How do you calculate radiated energy? The radiated energy can be calculated using the formula: Energy (J)=Power (W)×Time (s)Energy (J)=Power (W)×Time (s). 55 for most antennas); D — dish diameter; λ — wavelength; Φ — wave arrival angle;Microstrip Impedance Calculator. 1: 300-to- 50 Ω match using an quarter-wave section of line. This will also provide the time delay the cable provides for a signal and also the capacitance and inductance per. The TEM wavelength (λ) depends upon the frequency and relative permittivity (εr) medium (like waveguide/ stripline. This general RF calculator includes calculations of path loss, VSWR and wavelength as well as conversions between many common terms used in the wireless industry. 95. Since one wavelength equals 360 degrees. 1 3RG-8 and RG-213 (50 ohm); and RG-11 (75 ohm) are about 0. 6. Microstrip line is a widely used transmission line and for the appropriate transmission its characteristic impedance has to be calculated while using it in RF design & circuits. )For a Signal Traveling in Free Space - *λ = c (Speed of Light) / f (frequency). Though the calculation is done using the RF calculators. In that case, we find that the angles at which we find constructive interference are given by the equation:Result. Conversion Tables. Even a ¼ wavelength antenna at kHz frequencies is impractical at around 10,000 ft long. Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Pasternack's RF Skin Depth Calculator are measurement calculation tools that allow you to input custom values, or choose from a list of commonly used material. Doppler effect is widely used in medicine – it allows us to measure the blood flow in arteries and veins, perform ultrasound, and it also has a great purpose when dealing with how to calculate cardiac output with echocardiography doppler. Enter your desired frequency (MHz) of operation (i. f. Canadian Radio. Methods of RF Field Calculation used in MRI with Consideration of the Sample. Frequency and Wavelength Calculation. These include: Conversion: dBm To Watt Calculator | Frequency to Wavelength | Noise Figure to Noise Temperature Calculator | Noise Temperature to Noise Figure Converter | Watt To dBm Calculator | Wavelength to Frequency. greater or less than 60 dB, and whether the frequency is greater or less than 100 MHz. The antenna factor describes the connection between the electric field intensity E around the antenna and the antenna's voltage output V. If you measure the hole diameters in the screen that sits in front of the window in the door of the oven, you'll have your answer. While a solid plane of material is best, cages made from mesh are common. I expect it will require a transmit signal attenuation of about 40 dB, to hide a card. You may rearrange this formula to calculate the frequency from the wavelength. The VHF Television Band has 12 RF channels, and has been in use since 1947. RF wavelength calculations can be made quite simple with two basic formulas. Wavelength Calculator. 3/4 and 1 1/4 and 1 3/4 and so on are also. G (num) - Normalized Gain. This infomation was given to me by Scott (not me, another one) This general RF calculator includes calculations of path loss, VSWR and wavelength as well as conversions between many common terms used in the wireless industry. Also note that the gain equation is optimized for small angles - see derivation of wavelength portion of equation [7]. 6. Remember to be consistent with the units!Elements must be spaced properly in order to avoid grating lobes. The Line of Sight calculator will determine both the "line of sight distance" and "radio horizon / service range" of an antenna placed at a specific height above the ground, represented by "antenna height (h)" in this equation. 2GHz and calculate the Wavelength. According to WatElectronics "Wireless Radio frequency is any of the electromagnetic wave frequencies around 3 kHz-300 GHz". , decibels) π = 3. Choose a calculation to use the wavelength equation λ = v/f to solve for wavelength λ, velocity v or frequency f. A television station broadcast Radio Frequency (RF) channel is allocated 6 MHz of bandwidth for over-the-air transmission in part of the VHF or UHF Radio Frequency Band. Is all that stitching shown in figure really necessary from an RF point of view? Probably not. Ae = Effective antenna aperture in m 2. The circular waveguide supports both TE (transverse electric) and TM (transverse magnetic) modes. The basic formula to calculate the wavelength of an RF signal is: Wavelength = Speed of light / Frequency The speed of light is approximately 300,000 kilometers per second or 186,000 miles per. Following equations are behind the calculations. 0x10^8ms^-1) to put into the formula. Attachments. Advertisement. Bureau/Office: MediaSkin Depth Calculator. 