There is one more term which is often used interchangeably to mention RF and is called 'wavelength'. Hz to PPM Calculator. Frequency to Wavelength Calculator. Cutoff Frequency Calculator. For such an antenna, the near field is the region within a radius r ≪ λ, while the. An antenna with single straight rod is the whip antenna. RF Calculator: Wavelength, dBm, dBuV, W, dBuV/m, mW/cm^2, pJ/cm^2, V & VSWR This RF calculator has been developed by Compliance Engineering as a resource for individuals involved in EMC and RF compliance measurements. This relationship, however, doesn't hold for real-world situations. (18 Feet = 1/2 wavelength) 27. Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. Our website uses cookies. Assume microstrip line for which propagation occurs with. Conclusion : In. 01 November 2023, 18:15 CEST. The Frequency from Wavelength calculator computes the RF frequency (ν) based on the wavelength (λ) and the speed of light (c). Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light. 3. **Note: All of our calculators allow SI prefix input. Following calculator calculates lowest cutoff frequency of rectangular waveguide as per TE10 mode and equation-2 that is Fc = c/2a , where 'c' is speed of light and 'a' is large dimension of waveguide. We are there to assist. Simple RF Range Calculator provides fast and accurate result as the customer selected the frequency band and set TX and RX parameters. 98 m. This can be easily calculated by hand or by using an online calculator. Enter the frequency number, by default 27. Np = Number of turns in the primary coil. When the waveguide radius a is constant, the order of the modes remains unchanged. RF reflection becomes a concern when the trace or conductor’s length is equal to or larger than 1/4 of the signal’s wavelength. Formula. If the medium in which the light (or radio wave) is traveling is something other than free space, the velocity factor of the medium can slow down the speed of light. These files are fairly large, some over 1 meg. Use the frequency calculator below to convert. For electrically large antennas there. Following equations are behind the calculations. RF_N CC2420 BALUN TX/RX Switch ANT PA LP filter TX path RX path Control logic and bias network RX current 19. 0. This antenna wavelength calculator can be used to determine the physical length of an antenna’s electromagnetic wave in free space. ε 0 = 8. Independent of wavelength – A very strong function of R – A linear function of everything else. This tool converts from Wavelength in nm, um, mm, cm, m, inches or feet to Frequency in. 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). Free Space Path Loss Calculator. 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. Do all your RF calculations using this application. 75, Radiation Resistance = 347. 1, makes the argument that a circuit with resistors, inductors, and capacitors is a good model for a transmission line. Feel free to use the tool below and let us know if you have any questions or. Let us first define what a Radar Simulation range is. The Wavelength from Frequency calculator computes the wavelength (λ) based on the RF frequency (ν) and the speed of light (c). k=frac {2pi} {lambda}=frac {2pi f} {v} k = λ2π. Target range. 5 Hz This wavelength to frequency calculator helps determine the frequency of a waveform based on its wavelength. Helical or Helix Antennas transmit a circular polarized wave. This online plane wave calculator calculates the phase velocity Vp (m/s), wavelength λ (meter (s)), and wave impedance (Ω) of the plane wave by entering the value of relative permittivity (εr), relative permeability (μr) of the medium, and frequency (MHz/GHz). 223 V = 223000 µV. Operating above the cut-off frequency that results in interference in signal propagation. This is a required field. f f = frequency. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. 4cm. This can be easily calculated by hand or by using an online calculator. Full Half-Wavelength Dipole: For optimal performance over average ground, the half-wave dipole should be installed a minimum of 1/2 wavelength above ground. Stack Exchange Network. 2. 2. 37) compared to the amplitude at the surface is called the "skin depth". To fully understand the results obtained by this calculator, please take a few minutes to read the. In addition, because of the rain drop's shape and its relative size compared to the RF signal. This distance is denoted by R. Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. EXAMPLE of Whip Antenna Calculator: INPUTS : Frequency = 900 MHz, Length = 12 inches, Diameter = 0. Marki Microwave's Tools is a collection of free online applications for RF analysis and synthesis that are easy to use and mobile-friendly. Cut-off Frequency (fc) GHz. When electromagnetic radiation is incident on the. This is a required field. One rule of thumb often used for Faraday cages to prevent transmission is that the holes need to be no larger than 1/10 of the wavelength of the signal. To fully understand the results obtained by this calculator, please take a few minutes to read the. Noise Figure to Noise Temperature Converter. = v2πf. The formula to calculate the 1/4 wavelength of an antenna for a specific frequency is approximately: Wavelength (λ) = Speed of Light (c) / Frequency (f). PIM. 