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Tunable Bandpass Filter 500~700MHz - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


lna
 Post subject: Tunable Bandpass filter 500~700MHz
Posted: Mon Dec 21, 2009 2:57 pm 
 
Captain

Joined: Mon May 04, 2009 6:47 pm
Posts: 22
I'm looking for tunable RF bandpass filters for a 500MHz~700MHz radio. Besides K&L, is there any other vendors making this? Thanks.


 
   
 
Alberto
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Wed Dec 23, 2009 6:25 pm 
 
Captain

Joined: Sun Oct 04, 2009 5:17 pm
Posts: 6
I think you can have a look at the pole-zero and ewings products.


 
   
 
lna
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Tue Jan 05, 2010 1:12 pm 
 
Captain

Joined: Mon May 04, 2009 6:47 pm
Posts: 22
Looks like Pole Zero 's products are for frequency hopping radio. Not sure about its price I believe it's quite high and not necessarily for my project.

Can you give details of Ewings? Googled unsucessful.


 
   
 
abhityagi85
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Thu Jan 14, 2010 3:05 am 
 
Lieutenant

Joined: Thu Jan 14, 2010 2:57 am
Posts: 4
you can design yourself a good filter using mems or using pin diodes.

Why 2 waste money, just do sm rnd

even ieee papers already have mentioned some filters but i remember their insertion loss wass abt 2 db.


 
   
 
karthik
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Sat Jan 16, 2010 2:24 pm 
 
Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 34
You can check Lorch microwave or Lark Engineering as well

karthik


 
   
 
fred47
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Fri Jan 22, 2010 11:28 pm 
 
General
 

Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
What sort of specifications do you need?

Passband Bandwidth
Stopband Bandwidth
Passband ripple
Stopband attenuation
Tuning speed
Noise level
Power level

would all be important.

Good Luck!


 
   
 
abhityagi85
 Post subject: Re: Tunable Bandpass filter 500~700MHz
Posted: Tue Jul 13, 2010 3:15 pm 
 
Lieutenant

Joined: Thu Jan 14, 2010 2:57 am
Posts: 4
there are a lot of good papers for tunable filters. the range and bandwidth you mentioned is esily covered by a lot of papers. try searching at least ieee.





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