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# Cavity Filter Design

71 Threads found on edaboard.com: Cavity Filter Design

## Which is better for cavity filter design, Ansoft or CST?

Anyone know which is better on cavity filter design? I wonder the well-known company major in cavity filter use which,or some other software else?

## coupling coefficients in filter design

Hi friends , I am working on cavity filters for more than one year(In testing & tunning) Now I want to Know the basic design steps and softwares best worked for the above. I tried HFSS and Zealand on working filters but unable to get the response as expected. Thanks Madhu

## How to simulate full cavity filter using CST

For cavity filter design, now we only first simulate single cavity's resonance frequency, then caculate the coupling coefficient that determine the ires'width. I have seen some papers that introduce full cavity filter simulation using HFSS and CST,but I can't grasp the main idear, Can (...)

## Looking for cavity filter design

Hi all , I'm looking for the design formulas for a cavity filter . I want to build a cavity filter for 408MHz for radio astronomy purpose . The idea is to place an adjustable tube inside another tube and working with coupling loops to form a cavity filter, just like (...)

## DOS program to calculate the combline filter

Only for microstrip? not for cavity filter design?

## design microwave cavity filter with cst or hfss

hi! everybody, I have cst and hfss.I want to design a microwave cavity filter,but I don't know which is better,cst or hfss?who can give me some suggest

dear sirs, I am now tring to design dielectric filters of about 2 G.with the bandwidth of 15MHz. the dielectric resonator's dimension is 40mm*40mm*33mm.and a dielectirc disc with height of 11 and diameter of 28mm is placed in the center. A hard foam is taken as a substrate with the same heght as the disc. but as a result, four D

## waveguide filter design

I calculated the size of a TE101 mode caivty.and calculated the coupling coef between two identical cavities(2mm thick iris).then using the direct coupled method to got the size.but because the coupling coef is not very accuate so the simulated resoponse of the design is very poor.nearly cant see the filtering figure.I hope to use screws to tune

## some questions about cavity filter!

hi! I wanted to design a cavity filter.I had drafted the 3D model.(you can see the attachment of the post).First,I needed only design a fixed frequency filter.but later,my boss told me I must think more for redesigning it as a tunable filter.I planed to use a (...)

## Help me design a cavity filter

A cavity filter used the cavity to provide a resonance, determined by the resonant mode in the closed filter. I'd start by looking at 1-Coupled resonator filter design. THis is older stuff, the relevant papers are probably from the 60's. 2-Coupling energy into and out of the (...)

## round rod cavity filter design

hi, i want to design a bandpass filter with round rods can any body help me to by sending design equations completely. thanks in advance

## Cavity bandpass Filter design

hi, How to design a cavity filter? what are those waveguide cavity filters, coaxial cavity filters..... etc., if any Books for a learner to design and if any tutorials to do simulations using HFSS/CST MICROwave on this, helps a lot..... thanking (...)

## is cavity filter easy???????????

hi to all, i have to design cavity filter ............. but i dont know the info about these filters can any one guide me to do this plz thank you

## filter design: how to compensate temp drift

Dear cavity filter experts, Please discuss the soltions to improve the stability over temperature varying. Are there some commonly used solutions? thanks y99lx

## simulation of a 3D cavity filter

How many resonators do your 3D object has as a cavity filter?

## design a suitble filter for you

The first you must specific your filter to meet the system. Then seletor the type of the filter SAW,dielect,cavity,planar. the diference type of filter cause diferenc result. Third in put the orginal data,and opt,and make a yield； Verify it with the EM softwre. After you wait for tuning the filer. (...)

## Mode choosen to simulate filter in HFSS

Hi, I want to simulate a cavity filter inHFSS. Which mode should I choose :Driven or eigen mode? Thanks!

## Ask for theory/reference for waveguide cavity filter design

I want to learn how to determine the number of cavities,length/width of cavities,and width of coupling window. If you have mastered this or know where this theory can be found, please tell me! Thank you.

## Ask for help on rectangular waveguide filter design

you should use the mode-matched method to compute the parameters for your filter,it is very difficult, an other ways to design the filter is to use more cavity resonantor,it is relative easy,so it is a hard job to design the waveguide filter from a beginner

## how to extract the coupling coefficients by simulation

This will help. It is a step by step cavity filter design with an example in @nsoft HFSS

## How to design a bandstop filter

Dear sirs, I am now studying bandstop filter design using coaxial cavity.who can give me any references or devices?thanks. Liuyun

## how to design a coaxial cavity with specific reactance slope

how to design a capacitor loaded coaxial cavity with specific reactance slope and frequency?

## Has anyone designed a dual mode filter?

I have no experience from cavity dual-mode filters, only from microstrip dual-mode filters. Was convenient as remaining circuits alreade were in microstrip. I used the design below and scaled it to 2.3 GHz. Works fine.

## relationship between cavity volume and power tolerance

Someone can tell me the relationship between cavity volume and power tolerance when design a cavity filter? thanks very much !

## Question about combline cavity diplexer design

Hi I am designing a combline cavity diplexer and I wonder if there is a way to align "tune" the resonators, and can I use power combiner at the output to see the response for the two filter at the same time I apriciate any help Cheers

## HELP:how to design diplexers?

i will use two combline(coaxial cavity) filter,but i donot konw how to design the input port thanks for khouly's help krose

i made a rec cavity in HFSS and had the same problem. there can be 2 reasons, 1; ur not analyzing before seeing results, 2; there might be an error in the 3D design, not in dimensions but the way you made the fig.