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 calculate the power density of an antenna, one must measure the power/square cm, in space, from the center of the antenna. Small relative to the wavelength is more complex Below 30 MHz, the wavelengths are 10 meters or longer, so, almost everything is electrically small From 30 to 300 MHz, the wavelength varies from 10 meters to one meter. Formulas and Calculations. Or does this generate a kind of service I have to contract a RF designer to calculate them to me? Regards. Since the area of the sphere of radius (r). 3. Applies to Transverse ElectroMagnetic propagation. λ=wavelength in meters t=thickness Round apertures do not use the same formula. 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. This Doppler effect calculator is a simple tool to determine the apparent frequency or observed frequency of a wave when its source or the receiver is in motion: Enter the emitted frequency value. results clearly indicate that any system chassis designed for. Here you can calculate the period with respect to the amplitude-phase shift period calculator in a span of seconds. The Frequency from Wavelength calculator computes the RF frequency (ν) based on the wavelength (λ) and the speed of light (c). 2 = 57. Large selection of online interactive calculators for RF design, including attenuators, capacitance, resonance, RF traps, and microstrip impedance. Following table provides links to useful Wireless converters and calculators. , decibels) π = 3. Enter your desired frequency (MHz) of operation (i. Follow edited Mar 6, 2019 at 20:37. The regions depend on the maximum linear dimension of the antenna and the wavelength. 492 comes from multipling the frequency by the distance of a 1/2 wavelength. This dipole antenna calculator determines the size of a simple dipole antenna for a given frequency and the dipole wire diameter. 1 meters. 13,573. )It may NOT be what we had in mind. 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. This calculator utilises the diameter of the reflector and the operating frequency to calculate critical antenna characteristics such as gain, HPBW, and. Then you learned poorly. 3048 to convert them to meters. The coax cable is a means for transferring your RF signal to the radiating portion of the radio system. That means on ten mil (254 micron) alumina, the width for fifty ohm microstrip will be about 9. Wavelength to Frequency Calculator. So for a 3G cell phone that operates at a frequency of 2. This example is for TE 1,0 (the mode with the lowest cutoff frequency) in WR284. Ae = Effective antenna aperture in m 2. The length of the dipole is usually one-half of the wavelength of the RF signals. Calculates the wavelength from frequency and vice versa. Description. For example, 5 mW is equal to 7 dBm, and 100 KW is equal to 80 dBm. εr (relative permittivity) This is a required field. The relationship between wavelength and radio frequency is mentioned below. The radar blind speed is the speed at which the target will not be visible to the radar. TX Output Power and RX Sensitivity need to set up based on the radio device’s actual link parameters based on the data sheet. . λ (Lambda) = Wavelength in meters. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. 25fc . Radar Doppler Calculator. Start by calculating the shielding effectiveness (SE) required at the highest frequency and add in the appropriate EMCSM. If you want to calculate. 65c/frequency = 0. RF calculations and conversions include metric-standard, link. Characteristic Impedance. Figure 2 wavelength formula triangle. 2 lb/kg) = 0. 01MHz). The length of a half-wavelength dipole can be calculated by the given formula: L =. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. For an array of apertures the complete formula is: SEdB=K log10 λ/2 L - 20 log n L. 4. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. 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. To calculate the speed of sound in a medium, follow these steps: Find the sound's wavelength (λ) and frequency (f) in the medium. 25 mm/h for very light rain to over 50 mm/h for extreme rains. Enter the input and output impedances to be matched and the centre frequency. 6 W/kg). FREQUENCY TO WAVELENGTH CALCULATOR. Be sure your feedlines and antenna hardware can handle the power. Radio Frequency Engineering Calculator. The VHF Television Band has 12 RF channels, and has been in use since 1947. Equation $$\lambda = \frac{c}{f \sqrt{\epsilon_{R}}}$$ or $$\lambda = v_{p}\frac{c}{f}$$ Where: $$\lambda$$ = signal wavelength The reason it’s not exactly half wavelength (35 cm in this case) is because of the end effect* and a resulting multiplication by 0. dB. 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. Then, multiply the values of L and l by 0. 4/3 λ (Hentenna circ. To calculate the skin effect (or skin depth), follow the given instructions: Multiply the frequency of the signal with the relative permeability of the conductor, the permeability of free space, and π. 35*0. 39) Capacitor Charge Calculator. , decibels) π = 3. It is well beyond the. Frequency - Wavelength Conversion Table. Wave Characteristics . 