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Reflow Profile

Reflow Profile


Ceramic Electrical Performance
Parameter Standard

Special

Frequency Range 400 - 3000 MHz 400 - 6000 MHz
Bandwidth 0.5 - 5% 0.1 - 25%
Number of Sections 2 - 6 2 - 6
Typical VSWR 2.0:1 <1.5:1
Power Handling 1 watt avg CONTACT FACTORY
Temperature Range -20 to + 70 degs C -55 to + 125 degs C



Filter Attenuation
The attenuation curves show the typical shape for the coaxial resonators for n=2 thru n=6. Use the formula below to determine the number of sections needed for the required attenuation.

Attenuation Example 1

Example:
Center Frequency = 1910 MHz
3 dB BW = 25 MHz
Stopband Frequency = 2000 MHz
Attenuation = > 50 dB

Attenuation Example 2

It is determined that 4 sections are required to meet >50 dB attenuation at 2,000 MHz.

 

 

Ceramic Filter Attenuation Chart


Ceramic Filter Attenuation Chart

Insertion Loss Calculation
Parameters needed:
1) Number of Sections (N
2) Typical Resonator Qu (Qu)
3) Center Frequency (Fo)
4) 3 dB Bandwidth (BW)

Ql = Fo/BW
K = Qu/Ql

The formula is as follows:
l.L. = N*.63*20*LOG10(1+(1/(K-1)))

 

  Ceramic Insertion Loss Chart

Example:
CF = 1910
3 dB BW = 25
Qu = 625 (6MM/Er 38.6)
N = 4

I.L. = 4*.63*20*LOG10(1+(1/(8.18-1)))=2.85 dB


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