.net barcode reader component download Vee beams and rhombic beams in Software

Generation Data Matrix 2d barcode in Software Vee beams and rhombic beams

Vee beams and rhombic beams
Reading ECC200 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Draw Data Matrix 2d Barcode In None
Using Barcode encoder for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Longwire antennas can be combined in several ways to increase gain and sharpen directivity Two of the most popular of these are the vee beam and the rhombic antennas Both forms can be made in either resonant (unterminated) or nonresonant (terminated) versions Vee beams The vee beam (Fig 9-9A) consists of two equal-length longwire elements (wire 1 and wire 2), fed 180 out of phase with each other, and spaced to produce an acute angle between them The 180 phase difference is inherent in connecting the two wires of the vee to opposite conductors of the same parallel conductor feedline
ECC200 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Create Data Matrix ECC200 In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
222 Longwire directional antennas
Encoding Data Matrix ECC200 In .NET
Using Barcode creation for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
Data Matrix 2d Barcode Encoder In .NET
Using Barcode maker for VS .NET Control to generate, create DataMatrix image in VS .NET applications.
Resultant pattern Direction of maximum reception
Create Data Matrix ECC200 In VB.NET
Using Barcode printer for VS .NET Control to generate, create DataMatrix image in .NET applications.
Code 128B Printer In None
Using Barcode drawer for Software Control to generate, create Code 128 Code Set B image in Software applications.
9-9A Radiation pattern of vee beam antenna consists of the algebraic sum of the two longwire patterns that make up the antenna
Encoding GTIN - 13 In None
Using Barcode printer for Software Control to generate, create GS1 - 13 image in Software applications.
Draw Bar Code In None
Using Barcode creation for Software Control to generate, create bar code image in Software applications.
The unterminated vee beam (Fig 9-9A) has a bidirectional pattern that is created by summing together the patterns of the two individual wires Proper alignment of the main lobes of the two wires requires an included angle, between the wires, of twice the radiation angle of each wire If the radiation angle of the wire is , then the appropriate included angle is 2 To raise the pattern a few degrees, the 2 angle should be slightly less than these values It is common practice to design a vee beam for a low frequency (eg, 75-/80- or 40-m bands), and then to use it also on higher frequencies that are harmonics of the minimum design frequency A typical vee beam works well over a very wide frequency range only if the included angle is adjusted to a reasonable compromise It is common practice to use an included angle that is between 35 and 90 , depending on how many harmonic bands are required Vee beam patterns are based on an antenna height that is greater than a halfwavelength from the ground At low frequencies, such heights will not be practical, and you must expect a certain distortion of the pattern because of ground reflection effects Gain on a vee beam antenna is about 3 dB higher than the gain of the single-wire longwire antenna of the same size, and it is considerably higher than the gain of a
Make UCC.EAN - 128 In None
Using Barcode generation for Software Control to generate, create GTIN - 128 image in Software applications.
Painting ANSI/AIM Code 39 In None
Using Barcode drawer for Software Control to generate, create Code 3/9 image in Software applications.
Nonresonant single-wire longwire antennas 223 dipole (see Fig 9-9B) At three wavelengths, for example, the gain is 7 dB over a dipole In addition, there may be some extra gain because of mutual impedance effects which can be about 1 dB at 5 and 2 dB at 8 Nonresonant vee beams Like the single-wire longwire antennas, the vee beam can be made nonresonant by terminating each wire in a resistance that is equal to the antenna s characteristic impedance (Fig 9-10) Although the regular vee is a standing wave antenna, the terminated version is a traveling wave antenna and is thus unidirectional Traveling wave antennas achieve unidirectionality because the terminating resistor absorbs the incident wave after it has propagated to the end of the wire In a standing-wave antenna, that energy is reflected backwards toward the source, so it can radiate oppositely from the incident wave Rhombic beams The rhombic beam antenna, also called the double vee, consists of two vee beams positioned end-to-end with the tips connected The unidirectional, nonresonant (terminated) rhombic is shown in Fig 9-11 The unterminated resonant form gives approximately the same gain and directivity as a vee beam of the same size The nonresonant rhombic has a gain of about 3 dB over a vee beam of the same size (see Fig 9-9 again) Two angles are present on the rhombic antenna One-half of the included angle of the two legs of one wire is the tilt angle ( ), while the angle between the two wires is the apex angle ( ) A common rhombic design uses a tilt angle of 70 , a length of 6 for each leg (two legs per side), and a height above the ground of 11
Creating ITF14 In None
Using Barcode drawer for Software Control to generate, create EAN - 14 image in Software applications.
Barcode Creation In .NET
Using Barcode creation for VS .NET Control to generate, create bar code image in VS .NET applications.
Creating EAN13 In .NET Framework
Using Barcode printer for Reporting Service Control to generate, create EAN-13 image in Reporting Service applications.
EAN / UCC - 14 Drawer In Visual C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create EAN128 image in .NET applications.
Encoding UCC.EAN - 128 In Objective-C
Using Barcode generation for iPhone Control to generate, create UCC-128 image in iPhone applications.
Code 128 Creator In None
Using Barcode creator for Word Control to generate, create Code 128 Code Set C image in Office Word applications.
Print USS Code 39 In None
Using Barcode creation for Office Excel Control to generate, create Code 39 image in Office Excel applications.
Bar Code Recognizer In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Copyright © OnBarcode.com . All rights reserved.