自第二次世界大战以来，雷达系统工程师使用频带字母名称作为描述工作频带的简短符号。多年来，这种用法一直在使用，现在已成为雷达工程师公认的做法。使用雷达频率字母名称的原因如下: -它们提供了一种方便的方法来描述雷达工作的频带，而不需要笨拙地用数字表示频率限制。例如，说a更方便？L波段雷达？而不是a？1215兆赫- 1400 MHz雷达。一这在有关雷达的已发表论文的标题、雷达系统和组件的广告中，或在需要简短符号的任何其他情况下都特别重要。 -在军用雷达系统中，通常无法透露准确的工作频率，但在许多情况下，可以描述其工作的频带。字母名称允许这种情况。 -每个雷达频带都有其特定的特性。因此，X波段雷达将不同于S波段雷达。字母名称通常以这种方式使用，以指示雷达的特定性质，因为它受其频率的影响。 区分不同波段雷达的特性、应用和环境约束存在巨大差异。与L波段雷达、C波段雷达和其他雷达不同的是，需要简洁地传达S波段雷达共享的整套特征，这需要使用字母名称。

Since World War II, radar systems engineers have used band letter designations as a short notation for describing the frequency band of operation. This usage has continued throughout the years and is now an accepted practice of radar engineers. Radar-frequency letter designations are used for the following reasons: - They provide a convenient method for describing the band in which the radar operates without the need for awkwardly stating the frequency limits in numerical terms. For example, it is more convenient to say an "L-band radar" than a "1215 MHz-1400 MHz radar." This is especially important in titles of published papers on radar, in advertising of radar systems and components, or in any other situation where a short notation is desired. - In military radar systems, the exact frequency of operation cannot usually be disclosed, but it is permissible in many cases to describe the band in which it operates. The letter designations permit this. - Each radar-frequency band has its own particular characteristics. Thus, an X-band radar will be different from an S-band radar. The letter designations are often used in this manner to indicate the particular nature of the radar, as it is influenced by its frequency. There are vast differences in characteristics, applications, and environmental constraints that distinguish radars in the different bands. It is the need to communicate concisely the whole set of characteristics that are shared by S-band radar, as distinguished from L-band radar, C-band radar, and the others, which requires the established usage of letter designations.