11b channel 6): r = 17. An alternative formula is:Radiofrequency (RF) electromagnetic radiation (EMR) is the transfer of energy by radio waves. Different frequencies go thru different materials differently, but it is not true that lower frequencies (longer wavelengths) "travel farther. The guide wavelength is a function of operating wavelength (or frequency) and the lower cutoff wavelength, and is always longer than the wavelength would be in free-space. 14. Design a transmission line segment that matches 300 Ω to 50 Ω at 10 GHz using a quarter-wave match. λ = Wavelength of EM wave; c 0 = Speed of. The corresponding wavelength is called the EMI shield wavelength. UK Radio Frequency Allocations (graphical) US Radio Frequency Allocations. Result. Helical or Helix Antennas transmit a circular polarized wave. Most of the time I ditch the equations and use experimentation when it comes to RF because it would take longer to calculate what is happening with RF than to actually test it. Waveguide Calculator (Rectangular) Pasternack's Waveguide Calculator provides the cutoff frequency, operating frequency range and closest waveguide size for a rectangular waveguide based on the custom inputted broad wall width. $endgroup$ –Calculate the length of quarter wave antenna for transmission frequency Check Details Antenna calculator length quick dxzone excel xls spreadsheet checks elements trim really much simple way. 55). ν = c λ The wavenumber is also a unit of frequency. ε0 = permittivity of free space = 8. At 870 MHz, λ is 345 mm; The rule of thumb for hole dimension is λ / 20 = 17 mm. 2 lb/kg) = 0. Result. 2. 63e -34 J*s. With specific circuit designs, the calculator also predicts other properties such as wavelength in the circuit, skin depth and thermal rise above ambient. "Wavelength (TEM) Calculator. 99MHz - 1/100. ) between the antenna and the horizon and does not. The resonant frequency of an LC Circuit is the frequency at which the inductive reactance and capacitive reactance of the LC circuit are equal. To use the RF Exposure Calculator fill-in the form below with your operating power antenna gain and the operating frequency. This calculator is used to convert Frequency to Wavelength. 7,506. Time Delay. This can be set to zero, but the calculated loss will not include conductor losses. 7 mA 19. User assumes all risks for its use. 998 × 10 8) G = Antenna gain (Linear value) The effective antenna aperture can be calculated by the following formula when the gain of the antenna is specified in dB (decibels). Then, apply the formula: λ = v/f. 854187817 × 10 −12 F m −1 and the permeability is µ 0 = 4 π × 10 −7 N/A 2. Pasternack's Coaxial Cable Impedance Calculator allows you to enter the Outer Diameter Dielectric width, Inner onductor Diameter width and either the Dielectric Constant or Velocity of Propagation (VoP) values in order to. Dipole. 1-866-PASTERNACK (1-866-727-8376) US and Canada only • +1-949-261-1920 International • Email sales@pasternack. FREQUENCY (f) Out of range value [8. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. Height: Height of the substrate. The following formula is used to calculate the cut-off frequency, lower & higher operational frequency of the rectangular waveguide. A television station broadcast Radio Frequency (RF) channel is allocated 6 MHz of bandwidth for over-the-air transmission in part of the VHF or UHF Radio Frequency Band. For electrically large antennas there. Wavelength calculator 46) L-Network Matching Calculator 47) LCR Parallel - Series Conversion Calculator 48) PI. Often, power consumption and range must be balanced for maximum usability. Frequency (Output) = 857 MHz. The gain of the pyramidal horn antenna gain can be calculated by the following formula. Fairview Microwave's TEM (Transverse Electromagnetic Mode) Wavelength Calculator allows you to determine the wavelength (in millimeters) inside a rectangular wave guide given the frequency and dielectric constant (or VoP) of the input signal. Enter F and F (GHz) Metric (millimeters) English (inches) Advertisement. f 2 = Upper operational frequency in GHz. Power (Input) = 1 Watt Power (Output) = 30 dBm RF Calculator for Frequency calculation Following calculator calcultes RF frequency in MHz for the entered wavelength in. However, this can be automatically converted. 