DC Blocks

RF Test Accessories Catalog
D.C. Block

2.9 mm DC Blocks
Features
• 100 MHz to 26.5 GHz and 40 GHz Operation
• 0.5 dB Insertion Loss
• 200 Volts Blocking
• Outer Only Type Available
• 50 GHz, 2.4 mm Models Also Available,
Please Call
(Inner, Inner-Outer)
100 MHz to 40 GHz Application
The MIDISCO Product Line continues to grow, consistent with
Industry needs for higher and higher frequency coaxial components. These
DC blocks are capacitive coupled and essentially transparent to RF signals
up to 40 GHz, while providing rejection to DC and audio frequencies. They
provide a minimum of 55 dB of rejection at 65 KHz. Applications include
ground loop elimination, test setup isolation, and other applications where
undesired DC or audio signals are present.
MODEL FREQ. (GHz) TYPE VSWR CONN. A B
MDC1181-26 26.5 INNER 1.35:1 MALE-FEMALE .855 Ø .280
MDC1181-26F 26.5 INNER 1.35:1 FEMALE-FEMALE .920 Ø .280
MDC1181-26M 26.5 INNER 1.35:1 MALE-MALE .965 Ø .360
MDC1181-40 40.0 INNER 1.45:1 MALE-FEMALE .855 Ø .280
MDC1181-40F 40.0 INNER 1.45:1 FEMALE-FEMALE .920 Ø .280
MDC1181-40M 40.0 INNER 1.45:1 MALE-MALE .965 Ø .360
MDC1182-26 26.5 INNER-OUTER 1.35:1 MALE-FEMALE .860 Ø .500
MDC1182-26F 26.5 INNER-OUTER 1.35:1 FEMALE-FEMALE .925 Ø .500
MDC1182-26M 26.5 INNER-OUTER 1.35:1 MALE-MALE .970 Ø .500
MDC1182-40 40.0 INNER-OUTER 1.45:1 MALE-FEMALE .860 Ø .500
MDC1182-40F 40.0 INNER-OUTER 1.45:1 FEMALE-FEMALE .925 Ø .500
MDC1182-40M 40.0 INNER-OUTER 1.45:1 MALE-MALE .970 Ø .500 2.9 mm DC BLOCK

D.C. Blocks
Features
• 0.1 to 18 GHz
• Stainless steel or brass construction
• Maximum loss @ 18 GHz: 0.5 dB
• Impedance: 50 Ohms
• Insertion loss @ 1 KHz: 58 dB
• 52 dB for MDC1181N, MDC1182-T18
• Temperature (operating): -55 0 C to
+125 0 C (except F series = +80 0 C max.)
• Most models in stock
• See p. 24 for 26.5 GHz, 40 GHz & 50 GHz
models
0.1 to 18 GHz – Type N, SMA, TNC, BNC, 7 mm, F, 2.4 mm, 2.9 mm
MIDISCO MDC1181 inside blocks are capacitively coupled through the center
conductor to prevent DC current flow. The MDC1182 In/Out adds series capacitance to the outer
conductor as well to suppress the flow of ground and audio interference signals. RF power flows
uninterrupted.
VSWR @ F (GHz) Connectors Dim.(Ref.)
Part Number Type 0.1-8 8-12.4 12.4-18 1 2 A B
MDC1181S Inside 1.2 1.25 1.35 SMA (M) SMA (F) 0.86 0.28
MDC1182A-S12 In/Out 1.2 1.25 N/A SMA (M) SMA (F) 1.07 0.50
MDC1182A-S18 In/Out 1.2 1.25 1.35 SMA (M) SMA (F) 1.10 0.50
MDC1181N Inside 1.2 1.25 1.35 N (M) N (F) 1.77 0.63
MDC1182A-N12 In/Out 1.2 1.25 N/A N (M) N (F) 1.91 0.50
MDC1182A-N18 In/Out 1.2 1.25 1.35 N (M) N (F) 1.91 0.50
MDC1181T Inside 1.2 1.25 1.35 TNC (M) TNC (F) 2.07 0.56
MDC1182-T18 In/Out 1.2 1.25 1.35 TNC (M) TNC (F) 2.07 0.50
MDC1181B Inside 1.35* N/A N/A BNC (M) BNC (F) 1.60 0.50
MDC1182B In/Out 1.35* N/A N/A BNC (M) BNC (F) 1.60 0.50
MDC1181-718 Inside 1.2 1.25 1.35 7 mm 7 mm 2.13 0.50
MDC1182-718 In/Out 1.2 1.25 1.35 7 mm 7 mm 2.13 0.50
MDC1181F Inside 1.35** N/A N/A F (M) F (F) 1.51 0.44
MDC1182F In/Out 1.35** N/A N/A F (M) F (F) 1.51 0.44
*: to 4 GHz **: to 2 GHz
Note: Most DC blocks are also available with double-male or double-female connectors. MIDISCO also
supplies 2.9mm 26.5 GHz and 40 GHz units; 2.4mm 50GHz units; and 75 Ω BNC and Type N.
Type N to SMA 18 GHz DC blocks are also available in all configurations. Consult factory for more
information.