条形变幅杆
端部没有贯穿槽的矩形变幅杆（即变幅杆要么无槽，要么仅沿厚度方向开槽）。如果变幅杆开槽，则宽度尺寸（变幅杆的侧面）通常远大于厚度尺寸（变幅杆的端部）。条形变幅杆常通过使前端厚度小于背部厚度来设计增益。
条形变幅杆的尺寸按以下顺序给出：
示例：一支 75 mm x 15 mm x 40 mm 的条形变幅杆，其端面宽度为 75 mm，端面厚度为 15 mm，背部厚度为 40 mm。
Bar horn
A rectangular horn without any slots through the ends (i.e., the horn is either unslotted or only slotted through the thickness). If the horn is slotted then the width dimension (the side of the horn) is usually substantially greater than the thickness dimension (the end of the horn). Bar horns are often designed for gain by making the front thickness smaller than the back thickness.
The dimensions of a bar horn are specified in the following order:
Face width x Face thickness x Back thickness
Example: a 75 mm x 15 mm x 40 mm bar horn has a face width of 75 mm, a face thickness of 15 mm and a back thickness of 40 mm.