28, Quarter Wavelength = 0. Description. RF Calculator Pro is a utility application consisting of various calculations, conversions and reference tables. Dipole antenna calculatorWhen the length of antenna is a whole wavelength Antenna length wavelength frequency does why[get 45+] dipole. This is a required field. The spacing ( S) is determined. This is simply not correct. Follow edited Mar 6, 2019 at 20:37. For the angular wavenumber (denoted by k ), the formula is: k = 2 π λ = 2 π f v. Radio waves are just a small part of the electromagnetic spectrum. The width of the conducting layer is important to calculate the radiation intensity since it directly affects. MHz. Adding one quarter-wavelength moves you 180 degrees to the right side of the chart, to an open circuit. OUTPUT: Wavelength = 0. Take the square root of the value from step 2. a) Find the shortest wavelength AM radio signal. Łucja Zaborowska, MD, PhD candidate. However, if the observer is away from the. Stripline Calculator. The Link Budget accounts for all factors that affect the transmission of a signal which would include gains and losses from amplifiers, the transmitter, various mediums, up to the sensitivity of the receiver. 8 pF, Inductance = -17. The depth at which the amplitude of the wave is reduced to 1/e ( about 0. Examples of TEM: Free space, Coax, Stripline, Waveguide. The following table provides conversions for wavelength (from frequency), VSWR (from forward and reflected power) and various other useful conversions. An antinode is a point on a standing wave of maximum amplitude. RF Amplifier PAE Calculator; RF Transformer Calculator; Specific Absorption Rate (SAR) Calculator. - Bridged Tee Attenuator Calculator. RF calculations and RF conversions include metric. P = V 2 / R. You may use the formula: Wavelength = c/f, where: c - The speed of light equal to 299,792,458 m/s; and; f - The frequency of the antenna. This blog post provides the formulas and an Excel spreadsheet for calculating the wavelengths for each 20 MHz channel center frequency in the 2. To achieve a matching impedance of 50 Ohm, the ground plane elements are bent down at an angle of 45 degrees and no matching stubs or balans are needed. 492 comes from multipling the frequency by the distance of a 1/2 wavelength. 4. A = Area of aperture in m 2. Since RF systems use decibels referenced from 1 mW, the corresponding voltage increase for every 1 mW power increase can be calculated with another form of Ohm's law: V = (PR) 0. VSWR) • Air core inductors (inductance,. 5 inches OUTPUTS: Capacitance = -1. It include antenna gain calculator, Antenna G/T ratio calculator, coaxial cable Impedance calculator, Noise temperature to Noise Figure Converter, Radar Range Calculator, resonant frequency calculator, wavelength to frequency calculator, receiver C/N ratio,. Watt To dBm Calculator. 3/4 λ. Enter the Wavelength, Number of Turns and the space between each coil to calculate the Antenna Gain, wire diameter, Half Power Beam Width, Beam Width First Nulls and Effective Apperature. Er. 4 GHz. Radar cross-section ), denoted σ, also called , is a measure of how detectable an object is by . This will equal the length of each leg of the antenna. Noise Temperature to Noise Figure Converter. 7/8 λ. Try 142. Microstrip Impedance Calculator Enter the Height, Width and Permittivity to get the Impedance of the Microstrip Note : The unit of the height and width entered must be the same. Radio Frequency Power Conversion Calculator . Here's the equation for guide wavelength: Guide wavelength is used when you design distributed structures in waveguide. The ITU Radio Frequency to Wavelength conversion tool allows you to enter a frequency from 8. MHz. This impedance is used to calculate the depth ( D) into the patch antenna. In the text, you'll also find the frequency definition, two frequency formulas (period to frequency and wavelength to frequency), and a few. To calculate the height above ground, you need to subtract the result from a line drawn directly between the tops of the two towers. These radio waves are electromagnetic radiations that travel through the air at specific frequencies. 62607015E-34 m² · kg/s. The regions depend on the maximum linear dimension of the antenna and the wavelength. , n) is: Where, R = Radius of the Fresnel Zone in m/ft. The substrate parameters (ε r and h) and the frequency of interest are required. Scroll to View . Enter numbers, decimals or scientific notation as in 4. RF Calculator for Calculation / Conversion of Common RF Terms RF calculators and converters. The NIST and Michigan researchers mapped field strength as a function of position at resolutions as low as one-hundredth of an RF wavelength, far below normal. Yes - Enter the Velocity Factor or, select one. Home › EIA WR 284 Calculator. Get the wavelength calculator available online only. εr (relative permittivity) This is a required field. Bureau/Office: Media Skin Depth Calculator. 8 × 10 − 7 m. The wavelength is the distance between repeating units of a wave pattern. shielding up to 40 GHz would require vent holes smaller than. Friis at Bell Labs in 1945. 