Friis Antennas Path Loss Calculator Friis Path Loss Calculator Calculate the free-space path loss using the Friis equation: \[ PL_{\text{dB}} = 20 \log_{10}\!\Bigl(\frac{4\pi R\,f}{0.3}\Bigr) \] where \(R\) is in meters and \(f\) is in GHz. * Enter the distance (m) and frequency (GHz). Step 1: Enter Parameters Distance, \(R\) (m): Example: 100 m Frequency, \(f\) […]
Read MoreEffective Antenna Aperture Calculator Effective Antenna Aperture Calculator Calculate the effective aperture using: \[ A_e = \frac{\lambda^2\,G}{4\pi} \] with \(\lambda=\frac{0.3}{f}\) (m) for frequency \(f\) in GHz and \(G=10^{\frac{G_{\rm dB}}{10}}\). * Enter the operating frequency (GHz) and antenna gain (dB). Step 1: Enter Parameters Operating Frequency, \(f\) (GHz): Example: 10 GHz Antenna Gain, (dB): Example: 20 […]
Read MoreDipole Antenna Calculator Dipole Antenna Calculator Calculate the total length of a half‑wave dipole antenna using the 468/f rule: \[ L_{\text{ft}} = \frac{468}{f \,(\text{MHz})} \] and convert it to meters. * Enter the operating frequency (MHz). Step 1: Enter Frequency Frequency \(f\) (MHz): Example: 14 MHz (for the 20m band) Calculate Dipole Length Dipole Antenna […]
Read MoreAperture Antennas Electric Field Calculator Aperture Antenna Electric Field Calculator Calculate the electric field at the aperture using: \[ E = \sqrt{\frac{2\,\eta_0\,P}{A}} \] where \(\eta_0\approx377\,\Omega\), \(P\) is the radiated power (W), and \(A\) is the aperture area (m²). * Enter the radiated power and the aperture area. Step 1: Enter Parameters Radiated Power, \(P\) (W): […]
Read MoreAntenna Gain Calculator Calculate the antenna gain using: \[ G = \eta \left(\frac{\pi D}{\lambda}\right)^2,\quad \lambda=\frac{0.3}{f} \] where \(f\) is in GHz. * Enter the efficiency (0 to 1), antenna aperture \(D\) (m), and operating frequency \(f\) (GHz). Step 1: Enter Parameters Efficiency, \( \eta \): Example: 0.6 (i.e. 60%) Antenna Aperture, \( D \) (m): […]
Read MoreAntenna Array Calculator This calculator computes the main beam direction and an approximate half‑power beamwidth (HPBW) for a uniform linear array. For a linear array with \(N\) elements, element spacing \(d\) (in wavelengths), and a progressive phase shift \(\beta\) (in degrees), the main beam is steered according to \[ k\,d\cos\theta_0+\beta_{\rm rad}=0 \quad\Longrightarrow\quad \cos\theta_0=-\frac{\beta_{\rm rad}}{2\pi\,d}. \] […]
Read MoreAir‑Filled Rectangular Cavity Resonator Calculator Rectangular Cavity Resonator Calculator Calculate the resonant frequency of an air‑filled rectangular cavity resonator using: \[ f_{mnp} = \frac{c}{2}\sqrt{\left(\frac{m}{a}\right)^2+\left(\frac{n}{b}\right)^2+\left(\frac{p}{d}\right)^2} \] where \(c=3\times10^8\) m/s, and \(a\), \(b\), \(d\) are the cavity dimensions. * Enter the cavity dimensions in meters and the mode indices (m, n, p). For example, TE101 corresponds to […]
Read MoreAir-Filled Circular Cavity Resonator Calculator For the TE₁₁₁ mode, the resonant frequency is given by: \[ f_{111} = \frac{c}{2\pi}\sqrt{\left(\frac{x’_{11}}{a}\right)^2+\left(\frac{\pi}{d}\right)^2} \] where \(x’_{11}\approx1.8412\), \(a\) is the cavity radius, and \(d\) is the cavity height. * Enter the cavity radius (m) and height (m). Step 1: Enter Cavity Dimensions Cavity Radius, \( a \) (m): Example: 0.05 […]
Read MorePower Transfer Angle Calculator Power Transfer Angle Calculator Calculate the power transfer angle using: \[ \delta = \sin^{-1}\left(\frac{P\,X}{V_1V_2}\right) \] where \(P\) is the transmitted power, \(V_1\) and \(V_2\) are the voltages, and \(X\) is the line reactance. * Enter the power, voltages, and reactance. Make sure \(\frac{P\,X}{V_1V_2} \le 1\). Step 1: Enter Parameters Transferred Power, […]
Read MoreRectangular Waveguide Breakdown Power Calculator Rectangular Waveguide Breakdown Power Calculator Calculate the maximum power before breakdown using: \[ P_{\text{max}} = \frac{a\,b}{4\,Z_0} \, E_{\text{max}}^2 \, \sqrt{1-\left(\frac{f_c}{f}\right)^2} \] with \( f_c = \frac{c}{2a} \). * Enter the waveguide dimensions \(a\) and \(b\) (m), the operating frequency \(f\) (GHz), and the maximum electric field \(E_{\text{max}}\) (V/m). Step 1: […]
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