Electronically steerable Yagi-Uda microstrip patch antenna array

TLDR: In this paper, the authors describe a four microstrip Yagi-Uda antenna array, which consists of four antennas arranged around a common reflector patch, having one antenna active at a time while the remaining three elements are earthed with pin diodes at their feed points.

Abstract: Summary form only given. The article describes a four microstrip Yagi-Uda antenna array. The array consists of four Yagi-Uda antennas arranged around a common reflector patch. This array is electronically steerable, having one antenna active at a time while the remaining three elements are earthed with pin diodes at their feed points. During tests the switching was done by manually swapping the feed and shorting stubs. The linear polarised radiation pattern from the array (single active antenna) at an elevation of 26 degrees above the planar array is presented.

Full text

Electronically Steerable Yagi-Uda Microstrip Patch Antenna
Array
Author
Gray, D, Lu, JW, Thiel, DV
Published
1995
Conference Title
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
DOI
https://doi.org/10.1109/APS.1995.530952
Copyright Statement
© 1995 IEEE. Personal use of this material is permitted. However, permission to reprint/
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Downloaded from
http://hdl.handle.net/10072/19842
Griffith Research Online
https://research-repository.griffith.edu.au

ELECTRONICALLY
STEERABLE
Y AGI-UDA MICROSTRIP PATCH
ANTENNA ARRAY
Derek Gray,
Jun
Wei Lu and David
V.
Thiel*
School of Microelectronic Engineering, Faculty of Science
&
Technology,
Griffith University, Nathan, Qld 41
11,
AUSTRALIA
This presentation describes
a
four microstrip Yagi-Uda antenna array. The
single microstrip Yagi-Uda antenna was developed by J. Huang at Jet Propulsion
Laboratory,
and had
a
maxirnurn gain of 8dBic (J. Huang; “Planar Microstrip
Yagi Array Antenna”,
IEEE
AP-S Symposium Digest June 1989,
pp 894-897).
A single Yagi-Uda antenna consists of
a
single driven patch,
a
larger reflector
patch and two smaller director patches. This mangernent shows many advantages
over
a
single microstrip patch antenna, which include
a
slightly increased forward
gain and an increased directivity.
The
bandwidth is
also
increased significantly
from that of
a
single patch, due to the effects of the parasitic patches.
The amy consists of four
Yagi-Uda
antennas arranged around
a
common
reflector patch (Figure
1).
This
array
is
electronically steerable,
having
one
antenna active
at
a
time while the remaining three elements
are
earthed
with
pin
diodes
at
their feed points. During tests the switching was done by manually
swapping the feed and shorting stubs. The linear polarised radiation pattern from
the array (single active antenna)
at
an elevation of
26
degrees above the planar
array
is
presented in Figure
2.
By switching between the four Yagi-Uda antennas
in the array,
360
degree coverage within 1OdB
is
possible. This L-band anlenaa
array (fabricated on 4.8” thick FR-4 epoxylfibre-glass PCB substrate) is suitable
as
a
low profile, low cost land mobile communications antenna.
LOGARNM
square
2.7”
gap
antenna
radius=198mm
Figure
1
Figure
2
0-7&33-’2719-5/9554.M)0
1595
IEEE
1870