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Ham Salad
This document discusses homemade ("QRP") radio design and recipes. It provides examples of radios the author likes, including common themes in QRP design focusing on manufacturability, components, ergonomics, efficiency and durability. The author shares several of their own projects and "secret ingredients" used in QRP radio design, such as class-E power amplifiers, logic chips for RF devices, and filter design. The document promotes originality and having fun in amateur radio design.
Waveguides12
electromagnetic wave in the hollow metallic pipe. And the waveguide introduction. numerical and the application the microwave radar system
Cancer Effect using Microwave
Another awareness to be reminded to all of us out there to better use of the microwave and our foods so that no cancer and other illness from using it.
Class e power amplifiers for qrp2 qro
Class-E power amplifiers can operate with up to 90% efficiency, significantly higher than typical 50% efficiency of other amplifier designs. This results in lower power consumption and transistor heating. Class-E amplifiers use a tuned drain network and operate the transistor as a switch to achieve high efficiency. The design involves selecting component values using published equations to achieve the specially-shaped voltage and current waveforms. Class-E amplifiers are well-suited for efficient QRP transmitters but are not as suitable for multi-band or linear amplifier applications.
219272664 s-parameters
This document discusses microwave junctions and S-parameters. It provides information on:
1) Power dividers and directional couplers which are passive microwave components used for power division or combining. S-parameters are used to define the power relationships between ports.
2) The scattering matrix (S-matrix) is a matrix that defines the power relationships between ports in terms of incident and reflected voltage waves. It is commonly used for microwave analysis since direct voltage and current measurements are difficult at high frequencies.
3) Examples are provided to demonstrate calculating S-matrix coefficients for different microwave junction configurations like E-plane and H-plane tee junctions. Properties of reciprocal and lossless networks in relation to the S
Wave guide tees
Waveguide tees are used in microwave technologies to split or extract power in a waveguide. There are several types of waveguide tees that affect the energy in different ways, including H-type, E-type, magic T, and hybrid ring tees. E-type tees produce outputs that are 180 degrees out of phase, while H-type tees produce in-phase outputs. Magic T tees combine properties of H-type and E-type tees. Hybrid ring tees overcome power limitations of magic T tees using a circular waveguide design.
Power Divider
1. Power dividers are microwave components that divide input power between output ports. Common types include T-junction, Wilkinson, and multi-section broadband dividers. T-junction dividers can be lossless or lossy. Wilkinson dividers provide isolation between output ports.
2. Directional couplers are 4-port networks that divide power between through and coupled ports. They use quarter-wave length lines and even-odd mode analysis. Voltage ratios define coupling factors. Multisection designs provide broadband operation.
3. Hybrids like the quadrature and ring hybrids are 90 or 180 degree hybrids based on symmetric/asymmetric port designs and even-odd mode analysis to provide specific scattering
Empfohlen
Ham Salad
This document discusses homemade ("QRP") radio design and recipes. It provides examples of radios the author likes, including common themes in QRP design focusing on manufacturability, components, ergonomics, efficiency and durability. The author shares several of their own projects and "secret ingredients" used in QRP radio design, such as class-E power amplifiers, logic chips for RF devices, and filter design. The document promotes originality and having fun in amateur radio design.
Waveguides12
electromagnetic wave in the hollow metallic pipe. And the waveguide introduction. numerical and the application the microwave radar system
Cancer Effect using Microwave
Another awareness to be reminded to all of us out there to better use of the microwave and our foods so that no cancer and other illness from using it.
Class e power amplifiers for qrp2 qro
Class-E power amplifiers can operate with up to 90% efficiency, significantly higher than typical 50% efficiency of other amplifier designs. This results in lower power consumption and transistor heating. Class-E amplifiers use a tuned drain network and operate the transistor as a switch to achieve high efficiency. The design involves selecting component values using published equations to achieve the specially-shaped voltage and current waveforms. Class-E amplifiers are well-suited for efficient QRP transmitters but are not as suitable for multi-band or linear amplifier applications.
