Tyukhtin_RREPS13_presentation
... is traditional in optics and applied very widely for elaboration of different optical devices. It looks natural to use such an approach in theory of particle radiation. However, we must take into account that some of geometrical parameters are not large in comparison with the wavelength. Therefore t ...
... is traditional in optics and applied very widely for elaboration of different optical devices. It looks natural to use such an approach in theory of particle radiation. However, we must take into account that some of geometrical parameters are not large in comparison with the wavelength. Therefore t ...
Advances in Environmental Biology
... The negative impact of low frequency electromagnetic fields on humans, the environment, and territories intended for building is a generally known fact [1-8]. The main sources of low frequency electromagnetic fields (EMF) in urban environment are power lines, power transformer substations, distribut ...
... The negative impact of low frequency electromagnetic fields on humans, the environment, and territories intended for building is a generally known fact [1-8]. The main sources of low frequency electromagnetic fields (EMF) in urban environment are power lines, power transformer substations, distribut ...
Welcome to AntennaSelect How a slot antenna works
... two output ports of the isolated divider remains relatively constant over a relatively wide bandwidth, (usually within a few relative degrees over more than 10% bandwidth). This is an essential characteristic where these power dividers are used to feed both horizontal and vertical radiating elements ...
... two output ports of the isolated divider remains relatively constant over a relatively wide bandwidth, (usually within a few relative degrees over more than 10% bandwidth). This is an essential characteristic where these power dividers are used to feed both horizontal and vertical radiating elements ...
AT4K 2500 Watt Antenna Tuner AT4K 2500 Watt Antenna
... INPUT and ANTENNA controls - Adjust the largest capacitance (highest number) on the output control to keep the losses low, and the voltage that would appear on the antenna capacitor to within 5 kV. 4. Any time a new or different antenna is connected, it is necessary to repeat the turning procedure f ...
... INPUT and ANTENNA controls - Adjust the largest capacitance (highest number) on the output control to keep the losses low, and the voltage that would appear on the antenna capacitor to within 5 kV. 4. Any time a new or different antenna is connected, it is necessary to repeat the turning procedure f ...
The pa0rdt-Mini-Whip ©, an active receiving antenna
... with respect to reception on shortwave. Local noise Before the antenna is dealt with, I want to focus on a key problem: local noise. When listening to weak signals in the longwave you always have to deal with noise. This noise can come from electrical equipment in the immediate vicinity. But it may ...
... with respect to reception on shortwave. Local noise Before the antenna is dealt with, I want to focus on a key problem: local noise. When listening to weak signals in the longwave you always have to deal with noise. This noise can come from electrical equipment in the immediate vicinity. But it may ...
Aalborg Universitet Absorption Efficiency of Receiving Antennas Andersen, Jørgen Bach; Frandsen, Aksel
... are not considered, since most important antenna properties, such as pattern, gain, and impedance, are the same as those for transmitting antennas. However, there are a few situations where the scattering is of importance, and recently there have been discussions in the literature [1], [2] concernin ...
... are not considered, since most important antenna properties, such as pattern, gain, and impedance, are the same as those for transmitting antennas. However, there are a few situations where the scattering is of importance, and recently there have been discussions in the literature [1], [2] concernin ...
![T0C [18]-[37]](http://s1.studyres.com/store/data/008166337_1-ef2f79af58fbac1edd453cde99ece34a-300x300.png)
INTRODUCTION TO SPECTROSCOPIC METHODS OF ANALYSIS
... 3)Wavelength Selector - A device that isolates a restricted region of the EM spectrum used for measurement (monochromators, prisms, & filters). 4)Photoelectric Transducer - (Detector) Converts the radiant energy into a useable signal (usually electrical). 5)Signal Processor & Readout - Amplifies or ...
... 3)Wavelength Selector - A device that isolates a restricted region of the EM spectrum used for measurement (monochromators, prisms, & filters). 4)Photoelectric Transducer - (Detector) Converts the radiant energy into a useable signal (usually electrical). 5)Signal Processor & Readout - Amplifies or ...
Antenna
... • The gain of a Tx. Antenna is the square of the ratio of the field strength produced at a point in the direction of maximum radiation from the antenna to the field strength produced at the same point by the reference antenna. • It may also be expressed as the ratio of the powers required to be tran ...
... • The gain of a Tx. Antenna is the square of the ratio of the field strength produced at a point in the direction of maximum radiation from the antenna to the field strength produced at the same point by the reference antenna. • It may also be expressed as the ratio of the powers required to be tran ...
Antennas and Feeders
... • The combined energy is known as the forward and reflected power and gives rise to the Standing Waves on the feeder. ...
... • The combined energy is known as the forward and reflected power and gives rise to the Standing Waves on the feeder. ...
1 PHYS:1200 LECTURE 28 — ELECTRICITY AND MAGNETISM (6
... Maxwell realized then that changing electric and magnetic fields could reproduce each other, thus giving rise to an electromagnetic wave. An electromagnetic wave can be produced by causing the electrons in a conductor to oscillate rapidly as in the diagram on the right below. The osc ...
... Maxwell realized then that changing electric and magnetic fields could reproduce each other, thus giving rise to an electromagnetic wave. An electromagnetic wave can be produced by causing the electrons in a conductor to oscillate rapidly as in the diagram on the right below. The osc ...
