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Uses coaxial ceramic resonators.
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.
(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
|0- Special||0- Special|
|1- Chebyshev||1- Resonant Ladder|
|2- S.E.L.F.(Symmetrical Equiripple Lumped Filter)||2- Capacitively Coupled "tank"|
|3- "tank" with Tubular End Sections|
|4- Lowpass/Highpass Cascade|
|5- Lumped Tubular or "mesh"|
|6- Narrowband S.E.L.F.|
|7- Broadband S.E.L.F.|
|8- General Parameter|
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.
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 _ _
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.
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 _
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.
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.
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.
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.
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.
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|AMPS Full-Band||824-849 MHz||869-894 MHz|
|EGSM Band||880-915 MHz||925-960 MHz|
|800 MHz SMR Band||806-821 MHz||851-866 MHz|
|900 MHz SMR Band||869-901 MHz||935-940 MHz|
|DCS Full-Band||1710-1785 MHz||1805-1880 MHz|
|PCS Full-Band||1850-1910 MHz||1930-1990 MHz|
|UTMS/IMT Full-Band||1920-1980 MHz||2110-2170 MHz|
|AMPS Band||824-849 MHz||869-894 MHz|
|PCS Band||1850-1910 MHz||1930-1990 MHz|
|EGSM Band||880-915 MHz||869-894 MHz|
|DCS Band||1710-1785 MHz||1805-1880 MHz|
|UTMS/IMT Band||1920-1980 MHz||2110-2170 MHz|
|AMPS Full-Band||824-849 MHz|
|EGSM Band||880-915 MHz|
|DCS Full-Band||1710-1785 MHz|
|PCS Full-Band||1850-1910 MHz|
|UTMS/IMT Band||1920-1980 MHz|
|AMPS Full-Band||869-894 MHz|
|EGSM Band||925-960 MHz|
|DCS Full-Band||1805-1880 MHz|
|PCS Full-Band||1930-1990 MHz|
|UTMS/IMT Band||2110-2170 MHz|
Waveguide filters consist of half wavelength cavities separated by inductive irises.