Kratos Microwave Electronics Division (KMED)

Series D197 Voltage Controlled Phase Invariant Attenuators

Application Notes for Microwave Attenuators

The Series D197 voltage controlled PIN diode attenuators offer essentially phase free operation over a wide dynamic range in multi-octave frequency bands between 2 and 18 GHz. The attenuators utilize a unique double balanced arrangement of diodes and quadrature couplers to achieve the phase independent attenuation characteristic. Excellent temperature stability is maintained by employing a self-compensating biasing scheme. (See Fig. 1.)

TYPICAL PERFORMANCE

  

PERFORMANCE CHARACTERISTICS

MODEL	D1972	D1974	D1978
Frequency Range (GHz)	2-6	4-11	6-18
Mean Attenuation Range	32 dB
Insertion Loss (Max)	4 dB	5 dB	7 dB
VSWR (Max)	2.0		3.0
Accuracy of Attenuation	± 0.5 dB
Amplitude Flatness                 0 to 20 dB                                             >20 to 32 dB	± 0.4 dB	± 0.4 dB	± 0.8 dB(1)
	± 0.6 dB	± 0.8 dB	± 1.3 dB(1)
Monotonicity	Guaranteed
Phase Shift                              0 to 20 dB                                             >20 to 32 dB	± 4°	± 4°	± 5°
	± 8°	± 8°	± 10°
Control Voltage	0-3.2 V
Control Input Impedance	10 kohms
Transfer Function	10 dB/V
On Time, Off Time	250 nsec
Temperature Coefficient          0 to 20 dB                                             >20 to32 dB	0.01 dB/°C
	0.03 dB/°C
Max. RF Power Input (Operating)	100 mW
Max. RF Power Input (Survival)	0.5 W
Harmonic Distortion @ Pin = +10 dBm	-40 dBc	-50 dBc	-50 dBc
Power Supply Requirements	+15V ±5% @ 200 mA
	-15V ±5% @ 120 mA

SPECIFICATIONS With EXTENDED RANGE OPTION (OPTION 45)

Mean Attenuation Range	45 dB
Accuracy of Attenuation                         0 to 20 dB                                                           >20 to 32 dB                                                                    >32 dB	± 1.0 dB
	± 2.0 dB
	± 3.5 dB
Amplitude Flatness                                0 to 20 dB                                                            >20 to32 dB                                                                    >32 dB	± 0.4 dB	± 0.4 dB	± 0.8 dB(1)
	± 0.6 dB	± 0.8 dB	± 1.3 dB(1)
	± 1.5 dB	± 1.5 dB	± 2.0 dB
Phase Variation                                     0 to 20 dB                                                           >20 to 32 dB                                                                    >32 dB	± 4°	± 4°	± 5°
	± 8°	± 8°	± 10°
	± 15°	± 20°	± 30°

(1) Except from 8-18 GHz, flatness is ± 0.5 dB up to 20 dB, ± 1.0 dB up to 32 dB.

ENVIRONMENTAL RATINGS Operating Temperature Range .......... -54°C to +110°C Non-Operating Temperature Range ... -65°C to +125°C 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 (0.06" 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 7 Two SMA male RF connectors 10 One SMA male (J1) and one SMA female (J2) RF connectors 45 Extended attenuation range to 45 dB 65 ± 12V operation G09 Guaranteed to meet Environmental Ratings G12 RoHS Compliant G18 REACH Compliant

 

 DIMENSIONS AND WEIGHT

Weight: 5 oz. (142 gr) approx.

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

MODEL	A	B	C	D	E	F	G	H
D1972	2.5 (63,5)	2.26 (57,4)	2.28 (57,9)	0.22 (5,6)	0.91 (23.1)	1.25 (31,7)	1.5 (38,1)	1.7 (43,2)
D1974	2.0 (50,8)	1.76 (44,7)	2.43 (61,7)	0.18 (4,6)	0.66 (16,8)	1.0 (25,4)	1.25 (31,7)	1.45 (36,8)
D1978	2.0 (50,8)	1.76 (44,7)	2.58 (65,5)	0.18 (4,6)	0.66 (16,8)	1.0 (25,4)	1.25 (31,7)	1.50 (38,1)

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