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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

PARAMETER

STANDARD FILTER SPECIFICATIONS

FIELD DESCRIPTION

CUSTOM PERFORMANCE

   

Cutoff Frequency (Fco)

1500 to 8000 MHz

Field 1 (In MHz)

3dB Bandwidth (BW3dB)

DC to Fco

Standard

Rejection

Characterized by Chebychev transfer function with 3 to 15 elements. See plots.

Field 3 (In Number of Elements)

STANDARD PERFORMANCE

   

Insertion Loss (I/L)

Determined by Fc, BW3dB, and number of elements. See plots.

None

Return Loss

10 dB typical over 70% of BW3dB. See plots..

Standard

Characteristic Impedance

50 Ohms

Standard

Input Power

20 dBm maximum

Standard

ENVIRONMENTAL CAPABILITIES

   

Operating Temperature

0oC to +50oC

Standard

Storage Temperature

-65oC to +125oC

Standard

Thermal Cycles

25 cycles  -65oC / +125oC

Standard

Humidity

90%-95% relative humidity, non-condensing environment

Standard

MECHANICAL CONFIGURATION

   

Option 1

Connectorized

  • Finish - Silver or Brass
  • I/O - SMA-Female connectors
  • 1.5" x 0.5" x 0.5" typ

Field 4 (Select "CS")

Option 2

Pins - Formed  (Surface Mountable)

  • Finish - Silver or brass
  • I/O - Formed Leads
  • 1.5" x 0.5" x 0.5" typ

Field 4 (Select "FS")

Option 3

Pins - Straight

  • Finish - Silver or brass
  • I/O - Formed Leads
  • 1.5" x 0.5" x 0.5" typ

Field 4 (Select "FA")

Option 4

Microstrip

  • Finish - Silver
  • I/O - Silver ribbon
  • 0.5" x 0.3" x 0.3" typ

Field 4 (Select "MS")

Option 5

Surface Mount Technology (SMT)

  • Finish - Polyamide substrate with tin or solder finish.
  • I/O - SMT
  • 0.5" x 0.5" x 0.33" typ

Field 4 (Select "SM")

SPECIAL OPTIONS

A variety of special options are available.  Unlimited special options may be included in Field 5. Consult Q Microwave´s Sales Office for details.

Field 5

Select QLL-Series Filters

Part Number/ Description

Filter Type

Fco (MHz)

BW3dB (MHz)

Elmt

Rejection

I/L (dB)

I/O Style

QLL500M7ECS

LE, LPF

500

DC to 500

7

40 dBc @ 1000 MHz

1.5

SMA(F)

QLL1000M7ECS

LE, LPF

1000

DC to 1000

7

40 dBc @ 2000 MHz

1.5

SMA(F)

QLL2000M7ECS

LE, LPF

2000

DC to 2000

7

40 dBc @ 4000 MHz

1.5

SMA(F)

QLL4000M7ECS

LE, LPF

4000

DC to 4000

7

40 dBc @ 8000 MHz

1.5

SMA(F)

QLL8000M7ECS

LE, LPF

8000

DC to 8000

7

40 dBc @ 16000 MHz

1.5

SMA(F)

 

 

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