3 dB Bandwidth Tables

Click Here for Table

Ceramic

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

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

Explanation of Supplemental Codes

(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 

Explanation of Topology Codes

LP/HP/BP BP
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
  9- Unspecified

Filter Structures

 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

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

 

Lumped Component

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. 

Multiplexer

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

Multiplexers

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. 

Special Packaging

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

Specific Examples

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. 

Suspended Substrate Stripline (S.S.S.)

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

 

Testing and Environmental Capabilities

Click Here for Table

Topology vs. Frequency Range - Bandpass

Topology vs. Frequency Range - Bandpass

Topology vs. Frequency Range - Dual Band Duplexers

Frequency Range Receive Transmit
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

Topology vs. Frequency Range - Dual Band Duplexers

Frequency Range Receive Transmit
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

Topology vs. Frequency Range - Highpass

Topology vs. Frequency Range - Highpass

Topology vs. Frequency Range - Lowpass

Topology vs. Frequency Range - Lowpass

Topology vs. Frequency Range - Notch Filters

Topology vs. Frequency Range - Notch Filters

Topology vs. Frequency Range - Receive Filters

Frequency Range Receive
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

Topology vs. Frequency Range - Transmit Filters

Frequency Range Transmit
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

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