QLB Series / QLH Series / QLL Series / QCB Series / QRB Series / Special Options
LUMPED ELEMENT LOWPASS FILTERS
The QLL standard lumped element product series offers a wide variety of high-performance filters. Selectable or customized features are indicated by Q Microwave´s part number convention and the definitions provided in the description table.
Q Microwave´s QLL-Series Description & Part Number Code
Description:
QLL(Field 1)M(Field 3)E(Field 4)-(Field 5)
Note that Field 2 is not used on the QLL series filters
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PARAMETER
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STANDARD FILTER SPECIFICATIONS
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FIELD DESCRIPTION
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CUSTOM PERFORMANCE
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Cutoff Frequency (Fco)
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1500 to 8000 MHz
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Field 1 (In MHz)
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3dB Bandwidth (BW3dB)
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DC to Fco
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Standard
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Rejection
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Characterized by Chebychev transfer function with 3 to 15 elements.
See plots.
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Field 3 (In Number of Elements)
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STANDARD PERFORMANCE
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Insertion Loss (I/L)
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Determined by Fc, BW3dB, and number of elements.
See plots.
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None
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Return Loss
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10 dB typical over 70% of BW3dB. See plots..
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Standard
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Characteristic Impedance
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50 Ohms
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Standard
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Input Power
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20 dBm maximum
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Standard
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ENVIRONMENTAL CAPABILITIES
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Operating Temperature
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0oC to +50oC
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Standard
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Storage Temperature
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-65oC to +125oC
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Standard
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Thermal Cycles
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25 cycles -65oC / +125oC
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Standard
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Humidity
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90%-95% relative humidity, non-condensing environment
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Standard
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MECHANICAL CONFIGURATION
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Option 1
Connectorized
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- Finish - Silver or Brass
- I/O - SMA-Female connectors
- 1.5" x 0.5" x 0.5" typ
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Field 4 (Select "CS")
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Option 2
Pins - Formed (Surface Mountable)
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- Finish - Silver or brass
- I/O - Formed Leads
- 1.5" x 0.5" x 0.5" typ
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Field 4 (Select "FS")
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Option 3
Pins - Straight
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- Finish - Silver or brass
- I/O - Formed Leads
- 1.5" x 0.5" x 0.5" typ
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Field 4 (Select "FA")
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Option 4
Microstrip
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- Finish - Silver
- I/O - Silver ribbon
- 0.5" x 0.3" x 0.3" typ
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Field 4 (Select "MS")
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Option 5
Surface Mount Technology (SMT)
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- Finish - Polyamide substrate with tin or solder finish.
- I/O - SMT
- 0.5" x 0.5" x 0.33" typ
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Field 4 (Select "SM")
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SPECIAL OPTIONS
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A variety of special options are available.
Unlimited special options may be included in Field 5.
Consult Q Microwave´s Sales Office for details.
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Field 5
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Select QLL-Series Filters
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Part Number/ Description
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Filter Type
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Fco (MHz)
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BW3dB (MHz)
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Elmt
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Rejection
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I/L (dB)
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I/O Style
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QLL500M7ECS
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LE, LPF
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500
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DC to 500
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7
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40 dBc @ 1000 MHz
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1.5
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SMA(F)
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QLL1000M7ECS
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LE, LPF
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1000
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DC to 1000
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7
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40 dBc @ 2000 MHz
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1.5
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SMA(F)
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QLL2000M7ECS
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LE, LPF
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2000
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DC to 2000
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7
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40 dBc @ 4000 MHz
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1.5
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SMA(F)
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QLL4000M7ECS
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LE, LPF
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4000
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DC to 4000
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7
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40 dBc @ 8000 MHz
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1.5
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SMA(F)
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QLL8000M7ECS
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LE, LPF
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8000
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DC to 8000
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7
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40 dBc @ 16000 MHz
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1.5
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SMA(F)
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481 Cypress Lane, El Cajon, California 92020-1605
Phone: 619-258-7322 • Fax: 619-444-7939 • Email: Sales@QMicrowave.com