8dB. The advantages of coplanar waveguide are that active devices can be mounted on top of the circuit, like on. NEW Version V2323, released on 31 May 2023, FREE DOWNLOAD, WinRFCalc is the best Windows RF calculator toolbox for EMC, RF and Radio engineers. Because the speed of light in a copper wire or cable is lower by factor of about 0. Electromagnetic waves can be characterized by a wavelength and a frequency. kHz MHz GHz. Frequency Wavelength Calculator. However, it rarely causes any problem at low speeds. A tool designed to calculate skin depth based on the conductive material being used and the frequency of the signal. The cut-off wavelength distribution diagram of each mode of the circular waveguide is shown in the figure. All are in Adobe PDF file format. Wavelength (λ): The calculator returns the wavelength in meters. The Velocity Factor (VF) of my 300 ohm twinlead is 0. v. Here we will briefly review some of the wide variety of methods used to calculate RF electromagnetic fields in MRI with reference to examples in the literature. This calculator helps you calculate the characteristic impedance of a coaxial cable given its dimensions. There are usually four radials, three being a minimum, but you could use up to six. To calculate the speed of sound in a medium, follow these steps: Find the sound's wavelength (λ) and frequency (f) in the medium. Wavelength. The Number that follows "WR" is the width of the waveguide opening in mils, divided by 10. The formula used in the Far-Field Calculator is: d F = λ 2 ⋅ D 2 Example. 45 for gold. The antenna factor describes the connection between the electric field intensity E around the antenna and the antenna's voltage output V. 10Log 10 [P] = 20Log 10 [V] - 10Log 10 [50 Ω ] Note, the resistance of 50 used above reflects that RF systems are matched to 50Ω. 01MHz). With this calculator tool you can calculate the resonance frequency of a a cavity ( rectangular or cylindrical ) and a structure on a PCB. . It gets complicated. The TE 10 mode of propagation is the lowest mode that is supported. 185, you wish to calculate and then select the. 3GHz), Output Doppler Frequency (Hz) = 20000 i. 1. 020 - Updated: 2023 - mwave. 13,573. This relationship, however, doesn't hold for real-world situations. Yes, you can calculate the wavelength of a dipole. Here is a list of some of the calculators in this app: Attenuator Calculators - Pi Attenuator Calculator - Tee Attenuator Calculator - Balanced Attenuator Calculator -. Try our […] Pasternack online RF calculators , conversions and formulas are well suited for radio frequency designers and engineers who need answers to complex RF questions. Substitute these values into the wavelength equation λ = v/f. When in doubt, use 1 for copper, . Limitations and features of antenna calculations. The waveguide width determines the lower cutoff frequency and is equal (ideally) to ½ wavelength of the lower cutoff frequency. This page convert and calculate wavelength. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. If you have no particular preference within a given ham radio band, then simply enter its center frequency (i. Here we will briefly review some of the wide variety of methods used to calculate RF electromagnetic fields in MRI with reference to examples in the literature. Operating above the cut-off frequency that results in interference in signal propagation. PIM. The Wavelength Calculator provides a general purpose utility for determining the Free Space Wavelength, Characteristic Impedance, and Velocity of Light for a plane wave at a user defined frequency ( f) in a Region that is Uniformly Filled with a dielectric material that is also defined by the user by entering the Relative Permittivity and. It is the output power when. . Enter the values of operating frequency and relative dielectric constant then click on calculate to get the effective dielectric constant and guide wavelength for any slotline. Everything RF. A waveguide with a circular cross-section is known as a circular waveguide. The Frequency from Wavelength calculator computes the RF frequency (ν) based on the wavelength (λ) and the speed of light (c). How much gain does a 1/4 wave antenna have?Now we will solve the same problem using our free space path loss calculator: Input the distance between the transmitter and receiver antennas (35,863 km). I leave it to other sources to provide the complex equations needed to precisely model coaxial cables. Target RCS. one conversion factor into the other by calculating 1 divided by the conversion factor. 2. 98 m. Below the cutoff frequency, power flow will be reduced. Instant free online tool for gigahertz to wavelength in nanometres conversion or vice versa. