Different ShapedPatch Array Antenna with Liquid Crystal Substrate (LCS)

International
OPEN ACCESS Journal
Of Modern Engineering Research (IJMER)
| IJMER | ISSN: 2249–6645 | www.ijmer.com | Vol. 7 | Iss. 3 | Mar. 2017 | 76 |
Different ShapedPatch Array Antenna with Liquid Crystal
Substrate (LCS)
1
Mamdoh Barnawi, 2
Adnan Affandi, 3
Abdullah M. Dobaie
1,2,3
Electrical And Computer Engineering Department King Abdul Aziz University
I. INTRODUCTION
Micro strip patch antenna consists of a radiating patch on one side of a dielectric substrate, which has a
ground plane on the other side. A Micro strip patch antenna is a narrowband, wide-beam antenna fabricated by
etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate with a continuous
metal layer bonded to the opposite side of the substrate which forms a ground plane.
PatchAntenna Model.
Fig (1) to (2) show the proposed patch antenna on the liquid crystal more detail on these antennas will be
discussed in section (3).
Fig (1)Irregular crystal shapedpatch module
(2) Rectangular shapedcrystal patch module
ABSTRACT: This paper is mainly dealing with three different types of patch antennas which are list
in fig(1), fig (2) and fig (3) respectively. These proposed antennas are design on liquid crystal substrate
liquid crystal substrate. Enhancement factor to improve these proposed antenna performances are
introduced. The selected operated frequencies is covering the rang between (1-45) GHz. The objective
of these proposed antenna designs are to provide antenna dual band width as well as high gain. All the
designs will be implemented on liquid crystal substrate of dielectric constant εr=2.2 and thickness of
0.175 mm. These antennas are narrow and dual band. The gain this work is satisfied our results.

Deferent Shape Patch Array Antenna With Liquid Crystal Substrate (LCS)
Fig (3) Triangle shaped crystal patch module
1. Antenna Design Constrictions
Figure (1) and (3) show the irregular shaped patch antenna array which made of small Rectangular,
Disc andTriangular shape aredesigned on liquid crystal substrate shown in.The dielectric constant (Єr) is 3
while the loss tangent (δ) is 0.003.the resonant length L‟ of the proposed patch 2 andthewidth (W) should be
larger than L so that large bandwidth can be obtained. Here we have taken width (W) as 1.5 times of length (L).
Height of the dielectric substrate should be in between 0.003 λ0 and 0.05λ0. We have taken 0.02 times of λ0. As
50Ω feed is used normally, feed point is taken where 50Ω resistance occurs. Substrate shown in figure (4).

Fig 8 radiation pattern of fig 2
Fig 7the return loss of fig 2

Fig 10 radiation pattern of fig 3
3.1 Design Arrhythmic Patch Array Antenna in liquid Crystal Substrate:
Figure 1 represents the scattered array patch array antenna of different shapes on arrhythmic shaped of
liquid crystal substrate with operating frequency of 15 GHz. It is clear from the figure 5 the return loss of this
proposed patch array antenna. It obvious from this frequency response one can see that a dual frequency of the
operation can be observed at 15 GHz and 32.5 GHz respectively. Also dual bandwidth of 0.7 GHz at 15 GHz
and 1.5 GHz at 32.5 GHz respectively are obtained.Figure 6 shows the 3-D radiation pattern of the proposed
patch array antenna of different shapes and size on the arrhythmic liquid crystal. It is obvious that this generated
3D radiation shows a linear polarization radiation pattern.
33.2 Design Circular Polarized Patch Array antenna on liquid Crystal Substrate with Enhancement
Factors:
Figure 2 represent the layout of patch array antenna on circular liquid crystal substrate. This liquid
crystal has 0.003 tangents. Enhancement factors. Design frequency was selected at 13.85 GHz.
Figure 7 shows the return loss of this proposed patch array antenna. It is obvious from this frequency response
that a dual operation is generated at both 12.2 GHz with bandwidth of 2.8 and at 17.1 GHz with bandwidth of
0.8 GHz achieved respectively.Figure 8 shows the 3D radiation pattern of this patch array antenna. It is clear
that the proposed patch array antenna provide radiation perfect pattern on which indicates that 3D circular
pattern has been achieved. Axial ratio of almost of one achieved 0 dB.
3.3 Design Triangular Polarized Patch Array Antenna of Different Shapes on liquid Crystal:
Figure 3 represents the scattered phase array patch antenna of different shapes on triangular shaped of
liquid crystal substrate. Dual frequency operations are observed at 13.83 GHz and 18 GHz respectively. The
obtained dual bandwidths are14 GHz at 1 GHz and 31 GHz at 2 GHz respectively. This is in full agreement with
the designed objective of this patch array see figure 3.61.Figure 9 shows the 3D radiation pattern of the
proposed patch antenna array of different shapes and size on the triangular liquid crystal. It is obvious that this
generated 3D radiations shows a perfect circular polarization radiation pattern .this indicates that a perfect 03D
radiation pattern has been achieved ie axial ratio0.0 dB can be obtained.
II. SIMULATION ANALYSIS
The designed antenna is simulated using ADS software.
Radiation Pattern of irregular shaped patch antenna

`
Radiation Pattern of rectangularshaped patch antenna
Radiation Pattern of Triangularshaped patch antenna
III. RESULTS & CONCLUSIONS
The objective of design and simulate of the proposed the three types of patch antenna array have been
achievedsuccessfully. The return losses of the three proposed antenna provide a dual band width operation. Also
high gain has been obtained as achieved. The advantage of using liquid crystal substrate over the existing
substrate is well known fact.see Table 1 summarized of the parameters of selected LCD patch antenna shape.
Improvement both the gain and directivity that have been achieved.
Gain
obtained
Return Loss
(dB)
Center
frequency
Bandwidth
Design 1 12.8 dB -30 30 GHz 4 GHz
Design 2 10.2 dB -35 13.2 GHz 3.2 GHz
Design 3 9.8 dB -20 15 GHz 3GHz
Table1
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