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1. Design of Cross Dipole Antenna For The GPS Band
NISHIT S. NATHWANI1
, DARSHAN H. TRIVEDI2
ELECTRONICS AND COMMUNICATION DEPARTMENTS (B.E 4th YEAR)
1Vyavasayi Vidya Pratishthan engineering college360005-, Gujarat, India
2 Vyavasayi Vidya Pratishthan engineering college-360005, Gujarat, India
*Contact:nishitnathwani97@gmail.com, phone +91-7046430915, +91-7405888469
Abstract-A turnstile antenna, or crossed-dipole
antenna,[1]
is a radio antenna consisting of a set of two
identical dipole antennas mounted at right angles to each
other and fed in phase quadrature. The dipole antenna is an
antenna made of copper wire to resonate at the expected
working frequency. In this research, the design of cross
Dipole antenna was at the frequency of 2 GHz for GPS
Application and our designed cross dipole antenna resonate
at 2 GHz and yield around 500 MHz bandwidth with
VSWR<= 3db and return loss<= -10db.
Keywords: cross dipole, GPS Band antenna,
circular polarised antenna
I. INTRODUCTION
The crossed-dipole antenna consists of two
identical but orthogonal short-dipole antennas that
are phased 90° apart. The name reflects the notion
the antenna looks like a turnstile when mounted
horizontally. The antenna can be used in two possible
modes. In normal mode the antenna
radiates horizontally polarized radio waves
perpendicular to its axis. In axial mode the antenna
radiates circularly polarized radiation along its axis.
Specialized normal mode turnstile antennas
called super turnstile or batwing antennas are used
as television broadcasting antennas. Axial mode
turnstiles are widely used for satellite ground station
antennas in the VHF and UHF bands, as circular
polarization is often used for satellite communication
since it is not sensitive to the orientation of the satellite
antenna in space.in our design cross dipole antenna
resonate at 2 GHZ with providing 500 MHZ bandwidth.
The turnstile antenna was invented by George Brown in
1935 and described in scholarship in 1936([2]). The patent
history reveals the popularity of the turnstile antenna over
the years([2]).
II. DESIGN AND SPECIFICATION
The dimensions of the proposed antenna which given as
below.
Sr. no Parameter Value
(1) Resonating
frequency 2 GHZ
(2) Length of driven
element
35(mm)
(3) Total length of the
antenna
71(mm)
(4) Gap between two
dipole elements
1(mm)
For the designing of the antenna we used HFSS (High
frequency structure simulator) software as shown in below and
also shown results graphs obtained from the simulator.
II. DESIGN OF THE CROSS DIPOLE ANTENNA

2. In shown fig. shown the structures of the two identical dipole
with right angle to each other and excited with Lumped Port.
Here are one antenna driven length is 35mm with 1mm
Radius of cylinder.
Here we are provide lumped port to both of the dipole as
shown in above figure.
Here I will given individual lumped port to separate dipole
Antenna.
III. ANTENNA CHARACTERISTICS CONFIGURATION
Now for the knowing our antenna characteristics and
behaviour at the range of frequency doing setup for the solution
as shown in below figure.
As here I show that select Discrete Sweep type and select the
frequency range from 1 to 20 GHz. After setup this now I
have given my simulation data figures which obtained from
HFSS software.
IV.SIMULATION DATA AND FIGURES
A. Figures and Tables
As below shown the results of the antenna that first is the
return loss graph see the graph as it suggest that we have getting
return loss <= -10 db from 1.7 GHz to 2.3 GHz and VSWR <=
5 db from given frequency range. so it will provide around 500
MHz bandwidth.

3. As this shown graph our antenna can be able circular
polarisation receiving capability for the GPS Band frequency
because as see the figure it will tell us the gain of the antenna is
equal at the angle Phi= 0 degree and Theta = 90 degree.
V. REFERENCES
[1] Antenna Theory: Analysis and Design, 3rd Edition
by Constantine A. Balanis
[2] https://en.wikipedia.org/wiki/Turnstile_antenna
[3] https://etda.libraries.psu.edu/catalog/b2773v68h
[4] Wibisono, Gunawan et al., “Multiband Bandpass Filter
(BPF) based on Folded Dual Crossed Open Stubs”. International
Journal of Technology, v. 5, n. 1, p. 32-39, jan. 2014. ISSN 2087-
2100.
[5] Firmansyah, T., Praptodiyono, S., Pramudyo, A.S. C.
Chairunissa, M. Alaydrus. (2017). Hepta-band bandpass
filter based on folded cross-loaded stepped impedance
resonator. Electronics Letters, 53 (16), 1119–1121. doi:
10.1049/el.2017.1121