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a ground plane. So for a 3G cell phone that operates at a frequency of 2. Skin Depth Calculator. Useful for identifying the frequency range of a particular radio band. My doubt is about the RF trace that should have 50 ohms impedance. Wavelength and Frequency is described by this equation: λ = v/f. The Wavelength from Frequency calculator computes the wavelength (λ) based on the RF frequency (ν) and the speed of light (c). Where: Gain (dB) = pyramidal horn antenna gain in dB (i. 3kHz -11. “468” is the constant used to convert frequency in MHz to feet. There are usually four radials, three being a minimum, but you could use up to six. In RF cables, this property is reflected by the value of the so-called. C = Speed of light. 3kHz to 11. Start by calculating the shielding effectiveness (SE) required at the highest frequency and add in the appropriate EMCSM. dBm To Watt Calculator. For example, 100 ppm of 100 MHz represents a variation in frequency of 10 kHz. The band is sometimes subdivided into VHF-Lo (RF 2 - 6), and VHF-Hi (RF 7 - 13). A node is a point on a standing wave of minimum amplitude. Where C is the speed of light and is 3 x 10^8 meter/second. Feel free to use the tool below and let us know if you have any questions or. PPM to Hz Calculator. The Wavelength from Frequency calculator computes the wavelength (λ) based on the RF frequency (ν) and the speed of light (c). Waveguides are transmission lines made from hollow tubes and commonly comes in rectangular or circular form. This tool calculates the matching network necessary to terminate a line of the specified characteristic impedence (Z o) in a specific complex load impedence (R L + jX L) at a specified frequency. —The RF wavelength inside the body is greatly reduced from that in free space, owing to the high dielectric constant of the human body. Wavelength and frequency are related by the following formula: c. 01 and 99. The relationship between wavelength and radio frequency is mentioned below. Equation $$lambda = frac{c}{f sqrt{epsilon_{R}}}$$ or $$lambda = v_{p}frac{c}{f}$$ Where: $$lambda$$ = signal. e. This calculator calculates wavelength in meters from the radio frequency (RF) entered in units of MHz. Conclusion : In. Frequency to Wavelength. Frequency wavelength in millimeters: Download various frequency allocation charts. This calculator computes the trace width of a microstrip given the following information: maximum current, trace thickness, temperature rise, ambient temperature, and length. 2. m. To calculate the wavelength of a periodic oscillating motion, given the frequency, you first need to know the speed of the wave. Wavelength Calculator (TEM) Calculate a wavelength in the presence of a dielectric. Wavelength Calculator : Custom Search Home: Equivalents: Internet Glossary : Assists ham radio operators in converting a frequency to its wavelength in feet or inches. TEM Wavelength Calculator. All About Circuits is the largest online electrical engineering communities in the world with over 700K engineers, who collaborate every day to innovate, design, and create. 65 figure, then look up the data sheet for the speed of signals in your specific type of cable. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley. dB. Select the Frequency value's Dimension. 1 GHz (2. It will also show you what the primary ITU allocation is for that frequency by selecting your desired region in the field below. By understanding the microstrip transmission line, designers can. , the power level of 0dBm represents 1milliwatt). A few basic facts about waveguide: Here are Waveguide Equations & Fields. 3. RF exposure is found on the FCC’s Office of Engineering and Technology. 65wavelength(in air) If you want more accuracy than that approximate 0. If you want to calculate the Frequency from Wavelength - Click here to use the Wavelength to Frequency Calculator. See the quick-reference table below for. Each surface of the lens acts as an image-forming component and contributes to the final image formed by the lens. This calculator is designed to calculate the signal wavelength in transverse electromagnetic mode if the dielectric constant or the velocity of propagation is known. Impedance Return Path for RF / Micro-wave signals, they WILL find a Path. 96, f represents the frequency in MHz, 0. This can be set to zero, but the calculated loss will not include conductor losses. 4mm PCB for a trace width of 0. Values for L and C will be calculated for the four topologies shown. