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The main-line loss of a coupler is defined as the loss between the input and output ports. Theoretical loss is defined as that of a perfect (lossless) coupler, for which the input power is the sum of the (main line) output power and the power at the coupled port. Therefore, the theoretical main-line loss is dependent upon the fraction of the input power that is an output at the coupled port. The conversion between them can be expressed mathematically. This application note derives the formula and provides a conversion table.

A lossless coupler transfers all input power to the output and coupled ports: Pin = Pout + Pcoupled (1).

In practice, positive decibel values are given for main-line loss and coupling (the fraction of the input power that is outputted at the coupled port):

ML (main-line loss in dB) = 10 log10(Pin / Pout) (2) and

CPL (coupling in dB) = 10 log10 (Pin /Pcoupled) (3)

With these three equations, the CPL to ML conversion can be obtained.

From equation (1), Pout/Pin = 1 – Pcoupled/Pin (4)

From equation (3), Pcoupled /Pin = 10^–CPL/10 (5)

Substitute (4), and then (5), into (2):

ML = 10 log10 (Pin / Pout) = 10 log10 [1/(1 – Pcoupled/Pin)] 

= 10 log10 [1/(1 – 10 ^–CPL/10 )] (6)

Part NumberStatusFrequency MinFrequency MaxCouplingDirectivity
PDC-0R318G-20C-NFF-50W
Preliminary
Preliminary0.3 GHz18 GHz20 ± 1.0dB10dB
PDC-300M500M-10C-NFF-40W
Preliminary
Preliminary300 MHz500 MHz10 ± 1.0dB20 dB
PDC-300M500M-20C-NFF-40W
Preliminary
Preliminary300 MHz500 MHz20 ± 1.0dB20 dB
PDC-460M950M-10C-NFF-200WPreliminary460 MHz950 MHz10=±1 dB20 dB MIN
PDC-1G40G-10C-292FF-20WPreliminary1.0 GHz40.0 GHz10 ± 1.0dB10 dB Min
PDC-0R1G18G-10C-SFF-50W
Preliminary
Preliminary0.1 GHz18.0 GHz10 dB Typ20 dB Typ
PDC-8G40G-10-292FF
Preliminary
Preliminary8.0 GHz40.0 GHz10dB +/- 1.0dB Max12 dB Min
PDC-26G500M40G-20-292FF
Prelimiary
Prelimiary26.5 GHz40.0 GHz20 dB +/- 1.0 dB Max10 dB Min
PDC-26G500M40G-30-292FF
Preliminary
Preliminary26.5 GHz40.0 GHz30 dB +/- 1.0 dB Max10 dB Min
PDC-26G500M40G-10-292FF
Preliminary
Preliminary26.5 GHz40.0 GHz10 dB +/- 0.8 dB Max12 dB Min
PDC-31G50G-15-10W-24FF
Prelimianry
Prelimianry31.0 GHz50.0 GHz15 dB ±1.0dB15 dB Min
PDC-15G32G-20-20W-292FF
Preliminary
Preliminary15.0 GHz32.0 GHz20 dB ±1.0dB Max15 dB Min
PDC-1G40G-30-292FF-20W
Preliminary
Preliminary1.0 GHz40.0 GHz30±1.0 dB Max6 dB Min
PDC-31G50G-20-20W-24FF
Preliminary
Preliminary31.0 GHz50.0 GHz20 dB ±1.0dB15 dB Min
PDC-1G500M4G-15-50W-SFF
Preliminary
Preliminary1.5 GHz4.0 GHz±0.7 dB Max15 dB Min
PDC-7G16G-15-50W-SFF
Preliminary
Preliminary7.0 GHz16.0 GHz15 dB ±1.0 dB15 dB Min
PDC-100M2G-15-SFF-50W
Preliminary
Preliminary0.1 GHz2.0 GHz15 ± 1.0 dB18 dB Min
PDC-1G16G-20-50W-SFF
Prelimianry
Prelimianry1.0 GHz16.0 GHz20 dB ±1.0 dB15 dB Min
PDC-3G8G-15-50W-SFF
Preliminary
Preliminary3.0 GHz8.0 GHz15 dB ±1.0 dB Max15 dB Min
PDC-100M2G-20-SFF-50W
Preliminary
Preliminary0.1 GHz2.0 GHz< or = 20 ± 1.0 dB18 dB Min
PDC-15G32G-15-20W-292FF
Preliminary
Preliminary15.0 GHz32.0 GHz15 dB ±1.0dB15 dB Min
PDC-17-100M50G-24FF
Preliminary
