01-12-2012, 05:29 PM
DESIGN OF TOOTHED LOG PERIODIC ANTENNA
[attachment=42148]
INTRODUCTION
Log periodic antenna is the extended versions of most familiar Yagi Uda antennas.
log-periodic antenna (LP, also known as a log-periodic array or log periodic beam antenna/aerial) is a broadband, multi-element, directional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. That is why it is known as log-periodic.
Types of LP antenna
The main types of log periodic array include:
Zig zag log periodic array
Trapezoidal /toothed log periodic
Slot log periodic
V log periodic
Log periodic dipole array
Here we are going to explain the design and result pattern of log periodic toohed antenna.
Structure of LP antenna
The most common is the log periodic dipole array basically consists of a number of dipole elements. These diminish in size from the back towards the front.
The element at the back of the array where the elements are the largest is a half wavelength at the lowest frequency of operation.
About software
The software we used in the designing of LP Toothed antenna is HFSS.
HFSS software is used for designing and simulation of different type of antennas and wave guide structures (TEE junction, cavity etc.)
Advantage
log periodic antenna is able to provide directivity and gain while being able to operate over a wide b/w.
It is nearly frequency independent.
This type of RF antenna design is directional.
It is normally capable of operating over a frequency range of about 2:1.
[attachment=42148]
INTRODUCTION
Log periodic antenna is the extended versions of most familiar Yagi Uda antennas.
log-periodic antenna (LP, also known as a log-periodic array or log periodic beam antenna/aerial) is a broadband, multi-element, directional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. That is why it is known as log-periodic.
Types of LP antenna
The main types of log periodic array include:
Zig zag log periodic array
Trapezoidal /toothed log periodic
Slot log periodic
V log periodic
Log periodic dipole array
Here we are going to explain the design and result pattern of log periodic toohed antenna.
Structure of LP antenna
The most common is the log periodic dipole array basically consists of a number of dipole elements. These diminish in size from the back towards the front.
The element at the back of the array where the elements are the largest is a half wavelength at the lowest frequency of operation.
About software
The software we used in the designing of LP Toothed antenna is HFSS.
HFSS software is used for designing and simulation of different type of antennas and wave guide structures (TEE junction, cavity etc.)
Advantage
log periodic antenna is able to provide directivity and gain while being able to operate over a wide b/w.
It is nearly frequency independent.
This type of RF antenna design is directional.
It is normally capable of operating over a frequency range of about 2:1.