Electronics
& Communication Technologies
- Flat Antenna to Transmit and to Receive the Circularly
Polarised Signals
Introduction
Antenna is an integral part of wireless, cellular, satellite
and vehicular communication system and used for transmitting
and receiving signals. An antenna, which transmits circularly
polarized signals can overcome the problem of polarization
rotation and reduce the multipath effects. This could
be achieved generally by the use of printed antennas
or flat antennas. The printed antennas, though cost
effective and lightweight, have major disadvantages
like difficulty in construction and complicated to manufacture.
Some of the other known antenna systems used to transmit
and receive circularly polarized signals, split the
input signals to two equal parts having a phase difference
of 900 which are fed to a single or a pair of radiating
elements to achieve circular polarization thus making
the system more complex. These drawback have been overcome
in the present development which can also transmit and
receive circularly polarized signals at microwave and
millimeter wave frequencies.
In the present embodiment, the antennae
consists of a thin, flat, rectangular, dielectric substrate.
On one face of the substrate a conducting pattern is
printed photo-lithographically. The pattern comprises
parallel, thin, closely place strips, the strips make
an angle a with respect to the y-direction. The input
signal is fed through a coaxial connector. The antennae
radiates two beams symmetrically inclined to the y-z
plane. The radiated beams are circularly polarized.
The antennae are also used for receiving circularly
polarized signals when properly oriented with respect
to the direction of arrival of the signal.
Salient features:
Easy to manufacture and lightweight; Economical construction
and easy transportation; Transmit and receive signals
at various frequencies without any change in main configuration;
Input signals are inherently suitable for circularly
polarized signals; Has potential of relatively wider
bandwidth; Improved operational characteristics.
Prospective Users: All
communication system such as wireless, satellite, mobile,
etc.
Type of Technology: Device
fabrication
Status of IPR Protection:
Indian Patent Application No 1202/DEL/1997 dated 8th
May 1997 entitled "Flat Antenna to transmit and
to receive the circularly polarized Signals"
Developed by :
Dr. Aditya Sheel Department: Electrical
Engineering
Contact:
Managing Director
Foundation for Innovation and Technology Transfer (FITT)
Indian Institute of Technology, Delhi
Hauz Khas, New Delhi-110016, INDIA
Tel : 91-011-26597167, 26857762, 26581013, 26597153
Fax : 91-011-26851169
E-mail : drkdpn@gmail.com
