scholarly journals Design and implementation of microstrip rotman lens for ISM band applications

2019 ◽  
Vol 8 (1) ◽  
pp. 90-98
Author(s):  
Mohammed K. Al-Obaidi ◽  
Ezri Mohd ◽  
Noorsaliza Abdullah ◽  
Samsul Haimi Dahlan ◽  
Jawad Ali
Keyword(s):  
Return Loss ◽  
Beam Steering ◽  
Center Frequency ◽  
Patch Antennas ