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English: Far field vertical radiation pattern of 1.2 wavelength monopole antenna over a perfectly conducting infinite ground plane. The radial axis is relative signal strength (electric field magnitude) and the circumferential axis is in degrees.
The biconical antenna has a broad bandwidth because it is an example of a traveling wave structure; the analysis for a theoretical infinite antenna resembles that of a transmission line. For an infinite antenna, the characteristic impedance at the point of connection is a function of the cone angle only and is independent of the frequency.
The top shows the directive pattern of a horn antenna, the bottom shows the omnidirectional pattern of a simple vertical dipole antenna. In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other ...
English: Diagram showing why a monopole antenna has the same radiation pattern as a dipole antenna, with twice the radiated power.When a monopole antenna, (a) is mounted over a perfectly conducting ground plane such as the Earth, the radio waves can reach a given point P by two paths, either propagating directly in a straight line to P, or reaching P after first reflecting from the plane (blue ...
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The quarter-wave monopole (0.25λ, blue) has a pattern identical to the upper half of a dipole antenna pattern. The half-wave monopole (0.5λ, green) radiates more of the power in horizontal directions. The maximum horizontal radiation for a monopole antenna is achieved at a length of 0.625λ (red). At lengths above a half wavelength (0.5λ ...
This reduces stored energy in the electric field, reducing antenna Q while also reducing losses. The elevation pattern might be distorted with grating lobes. SWR (standing wave ratio) is typically 1.5:1 or less over several octaves of frequency. [4] A discone antenna consists of three main parts: the disc, the cone, and the insulator.
Vertical polarized VHF-UHF biconical antenna 170–1100 MHz with omnidirectional H-plane pattern. Omnidirectional radiation patterns are produced by the simplest practical antennas, monopole and dipole antennas, consisting of one or two straight rod conductors on a common axis. Antenna gain (G) is defined as antenna efficiency (e) multiplied by ...