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168 Threads found on Coupling Filter
I have seen rarely Microstripline structures in UHF band except some Baluns,coupling Devices and some sort of LP or HP filter circuits.Because wavelength is long and it creates such losses ( Radiation Losses,Metallic Losses,Substrate Losses).The ideal is that to use very high di-electric coefficient substrate like Alumina ( or better) in order to s
Guys, I need your help. I am designing a digitally tuned band pass filter 8-bit. Eight pin-diode capacitor circuits control the response of the filter. When diode is forward bias (Vcc 3.5V), relative capacitor parallels with the filters coupling capacitor. When diode is reverse bias (Vbb 100V), relative capacitor doesn't (...)
When a filter is designed, how does one choose whether to compare it to Chebyshev or butterworth prototype element values for coupling and Q determination? Some papers mention Butterworth element values to determine Q and coupling, while others use Chebyshev.
A decoupling capacitor is used to cancel the DC signal and only pass the AC signal from one part of the circuit to another. I have seen these being used when connecting microphone to an amplifier and also in between stages of amplifier design. How does one find out what value of capacitor to use e.g with microphones or when decoupling 2 stages o
R5, C1 and C6 are there to filter out any noise from the supply line. C6 is needed because elcos aren't very good at RF. The purpose of C6 is to ground the RF currents in the tank circuit, necessary for the feedback that makes the circuit oscillate. If you don't want to make a tap in the tank coil you can use the capacitive coupling in the first c
Hi guys, did anyone happen to have used one of these filters? 125884 Are these filter bidirectional? Both sides says LINE/LOAD, datasheet is not very helpful either. My guess is to isolate noise coupling through the ground. Pin 3 and 4 and E, should be the input. 1 & 2 the device side that gets filtered power. Is m
Hi, So I have a SAW filter that is already matched to 50 ohms input/output. From the antenna can I place a SAW filter immediately before the Low Noise Amp or will I need to place a coupling capacitor? Similarly I have another component that has a .75 V pk-pk AC signal on top of a 1.3 V DC signal. Can I use a SAW (...)
It is easy to power the LM358 because it works with a power supply that is from 3V to 32V. You do not need a "virtual ground", instead you bias the (+) input to half the supply voltage with two or three resistors and maybe a filter capacitor. Then the input, output and feedback to ground need coupling capacitors. An LED is a rectifying diode so if
Hello, I am following the design example of an interdigital filter with symmetric coupled lines as given in Microstrip filters for RF-Microwave Applications (Lancaster), page 141. I managed to calculate the characteristic impedances in even and odd-mode and, consequently, the coupling coefficients. My struggle is to calculate the spacing (...)
No, you can't do that because it would create magentic coupling between the inductors. For the low pass function, it is important that both inductors are NOT coupled.
I have MATLAB code to generate coupling Matrix for required filtering specifications. I need to realize the filter using Dielectric Resonators. Can anybody provide me with some design guide that describes the procedure to translate coupling matrix into physical filter parameters e.g, Dielectric resonators (...)
Hi, I've been following approaches by Atia and Cameron to construct a coupling matrix for a Chebyshev filter. I'm now trying to use Amari's approach to optimize the coupling matrix by minimizing the Cost Function using his Gradient approach. Can someone send me a paper or Matlab code that goes about step-by-step how to construct the (...)
They may come from wrong designed coupling factors.I mean, coupling factors between the sections are low than predicted.
Most RF filters use low-loss, high-Q resonators, while their tuning and coupling according to calculated model defines their frequency response. Any loss contributes to pass-band loss, usually not desired. There is a class of filters using lossy resonators with which a special frequency/loss response can be adjusted.
I think it's just not a filter, there is a coupling cap./ind. and an amplifier ( transistor) It seems to me..
Hello everybody, I have a question about cavity filter design, I?m new in the RF filters, while finding the coupling coefficient between two resonators I?m using eigenmode solver in CST but I dont know what does the modes mean? which mode should I choose in eigenmode solver ? and my cavity filter design consists of 6 (...)
i need some tutorial to design coaxial dielectric resonator filter. What coupling technique should be used between resonators?? how to model coaxial dielectric resonators in HFSS ?? i found some pictures of such filters on internet but coupling mechanism is not apparent. Picture is attached here for reference. Kindly help me (...)
1st check output power, and supply current. The collector should be twice the supply voltage p-p when On. Can you increase power with battery voltage? . Then fix coupling cap to antenna with a much smaller value to tune impedance to antenna and resonate at 450MHz. L2 is required for this. what is the load impedance for Saw filter?
Noise Sources: Internal Random noise in resistors and transistors Mixer noise Undesired cross-coupling noise Power supply noise External EMI, Co-channel, Adjacent channel, cosmic noise, Power Line transients etc. SNR= Signal Power/Noise Power Det
in paper {A 23.4 mW 68 dB Dynamic Range Low Band CMOS Hybrid Tracking filter for ATSC Digital TV Tuner Adopting RC and Gm-C Topology} in section IV is written :{the com-posite second-order (CSO) distortion is not important in the filter for only ATSC terrestrial standard because there exist a few channels in terrestrial application. In a