antenna efficiency वाक्य
उदाहरण वाक्य
मोबाइल
- Antenna efficiency is different from and contrasted with radiation efficiency, which applies to any antenna type.
- As a broadband antenna, the T2FD will normally display a reasonably low SWR does not mean high antenna efficiency.
- Antenna efficiency, ?, is a term associated with aperture antennas, e . g ., parabolic dishes.
- The resistor network exception was created to allow stations to reduce their antenna efficiency without having to modify the existing tower.
- Note that antenna efficiency is a separate issue from impedance matching, which may also reduce the amount of power radiated using a given transmitter.
- Series-fed monopole antenna sites require care, keeping weeds as short as possible, since weeds will dissipate radio frequency power, severely reducing antenna efficiency.
- Thus, the effective area of an aperture antenna is the surface area of a theoretically perfect aperture that would collect the same energy as the actual aperture with associated antenna efficiency.
- Contrast this tiny component to the massive and very tall towers used at AM broadcast stations for transmitting at the very same frequency, where every percentage point of reduced antenna efficiency entails a substantial cost.
- "' Partial directivity "'is calculated in the same manner as the partial directive gain, but without consideration of antenna efficiency ( i . e . assuming a lossless antenna ).
- However, in the case of a directional antenna used for receiving signals with the intention of " rejecting " interference from different directions, one is no longer concerned with the antenna efficiency, as discussed above.
- Antenna efficiency is defined as the ratio of the aperture effective area, A e to its actual physical area, A . It describes the percentage of the physical aperture area which actually captures radio frequency ( RF ) energy.
- A station whose maximum coverage would otherwise be available at 4500 watts ( given a specific directional pattern and antenna system efficiency ) had a choice of either living with 2500 watts, or reducing the antenna efficiency to a level which would allow for 5 kW . Newly-constructed stations could fairly easily design an antenna system to meet the requirements, but stations on or moving to a shared tower with higher efficiency had a problem.
- Antenna gain \ scriptstyle G, which is equal to the antenna's directivity multiplied by the antenna efficiency, is defined as the ratio of the intensity \ scriptstyle I ( power per unit area ) of the radio power received at a given distance from the antenna ( in the direction of maximum radiation ) to the intensity \ scriptstyle I _ \ text { iso } received from an isotropic antenna at the same distance.
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