2+2((1+QE/QU)^2/k^2-QE^2)((f-f0)/f0)^2+4((QE/k)^2((f-f0)/f0)^4}
You seem to have simulated in CST without loss, because your 0dB passband insertion loss is too ideal to be true. For narrow band filter, it is very important to include metal loss and dielectric loss in the simulation model. The differences between simulation and measured can be from (...)
Yes, for insertion loss you only need to measure S21, and thru cal is sufficient (big time savings). As far as the average in the passband, different analyzers may have different math functions built-in, but I would probably export the data and do the math in a separate program (Excel, Matlab, Mathcad, etc.). Although, if the passband is smooth,
Your 20dB insertion loss at peak is far too high. Something is wrong with your interdigital filter, probably too wide spacing between the coupled lines. These oscillators in particular were built hundreds of times, mostly worked from the first try. The author optimized the circuit and the layout for the specified transistor, so if you (...)
Hello everyone, this is my first post here, I have designed a passive tunable combline filter for cellular bands using agilent ADS and the results were high insertion loss in the lower frequency of operation. Now trying to design an active combline filter to cancel the losses. My problem is how to (...)
The insertion loss of a bandpass filter depends on many factors: 1. The quality factors of your resonators. Thicker substrate means higher Q, better dielectric means higher Q and lower conductor (copper) surface roughness means higher Q. 2. The number of poles. More poles means higher insertion loss. 3. The (...)
I thought Momentum treats 'sheet' as PEC. There are multiple models for metalization, and this does make a difference in results. So Sonnet gives ~3dB ... or 4dB when the metal is simulated with 2?m metal roughness (EDC copper) on the bottom side of the conductors. How
Hi Everyone, I need help to design a EBGS assisted micro strip dual bandpass filter using insertion loss method.I need to know about design, suitable structure and which dielectric constant will be better for this purpose. Please help me.
In ADS u have design guide template for BP ... u can use that.. First of all, u need to know the specs of the filter.. insertion loss, return loss, rejection, cut off frequency, pass band ripple, BW..
I have recently started using ADS2003, and as a part of my work have been asked to design a edge coupled bandpass filter for following specifications: pass band : 11.1 to 11.4 insertion loss 0.5 db stop band : appx 3.4 db away from 11.4 while designing the filter the physical parameters for lamda by 4 were w= 1.358 (...)
I have recently started using ADS2003, and as a part of my work have been asked to design a edge coupled bandpass filter for following specifications: pass band : 11.1 to 11.4 insertion loss 0.5 db stop band : appx 3.4 db away from 11.4 while designing the filter the physical parameters for lamda by 4 were w= 1.358 (...)
I doubt you can obtain insertion loss of 0.16 dB on a 4-pole comline filter in the frequency you specified, it would require unloaded Q of more than 8000 to meet your insertion loss. The loaded Q you calculated is just the revers of the percentage bandwidth of the filter. When people say a (...)
But this is not a Direct Conversion Receiver (DCR), because there is no frequency conversion. It is a Tuned Radio Frequency receiver (TRF). There are two cascaded front-end RF amplifiers, an X-tal BPF, and another RF amplifier followed by a detector. Myself I would place the X-tal BPF after the first RF amplifier, to don't amplify unnecessarily t
Yes, agree. filters do not have "noise figures" but instead have insertion loss. So if you have a filter driving a low noise amp, the noise figure of the total is the (amp nf) + (filter insertion loss). But, the noise figure of the amp may degrade if you are driving (...)
hello frndz, i am doing project in uwb fileter area of 3.1-10.6 ghz range and my aim is to reduce the insertion loss and improve the return loss performance . so, i have some doubts in this area. those are 1) what is the Multiple Mode Resonator and its equivalent circuit also how to calculate all the dimensions of this equivalent circuit. (...)
Something is not ok. Even if you have a high insertion loss input filter (let's say 5dB) and a poor 2dB NF LNA, you get better than 14dB system NF. Download AppCAD software, go to Signal-Systems/NoiseCalc and verify what is going wrong.
The data in the paper that you attched is from a lossless simulation, as you can see from the very ideal insertion loss in the pass band. It seems that lossless metal was used in the simulations, instead of using realistic material properties. I simulated the filter in Sonnet EM, based on the dimension (...)
Hi TUCHENG, I am not a specialist for microwave systems, however, I think both of your formulas use different kind of losses: * IL is the "insertion loss" which - more or less - is a parasitic loss due to mismatches and other unwanted effects. * In contrary, the loss parameter in the other equation (...)
I need to come up with a project for my class that can involve any of the following: •Microwave filters: filter design by the image parameter method and insertion loss methods. Maximally flat and equal-ripple prototypes, filter transformations, stepped-impedance low-pass filter, (...)
hello guys, can you help me to understand pros and cons of ''image method'' vs ''insertion loss method'' for designing a microwave filter? I have found much info about the insertion loss method, but nothing explanatory about the image method.
Little or tall people, all use LPF instead BPF because they have wider range for rejected frequencies, LPF usually don’t have parasitic resonances, usually for the same number of poles LPF has less inband insertion loss and less ripple than BPF.
Hi all, I've been playing around with HFSS and thought I'd try and model a VHF Comm Band pass filter that was described in an article 2008-Q1 I've attached the HFSS (V11) file but although it seems to give the correct filter shape there is massive insertion loss and return loss is 0db?? What have I (...)
I would buy a used one on ebay, take it apart, and learn how to manufacture it. Yes, you do need to be able to tune it after assembly. But you need to assemble it repeatably enough to get it into tuning range. Also, you have to use high Q materials and solders. Poor soldering can easily add 3 dB of insertion loss.
Hi, all, Let's consider a 50 ohm to 200 ohm impedance transformation SAW filter, and it has the insertion loss of 1dB. If it is inserted between a 50 ohm antenna and a 200 ohm LNA, will it help with the chain noise figure, or the noise figure of SAW+LNA will be better than LNA alone (refer to 50 ohm)? Please let me know your (...)
This is the all idea of tapped line, to provide an impedance transformation. So you have to tune the filter design (length, spacing, width, etc, of the resonators) in the way that at the tapped point the impedance is nearly 50 ohms, meeting in the same time all the other parameters of the filter, insertion loss, rejection, (...)
Biff44 is right. Often time it is low pass / high pass topology. You need to know (among others) your specs for how much insertion loss and reverse isolation you need. Good luck, bouchy
What it means is that if you graph the transmission, the line should be within the lighter area on the figure/graph scale. The key points are the insertion loss at the lower frequency up to the "corner" then the attenuation should drop rapidly in the vertical light area in the center of the graph and then the attenuation should be greater than the
I also deal with this kind of technical problem, how the DSL filter is quite interesting for me. (1) Impedance matching ? (2) insertion loss ?
Increase dimension of the cavitys, the bigger cavity must be reduce insertion loss.
hi, the best design method to realize the RF BPF (NOT CAVITY filterS) The specifications: Passband range: 400MHz-600MHz Passband insertion loss: < -3dB Passband Return loss: >-15dB Attenuation at 10 % away from bandwidth is around -60dB please help in getting the best design method... thank you