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Because the beam is slightly concentrated, dipole antennas have a gain over isotropic antennas of 2.14 dB in the horizontal plane. The dipole radiation pattern is 360 degrees in the horizontal plane and approximately 75 degrees in the vertical plane (this assumes the dipole antenna is standing vertically) and resembles a donut in shape.

Unlike isotropic antennas, dipole antennas are real antennas. Figure 2: Radiation Pattern of an Isotropic AntennaДЄntennas can be broadly classified as omnidirectional and directional antennas, which depends on the directionality. It is used to compare the power level of a given antenna to the theoretical isotropic antenna. It is an ideal antenna which radiates in all directions and has a gain of 1 (0 dB), i.e. In other words, a theoretical isotropic antenna has a perfect 360 degree vertical and horizontal beamwidth or a spherical radiation pattern. An isotropic antenna is a theoretical antenna with a uniform three-dimensional radiation pattern (similar to a light bulb with no reflector).

Figure 1: Beamwidth of AntennaДЄntennas are rated in comparison to isotropic or dipole antennas. Therefore, for an antenna you have horizontal beamwidth and vertical beamwidth. Beamwidth is the angular separation between the half power points (3dB points) in the radiation pattern of the antenna in any plane. The redirection of this energy has the effect of providing more energy in one direction, and less energy in all other directions.Д«eamwidths are defined in both horizontal and vertical plains. Instead, an antenna simply redirects the energy it receives from the transmitter. These angles are measured in degrees and are called beamwidths.ДЄn antenna is a passive device which does not offer any added power to the signal. The coverage area or radiation pattern is measured in degrees. This provides a greater coverage distance, but with a reduced coverage angle. As the gain of a directional antenna increases, the angle of radiation usually decreases. Direction is the shape of the transmission pattern. Gain is the amount of increase in energy that an antenna adds to a radio frequency (RF) signal. Basic Definitions and Antenna ConceptsДЄn antenna gives the wireless system three fundamental properties: gain, direction and polarization. Refer to Cisco Technical Tips Conventions for more information on document conventions.

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This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. Dapat mengubah wifi USB adaptor anda tersebut menjadi sebuah antenna wifi USB eksternal dengan sedikit kreatifitas.Antena Wifi USB atau biasa disebut dengan Uni-Directional Wifi. Omni WiFi antennas are used in most public and point to multipoint wireless / wifi. Omni Directional antennas cover a 360 degree radiation pattern, with various degrees of vertical signal coverage.

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RadioLabs offers a full range of omni directional wifi antennas for all frequencies, 2.4, 5.8 and 900mhz. Proses pembuatan antena Omni Directional.

Dapat mengubah wifi USB adaptor anda tersebut menjadi sebuah antenna wifi USB eksternal dengan sedikit kreatifitas.Antena Wifi USB. Jual: Antena omni wifi 2.4Ghz jangkauan 1.5 km di akses langsung laptop В« on: March 24, 2010, 12:33:52 AM В» Kami menjual antena wifi omni.

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Imagine a future in which your every belonging is marked with a unique number identifiable with the swipe of a scanner, where the location of your car is always pinpoint-able and where signal-emitting microchips storing personal information are implanted beneath your skin or embedded in your inner organs. This document gives basic antenna definitions and discusses antenna concepts with a focus on the pros and cons of omni and directional antennas.Д«uat Sendiri Antena Omni Wifi Spesifikasi Antena OmniDirectional Antena ini mempunyai sudut pancaran yang besar (wide beamwidth) yaitu 3600 dengan daya lebih meluas, jarak yang lebih pendek tetapi dapat melayani area yang luas Omni antena tidak dianjurkan pemakaian-nya, karena sifatnya yang terlalu luas se-hingga ada kemungkinan mengumpulkan sinyal lain yang akan menyebabkan inter-ferensi.