Preliminary0.1 GHz50.0 GHz-31 to-16dB @ 0.1 to 1.5GHz Max
17 +/- 2.2 dB @ 1.5 to 50.0 GHz Max
6 dB Min
PDC-1G50G-10C-NFF
Preliminary
Preliminary1.0 GHz50.0 GHz10 dB ±1.2 dB Max8 dB Min
PDC-800M1G600M-10-30W-SMA
Preliminary
Preliminary0.8 GHz1.6 GHz10 dB ±0.25dB Max25 dB Min
PDC-7984-30-50W-SMA
Preliminary
Preliminary7.9 GHz8.4 GHz30 dB ± 0.5 dB Max18 dB Min
PDC-0545-6-SFF-30W
Preliminary
Preliminary0.5 GHz4.5 GHz6 ± 0.5 dB MAX18 dB MIN
PDC-192212-6-20W-SFF
Active
Active19.2 GHz21.2 GHz6 ± 0.7 dB Max10 dB Min
PDC-3336-6-20W-SFF
Active
Active33 GHz36 GHz6 ± 0.7 dB Max10 dB Min
PDC-20M6G-24-5D5-12V-SFF
Preliminary
Preliminary0.02 GHz6 GHz16 dB typ.
-
PDC-12-20-50W-SMA
Preliminary
Preliminary1 GHz2 GHz= 20 ± 0.7dB>25 dB
PDC-820-20-25W-SFF
Active
Active8 GHz20 GHz20 dB ±1.0dB Max12 dB Min
PDC-418-20-50W-SFF
Active
Active4.0 GHz18.0 GHz20 dB ± 0.7 dB max.12 dB min.
PDDC-10M1-40-SK
Active
Active0.01 GHz1.0 GHz40dB Nominal> 15dB
RFOC-811-QRC-DC-10
Active
Active8 GHz11 GHz10 ± 1.25 dB10 dB Min
PDC-324-10C-292FF-20W
Preliminary
Preliminary3.0 GHz24.0 GHz10 ± 1 dB max.12 dB min.
PDC-416-10C-SFF-50W
Preliminary
Preliminary4.0 GHz16.0 GHz10 ± 0.7 dB max.15 dB min.
PDC-48-6C-SFF-50W
Preliminary
Preliminary4.0 GHz8.0 GHz6 ± 0.7 dB max.22 dB min.
PDC-DC18G-18C-NFF-200W
Active
ActiveDC18.0 GHz30 dB @ 18.0 GHz
50 dB @ 1.0 GHz
15 dB Min, 22 dB Typ (1.0 to 14.0 GHz)
12 dB Min, 16 dB Typ (14.0 to 18.0 GHz)
PDC-18G40G-10C-SFF-20W
Preliminary
Preliminary18.0 GHz40.0 GHz10 ± 1 dB typ.10 dB min.
PDC-2G18G-10C-SFF-50W
Preliminary
Preliminary2.0 GHz18.0 GHz10 ± 0.7 dB max.15 dB min.
PDC-0R5G2G-10C-SFF-50W
Preliminary
Preliminary0.5 GHz2.0 GHz10 ± 0.4 dB22 dB min.
PDC-2G18G-20C-SFF-50W
Active
Active2.0 GHz18.0 GHz20 ± 0.7 dB Max15 dB Min
PDC-1G4G-30C-NFF
Preliminary
Preliminary1 GHz4 GHz30 dB17 dB min.
PDC-25M-35M-25-SFF
Preliminary
Preliminary0.025 GHz0.035 GHz25 dB ±2dB25 dB min
PDC-26D5G40G-10C-292FF
Preliminary
Preliminary26.5 GHz40 GHz10±1.0 dB12 dB min.
PDC-2G8G-30C-NFF-200W
Preliminary
Preliminary2 GHz8 GHz30 dB ± 1dB18 dB min
PDC-400M500M-20C-SFF-30W
Preliminary
Preliminary0.4 GHz0.5 GHz20 ±1.0 dB20 dB min.
PDC-800M3G-30C-NFF-300W
Preliminary
Preliminary0.8 GHz3 GHz30 dB ± 1dB22 dB min
PDC-2G8G-10C-SFF-50W
Preliminary
Preliminary2 GHz8 GHz10 dB max. ±0.5 dB20 dB min.
PDC-2G6G-35C-NFF-200W
Active
Active2 GHz6 GHz35 ±1 dB15 dB Min, 22 dB Typ
PDC-100M500M-40C-NFF-500W
Active
Active0.1 GHz0.5 GHz40 dB ± 1dB20 dB min
PDC-1G40G-292FF-50W
Active
Active1 GHz40 GHz20 dB max.10 dB min.
PDC-800M2D5G-6C-NFF-60W *
Active
Active0.8 GHz2.5 GHz6<=±0.5 dB20 dB min
PDC-800M2D5G-30C-NFF-60W *
Active
Active0.8 GHz2.5 GHz30 ± 1.0 dB20 dB Min
PDC-800M2D5G-20C-SFF-50W *
Active
Active0.8 GHz2.5 GHz20±1.0 dB20 dB min
PDC-800M2D5G-10C-SFF-50W *
Active
Active0.8 GHz2.5 GHz10±1.0 dB20 dB min
PDC-800M2D5G-30C-SFF-50W *
Active
Active0.8 GHz2.5 GHz30 < ±1.0 dB20 dB Min
PDC-800M2D5G-10C-NFF-60W *
Active
Active0.8 GHz2.5 GHz10<=±0.8 dB20 dB min
PDC-800M2D5G-6C-SFF-50W *
Active
Active0.8 GHz2.5 GHz6 ±1.0 dB20 dB Min
PDC-800M2D5G-20C-NFF-60W *
Active
Active0.8 GHz2.5 GHz20 ± 1.0 dB20 dB Min