H011135565

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
e-ISSN: 2278-2834,p- ISSN: 2278-8735.Volume 11, Issue 1, Ver. III (Jan. - Feb .2016), PP 55-65
www.iosrjournals.org
DOI: 10.9790/2834-11125565 www.iosrjournals.org 55 | Page
Study of the Dielectric Superstrate Thickness Effects on
Microstrip Patch Antennas
V.Saidulu1
, K.Srinivasa Rao2
1
Associate Professor, Department of Electronics and Communication Engineering, Mahatma Gandhi Institute of
Technology, Hyderabad-75, India.
2
Professor (Retd.), Department of Electronics and Communication Engineering, DRK Institute of Science &
Technology, Hyderabad, India.
Abstract: Adielectric superstrate is touching the patch antennas has remarkable effects on antenna parameters.
This paper experimentally studiesthesuperstrate thickness effectson the patch antennas parameters and
compared their performances with without dielectricsuperstrate.The coaxial probe fed of rectangular, circular
and square patch antennas were designed with 2.4 GHz and fabricated on Arlondiclad 880 substrate.The
superstrate materials is also used same specifications ofsubstrate material for designing of the patch antennas.
It is found that there is a slight degradation in the performance of the antennas when the superstrate thickness is
touching the above the patch antennas. In particular, the resonant frequency will be shifted lower side, while
other parameters have slight variation in their values. In addition, it has also been observed that return loss and
VSWR increases, however bandwidth and gain decreases with the dielectric constant of the superstrate
thickness. This type of antennas were used for wireless, Wi-Fi and Blue-tooth applications
Index Terms: Rectangular patch antenna, circular patch antenna, square patch antenna, dielectric superstrate
(radome), resonate frequency, gain etc.
I. Introduction
A microstrip antenna consists of a radiating patch on one side of a dielectric substrate, which has a
ground plane on the other side. The patch conductors are normally copper or gold, can assume virtually any
shape, but regular shapes are generally used to simplify analysis and performance prediction. Ideally, the
dielectric constant of the substrate should be low (∈ 𝑟 < 2.5) to enhance the fringing fields that account for the
radiation [1-3].Microstrip antennas have been employed in the airborne and spacecraft system because of their
low profile and conformal nature. Many of these applications require a dielectric cover over the radiating
element to provide protection against heat, physical damage and other environmental hazards [2, 3, 6-22]. The
effect of the superstrate used on the patch antenna to provide protection from heat and environmental hazards
etc., results in change of important parameters like impedance, bandwidth (frequency range for SWR ≤ 2), gain,
resonant frequency etc. This geometry of microstrip patch with dielectric superstrate can form part of a specific
high performance airborne system. In view of this, it becomes imperative to investigate the effect of superstrates
on the performance of the microstrip patch antennas.
II. Antenna Specifications And Selection Of Substrate Material
The dielectric constants, loss tangents and thicknesses of the dielectric materials used in the
investigations are given in Table 1 and Table 2. Dielectric substrate of appropriate thickness and loss tangent is
chosen for designing the rectangular, square and circular MPAs. A thicker substrate is mechanically strong with
improved impedance bandwidth and gain. However it also increases weight and surface wave losses. The
dielectric constant (∈ 𝑟 ) plays an important role similar to that of the thickness of the substrate. A low value of
∈ 𝑟 for the substrate will increase the fringing field of the patch and thus the radiated power. A high loss tangent
(tan𝛿) increases the dielectric loss and therefore reduces the antenna performance. The low dielectric constant
materials increase efficiency, bandwidth and radiation [1-3, 6].
Keeping these aspects in mind, the rectangular, square and circular MPAs are fabricated on
Arlondiclad 880 dielectric substrate, whose dielectric constant (∈ 𝑟1) is 2.2, loss tangent (tan𝛿) is 0.0009,
thickness (ℎ1) is 1.6 mm and appropriate substrate dimensions.
Table 1: Specification of dielectric substrate ∈ 𝑟1 material used in the design of patch antennas
Substrate material Dielectric constant (∈r1 ) Loss tangent (𝑇𝑎𝑛𝛿)
Thickness ofthe substrate
(ℎ1), mm
Arlondiclad880 2.2 0.0009 1.6