IOSR Journal of Electronicsl and Communication Engineering (IOSR-JECE)
... depending on the shape and dimension of the defect .The disturbance at the shielded current distribution will influence the input impedance and the current flow of the antenna. It can also control the excitation and electromagnetic waves propagating through the substrate layer. The losses are due to ...
... depending on the shape and dimension of the defect .The disturbance at the shielded current distribution will influence the input impedance and the current flow of the antenna. It can also control the excitation and electromagnetic waves propagating through the substrate layer. The losses are due to ...
THE ISOTRON REVEALED - PART 2 By Dave Cuthbert
... ground wire and feedline shield currents were measured, using an MFJ-854 RF Current Meter, and the reduction in feedline shield current was confirmed. Ten beads would do a much better job. The ferrite beads were then placed over the feedline near the Isotron and there was very little reduction in fe ...
... ground wire and feedline shield currents were measured, using an MFJ-854 RF Current Meter, and the reduction in feedline shield current was confirmed. Ten beads would do a much better job. The ferrite beads were then placed over the feedline near the Isotron and there was very little reduction in fe ...
The `Tenna Dipper: A "Poor Man`s" Antenna Analyzer
... order to produce reliable, realistic results • The operator must use the antenna analyzer properly to obtain reliable, realistic results • Improper use of an antenna analyzer can damage it, resulting in an expensive repair bill (or the purchase of a new analyzer, ouch!) ...
... order to produce reliable, realistic results • The operator must use the antenna analyzer properly to obtain reliable, realistic results • Improper use of an antenna analyzer can damage it, resulting in an expensive repair bill (or the purchase of a new analyzer, ouch!) ...
The high voltage (HV) pulse radiation of a discone antenna
... minimal[3]. If the discone is electrically small , it can be fed to a reflector and also could be easily immersed in a medium which has high dielectric breakdown. D- Cone diameter ...
... minimal[3]. If the discone is electrically small , it can be fed to a reflector and also could be easily immersed in a medium which has high dielectric breakdown. D- Cone diameter ...
2 Use of Electromagnetic Energy and Resultant Noises
... permissible limits for disturbance generated by various types of equipment. However, these permissible limits cannot be simply compared with one another because measurement methods and conditions differ depending on the type of equipment. For example, ground-plane effects differ greatly depending on ...
... permissible limits for disturbance generated by various types of equipment. However, these permissible limits cannot be simply compared with one another because measurement methods and conditions differ depending on the type of equipment. For example, ground-plane effects differ greatly depending on ...
IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661,p-ISSN: 2278-8727 PP 06-11 www.iosrjournals.org
... electromagnetic wave at optical frequency. Optical antennas are similar to the RF antenna in receiving and transmission radiation in free space. The optical antenna captures free space electromagnetic wave and focused light energy into their high field region beyond their diffraction limit. The elec ...
... electromagnetic wave at optical frequency. Optical antennas are similar to the RF antenna in receiving and transmission radiation in free space. The optical antenna captures free space electromagnetic wave and focused light energy into their high field region beyond their diffraction limit. The elec ...
This chapter presents the conclusion drawn from the detailed
... The following are some of the prospects for future work: A review of the research discussed here indicates that reconfigurable antenna concepts and prototypes have been in development for more than 40 years. However, there are still very few reconfigurable antennas in use today. Although reconfigura ...
... The following are some of the prospects for future work: A review of the research discussed here indicates that reconfigurable antenna concepts and prototypes have been in development for more than 40 years. However, there are still very few reconfigurable antennas in use today. Although reconfigura ...
Key Materials and Components for Mobile
... capacity, along with the necessity to reduce power consumption of the electric circuit, it is necessary to implement RF (radio-frequency) circuits for trasmitting and receiving RF signals efficiently. Above all, the antenna—along with its directly connected filter and switch—is the key device domina ...
... capacity, along with the necessity to reduce power consumption of the electric circuit, it is necessary to implement RF (radio-frequency) circuits for trasmitting and receiving RF signals efficiently. Above all, the antenna—along with its directly connected filter and switch—is the key device domina ...
Finding Globally Optimum Solutions in Antenna Optimization Problems
... each other and satisfies the constraints of the problem. The following several paragraphs describe this technique in more detail. In order to capture the pattern at a specific angle (and with a known polarization), a receiving short dipole antenna is located at that angle in the far-field. A lumped ...
... each other and satisfies the constraints of the problem. The following several paragraphs describe this technique in more detail. In order to capture the pattern at a specific angle (and with a known polarization), a receiving short dipole antenna is located at that angle in the far-field. A lumped ...
Near and far field
The near field (or near-field) and far field (or far-field) are regions of the electromagnetic field around an object, such as a transmitting antenna, or the result of radiation scattering off an object. Non-radiative 'near-field' behaviors of electromagnetic fields dominate close to the antenna or scattering object, while electromagnetic radiation 'far-field' behaviors dominate at greater distances. Far-field E and B field strength decreases inversely with distance from the source, resulting in an inverse-square law for the radiated power intensity of electromagnetic radiation. By contrast, near-field E and B strength decrease more rapidly with distance (with inverse-distance squared or cubed), resulting in relative lack of near-field effects within a few wavelengths of the radiator.