scholarly journals Research of Dumbbell Shaped DGS to Enhance the Bandwidth and Multiple Band Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 4584-4589
Keyword(s):  
Satellite Communications ◽  
Radiation Characteristics ◽  
Resonant Frequencies ◽  
Rectangular Patch ◽  
X Band ◽  
Epoxy Material ◽  
Multiple Band ◽  
Radar Satellite ◽  
Electrical Permittivity ◽  
Peak Gain

A monopole microstrip rectangular patch with dumbbell shape slotted on ground for multiple band, enhance the bandwidth. The proposed antenna is fabricated on FR 4 epoxy material with electrical permittivity of 4.4 and magnetic permeability 1.The dimensions of proposed antenna are 70 x 50 x 1.6 mm3 and the dumbbell shape is slotted on ground of substrate which resonates at four different frequencies 5.9 GHz, 7 GHz, 8.7 GHz and 9.7 GHz. The proposed antenna has bandwidths of 200 MHz 300 MHz, 300 MHz, 300 MHz at four resonant frequencies The proposed antenna covers 4/8 GHz C band, 8/12 GHz X band and used in radar, satellite communications. The reflection coefficient (S11), radiation characteristics, peak gain and VSWR of designed antenna are described

scholarly journals Miniaturization of Strips loaded Hexagonal Microstrip Patch Antenna for Advanced Communication

2019 ◽  
Vol 8 (12) ◽  
pp. 2753-2757
Keyword(s):  
Patch Antenna ◽  
Coplanar Waveguide ◽  
Wide Band ◽  
Microstrip Patch Antenna ◽  
Ultra Wide Band ◽  
Radiation Characteristics ◽  
Resonant Frequencies ◽  
Microstrip Patch ◽  
X Band ◽  
Epoxy Material

A spiral fork shaped hexagonal micro strip patch antenna is designed to operate at different frequencies, which are in ultra-wide band range (3.1-10.6GHz). The newly presented antenna is simulated on a Flame Retardant - 4 (FR4) epoxy material with dielectric constant 4.4and overall size of structure is 28*28mm2 . Coplanar waveguide feeding (CPW) is used in this design for easy simulation. This proposed triband structure resonates at 1.36GHz, 5.74GHz and 8.8GHz. The proposed pentaband antenna resonates at 2.38GHz, 3.64GHz, 6.76GHz, 7.36GHz and 8.98GHz with corresponding impedance bandwidths are 200MHz, 70MHz, 170MHz, 520MHz and 420MHz. The peak gains at their resonant frequencies are 1.77dB, 2.45dB, 3.53dB, 4.54dB and 2.28dB respectively with good radiation characteristics. These antennas are suitable for S - , C - and X - band applications.

scholarly journals Design of dual and Wideband Rectangular Patch Antenna for C and X Band Applications

2018 ◽  
Vol 7 (5) ◽  
pp. 145-150 ◽  
Author(s):  
S. Lakrit
Keyword(s):  
Patch Antenna ◽  
Satellite Communications ◽  
Microstrip Antennas ◽  
Dual Band ◽  
Wireless Applications ◽  
Rectangular Patch ◽  
Narrow Bandwidth ◽  
X Band ◽  
Resonance Frequencies ◽  
Radar Satellite

In this paper, we resolve two issues of microstrip antennas, which are miniaturization and efficiency behavior. For  that, a rectangular patch antenna with 16×18×1.6 mm3 dimensions with dual-band characteristics, was designed, fabricated and characterized.  In order to improve the problem of narrow bandwidth in  microstrip antennas, we implement in this study the slot  technique, allowing us to achieve our purpose. This technique,  lead to a good reflection coefficient and VSWR. The  characteristics of the fabricated antenna were measured and  analyzed by Vector Network Analyzer. The results show two  resonance frequencies that define two bandwidths defined by a  return loss less than -10 dB and are respectively; 7.47 GHz at a  frequency of 400 MHz, and 11.01 GHz at a frequency of 790  MHz. Also, the obtained gain has a good value and it’s very  remarkable according to the small size of the structure, with  a peak value of 6.1 dB at 12.5 GHz.  The small size and good characteristics enlarged the applications  domains of our structure, from telecommunications and  especially Radar, satellite communications to medical and  wireless applications.