Study of the Dielectric Superstrate Thickness Effects on Microstrip Patch Antennas
Table 2: Specification of dielectric superstrate ∈ 𝑟2 materials used to study the effect of the superstrate
thickness on the performance of the patch antennas
Superstrate materials Dielectric constant (∈ 𝑟2 ) Loss tangent (𝑇𝑎𝑛𝛿) Thickness ofthe superstrates (ℎ2),mm
Arlondiclad880 2.2 0.0009 1.6
III. Design Formulae
(A) Effective Dielectric Constant:
The effective dielectric constant has values in the range of 1 <∈ 𝑟𝑒𝑓𝑓 <∈ 𝑟 . For most applications where the
dielectric constant of the substrate is much greater than the unity (∈ 𝑟 ≫ 1), the value of ∈ 𝑟𝑒𝑓𝑓 will be closer to
the value of the actual dielectric constant ∈ 𝑟 of the substrate. The expression for ∈ 𝑟𝑒𝑓 𝑓 is given by [2]
∈ 𝑟𝑒𝑓𝑓 =
∈ 𝑟+1
2
+
∈ 𝑟 −1
2
1 + 12
ℎ
𝑊
−1
2
, for 𝑊/ℎ > 1 .....(1)
(B) Effective Length and Effective Width:
The dimensions of the patch along its length have been extended on each end by a distance∆𝐿, which is a
function of the effective dielectric constant ∈ 𝑟𝑒𝑓𝑓 and the width-to-height ratio [2]
∆𝐿
ℎ
= 0.412
∈ 𝑟𝑒𝑓𝑓 +0.3
𝑊
ℎ
+0.264
∈ 𝑟𝑒𝑓𝑓 −0.258
𝑊
ℎ
+0.8
…. (2)
The effective length of the patch is now [2]
𝐿 𝑒𝑓𝑓 = 𝐿 + 2∆𝐿…..(3)
For an efficient radiator, a practical width that leads to good radiation efficiencies is [2]
𝑊 =
1
2𝑓𝑟 √𝜇0 ∈0
2
∈ 𝑟+1
=
𝜗0
2𝑓𝑟
√
2
𝜖 𝑟 +1
…. (4)
The actual length of the patch can now be determined L[2]
𝐿 =
1
2𝑓𝑟 √∈ 𝑟𝑒𝑓𝑓 √𝜇0∈0
− 2∆𝐿 …(5)
(C) Circular Patch Radius and Effective Radius:
The dimension of the patch is treated a circular loop, the actual radius of the circular patch antenna is given by
[2]
a =
𝐹
1+
2ℎ
𝜋 𝜀 𝑟
𝐹
𝑙𝑛
𝜋𝐹
2ℎ
+1.7726
1
2
…. (6)
Where F =
8.791×109
𝑓𝑟 √𝜀 𝑟
Equation (1) does not take into considerations the fringing effect. Since fringing makes the patch electrically
larger, the effective radius of patch is used and is given by [2]
𝑎 𝑒 = 𝑎 1 +
2ℎ
𝜋𝜀 𝑟
𝑙𝑛
𝜋𝑎
2ℎ
+ 1.7726
1
2
…. (7)
Hence, the resonant frequency for the dominant 𝑇𝑀110
𝑍
is given by [2]
𝑓𝑟 110 =
1.8412𝑣 𝑜
2𝜋𝑎 𝑒√ 𝜀 𝑟
…. (8)
Where 𝑣0is the velocity of light
IV. Design Of Patch Antennas And Thier Geometry
The rectangular, square and circular microstrip patch antennas are designed at the center frequency of
2.4 GHz on Arlondiclad 880 substrate (∈ 𝑟1=2.2, ℎ1=1.6 mm), using expressions available in the standard
literature [2-21] and given by equations (4), (5) and (6). The designed dimensions of rectangular, square and
circular patch antennas are given in Table 3 and Table 4 respectively. The patch antennas are fed with coaxial
probe feed at a point where the input impedance of the patch is 50 Ω. The location co -ordinates (𝐹𝑋 , FY) are
found by simulation. The geometries of the rectangular, square andcircular patch antennas are shown in Fig.1
and Fig.2. In the geometry shown, 𝑊𝑠 = Substrate width, 𝐿 𝑠= Substrate length, 𝑊𝑃 = Patch width, 𝐿 𝑃 = Patch
length, a =Patch radius, D =Diameter of circular patch and(𝐹𝑥,𝐹𝑦 ) are the co-ordinates of the feed point.

