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Uses coaxial ceramic resonators.

Advantages:

• May achieve higher "Q" than a lumped element filter in a comparable package
• Extremely temperature stable
• Good choice where bandwidth doesn't exceed 10%
  

Combline filters replace the inductors in a lumped element filter with distributed inductors or lengths of transmission line leaving the capacitors lumped, although distributed capacitance is sometimes used.

Advantages:

• High "Q" factors can be obtained (3500)
• Small size can be traded off with "Q"
  
• Bandwidths from 3% to 50% can be obtained
• Designs cover 500 MHz to 26.5 GHz
  

(Can be one or two characters)
/A Amplitude Matched
/B Bessel Response
/C Contiguous Multiplexer
/D Delay Matched
/E Equiripple Bandwidth
/H Half dB Bandwidth
/N Non-Contiguous Multiplexer
/P Phase Matched
/Q High Power Requirements
/R K&L Reflex
/T Three dB Bandwidth
/U One dB Bandwidth
/W Butterworth Response
/X Special 

K&L filters are available in bandpass, lowpass, bandreject and highpass designs. When specifying your filter needs, be sure to supply all pertinent passband and stopband information. To achieve the best results, additional specifications such as phase, group delay, power, size, environmental, and mechanical requirements should be supplied.

Interdigital filters are entirely distributed networks consisting of an array of short circuit quarter wavelength lines.

Advantages:

• High "Q" factors can be obtained (5500)
• Small size can be traded off with "Q"
• Bandwidths from 5% to 66% can be obtained
• Designs cover 500 MHz to 26 GHz
  

The elements in the filter are lumped (i.e. concentrated over a small area). The inductors are coils of wire wound around cylindrical formers, and the capacitors are parallel plate chips or simpler portions of substrate material. 

Four character medium and topology code:
_ Z _ _ Diplexer
_ M _ _ 

Multiplexers
In a multiplexer the second character in the medium and topology code is replaced by a Z in the case of a diplexer and by M in case of any other multiplexer. The lowest and highest passband frequencies are specified in the part number.

Multiplexers
7FZ30-3000/TC4500-O This diplexer consists of 2 seven-section combline filters in a 30 series package. The lower channel bandedge is at 3000 MHz and the channels are contiguous passing up to 4500 MHz. All three connectors are SMA female. 

_ Z _ _ Diplexer
_ M _ _ Multiplexer "1" is used as 3rd character in medium topology code
_ _ 1 _ 

9B111-500/H50-O/O
9 section Chebyshev filter in a one and a quarter inch tubular, center frequency 500 MHz with a 0.5 dB bandwidth of 50 MHz and SMA female connectors on both ends.

6C42-1000/UW30-O/OP
6 section Butterworth cavity filter in a 42 series package, center frequency 1000 MHz, 1 dB bandwidth 30 MHz, SMA female on input and SMA male on the output.

9ED30-4000/U2000-N/NP
9 section interdigital filter in a 30 series package, center frequency of 4000 MHz, its 1 dB bandwidth is 2000 MHz and it has N-type connectors, input female and output male.

6IB33-2500/TA212-O/O
6 section IB filter, tank circuit with tubular end sections in an IB package, center frequency 2500 MHz with a 3 dB bandwidth of 212 MHz, SMA female connectors on both ends, amplitude matching is specified.

3MC10-500/TD45-O/OP
3 section Bessel miniature cavity filter, center frequency of 500 MHz with a 3 dB bandwidth of 45 MHz. Delay matching is specified and the connectors are SMA female on input and SMA male on the output. 

These filters are also entirely distributed, consisting of both series and shunt transmission line sections.

Advantages:

• Very selective devices are standard
• Designs cover 100 MHz to 40 GHz
  

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Waveguide filters consist of half wavelength cavities separated by inductive irises.

Advantages:

• Extremely high "Q" factor can be realized
• Very selective devices can be made
• Designs cover 1 GHz to 40 GHz