Contents
What is antenna gain efficiency?
Antenna Gain is the ratio of power transmitted in a certain direction with a specific reference point. Relation between gain and efficiency is G = e x D where D is the directivity and E if the efficiency Antenna efficiency is how much RF power delivered to the antenna (from radio) is actually transmitted into the air.
What is the relationship between antenna gain and antenna effective area?
For a given frequency, the antenna’s effective area is proportional to the power gain. An antenna’s effective length is proportional to the square root of the antenna’s gain for a particular frequency and radiation resistance.
What are the different ways to increase radiation efficiency?
You can apply reflecting surfaces, active component, EBG structure or slot matching etc to improve radiation efficiency.
Can you use a 4nec2 I antenna system?
With 4NEC2 I model because I can. This simple antenna system is a great sandbox for learning the tricks of the NEC codes and some of the basic principles of antenna design, and to find all the pitfalls of this nice idea. My NEC description for this vertical antenna model is located here, to use with 4NEC2 available here.
Is there an antenna optimizer for NEC2 or NEC4?
4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.
How does 4nec2 help get the correct dimensions?
4NEC2 can help get the correct dimensions with the “Optimizer” that is built in. Any variables that you define, and to which you assign a value, can be used as a variable to optimize. In this case we want the optimizer to tune the wire lengths to give us low SWR. The model is set up with the 3/4 wave long 75Ω transmission line.
Is there a 3D geometry editor for 4nec2?
For the starting modeler a graphically based 3D geometry-editor is included which requires no additional NEC knowledge while still enabling you to create and visualize and compare current-distribution, far/near-field patterns and Gain/SWR charts.