(a) (b)
Fig. 1(a) Geometry of rectangularmicrostrip patch antenna and (b) Geometry of circular microstrip patch
antenna (Top view)
Fig. 2 Geometry ofsquare microstrip patch antenna (Top view)
Table 3: TheDimensions of the Rectangular and Square Patch Microstrip Antenna in mm
Type of Patch 𝑓𝑟 ∈ 𝑟1 ℎ1 𝑊𝑠 𝐿 𝑠 𝑊𝑝 𝐿 𝑝 𝐹𝑋, FY
Rectangular patch
antenna
2.4 GHz 2.2 1.6 100 100 49.40 40.30 10.5,0
Square patch antenna 2.4GHz 2.2 1.6 100 100 33.60 33.60 10.0,0
Table 4: The Dimensions of the Circular MicrostripPatch Antenna in mm.
𝑓𝑟 ∈ 𝑟1 ℎ1 𝑊𝑠 𝐿 𝑠 D 𝐹𝑋, FY
2.4 GHz 2.2 1.60 100 100 47.10 5.5,0
V. Dielectric Superstrateeffects
When microstrip antennas are covered with protective dielectric superstrate, the antenna resonant
frequency, bandwidth, gain and other parameters are altered, resulting in detuning, which may seriously degrade
the system performance. As the bandwidth of microstrip antennas is inherently low, it is important to determine
the effect of the dielectric layer on the resonant frequency and other parameters of patch antennas in order to
introduce appropriate corrections in the design of antenna. The change in the resonant frequency by placing the
dielectric superstrate can be calculated using the following the expression [1-3].
∇𝑓𝑟
𝑓𝑟
=
∈ 𝑒− ∈ 𝑒𝑜
∈ 𝑒
….(9)
If ∈ 𝑒 =∈ 𝑒𝑜 + ∇∈ 𝑒 and∇∈ 𝑒 ≤ 0.1 ∈ 𝑒𝑜 ,

∆𝑓𝑟
𝑓𝑟
= 1
2
∆∈ 𝑒
∈𝑒 𝑜
1+1
2
∆∈ 𝑒
∈𝑒 𝑜
…. (10)
Where,
∈ 𝑒 = Effective dielectric constant with dielectric superstrate
∈ 𝑒 𝑜=Effective dielectric constant without dielectric superstrate
∆∈ 𝑒 = Change in dielectric constant due to dielectric superstrate
∆𝑓𝑟 =Fractional change in resonance frequency
𝑓𝑟 =Resonce frequency
VI. Experimental Results
The performance of the antenna is evaluated without dielectric superstrate using commercial
electromagnetic software such as High Frequency Structure Simulator (HFSS). Then the change in performance
of the antenna is studied with dielectric superstrate thickness as mentioned in Table 2. The measurements were
carried out by using
 Network Analyzer (HP E5071C) to measure the return-loss (VSWR), Center frequency and Bandwidth and
 Anechoic chamber to measure the radiation characteristics. The antenna under test (patch antenna with and
without dielectric superstrate) is used as receiving antenna and the transmitting antenna is a pyramidal horn
antenna (1-50 GHz). The radiation pattern measurements were carried out at 2.43GHz. The photograph of
fabricated rectangular and circular microstrip patch antennas without superstrates are shown in Figs 3 to 4
and with superstrate for measurement of return loss setup is shown in Fig.5
Fig. 3 Measurement set up for fabricated rectangular microstrip patch antenna without dielectric superstrate for
measurement of return loss (Free space radiation conditions).
Fig.4 Measurement set up for fabricated circular patch antenna without dielectric superstrate for measurement of
return loss (Free space radiation conditions).

Fig.5 Measurement set up for fabricated microstrip patch antenna with dielectric superstratefor measurement of
return loss
A. Rectangular, Square and Circular MPA under Free Space Radiation Conditions (Without
Superstrate)
The experimental measured results of VSWR, radiation patterns for the rectangular patch antenna
under free space radiation conditions i.e., withoutsuperstrate are shown in Figs.6, 7, 8 and 9 given below.
The resonant frequency is 2.40 GHz, same as the design frequency, the experimental measured results
of rectangular patch antenna bandwidth is 0.02 GHz (VSWR ≤ 2), and gain is 7.3dB. For circular patch antenna
bandwidth is 0.030 GHz (VSWR≤ 2) and gain is 6.7dB, whereas square patch antenna bandwidth is 0.046 GHz
(VSWR ≤ 2) and gain is 4.8dB. Radiation pattern simulation and measurements are carried out at the center
frequency for the case under consideration. The center frequency is found from return-loss measurements. For
free space radiation condition i.e., without superstrate the center frequency is occurring at 2.40 GHz and hence,
the radiation pattern measurements are carried out at this frequency i.e. at 2.40 GHz.
(a) Rectangular patch antenna (0.2mm) (b) Square patch antenna (0.2mm)

