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Whip Antenna Calculator

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Whip Antenna Calculator | Quarter Wave Tuning Solver
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RESULTS
Capacitance
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Inductance
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Quarter Wavelength
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Antenna Length %
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Radiation Resistance
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Input Parameters Specification

Operating Frequency (Fr) The operational transmission frequency carrier signal injected across the whip structure, scaling in kHz, MHz, or GHz bands.
Physical Rod Length The total linear height of the vertical whip radiating rod segment, input using inches, feet, or base meters.
Element Diameter The exact cross-sectional core thickness profile diameter of the physical rod radiator wire, critical for self-capacitance evaluation.

Practical Operational Examples

Example 1: Short VHF Whip Configuration
• Frequency = 150.00 MHz | Rod Length = 1.25 ft | Wire Diameter = 0.15 in
• Calculated Capacitance: 11.23707204 pF | Base Inductance Needed: 100.10659613 nH
Example 2: GHz Micro-Whip Transceiver
• Frequency = 1.20 GHz (Default Input Unit Scale) | Rod Length = 0.15 ft | Wire Diameter = 0.04 in
• Calculated Quarter Wavelength: 0.06250000 m | Radiation Resistance: 0.06233766 Ω

Short Whip Antenna Circuit and Structural Model

The vector schematic layout maps the absolute physical properties of a base-loaded resonant short vertical whip antenna driven using standard coaxial feed lines.

B A < ¼λ L? 50 Ω coax feed to RX/TX

Formulas & Mathematical Logic

The matrix processes physical electrical properties of a cylindrical wire element configuration operating near resonant frequency thresholds:

Antenna Input Capacitance Calculation (c1):
c1 = (17 * Lft) / [ (log10((24 * Lft) / Dia) - 1) * (1 - (Fr * Lft / 234)² ) ]
Resonant Tuning Base Loading Inductance (c2):
c2 = [ 1 / ((2 * pi * Fr * 10⁶)² * c1 * 10⁻¹²) ] / 10⁻⁹
Free Space Quarter Wavelength Boundary Factor (c3):
c3 = (300 / Fr) / 4
Whip Element Radiation Resistance Coefficient (c5):
c5 = [ ((Lft / 984) * Fr * 360)² ] / 312

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About this tool

Whip Antenna Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.