Search RFCafe.com                           
      More Than 18,000 Unique Pages
Please support me by ADVERTISING!
Serving a Pleasant Blend of Yesterday, Today, and Tomorrow™ Please Support My Advertisers!
   Formulas & Data
Electronics | RF
Mathematics
Mechanics | Physics
     AI-Generated
     Technical Data
Pioneers | Society
Companies | Parts
Principles | Assns


 About | Sitemap
Homepage Archive
        Resources
Articles, Forums Calculators, Radar
Magazines, Museum
Radio Service Data
Software, Videos
     Entertainment
Crosswords, Humor Cogitations, Podcast
Quotes, Quizzes
   Parts & Services
1000s of Listings
 Vintage Magazines
Electronics World
Popular Electronics
Radio & TV News
QST | Pop Science
Popular Mechanics
Radio-Craft
Radio-Electronics
Short Wave Craft
Electronics | OFA
Saturday Eve Post

Software: RF Cascade Workbook
RF Stencils for Visio | RF Symbols for Visio
RF Symbols for Office | Cafe Press
Espresso Engineering Workbook

Aegis Power  |  Alliance Test
Centric RF  |  Empower RF
ISOTEC  |  Reactel  |  RFCT
San Fran Circuits



Crane Aerospace Electronics Microwave Solutions

Innovative Power Products Cool Chip Thermal Dissipation - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Effective Isotropic Radiated Power (EIRP)

Effective isotropic radiated power (sometimes also referred to as equivalent isotropic radiated power), is a commonly used unit when specifying antenna efficiency (gain).

Isotropic Radiator - RF Cafe

In order to provide a common reference for radiated power, an ideal isotropic radiator is used as the standard. An isotropic radiator emits power from a singular point (dimensionless) whose wavefront is a perfect sphere of constant voltage (or power for equal impedances). Any gain specified for an antenna represents a concentration of the radiation pattern in a given direction. EIRP is calculated as follows:

RF Cafe: EIRP equation

where  Power (dBm or dBW), Loss (dB), Gain (dBi)

Most antenna types; e.g., parabolic, Yagi, log periodic, have gains based on many physical parameters. A few common antenna types are fixed in physical dimensions and have well-known gains when positioned optimally above a ground plane; e.g.,1/4-wave monopole and 1/2-wave dipole antennas have gains of 2.15 dBi.

Sometimes, especially in the amateur radio world, antenna gains are expressed in units of dBd, which is decibels relative to a ½-wave dipole antenna. This is because the ½-wave dipole is thought of as a standard when discussing transmitter and receiver performance.

PCB Directory (Manufacturers)

withwave microwave devices - RF Cafe

Rigol DHO1000 Oscilloscope - RF Cafe