Slot Dimensioning

  

Slot Antenna basics Impedance of Slot Antenna

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Dimension an existing curved slot Starting with a curved slot in a model document, create a drawing view that shows the curved slot by doing the following: Click the application button at the top-left of the window, and then choose Create Drawing. The problem with baseline dimensioning is obvious in Figure 4; its take up a lot of space on the drawing. Figure 4 Ordinate dimensioning. A common alternative to baseline dimensioning is ordinate dimensioning, also known as rectangular coordinate dimensioning without dimension lines. This scheme also relies on a baseline, referred to as zero (0. Standard metric T-slots and T-nuts Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! - search is the most efficient way to navigate the Engineering ToolBox! Dimensioning Slots. Dimensioning Consideration. Threads and threaded fasteners. Dimension line g 2.510 2.490 1 Dimension Limits of size Extension.

This page covers basics of slot antenna. It mentions features of slot antenna. The equation for impedance of slot antenna is also mentioned.

Definition: The antenna which is formed by constructing slot in metallic surface is known as slot antenna.This antenna will have opening either in conducting sheet of metal or in the walls of waveguide.This type of antenna is excited either by coaxial cable or by waveguide with suitable coupling.

Key features of slot antenna

The figure-1 depicts slot antenna of rectangular type.This slot antenna type will have slot of length equal to λ/2 and will have width much less than λ/2.As shown, the excitation is done from distance of 0.05λ from one end of slot using coaxial cable.

Dimensioning

Following are the key features of slot antenna:
• The slot can be circular, rectangular or of anyother shape and size.
• As slots are omni-directional, it will radiate from both sides.
• Array of slots are used to have higher gain and higher directivity.
• Electric field in the slot is like sinusoidal waveform.

Slot Antenna Impedance Equation

Following is the slot antenna impedance equation:
Zs = [ ηo2 / (4* Zd) ]
ηo = 120*π Ohm
Zd = Impedance of complementary dipole = Rd + j*Xd
Where, Rd = Real Part and Xd = Reactive Part

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Slot Dimension Callout

Dimensioning, ContinuedChamfersChamfers are bevels. External chamfers are bevels at the end of a dowel orshaft. Internal chamfers are bevels placed on the edges of a hole in anobject. Dimension chamfers by angle and a linear dimension or by twolinear dimensions. When specifying an angle and linear dimension, the lineardimension is the distance from the indicated surface of the part to the start ofthe chamfer.Use a note to specify 45° chamfers. Use this method only with 45° chamfersas the linear value applies in either the longitudinal (internal) or radial(external) direction.When depicting a chamfer of a round hole, follow the practice ofdimensioning as shown (figure 3-35, view C) except where the chamferdiameter requires dimensional control. Also, apply this type of control to thechamfer diameter on a shaft.Figure 3-35 illustrates dimensioning chamfers, 45° chamfers, and internalchamfers.Figure 3-35.—Dimensioning chamfers.3-39