A Series of Frequency Shift Antennas Based on Shape Blending

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Aiting Wu ◽  
Yuebin Sun ◽  
Pengquan Zhang ◽  
Tiejun Du
Keyword(s):  
Design Method ◽  
Slot Antennas ◽  
Radiation Characteristics ◽  
Initial Shape ◽  
Resonant Frequencies ◽  
X Band ◽  
Shape Blending ◽  
Specific Frequency ◽  
Radar Applications ◽  
Blending Process

In this paper, an automatic antenna design method based on the shape blending algorithm is proposed. The algorithm is used to construct the shape of the wide slot of a CPW-fed antenna. Firstly, two basic shapes are chosen as the initial shape and the target shape. The shape blending process is then applied on them to get a series of shapes, which are used as the geometry structure of the wide slot. In this way, a series of CPW-fed wide slot antennas are obtained. And they have similar but gradually changing characteristics. The bandwidth ranges are 8.00–9.24 GHz, 7.95–9.05 GHz, 7.05–8.55 GHz, 6.95–8.13 GHz, and 6.55–7.50 GHz, respectively. The overall size of the antenna is 26 mm  ∗  20 mm  ∗  0.6 mm. Experimental results show that the resonant frequencies vary (via translation) with the change of slot shape in a specific frequency band. The experiments also validate that the antennas have omnidirectional radiation characteristics. The radiation gains and aperture efficiencies of the antennas are about 3.8–5.5 dBi and 57.7–83.0% at their centre frequencies, respectively. The experiment results show that the proposed antennas could be used in C-band and X-band radar applications.

Four-element MIMO antenna for X-band applications

2021 ◽  
pp. 1-8
Author(s):  
Ali Eslami ◽  
Javad Nourinia ◽  
Changiz Ghobadi ◽  
Majid Shokri
Keyword(s):  
Tai Chi ◽  
Multiple Input Multiple Output ◽  
Resonant Frequencies ◽  
Circularly Polarized ◽  
Mimo Antenna ◽  
X Band ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Peak Gain ◽  
Good Agreement

Abstract This study presents a new design of a four-element multiple-input multiple-output (MIMO) antenna, which is suitable for X-band applications. The circular polarization (CP) operation in this work is attained by using Tai Chi-shaped patches and L-shaped feeds. The proposed four-element MIMO antenna achieves two resonant frequencies, the first one at around 7.75 GHz and the second one with CP radiation is at approximately 10.15 GHz frequency. The measured isolations between ports with 46.7 × 46.7 mm2 total dimensions are <−20 dB. Due to the experiments, the envelop correlation coefficient for the orthogonal and parallel ports of the proposed MIMO antenna is <0.003 and 0.005, respectively. Additionally, the presented antenna has a circularly polarized performance in the frequency band of 9.75–10.41 GHz and the average realized peak gain almost 2 dBic. The investigated antenna in this work is fabricated and tested in which the results are in a good agreement.

scholarly journals Performance Characteristics of Modified Sierpinski Fractal Antenna for Multiband Applications

2019 ◽  
Vol 8 (2) ◽  
pp. 2194-2200
Keyword(s):  
Communication Technology ◽  
High Frequency ◽  
Fractal Antenna ◽  
Efficient Tool ◽  
Radiation Characteristics ◽  
Resonant Frequencies ◽  
Antenna Structure ◽  
Rectangular Slot ◽  
High Frequency Structure Simulator ◽  
X Band

The emerging advanced wireless communication technology desires more compact, multiband, moderate gain antennas. These features can be accomplished by designing of the Fractal antennas with advanced features. This paper introduces a Modified Sierpinski Fractal antenna with compact, multiband and moderate gain specifications with an embedded Rectangular slot on the regular Sierpinski triangle . The fractalisation is extended from 0 to 4 iterations to examine the radiation characteristics. Two substrate materials ARLON, FR4-epoxy are considered individually with Ԑr values 2.2, 4.4 respectively and the height of the substrate is chosen as 1.6 mm. The efficient tool ANSYS HFSS High frequency structure simulator software package is used to design and simulate the proposed antenna structure in the frequency band of 1 to 10 GHz. The simulation results are reported and studied for all the four iterations in which the 4th iteration final geometry possess better results with 4 resonant frequencies that resonates in C band and X band in case of ARLON whereas 6 resonant frequencies obtained in the same frequency bands in case of FR4 epoxy. The multiband behavior can make these structures to serve in Satellite, Military and Radar wireless communications. The resultant gain values are also maximum about 13.67dB for ARLON and 7.69 dB for FR4-epoxy materials. It is also observed that the percentage of miniaturization of about 71.53% is obtained with this modified rectangular slotted fractal geometry, suitable to multiband applications.

scholarly journals Miniaturized Triple seven Shaped Microstrip patch Antenna for X band Satellite Communications

