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亚GHz无线部署的主要优先事项
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亚GHz无线部署的主要优先事项
建立一个先进的无线系统，大多数开发者会选择两工业，科学和医疗（ISM）频段的options-2.4 GHz或子千兆赫的频率。将一个或另一个与系统的最高优先级配对，将提供无线性能和经济性的最佳结合。这些优先事项可以包括：范围、功耗、数据速率、天线尺寸、互操作性（标准）和全球部署。然而，对于低数据速率应用，如家庭安全/自动化和智能计量，亚千兆赫无线系统提供了几个优点，包括更长的范围、降低的功耗和较低的部署和运营成本。
的sub-GHz无线电
亚千兆赫无线电可以提供相对简单的无线解决方案，可以不间断地使用电池供电，长达20年。显著的优势超过2.4 GHz的无线电包括：
Range -- The narrowband operation of a sub-GHz radio enables transmission ranges of a kilometer or more. This allows sub-GHz nodes to communicate directly with a distant hub without hopping from node to node， as is often required using a much shorter-range 2.4 GHz solution. There are three primary reasons for sub-GHz superior range performance over 2.4 GHz applications：
As radio waves pass through walls and other obstacles， the signal weakens. Attenuation rates increase at higher frequencies， therefore the 2.4 GHz signal weakens faster than a sub-GHz signal.
2.4 GHz radio waves also fade more quickly than sub-GHz waves as they reflect off dense surfaces. In highly congested environments， the 2.4 GHz transmission can weaken rapidly， which adversely affects signal quality.
Even though radio waves travel in a straight line， they do bend when they hit a solid edge （like the corner of a building）。 As frequencies decrease， the angle of diffraction increases， allowing sub-GHz signals to bend farther around an obstacle， reducing the blocking effect.
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