219272664 s-parameters
This document discusses microwave junctions and S-parameters. It provides information on:
1) Power dividers and directional couplers which are passive microwave components used for power division or combining. S-parameters are used to define the power relationships between ports.
2) The scattering matrix (S-matrix) is a matrix that defines the power relationships between ports in terms of incident and reflected voltage waves. It is commonly used for microwave analysis since direct voltage and current measurements are difficult at high frequencies.
3) Examples are provided to demonstrate calculating S-matrix coefficients for different microwave junction configurations like E-plane and H-plane tee junctions. Properties of reciprocal and lossless networks in relation to the S
Wave guide tees
Waveguide tees are used in microwave technologies to split or extract power in a waveguide. There are several types of waveguide tees that affect the energy in different ways, including H-type, E-type, magic T, and hybrid ring tees. E-type tees produce outputs that are 180 degrees out of phase, while H-type tees produce in-phase outputs. Magic T tees combine properties of H-type and E-type tees. Hybrid ring tees overcome power limitations of magic T tees using a circular waveguide design.
Power Divider
1. Power dividers are microwave components that divide input power between output ports. Common types include T-junction, Wilkinson, and multi-section broadband dividers. T-junction dividers can be lossless or lossy. Wilkinson dividers provide isolation between output ports.
2. Directional couplers are 4-port networks that divide power between through and coupled ports. They use quarter-wave length lines and even-odd mode analysis. Voltage ratios define coupling factors. Multisection designs provide broadband operation.
3. Hybrids like the quadrature and ring hybrids are 90 or 180 degree hybrids based on symmetric/asymmetric port designs and even-odd mode analysis to provide specific scattering
Equal Split Wilkinson Power Divider - Project Report
This document describes the design of an equal split Wilkinson power divider with the following specifications: frequency of 2.4 GHz, source and load impedances of 50 ohms, substrate permittivity of 3.38, substrate thickness of 1.524 mm, and conductor thickness of 0.15 mm. It provides background on Wilkinson power dividers, describes the calculation of microstrip line widths and lengths, shows the simulated circuit schematic and layout, and plots the resulting S-parameters which achieve the desired 3 dB power split with good port matching and isolation as expected.
Waveguide presentation
This document contains notes from a presentation on waveguides given to the Department of Telecommunication Engineering at the University of Engineering & Technology Peshawar, Mardan Campus. The presentation covered the history of waveguides, common types of waveguides including parallel plate, rectangular, circular and dielectric waveguides. It also discussed electromagnetic field configurations inside waveguides, possible modes of propagation including TEM, TE, TM and hybrid modes, and how the dimensions of a waveguide determine its operating frequency range.
Waveguide
1. The document discusses various types of waveguides used to transmit electromagnetic waves, including rectangular waveguides, circular waveguides, coaxial lines, optical waveguides, and parallel-plate waveguides.
2. It describes the properties of parallel-plate waveguides, including their TE and TM modes. The TE modes have the electric field parallel to the plates, while the TM modes have the magnetic field parallel to the plates.
3. Cutoff frequencies are discussed, below which modes do not propagate. The cutoff wavelength is the wavelength at which the phase constant is zero.
Waveguides
Rectangular waveguides are the most commonly used form and carry signals above a certain cutoff frequency. They propagate electromagnetic waves in different modes depending on whether the electric or magnetic vector is perpendicular to the propagation direction. For rectangular waveguides, the width determines the lower cutoff frequency and the TE10 mode is the lowest supported. Circular waveguides are less common but used when a rotating element is attached; they support all TEmn and TMmn modes with the dominant mode being TE11.
Loop Antenna
A loop antenna has simple structure but its analysis is not easy to perform. Since a loop antenna is a dual pair of a dipole antenna, we can adopt the analysis of a dipole for a loop based on the duality theorem. By stacking a number of loops, we can increase the antenna gain and radiation resistance very easily.