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. Here is a list of some of the calculators in this app: Attenuator Calculators. Operating above the cut-off frequency that results in interference in signal propagation. A microstrip width calculator can calculate the width of a microstrip. Following table provides links to useful Wireless converters and calculators. • Flux Density of the RF source reaching the surface of the Earth is determined • Additional correction factors for Source Size (Beam Size) and Atmospheric Attenuation are calculated • These values are then used to calculate a G/T for the antenna Revision: A. To find the half wave, divide that number by two. These files are fairly large, some over 1 meg. Fairview Microwave's Waveguide Calculator provides the cutoff frequency, operating frequency range and closest waveguide size for a rectangular waveguide based on the custom inputted broad wall width. What is amplitude in maths?Link Budget is a way of quantifying a communication link's performance while accounting for the system's power, gains, and losses for both the transmitter (Tx) and receiver (Rx). These are considered to be standardized impedance values with cables readily available. dBm stands for decibel-milliwatts; is a dimensionless unit used to define/measure signal strength (power level), with reference to 1 milliwatt. In the absence of obstacles and without atmospheric attenuation the total power passing through the surface of a sphere centered on a transmitter is equal to the power transmitted. Many of our dipole antennas have adjustable element lengths and by entering the frequency of interest this calculator will calculate the wavelength (or element length) corresponding. Please visit RFconnector. Antenna beamwidth determines the expected signal strength given the direction and radiation distance of an antenna. The Television. v is the frequency in hertz. 4. Everything RF has a page dedicated to calculators for RF applications. 4 MHz (in free space). Waves are signals that travel through air, water, light, and even. The Pasternack wavelength calculator Transverse Electromagnetic Mode (TEM) allows you to determine the wavelength (in millimeters) inside a rectangular waveguide. This calculator is designed to calculate the wavelength of any frequency signal. The RF link is between a transmit antenna and a receive antenna. Radiation: • Electromagnetic wave (wavelength, frequency, period) • Propagation delay (distance vs. results clearly indicate that any system chassis designed for. This blog post provides the formulas and an Excel spreadsheet for calculating the wavelengths for each 20 MHz channel center frequency in the 2. Suppose your network was a short circuit, the left "corner" of the Smith Chart. You can choose a wave velocity from the preset list, so you don't have to remember. This calculator is designed to convert the values of Radio Frequency power in watts to. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. 35*0. This can be achieved by regulating the inner and outer diameter of the coaxial cable, along with the. This is a required field. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. Understanding beamwidth and how it influences a test. The result will then be displayed in the. The calculator below provides an inset feedline distance for a given antenna impedance and feedline impedance. Write down the inductance L in henries. milli. You can use the frequency calculator to determine the frequency if you know the wavelength. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great. The link budget is an important value that enables engineers to design systems based on the required sensitivity of a receiver at a. Frequency. Then, multiply the values of L and l by 0. Stack Exchange Network. There are many other factors that will come in to play when doing this in the real world. Frequency Calculator. 5 MHz. All Conversion Calculators. Where L is the length of the dipoles. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. 1 meters. λ - Wavelength. As the name suggests, the length of this transmission line if fixed at a quarter of the wavelength (λ/4). 19. This is a required field. 43 cm: Power Rating (Megawatts) 1. The length of the dipole is usually one-half of the wavelength of the RF signals. “468” is the constant used to convert frequency in MHz to feet. Frequency ‹―› Wavelength Calculator. 99 MHz, respectively. a, b, h = Cavity width, length, height in mm/cm/Inch. 41) Voltage Divider Calculator. The result will then be displayed in the answer box along with a dynamic conversion scale to show how wavelength varies for different frequencies, above and below the entered value. Power in excess of 200 watts can develop very high RF voltages. The relation of frequency and wavelength in a radio wave traveling in vacuum or air is. dBm To Watt Calculator. We've set it to $$343. 2. A radiation calculator is a tool or formula used to calculate various properties of radiation, such as frequency, wavelength, energy, or power. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,.