01 and 99. Multiply the sound's wavelength by its frequency to obtain the speed of sound (v): v = λ ⋅ f. e. The loss calculation is divided into conductor loss and dielectric loss. The relation of frequency and wavelength in a radio wave traveling in vacuum or air is. 0x10^8ms^-1) to put into the formula. 99792458 * 10 8 meters/second. A Velocity Factor can be applied if you are working with coaxial cables. Wavelength (λ): The calculator returns the wavelength in meters. Specific Absorption Rate (SAR) for Wireless Phones and Devices Available at FCC Web Site. e. c = Speed of Light (299,792,458 m/s) f = Frequency. Frequency wavelength in millimeters: Download various frequency allocation charts. . 65} {f} L = f 142. A variant of coplanar waveguide is formed when a ground plane is provided on the opposite side of the dielectric, which is called finite ground-plane coplanar waveguide (FGCPW), or more simply, grounded coplanar waveguide (GCPW). If you want to calculate the Frequency from Wavelength - Click here to use the Wavelength to Frequency Calculator. Formula for Antenna Near Field & Far Field Distance Calculator. 6 Propagation Model in the Mobile Environment. Here's the equation for guide wavelength: Guide wavelength is used when you design distributed structures in waveguide. RF Amplifier PAE Calculator; RF Transformer Calculator; Specific Absorption Rate (SAR) Calculator. This calculator uses the. 8 in) = 62. Frequency to Wavelength Calculator. 4 (for typical FR-4. 8 × 10 − 7 m. 185 megahertz is channel 19, the highway channel, of the Citizens Band Radio Service. Frequency. However, if the observer is away from the. Example 3. Even a ¼ wavelength antenna at kHz frequencies is impractical at around 10,000 ft long. 455 kg/lb You can also convert Type B units into Type A by dividing the amount of Type B units by the conversion factor from Type A to Type B:Conversion Calculator: ppm to Hz. e. Example: Calculate the effective antenna aperture of the Russian RT-70 radio telescope in Crimea (Russia): its antenna gain is 69. Also note that the gain equation is optimized for small angles - see derivation of wavelength portion of equation [7]. Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Using the formula: The relationship between wavelength and frequency of an RF signal is the speed of light. Enter the time delay in receiving an electromagnetic wave from the location of the emitting source, along with selecting the relevant measurement unit of time, and then select the required distance measurement unit to calculate the corresponding distance between the receiver and the emission source . This Doppler effect calculator is a simple tool to determine the apparent frequency or observed frequency of a wave when its source or the receiver is in motion: Enter the emitted frequency value. This calculator will help you calculate the guided wavelength, provided the dimensions of the microstrip are given as well as the velocity of propagation, the microstrip material's dielectric constant, and the input frequency. EIRP (Effective Isotropic Radiated Power) is the measured radiated power of an antenna in a specific direction. RF Calculator This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common measurements used in the wireless industry. D is the inside diameter of the coax cable shield,. 3kHz -11. 2 ext { m/s} by default, the speed of sound, but feel free to enter a. This tool that will calculate the near-field and far-field distances based on the antenna dimension and wavelength. 95. 5dB loss per 100 feet at 146 MHz). S. Formula. dBm To Watt Calculator. Coupling to Direct Line Insertion Loss Conversion Table for Directional Couplers. LTE is the upgrade to both GSM/UMTS networks and CDMA2000 networks. Frequency to Wavelength Calculator. Applies to Transverse ElectroMagnetic propagation. 2. The length of RF waves impacts antenna design decisions. 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. The LTE standard and the frequency bands have been. more ->Since light is an electromagnetic wave, the speed of the wave is 3 × 10 8 m / s and the equation f = v λ can be used. 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). Share. This property is commonly used when referring to the longest wavelengths, the radio spectrum from a few Hz up to the THz range. An antinode is a point on a standing wave of maximum amplitude. v v = wave velocity; and. 74 to. The gain of the pyramidal horn antenna gain can be calculated by the following formula. 3 is accepted only if it is larger than R is usually computed for the boresight. The wavelength calculator solves for wavelength, velocity or frequency given 2 known variables. Taking the end effect into account. I found one reference that: "Faraday cages are usually designed so that the largest mesh openings have a diameter of 1/10 of the shortest wavelength. Unequal-split Power Divider Calculator. RF Coaxial Goosenecks; Filter Modules, Diplexers, & Triplexers; Markets Served . 7,506. 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. Speed of light = (frequency) * (wavelength), where frequency is in Hz, wavelength in meters, and speed of light = 2. 