2018 ◽  
Vol 11 (19) ◽  
pp. 1-4
Author(s):  
V. Keral Shalini ◽  
M. Annakamatchi ◽  
S. Arthireena ◽  
◽  
◽  
...  
Keyword(s):  
Patch Antenna ◽  
Satellite Communications ◽  
Microstrip Patch Antenna ◽  
Microstrip Patch ◽  
X Band

scholarly journals Compact metamaterial inspired periwinkle shaped fractal antenna for multiband applications

2017 ◽  
Vol 7 (1.1) ◽  
pp. 507 ◽  
Author(s):  
B T P Madhav ◽  
M Venkateswara Rao ◽  
K Manisahithi ◽  
D S S Sarvani ◽  
M Dharani ◽  
...  
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Radiation Efficiency ◽  
Fractal Antenna ◽  
Split Ring ◽  
Flower Petal ◽  
Frequency Bands ◽  
Rectangular Patch ◽  
X Band ◽  
Radar Frequency

A compact periwinkle flower shaped fractal antenna loaded with split-ring resonator on either side of the feedline is proposed in this article. The proposed antenna consists of partial ground on flipside and a periwinkle flower petal is located on the rectangular patch. The proposed antenna works in multiband i.e., at 4.1GHz,4.5GHz,4.8Ghz(S-band) at 6.7GHz,6.75GHz(C-band) at 9.4GHz(X-band) and at 12.7(ku) i.e., proposed antenna covers almost one frequency at all radar frequency bands. The proposed antenna has been analyzed and maximum gain of 4dB and radiation efficiency of 87 percent is observed.

scholarly journals A Novel Circular Slotted Microstrip-Fed Patch Antenna with three Triangle Shape Defected Ground Structure for Multiband Applications

2018 ◽  
Vol 7 (3) ◽  
pp. 56-63 ◽  
Author(s):  
A. Jaiswal ◽  
R. K. Sarin ◽  
B. Raj ◽  
S. Sukhija
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Impedance Matching ◽  
Ground Plane ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Resonant Frequencies ◽  
Wireless Applications ◽  
Rectangular Patch ◽  
Miniaturized Antenna

In this paper, a novel circular slotted rectangular patch antenna with three triangle shape Defected Ground Structure (DGS) has been proposed. Radiating patch is made by cutting circular slots of radius 3 mm from the three sides and center of the conventional rectangular patch structure and three triangle shape defects are presented on the ground layer. The size of the proposed antenna is 38 X 25 mm2. Optimization is performed and simulation results have been obtained using Empire XCcel 5.51 software. Thus, a miniaturized antenna is designed which has three impedance bandwidths of 0.957 GHz,  0.779 GHz, 0.665 GHz with resonant frequencies at 3.33 GHz, 6.97 GHz and 8.59 GHz and the corresponding return loss at the three resonant frequencies are -40 dB, -43 dB and -38.71 dB respectively. A prototype is also fabricated and tested. Fine agreement between the measured and simulated results has been obtained. It has been observed that introducing three triangle shape defects on the ground plane results in increased bandwidth, less return loss, good radiation pattern and better impedance matching over the required operating bands which can be used for wireless applications and future 5G applications.

scholarly journals Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2935 ◽  
Author(s):  
Syed Shah ◽  
Sungjoon Lim
Keyword(s):  
Liquid Metal ◽  
High Gain ◽  
Dipole Antenna ◽  
Microfluidic Channels ◽  
Resonant Frequencies ◽  
Continuous Tuning ◽  
Microfluidic Technology ◽  
Peak Gain

In this paper, a frequency reconfigurable quasi-Yagi dipole antenna is proposed by leveraging the properties of microfluidic technology. The proposed antenna comprises a metal-printed driven dipole element and three directors. To tune resonant frequencies, microfluidic channels are integrated into the driven element. To maintain a high gain for all the tuned frequencies, microfluidic channels are also integrated into the directors. Therefore, the length of the driven-element as well as directors can be controlled by injecting liquid metal in the microfluidic channels. The proposed antenna has the capability of tuning the frequency by varying the length of the metal-filled channels, while maintaining a high gain for all the tuned frequencies. The proposed antenna’s performance is experimentally demonstrated after fabrication. The injected amount of liquid metal into the microfluidic channels is controlled using programmable pneumatic micropumps. The prototype exhibits continuous tuning of the resonant frequencies from 1.8 GHz to 2.4 GHz; the measured peak gain of the proposed antenna is varied in the range of 8 dBi to 8.5 dBi. Therefore, continuous tuning with high gain is successfully demonstrated using liquid-metal-filled microfluidic channels.

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