The half-wave dipole is a “narrowband” antenna, meaning that its properties and behavior vary rapidly with frequency. This means that the characteristics discussed in the previous module are not generalizable across any significant bandwidth. In this module we will expand our discussion of the dipole antenna to include frequencies where its length is no longer equal to a half wavelength. Specifically, this module will consider how two major properties of the dipole – input impedance and radiation pattern – vary with respect to changes in the driving frequency.
Antennas are engineered devices used to send and receive electromagnetic signals. Each antenna has a unique set of characteristics — frequency response, polarization, radiation pattern, etc. It is important to know the general characteristics of common antenna topologies in order to be able to choose the proper topology for any particular application. In this course, we will briefly introduce four common antenna topologies: horn antennas, Yagi-Uda antennas, slot antennas, and rectangular patch antennas
Antennas are the front end for every wireless communication device. They have many characteristics like gain, bandwidth, directivity, efficiency, and more. Each of these characteristics are dependent on the application. One basic antenna type is the half-wave dipole antenna. It is simple to design and fabricate with an omnidirectional (rotationally symmetric) radiation pattern and linear polarization.
In this course the current structure and theoretical radiation pattern of the half wave dipole antenna is reviewed. The effect of fringing fields along with the current distribution is also discussed.
Antennas are the front end for every wireless communication device. They have many characteristics like gain, bandwidth, directivity, efficiency, and more. Each of these characteristics is dependent on the application. One of the most widely used techniques to enhance the antenna gain characteristic is array implementation. An antenna array can be analyzed theoretically in terms of its constituent element and array factor. The most efficient prediction of an array behavior can be achieved through simulation. This requires no prototyping or test setup, which reduces the overall design cycle time.
Ansys HFSS is an electromagnetic simulation tool based on the finite element method (FEM). In addition to design and analysis, this tool also provides many visual post-processing results for better understanding of the underlying physics.
This course demonstrates the procedure for setting up and analyzing a finite dipole array using the finite array domain decomposition method in Ansys HFSS.