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Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator

Easily calculate and compute half-wave (λ/2) dipole antenna radiation resistance, directivity & impedance calculator with accurate equations, live formulas, and expert guidance.

Design frequency (e.g. 146 MHz for 2m VHF ham band).

Thickness of conductor element.

Ohmic copper/aluminum skin effect loss.

Calculated Result
0.96 m

Resonant Dipole Length

Resonant Dipole Length

0.96 m

Resonant Dipole Length Meters

0.965

Free Space Half Wavelength Meters

1.027

Radiation Resistance Ohms

73.13

Antenna Efficiency Percent

98.9

0.96 — m

Calculation Breakdown

  1. Applied FormulaCalculates the radiation resistance, end-effect velocity factor foreshortening, physical cut length, and radiation efficiency for resonant half-wave center-fed dipole antennas.R_{rad} = 73.13\,\Omega, \quad \eta = \frac{R_{rad}}{R_{rad} + R_{loss}}, \quad L_{res} = k_v \frac{c}{2 f}

Half-Wave Dipole Impedance Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.0Resonant Dipole Length

What Is the Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator?

This tool computes half-wave (λ/2) dipole antenna radiation resistance, directivity & impedance calculator with high precision arithmetic.

How Does the Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator Work?

Calculates the radiation resistance, end-effect velocity factor foreshortening, physical cut length, and radiation efficiency for resonant half-wave center-fed dipole antennas.

Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

Rrad=73.13 Ω,η=RradRrad+Rloss,Lres=kvc2fR_{rad} = 73.13\,\Omega, \quad \eta = \frac{R_{rad}}{R_{rad} + R_{loss}}, \quad L_{res} = k_v \frac{c}{2 f}

Calculates the radiation resistance, end-effect velocity factor foreshortening, physical cut length, and radiation efficiency for resonant half-wave center-fed dipole antennas.

How to Use the Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Half-Wave (λ/2) Dipole Antenna Radiation Resistance, Directivity & Impedance Calculator Example

Input Values:

operatingFrequencyMhz:146
conductorDiameterMm:3
lossResistanceOhms:0.8
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required m.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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