Directional couplers ppt for microwave engineering
Directional couplers are passive microwave devices that divide power and distribute it through multiple ports. They have four ports: input, through, coupled, and isolated. Power entering the input port splits between the through and coupled ports, with some power coupled out through the coupled port. Directional couplers are characterized by their coupling factor, directivity, and isolation factor. They are used in applications such as power monitoring, signal sampling, and reflection coefficient measurements.
Microwave- directional coupler paramets & applications
A directional coupler is a passive device that couples part of the transmission power from one transmission line to another. It has four ports: input, transmitted, coupled, and isolated. Key parameters are coupling factor, loss, isolation, and directivity. Directional couplers are commonly used to monitor power and frequency without interrupting the main signal, for frequency and power measurements, and combining signals to a receiver when isolation is high.
Seminar on ''Magic tee" by kazi md saidur rahaman
The document describes a seminar report on magic tees. It includes an introduction to magic tees, their structure and operation. It also provides background information on simulating a magic tee using FEKO software. The simulation examined standing wave patterns and S-parameters when either the sigma or delta port was driven. Finally, the document discusses different types of tee junctions including E-plane and H-plane tees as well as their scattering matrices. In summary, the report examines magic tees through simulation and analysis of their properties and scattering parameters.
Microwave engineering basics
The document summarizes key components and concepts in basic microwave engineering. It discusses waveguides and their operating frequencies based on dimensions. It also describes electric and magnetic fields in rectangular waveguides. Additional components summarized include coaxial to waveguide transitions, choke joints, coupling loops, phase shifters, junctions, tuners, mixers, isolators, circulators, directional couplers, and cavity resonators. Isolators, circulators, and directional couplers are multi-port devices that control the direction of signal propagation with differing levels of attenuation.
Microwave Antenna
Microwave antennas can take several forms. Horn antennas are popular and can achieve gains up to 25 dB, with directional patterns. Parabolic antennas, like satellite dishes, typically have very high gain between 30-40 dB and low cross polarization. Slot antennas are often used instead of line antennas for greater pattern control and are found in radar and cell antennas. Dipole antennas are half wave resonant conductors that radiate omnidirectionally at right angles to their axis. Their gain is approximately 2 dBi. Dielectric antennas use a traveling surface wave along a dielectric rod to radiate maximally along the rod axis.
Mwr ppt priyanka
Microwaves are Electromagnetic Waves that follow the frequency range in between of 30 MHz to 300 GHz. Using this principle, only today frequently used Microwave ovens work. this presentation covers not only the basics of Microwaves but has a detailed explanation of wave guides which act as a guide for any microwave. also frequently used terms like guided wavelength, cut-off frequency, phase velocity , etc has been explained.
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Equal Split Wilkinson Power Divider - Project Report
This document describes the design of an equal split Wilkinson power divider with the following specifications: frequency of 2.4 GHz, source and load impedances of 50 ohms, substrate permittivity of 3.38, substrate thickness of 1.524 mm, and conductor thickness of 0.15 mm. It provides background on Wilkinson power dividers, describes the calculation of microstrip line widths and lengths, shows the simulated circuit schematic and layout, and plots the resulting S-parameters which achieve the desired 3 dB power split with good port matching and isolation as expected.
Waveguide presentation
This document contains notes from a presentation on waveguides given to the Department of Telecommunication Engineering at the University of Engineering & Technology Peshawar, Mardan Campus. The presentation covered the history of waveguides, common types of waveguides including parallel plate, rectangular, circular and dielectric waveguides. It also discussed electromagnetic field configurations inside waveguides, possible modes of propagation including TEM, TE, TM and hybrid modes, and how the dimensions of a waveguide determine its operating frequency range.
Waveguide
1. The document discusses various types of waveguides used to transmit electromagnetic waves, including rectangular waveguides, circular waveguides, coaxial lines, optical waveguides, and parallel-plate waveguides.
2. It describes the properties of parallel-plate waveguides, including their TE and TM modes. The TE modes have the electric field parallel to the plates, while the TM modes have the magnetic field parallel to the plates.