## help me to give some advice to design high power filter

who can help me to give some advice to design high power cavity filter, thanks

## circuit for Bandpass filter

Hi, what specification of this filter that you want? what implementation you want it: cavity, lumped, transmision line???? David

## RF filter design tips???

I saw that page, Is there any new links or better pdf about helical and cavity filters?

## software to design cavity bandpass filters and duplexers

Hi, does anyone know of an appropriate software to simulate cavity filter and cavity duplexer response. I am curious if the software can tell us the cavity diameter and spacing in case of interdigital and combline cavity filters

## Microstrip or cavity filters for C-band

Depend on the power level. cavity filter will allow more power handling. However for low frequency does not matter, microstrip size is prohibited(f~164MHz for example)

## design of this filter plz

hi to all any one the design for the cavity filter as shown in figure if any one is there plz ans this? 'thank you

## Looking for a waveguide filter book (illustrating design of)

Hi, I am interested in learning more about designing a microwave cavity filter that utilizes a structure quite similar to a commonly found waveguide band pass filter using shunt inductance coupling (to couple resonators) (see and ). However, the structure I am interested in also contains a post centered between the (...)

## Cavity and Interdigital filter

I need to design a 450MHz,with 20MHZ 3db bandwidth BPF. I want to use cavity or interdigital filter,please help on design and mechanical sizes of the structure. Is there any easy software or calculator for design this filter?

## Design a helical cavity filter

im run the helical cavity bandpass filter for very narrow bandwidth filter 0.5MHz, and center frequency is 30 or 90 MHz, I have done lots research on this topic, but few materials can be found, and this technology is being used for very long time, but this type of filter does not have any synthesis software compare to LC (...)

## bandpass filter 600-1000MHz

Lumped elements method probably is cheaper but the best performance that you can get is to use a cavity filter.

You are looking for a 1% bandwidth of central frequency. This is almost impossible to do using microstrip components. Microstrip filters generally have 10% up to 25% bandwidth of central frequency. The only way to realize this filter is to use cavity topology. This can be tunable, but having big dimensions.

## helical filter design without iris

Try this software for single cavity design: The coupling between resonators without iris may give a filter response of bandwidth about 10-20%. For narrower bandwidth, you may try increasing the helix distance. For even wider bandwidth, there might be a limit for the input coupling. To what degree, I think you have to do s

## interdigital cavity filter synthesis

Hi, I am trying to design an interdigital bandpass filter with round rods and tried two synthesis sofwares 1- An excel software in rfshop.com 2- intfil.exe both of them are free on the internet However, when i used the results of these sofwares in CST, the simulation results are very very bad. Is there a limit for the frequency range of t

## HFSS interdigital Cavity Filter Question

Hello, i am trying to simulate a cavity interdigital bandpass filter.But there are several errors.And i couldnt solve them.The error messages are as follows:"firstelement and Box1 intersect","secondelement and Box1 intersect". How can i solve this problem?Box1 is a box that is air.and i am trying to feed the filter by (...)

## Cavity filter - how to calculate coupling factors from S-parameter simulation?

Hello everyone, I am trying to design combline cavity filters according to Puglia 1 Puglia 2. I can calculate lowpass g-goefficients and coupling factors for my

## Req: Model for Dielectric Filter

Dielectric Resonator filters (DRF's) has a complex resonator field coupling to the cavity, coupling lines, apertures, etc. There are design guidelines in text books, but very difficult to model and simulate without a true 3D electromagnetic simulator. We have successfully used C/S/T M/W/S 4.1 for this job. Measurements (at 19 GHz) on a (...)

## Microwave absorber design

HI, I use absorber before. As long as all the side walls of the cavity is deposited with absorber, your circuit will work fine. Since your housing is quite small, you can consider higher quality absorber, request free sample from Cuming Microwave

## This filter is possible or impossibe! Please, let me know

Many technologies exists, one of the less lossy is the HTS , but practically, for less exotic tecnologies like lumped, tubolar, cavity etc, i suggest to look to the market. For example, on K&L catalog, you'll find a parameter called LOSS FACTOR LF= Loss(dB) * BW% / (N+0.5) BW% = 3 dB bandwidth expressed in percent with respect central fr

## dual mode dielectric filter

1,I have seen in a paper describes triple mode resonator with a cubic dielectric puck loaded.and a chamfer is introduce to realize the intra-cavity coupling?But I dont know how to design the size of the chamfer,who will give me any advice?

## Tunable filter module in the VHF band

cavity filters are quite simple to do and works fine in VHF. In the net are a lot designs. I have an old folder with a design but I can´t find. As soon as I find it I´ll upload. I did one for 144 Mhz is was big but works fine.

## Help me about design cavity filter!THX!!!!

f0=3170MHz BW=20MHz >=65dB@f0?70MHz that is >=65dB@3110MHz and @3240z vswr<=1.5 ripple<=0.5dB IL<=1.5dB pls help me ,thx very much !!!

## Looking for a circuit for a bandpass filter

Hi, what specification of this filter that you want? what implementation you want it: cavity, lumped, transmision line???? David

## What programs to use for designing microwave filters with cavities?

Dear Forum, The compnay i work for, it's now expand and need to design microwave filters with cavitys. They asked me to make a market search. I have not found any program which calculate the cavities. Also we need a packet to simulate if that is possible before we order it. We tried the concerto which is very easy to work with and has (...)