Kratos Microwave Electronics Division (KMED)

Microwave Attenuator Series D195

Application Notes for Microwave Attenuators

MODEL	FREQUENCY RANGE (GHz)	MAX. INSERTION LOSS (dB)	MAX. VSWR	MAX. FLATNESS (±dB) AT MEAN ATTENUATION LEVELS UP TO
				10 dB	20 dB	40 dB	60 dB	80 dB
D1950A*	0.5 - 1.0	1.5	2.0	0.3	0.8	1.7	3.0	3.6
D1951	1.0 - 2.0	1.7	1.5	0.3	0.8	1.5	1.6
	0.75 - 2.25(1)	1.8	2.0	0.5	1.4	3.0	3.5
D1952	2.0 - 4.0	2.0	1.5	0.3	0.8	1.5	1.6
	1.5 - 4.5(1)	2.1	2.0	0.5	1.4	3.0	3.5
D1953	2.6 - 5.2	2.2	1.6	0.3	0.8	1.5	1.8
	1.95 - 5.85(1)	2.3	2.1	0.5	1.4	3.0	3.5
D1954	4.0 - 8.0	2.6	1.7	0.3	0.8	1.5	1.6
	3.0 - 9.0(1)	2.7	2.2	0.5	1.4	3.0	3.5
D1955	5.0 - 10.0	2.8	1.7	0.5	0.9	1.5	1.6
	3.75 - 11.25(1)	2.9	2.2	0.7	1.4	3.0	3.5
D1956	6.0 - 12.0	2.9	1.8	0.7	1.0	1.5	1.6
	4.5 - 13.5(1)	3.0	2.2	0.9	1.5	3.0	3.5
D1958	8.0 - 18.0	3.0(2)	1.8(2)	0.7	1.0	1.5	1.6
	6.0 - 18.0(1)	3.0(2)	1.8(2)	0.9	1.5	3.0	3.5

*Model D1950A is a special-order product. Consult factory before ordering.

(1) Specifications for the extended frequency ranges are typical.

(2) Except from 16 - 18 GHz where insertion loss is 4.0 dB max and VSWR is 2.0 max.

 

PERFORMANCE CHARACTERISTICS

Mean Attenuation Range    D1950A* ........................... 80 dB    All other units ................... 60 dB Accuracy of Attenuation    0 to 30dB ......................... ±0.5 dB    > 30 to 50 dB .................... ±1.0 dB    > 50 to 60 dB .................... ±1.5 dB    > 60 to 80 dB .................... ±2.0 dB (D1950A* only) Monotonicity ....................... Guaranteed Phase Shift .......................... See Application Note Temperature Coefficient ....... ±0.025 dB/ C Power Handling Capability Without Performance Degradation       D1950A*, D1951 ............. 10 mW cw or peak       All other units ................ 100 mW cw or peak Survival Power (from -65%C to +25%C; see Fig. 2 for higher temperatures)       All units........................... 1 W average 25W peak (1 µsec max pulse width)

Switching Characteristics    Off Time       D1950A* .................................... 600 nsec max       All other units ............................ 100 nsec max    On Time       D1950A* ..................................... 10 µsec max       All other units ............................. 1.6 µsec max    Fall Time       D1950A* ..................................... 500 nsec max       All other units ............................. 30 nsec max    Rise Time       D1950A* ..................................... 10 µsec max       All other units ............................. 1.5 µsec max Nominal Control Voltage Characteristics Range        Operating Maximum D1950A*   0 to + 8V   ± 15V All Other Units   0 to + 6V  ± 15V Transfer Function .............................. 10 dB / volt Input Impedance ............................... 10 Kohms Modulation Bandwidth    Small Signal       D1950A* ..................................... 25 kHz       All other units ............................. 500 kHz    Large Signal       D1950A* ..................................... 5 kHz       All other units ............................. 50 kHz Power Supply Requirements .............. +12V  ±5%, 100 mA -12V  ±5%, 50 mA Power Supply Rejection ..................... Less than 0.1 dB / volt change in either supply

*Model D1950A is a special-order product. Consult factory before ordering.

OPTION (G09) ENVIRONMENTAL RATINGS Operating Temperature  Range ................ -54oC to +110oC Non-Operating Temperature Range ......... -65oC to +125oC Humidity ................................................. MIL-STD-202F, Method 103B, Cond. B (96 hrs. at 95%) Shock ...................................................... MIL-STD-202F, Method 213B, Cond. B (75G, 6 msec) Vibration ................................................. MIL-STD-202F, Method 204D, Cond. B (.06" double amplitude or 15G, whichever is less) Altitude ................................................... MIL-STD-202F, Method 105C, Cond. B (50,000 ft.) Temp. Cycling .......................................... MIL-STD-202F, Method 107D, Cond. A, 5 cycles

AVAILABLE OPTIONS Option No. Description 3 SMA female control connector 7 Two SMA male RFconnectors 10 One SMA male (J1) and one SMA female (J2) RF connectors 58 Internally-generated reset to insertion loss (not available on D1950A)(1) 59 Externally-triggered reset to insertion loss (not available on D1950A*)(2)(3) 61 20 dB / volt transfer function with 0 to +3V control signal input (+4V for the D1950A*) 62 ± 15 volt operation 64 SMC male control connector 64A SMB male control connector  G09 Guaranteed to meet Environmental Ratings G12 RoHS Compliant G18 REACH Compliant

(1) Where use of an Option 59 external reset pulse (see note 2 below) is not feasible, this option is available which will
      automatically sense the slope and magnitude of the control signal and reset the unit to the insertion loss state within
      200 nsec for a stop of 50 dB or more.
(2) An external terminal is provided for the user to apply a fast (10 nsec, max rise time) positive-going 3-volt pulse at
      least 0.5 µsec wide to accelerate the return of the attenuator to the insertion loss state with the simultaneous
      lowering of the control signal to the zero voltage level. This reset can be accomplished within 200 nsec.
(3) The input impedance of units equipped with Option 59 is a circuit equivalent to approximately 50 pF in series with a
      parallel combination of 100 pF and 1000 ohms.

DIMENSIONS AND WEIGHTS 

 

 

Dimensions are stated in inches (mm).  Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.008

The information contained in this data sheet is basic marketing information and does not contain any export controlled information.