3. Cutoff frequencies are discussed, below which modes do not propagate. The cutoff wavelength is the wavelength at which the phase constant is zero.
Waveguides
Rectangular waveguides are the most commonly used form and carry signals above a certain cutoff frequency. They propagate electromagnetic waves in different modes depending on whether the electric or magnetic vector is perpendicular to the propagation direction. For rectangular waveguides, the width determines the lower cutoff frequency and the TE10 mode is the lowest supported. Circular waveguides are less common but used when a rotating element is attached; they support all TEmn and TMmn modes with the dominant mode being TE11.
Loop Antenna
A loop antenna has simple structure but its analysis is not easy to perform. Since a loop antenna is a dual pair of a dipole antenna, we can adopt the analysis of a dipole for a loop based on the duality theorem. By stacking a number of loops, we can increase the antenna gain and radiation resistance very easily.
Directional couplers ppt for microwave engineering
Directional couplers are passive microwave devices that divide power and distribute it through multiple ports. They have four ports: input, through, coupled, and isolated. Power entering the input port splits between the through and coupled ports, with some power coupled out through the coupled port. Directional couplers are characterized by their coupling factor, directivity, and isolation factor. They are used in applications such as power monitoring, signal sampling, and reflection coefficient measurements.
Microwave- directional coupler paramets & applications
A directional coupler is a passive device that couples part of the transmission power from one transmission line to another. It has four ports: input, transmitted, coupled, and isolated. Key parameters are coupling factor, loss, isolation, and directivity. Directional couplers are commonly used to monitor power and frequency without interrupting the main signal, for frequency and power measurements, and combining signals to a receiver when isolation is high.
Seminar on ''Magic tee" by kazi md saidur rahaman
The document describes a seminar report on magic tees. It includes an introduction to magic tees, their structure and operation. It also provides background information on simulating a magic tee using FEKO software. The simulation examined standing wave patterns and S-parameters when either the sigma or delta port was driven. Finally, the document discusses different types of tee junctions including E-plane and H-plane tees as well as their scattering matrices. In summary, the report examines magic tees through simulation and analysis of their properties and scattering parameters.
Microwave engineering basics
The document summarizes key components and concepts in basic microwave engineering. It discusses waveguides and their operating frequencies based on dimensions. It also describes electric and magnetic fields in rectangular waveguides. Additional components summarized include coaxial to waveguide transitions, choke joints, coupling loops, phase shifters, junctions, tuners, mixers, isolators, circulators, directional couplers, and cavity resonators. Isolators, circulators, and directional couplers are multi-port devices that control the direction of signal propagation with differing levels of attenuation.
Microwave Antenna
Microwave antennas can take several forms. Horn antennas are popular and can achieve gains up to 25 dB, with directional patterns. Parabolic antennas, like satellite dishes, typically have very high gain between 30-40 dB and low cross polarization. Slot antennas are often used instead of line antennas for greater pattern control and are found in radar and cell antennas. Dipole antennas are half wave resonant conductors that radiate omnidirectionally at right angles to their axis. Their gain is approximately 2 dBi. Dielectric antennas use a traveling surface wave along a dielectric rod to radiate maximally along the rod axis.
Mwr ppt priyanka
Microwaves are Electromagnetic Waves that follow the frequency range in between of 30 MHz to 300 GHz. Using this principle, only today frequently used Microwave ovens work. this presentation covers not only the basics of Microwaves but has a detailed explanation of wave guides which act as a guide for any microwave. also frequently used terms like guided wavelength, cut-off frequency, phase velocity , etc has been explained.
Andere mochten auch (11)
Equal Split Wilkinson Power Divider - Project Report
Equal Split Wilkinson Power Divider - Project Report
Directional couplers ppt for microwave engineering
Directional couplers ppt for microwave engineering
Microwave- directional coupler paramets & applications
Microwave- directional coupler paramets & applications