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. Learn more about waves in our wavelength calculator or our frequency calculator. 45 for gold. Methods of RF Field Calculation used in MRI with Consideration of the Sample. Where: Gain (dB) = Gain of the conical horn antenna in dB (i. 2 MHz Golden Gate Bridge (6,450 ft) = 153 kHz Earth Equatorial Diameter (7,926 mi) = 23. Examples of TEM: Free space, Coax, Stripline, Waveguide. 4 GHz and 5 GHz bands. One wavelength equals the speed of light divided by the frequency. 55). 2GHz and calculate the Wavelength. Also, use the reflector length of 0. Impedance Return Path for RF / Micro-wave signals, they WILL find a Path. dBm To Watt Calculator. Here is a simple JavaScript routine that converts between frequency and wavelength in the electromagnetic field realm. Though the calculation is done using the RF calculators. 3kHz to 11. 4mm. This parameter is termed as the propagation delay. The Antenna Near Field & Far Field Distance Calculator will calculate the distance of the three main EM (electromagnetic) fields which surround an antenna, as well as estimate the wavelength of the antenna at a given frequency. 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. f if the frequency of the RF signals. 16 RF / Microwave Design - Basics)Signal Wavelength - *Wavelength (λ) of a Signal is the Distance it Travels in the Time of One Cycle. Wavelength. λ = Wavelength. 65c/frequency = 0. The cutoff frequency is the frequency up to which the system functions efficiently. Communication signals operate at different frequencies, and you’re able to get the clock period by inverting the frequency value. Is the Doppler effect sound affected by wavelength? The doppler shift induces a wavelength shift at the wave's origin (the source frequency remains constant) Only the wavelength changes for the travelling observer (in the source), whereas both frequency and wavelength change for the stationary observer (experiencing the doppler. Disclaimer: This calculator has been tested and is believed to be accurate to 6 significant figures. 95: Cut Off for TE 10 Mode: Frequency: 2. The frequency and the wavelength are intimately related, so the operating frequency has just as much to do with the via spacing as the wavelength does. This is related to the question how can electromagnetic waves reach a cell phone in faraday cage?, where in the answer it was stated that the holes (=size of the mesh) would need to be smaller than that of the wavelengths of the EM radiation used for cell phone signals for attenuation to 'start'. 5 MHz. These radio waves are electromagnetic radiations that travel through the air at specific frequencies. Published in association with. Relative Dielectric Constant (έr) This is a required field. Waveguide Calculators. × 10 −12 F/m is the. The ITU Radio Frequency to Wavelength conversion tool allows you to enter a frequency from 8. The resonant frequency formula is: Where. RF calculations and conversions include metric-standard, link. Frequency: Frequency at which the stripline is analyzed or. Our RF calculators and converters will provide the figures you need for your radio frequency engineering needs. This impedance is used to calculate the depth ( D) into the patch antenna. The wavelength calculator solves for wavelength, velocity or frequency given 2 known variables. 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 are considered to be standardized impedance values with cables readily available. v. —The RF wavelength inside the body is greatly reduced from that in free space, owing to the high dielectric constant of the human body. By the time you have added a quarter-wavelength, you have gone 180 degrees about the center of the Smith chart. 2GHz]1/4 wave antenna can be calculated by frequency, the formula is: antenna length (in meters) = (300/f)*0. The gigahertz [GHz] to wavelength in nanometres [nm] conversion table and conversion steps are also listed. A radiation calculator is a tool or formula used to calculate various properties of radiation, such as frequency, wavelength, energy, or power. Waveguides are. RF wavelength calculations can be made quite simple with two basic formulas. Description. The reason it’s not exactly half wavelength (35 cm in this case) is because of the end effect* and a resulting multiplication by 0. 1: Impedance-matching using a quarter-wavelength transmission line. sales@minicircuits. Frequency in MHz:Distributed Inductance (L') For a coaxial cable, the inductance per unit length L' in henries per meter (H/m) is defined as. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. r = 7. 1/10 λ. Wavelength refers to the distance completed by one full cycle of the electromagnetic wave, while frequency is the number of times the electromagnetic waves pass a given point in one second. Get the free "Frequency Calculator" widget for your website, blog, Wordpress, Blogger, or iGoogle. Antenna gain is more typically listed in an antenna's specification sheet. There is no simple answer, and a lot of times the physical world is vastly more complex than just a few equations. v is the frequency in hertz. TX Power. TEM Wavelength Calculator. GHz. For a parabolic antenna, the gain is calculated by the formula: Ga = 10lg (k (πD / λ)2cos (Φ)) Where: Ga — gain; k — efficiency of antenna surface utilization (approximately 0. 