Rectangular Microstrip Patch Calculator
Calculate the dimensions and design parameters of a rectangular microstrip patch antenna using the transmission-line model.
3
Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
W = c/(2f√((εr+1)/2))
εeff = (εr+1)/2 + ((εr-1)/2)(1+12h/W)^(-1/2)
ΔL = 0.412h((εeff+0.3)(W/h+0.264))/((εeff-0.258)(W/h+0.8))
Leff = c/(2f√εeff)
L = Leff - 2ΔL
λg = λ/√εeff
Quarter-wave Feed = λg/4
Ground Width = W + 6h
Ground Length = L + 6h
This formula is used to calculate antenna parameters for rectangular microstrip patch calculator.
Overview
Rectangular Microstrip Patch helps you calculate design values for a microstrip & printed antennas project from Frequency, Dielectric Constant (εr), Substrate Thickness. Calculate the dimensions and design parameters of a rectangular microstrip patch antenna using the transmission-line model. Use the result to make an informed first design decision before choosing hardware, setting dimensions, or evaluating the RF system in its final environment.
Input Guide
Enter Frequency, Dielectric Constant (εr), Substrate Thickness exactly in the units shown by this rectangular microstrip patch. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Frequency — use GHz.
- Dielectric Constant (εr).
- Substrate Thickness — use mm.
Output Guide
The results describe the calculated rectangular microstrip patch values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The Rectangular Microstrip Patch uses W = c/(2f√((εr+1)/2)) εeff = (εr+1)/2 + ((εr-1)/2)(1+12h/W)^(-1/2) ΔL = 0.412h((εeff+0.3)(W/h+0.264))/((εeff-0.258)(W/h+0.8)) Leff = c/(2f√εeff) L = Leff - 2ΔL λg = λ/√εeff Quarter-wave Feed = λg/4 Ground Width = W + 6h Ground Length = L + 6h . Supply Frequency (GHz), Dielectric Constant (εr), Substrate Thickness (mm) in the displayed units, then use the calculated values as the first engineering target for this microstrip & printed antennas design or analysis.
Design Notes
This microstrip & printed antennas calculation is based on W = c/(2f√((εr+1)/2)) εeff = (εr+1)/2 + ((εr-1)/2)(1+12h/W)^(-1/2) ΔL = 0.412h((εeff+0.3)(W/h+0.264))/((εeff-0.258)(W/h+0.8)) Leff = c/(2f√εeff) L = Leff - 2ΔL λg = λ/√εeff Quarter-wave Feed = λg/4 Ground Width = W + 6h Ground Length = L + 6h . Real-world accuracy depends on factors such as material properties, losses, mounting, nearby conductors, ground interaction, feed-line effects, and construction tolerance. Confirm the final system with measurement or simulation.
Build and Tuning Notes
Apply the rectangular microstrip patch result as an initial target, then validate it in the intended installation. Keep the physical layout and feed arrangement consistent while testing, change one parameter at a time, and record the measured outcome before making another adjustment.
Frequently Asked Questions
What does the Rectangular Microstrip Patch calculate?
Calculate the dimensions and design parameters of a rectangular microstrip patch antenna using the transmission-line model. The calculation provides an initial design value based on Frequency (GHz), Dielectric Constant (εr), Substrate Thickness (mm).
Which inputs are needed for the Rectangular Microstrip Patch?
Enter Frequency (GHz), Dielectric Constant (εr), Substrate Thickness (mm) using the displayed units. Each value directly affects the calculated result, so confirm the unit and operating conditions before running the calculation.
How accurate is this rectangular microstrip patch?
It follows W = c/(2f√((εr+1)/2)) εeff = (εr+1)/2 + ((εr-1)/2)(1+12h/W)^(-1/2) ΔL = 0.412h((εeff+0.3)(W/h+0.264))/((εeff-0.258)(W/h+0.8)) Leff = c/(2f√εeff) L = Leff - 2ΔL λg = λ/√εeff Quarter-wave Feed = λg/4 Ground Width = W + 6h Ground Length = L + 6h . It is accurate for the formula assumptions, but installed performance can change because of materials, loss, environment, mounting, nearby objects, and measurement uncertainty.
What should I do after using the Rectangular Microstrip Patch?
Compare the result with the practical constraints of your microstrip & printed antennas system, then validate the completed design with appropriate measurement equipment or simulation.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.