Multi-beam Patch Antenna Design Mustafa Konca Supervisor: Prof. Dr. Sener Uysal

Multi-beam Patch Antenna
Mustafa Konca
Supervisor: Prof. Dr. Sener Uysal
Project Statement
Design of a multi-beam patch antenna
To be used in a security system
Software simulations
Field tests
Lab tests
The Security System
Patch Antenna
RF Link
Solar Panel
The Security System
• Autonomous Modules
– Solar panels
– Batteries
– Intelligent software
• Reliable Design
• Flexibility
• Fast Communication
– Requires a well designed antenna
The Module
• Hexagonal pyramid design
– Self Cleaning
– Sturdy
– Moving Sides
Why Multi-Beam?
The Pyramid will be stationary
Minimum number of moving parts required
Antenna needs to transmit in different directions
Antenna should cover a whole hemisphere
This can be achieved with an antenna that has 5
beams in different directions at 45 degrees to
each other
• The antenna direction can be finely adjusted by
moving the sides of the pyramid
Why Patch?
• Low profile
– Resists wind and wear
• Flexibility
– Conformal shapes possible
• Lightweight
• Inexpensive
• Ease of manufacture
Why Multiband?
• Reliability
– Interference
– Diversity
• Environmental conditions
• Speed
Specification Objectives
• Single design for all modules and locations
• Dual band (ISM)
– 2.4–2.5 GHz
– 5.725–5.875 GHz
• Five beams to cover a whole hemisphere
– Selectable beams
– Simultaneous if possible
• Narrow beam-width for longer range
• High Gain
• Wide bandwidth for fast communication
Design Approach
• Option 1: A multilayer approach with many
beams and a technique for suppressing the
• Option 2: Five antennas integrated as one
• Both approaches are very challenging; such an
antenna does not exist
Design Steps
• Use an existing element design
• Design 5 separate antennas
• Try to combine the antennas
– Phased array
• Design micro-strips to get necessary phase shift
– Multilayer
• Several antennas on top of each other
• Switching to control the beam direction
• Design a better element if time permits
• Investigate the possibility of having more than
one beam operational at the same time
• First step will be simulating the single element
which has high gain and directivity
• Then the single element will be used in different
configurations to get beams in 5 directions
• Design Parameters:
Distance to the ground plane
Feed type
Placement on the module
Building the Antenna
• Cost?
• Hand made or fabricated?
– Hand made design may not give accurate results
– Multilayer design has to be fabricated
• Need two for field tests
• Connectors
• Source and receiver
Practical Tests and Tuning
• Field tests
– Confirm simulation results
• Gain
• Efficiency
• Bandwidth etc.
– Test under different conditions
Harsh weather
Landscape and obstacles
Different distances
Signal integrity
Interference from other devices
– Tune and redesign if necessary and repeat all tests
End of Presentation….
• Thank you for you time!