(c) Circular patch antenna (0.2mm)
Fig 5: Comparison of experimentally measured VSWR plot of (a) rectangular (b) circular and (c) square
microstrip patch antenna for∈ 𝑟1= 2.2without dielectric superstrates (Free space radiation conditions) at 2.4GHz.
B. Effect of the Superstrate on the Performance Characteristics of Rectangular, Square and Circular
Microstrip Patch Antenna
The effect of the superstrates with different thicknesses as mentioned in Tables 6 to 14
isexperimentally investigated on the performance characteristics of rectangular, circular and square microstrip
patch antenna, the measurements have been carried out for typical cases. The results are discussed below.
Superstrate with ∈ 𝑟2= 2.2 and ℎ2 =0.2 mm.
The effect of the superstrate having ∈ 𝑟2= 2.2, ℎ2 =0.2 mm on the performance characteristics of the
rectangular, circular and square patch is evaluated experimentally which are given in Table 6, from the results it
can be observed that the resonant frequency, gain and bandwidth will deteriorate when the superstrate is
touching the patch antenna. The measurements are carried out for with and without superstrate. The measured
results are shown in Figs6 to 8.The VSWR plot as a function of frequency is shown in Fig6. The impedance and
the radiation patterns plots are shown in Figs 7 and 8. The radiation patterns are measured at the resonant
frequency for the case under consideration. For the rectangular patch antennathe measured resonant frequency is
decreased to 2.38 GHz, thebandwidth is decreased to 0.024 GHz and gain is decreased to 4.29dB. For square
patch antennathe measured resonant frequency is decreased to 2.41 GHz, the bandwidth is decreased to 0.012
GHz and gain is decreased to 3.92dB. For circular patch antenna the measured resonant frequency is same as
designed frequency, the bandwidth is increased to 0.267GHz and gain is decreased to 1.42dB.
As compared to free space radiation conditions i.e without superstrate, for rectangular patch antenna,
the resonant frequency (𝑓𝑟 ) is 0.013 GHz (0.541% less), bandwidth is 0.003 GHz (19.5% less) and gain is
3.01dB (41.23% less). For square patch antenna, the resonant frequency (𝑓𝑟 ) is same as designed frequency,
bandwidth is 0.221 GHz (22.1% more) and gain is 3.38 dB (70.41% less). For circular patch antenna, the
resonant frequency (𝑓𝑟 ) is 0.01 GHz (0.833% more), bandwidth is 0.018 GHz (2.17 % less) and gain is 2.78dB
(60% less).

Fig 6: Comparison of experimental measured VSWR plot of (a) rectangular (b) Square and
(c)Circularmicrostrip patch antenna for 0.2mm thickness for superstrate dielectric constant ∈ 𝑟2= 2.2 at 2.4
GHz.
.
Fig 7: Experimental measured results of impedance plot for (a) Rectangular patch (b) Square patch and (c)
Circular patch for 0.2mm thickness for superstrate dielectric constant ∈ 𝑟2= 2.2 at 2.4 GHz.

(a) Rectangular patch antenna ( 0.2mm) (b) Square patch antenna (0.2mm)
Fig 8: Experimental measured results of VSWR for (a) Rectangular (b) Squareand (c) Circular patch antennas
for 0.2mm thickness for superstrate dielectric constant ∈ 𝑟2= 2.2 in HP at 2.4GHz.
Table 5: Comparison of experimental result for
rectangular, circular and square microstrip patch
antennas without dielectric superstrate∈ 𝑟1=2.2 (Free
space radiation conditions)
Table 6: Comparison of experimental measured
results for rectangular, circular and squaremicrostrip
patch antennas with dielectricsuperstrate thickness
0.2mm ∈ 𝑟2= 2.2

results for rectangular, circular and square microstrip
patch antennas with superstrate thickness 0.5mm
∈ 𝑟2= 2.2
patch antennas with dielectric superstrate thickness
0.8mm ∈ 𝑟2= 2.2
patch antennas with dielectric superstrate thickness at
1.0mm ∈ 𝑟2= 2.2
results for rectangular, circular and square
microstrippatch antennas with dielectric superstrate
thickness at 1.3mm ∈ 𝑟2= 2.2
results for rectangular, circular and
squaremicrostrippatch antennas with dielectric
superstrate thickness 1.5mm ∈ 𝑟2= 2.2
Table 12: Comparison of experimentalmeasured
results for rectangular, circular and
squaremicrostrippatch antennas with dielectric
superstrate thickness at 2.2mm ∈ 𝑟2= 2.2
patch antennas with dielectric Superstrate thickness at
2.4mm ∈ 𝑟2= 2.2
patch antennas with dielectric Superstrate thickness at
3.2mm ∈ 𝑟2= 2.2
VI. Results And Discussion
It is found there is degradation in the performance of the antenna when the superstrate is touching the
patch antenna. As compared to the with the free space radiation conditions (without superstrate),the
experimental results show that for rectangular patch antenna the measured resonant frequency is decreased to

