Bandwidth Bandwidth is another fundamental antenna parameter. This describes the range of over which the antenna can properly radiate or receive energy. Often, the desired bandwidth is one of the determining parameters used to decide upon an antenna. For instance, many antenna types have very narrow bandwidths and cannot be used for wideband operation. Bandwidth is typically quoted in terms of . For instance, an antenna may be described as operating at 100-400 MHz with a VSWR<1.5. This statement implies that the reflection coefficient is less than 0.2 across the quoted frequency range. Hence, of the power delivered to the antenna, only 4% of the power is reflected back to the transmitter. Alternatively, the return loss =20*log10(0.2)=-13.98 dB. Note that the does not imply that 96% of the power delivered to the antenna is transmitted in the form of EM radiation; losses must still be taken into account. Also, the will vary with frequency. In general, the shape of the radiation pattern does not change radically.
Bandwidth Bandwidth is another fundamental antenna parameter. This describes the range of over which the antenna can properly radiate or receive energy. Often, the desired bandwidth is one of the determining parameters used to decide upon an antenna. For instance, many antenna types have very narrow bandwidths and cannot be used for wideband operation. Bandwidth is typically quoted in terms of . For instance, an antenna may be described as operating at 100-400 MHz with a VSWR<1.5. This statement implies that the reflection coefficient is less than 0.2 across the quoted frequency range. Hence, of the power delivered to the antenna, only 4% of the power is reflected back to the transmitter. Alternatively, the return loss =20*log10(0.2)=-13.98 dB. Note that the does not imply that 96% of the power delivered to the antenna is transmitted in the form of EM radiation; losses must still be taken into account. Also, the will vary with frequency. In general, the shape of the radiation pattern does not change radically.
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