3kHz -11. The input unit of wavelength is meters (this can be modified), the output frequency is calculated in MHz. Wavelength. A tool designed to calculate skin depth based on the conductive material being used and the frequency of the signal. This calculator clears up that confusion to make the conversion between wavelength and frequency easy. The band is sometimes subdivided into VHF-Lo (RF 2 - 6), and VHF-Hi (RF 7 - 13). Result. These are the initial values we feed to the software or the Yagi antenna 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. 495⋋, the dipole length of 0. 3. 96 m 5. This is a calculator yields capacitance, tuning inductance, wavelength, length and radiation resistance. Taking the end effect into account. 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. GHz. com; Products Products. This calculator calculates the maximum range of a radar based on the power transmitted, system gain and receiver sensitivity. λ = Signal wavelength in meter (m) = c/f ( where f = signal frequency, C = speed of light = 2. d is the diameter of the inner conductor of the coax cable; units of D and d must be the same,. n = Fresnel Zone number (>0) λ = c/f = wavelength. MHz. It is the output power when. It calculates power at the receiver and path loss. The benefit of expressing signal strength (power) in dBm is: we can express both very large and very small power values (W) in a short range of number. 04 gigahertz), respectively. Note: Assumes 50 Ohm system. The free space path loss is the loss in signal strength of a signal as it travels through free space. 7, 494, and 983. The unit of radio frequency is Hertz (Hz) i. There are some advantages to using a microstrip transmission line over other alternatives. Radar cross-section ), denoted σ, also called , is a measure of how detectable an object is by . Following doppler frequency formula is used to calculate doppler frequency. They hold the advantage over coaxial cable in terms of ease of manufacturing because of the absence of an inner conductor and shielding. Then, apply the formula: λ = v/f. This relationship between frequency and wavelength is especially important to antenna design because the wavelength of a frequency is used to calculate many of the dimensions of an antenna’s design. With hundreds of coaxial RF cables in-stock and ready to ship worldwide immediately, our coax capacitance calculator lets you calculate the impedance of a coax by allowing you to enter the outer diameter dielectric width and inner conductor diameter. Design, development and small scale manufacture of simple RF and Audio items. For example, f = 10 MHz. At 870 MHz, λ is 345 mm; The rule of thumb for hole dimension is λ / 20 = 17 mm. 90 inches. If the reflection coefficient (Γ) is known, then the VSWR. Waveguide Calculators. greater or less than 60 dB, and whether the frequency is greater or less than 100 MHz. A waveguide with a circular cross-section is known as a circular waveguide. When in doubt, use 1 for copper, . Operating above the cut-off frequency that results in interference in signal propagation. The tool provides two networks that will have the desired impedence at that frequency, but their. Limitations and features of antenna calculations. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great. Wire over Ground Calculator. Pasternack's RF Power Conversion Calculator allows you to convert RF input power and RF output power values from variables such as milliwatts (mW), Watts, dBm, dBW, millivolts (mV), and Volts. Height: Height of the substrate. Power to Voltage. RF Calculators. Er. 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. Lambda is the wavelength D is the distance between transmitter and receiver, or the range 2 2 2 (4) d PGHelical Antenna Design Calculator. 43 cm: Power Rating (Megawatts) 1. Our antenna Power Density Calculator is a measurement tool specifically designed for far-field calculations and will give power density, in Watts per square meter, at a given distance, output power and antenna gain. The cut-off wavelength distribution diagram of each mode of the circular waveguide is shown in the figure. Radio Frequency Power Conversion Calculator . 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. © All Rights Reserved. 2. 4. Here is a list of some of the calculators in this app: Attenuator Calculators - Pi Attenuator Calculator - Tee Attenuator Calculator - Balanced Attenuator Calculator -. The Wavelength from Frequency calculator computes the wavelength (λ) based on the RF frequency (ν) and the speed of light (c). This is a required field. Choose a calculation to use the wavelength equation λ = v/f to solve for wavelength λ, velocity v or frequency f. As you’re probably aware, signals travel on PCB traces with a certain speed. This calculator computes quarter-wave, half-wave, 3/4-wavelength and full-wave dimensions of the coaxial cable segment knowing inner insulation material. 2 \text { m/s} by default, the speed of sound, but feel free to enter a. Zp= Input/Primary impedance. a, b, h = Cavity width, length, height in mm/cm/Inch. 65 figure, then look up the data sheet for the speed of signals in your specific type of cable. 6.