2.387 GHz, thebandwidth is decreased to 0.024 GHz and gain is decreased to 4.29dB. For square patch
antennathe measured resonant frequency is same as designed frequency, the bandwidth is increased to 0.267
GHz and gain is decreased to 1.42 dB. For circular patch antenna the measured resonant frequency is 2.41 GHz,
the bandwidth is decreased to 0.012 GHz and gain is decreased to 3.92 dB.The return-loss and VSWR increases
as superstrate dielectric constant thickness increases. Measurements have been carried out for the above
mentioned superstrate using dielectric constant ∈ 𝑟2= 2.2 and h2 =0.2 mm. The VSWR as a function of
frequency and radiation patterns at center frequency are shown for superstrate∈ 𝑟2= 2.2 andh2 =0.2 mm is
shown in Figs 6 to 8.The optimum gain is obtained at 1.0mm which is 5.75dB for rectangular patch antenna,
5.88dB for circular patch antenna and 4.28dB for square patch antenna. The overall typical results for the
rectangular, circular and square patch antennas are given in Tables 6 to 14.
VII. Conclusion
The effect of dielectric superstrate thickness effects on the behavior of rectangular, circular and square
patch of microstrip antennas reveals that the superstrate thickness affects not only the resonance frequency but
also effects on other parameters such as gain, bandwidth, beam width, VSWR and return-loss. In particular, the
resonance frequency is shifted to lower side. The obtained results indicate that return loss and VSWR increases,
BW decreases with the different dielectric constant of the superstrates. The value of impedance, return loss and
VSWR are minimum, whereas BW is maximum for superstrate having dielectric constant ∈ 𝑟2 is 2.2, h2 =2.4
mm.
As compared to free space radiation conditions i.e without superstrate, for rectangular patch antenna,
the resonant frequency (𝑓𝑟 ) is 0.013 GHz (0.541 % less), bandwidth is 0.003 GHz (19.5 % less) and gain is 3.01
dB (41.23 % less). For square patch antenna, the resonant frequency (𝑓𝑟 ) is same as designed frequency,
bandwidth is 0.221 GHz (22.1 % more) and gain is 3.38 dB (70.41 % less). For circular patch antenna, the
resonant frequency (𝑓𝑟 ) is 0.01 GHz (0.833% more), bandwidth is 0.018 GHz (2.17 % less) and gain is 2.78 dB
(60 % less).
Acknowledgements
Authors wish to express their sincere thanks to Shri. M.BalacharySc’G, Head Antenna Wing, Associate
director, DLRL, for giving permission to utilize the antenna measurement facilities available at Defense
Electronics and Research Laboratory (DLRL), Hyderabad
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AUTHOR BILOGRAPHY
V.Saidulu was born in india, T.S, in 1974. He received the B.Tech in Electronics and Communication
Engineering from Nagarjunauniversity in 1998 and M.Tech in Electronics Engineering (Microwave) from
Banaras Hindu University (B.H.U), Varanasi, U.P in 2001 and pursuing Ph.D in Microstrip Antennas. He
worked as Assistant Professor from June 2001 to November 2006. Presently he is working as Associate
Professor from November 2006 to till date at MGIT, Hyderabad, in Electronics and Communication
Engineering. He has published 15 papers in International and National Journals and Conferences. His research
interests Microstrip antennas, Wireless Communication and Mobile Communication.
Dr. K. Srinivasa Rao, was born in Hyderabad, T.S, INDIA, in 1948. He received his B.E in ECE in the year
1973 from college of Engineering, Osmania University, Hyderabad, T.S. He worked as senior scientist in
Defence Electronics Research Laboratory, Hyderabad from 1974-78 and as Lecturer in ECE Dept. college of
Engineering, O.U. from 1978 -83. He worked as Associate Professor in ECE Dept. CBIT, O.U. from 1983-88.
He worked as Senior Scientist in NERTU, O.U. from 1988-90 and carried out his research work in the area of
Microwaves. He received his Ph.D. degree in the year 1995. He was promoted as Professor, ECE in CBIT in
1995 and worked there from 1995-97 and 2000-2008. He worked as Professor and Head, Dept. of VNRVJIET,
Hyderabad, T.S. from 1997-2000. After retiring as Professor, ECE in CBIT in 2008, he has been working in
various Private Engineering Colleges and presently he is working as Professor in ECE, in DRK Institute of
Science& Technology, JNTUH, Hyderabad.

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