# neper

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## English[edit]

### Etymology[edit]

From Joannes Neper, the Latinized name of John Napier, a Scottish mathematician.

### Pronunciation[edit]

- Rhymes: -eɪpə(r)

### Noun[edit]

**neper** (*plural* **nepers**)

- (electronics) A non-SI unit of the attenuation (or sometimes gain) of field and power quantities such as electronic signals; the natural logarithm of a ratio, with 1 Np (a ratio of 2.718:1) being equivalent to 8.686 dB.
**1994**, T. G. Leighton,*The Acoustic Bubble*, page 28,- Values of
*b*, the amplitude attenuation constant, are given for various materials in Table 1.1. Having dimensions of [length]^{-1}, it is usually measured in**nepers**per centimetre (Np cm^{-1}).

- Values of
**2006**, R. K. Shevgaonkar,*Electromagnetic Waves*, page 15,- The unit of α is
**nepers**per meter. It can be easily seen that if a line has an attenuation constant of 1**neper**/m, a unit amplitude voltage wave will reduce to*e*^{-1}over a distance of 1 meter.

- The unit of α is
**2008**, Alan J. Fenn,*Adaptive Phased Array Thermotherapy for Cancer*, page 105,- The attenuation constant for the phantom muscle tissue is α
_{m}= 10.0**nepers**/m.

- The attenuation constant for the phantom muscle tissue is α

#### Related terms[edit]

### Anagrams[edit]

## Norwegian Bokmål[edit]

### Noun[edit]

**neper** m or f

- indefinite plural of
*nepe*

## Norwegian Nynorsk[edit]

### Noun[edit]

**neper** f

- indefinite plural of
*nepe*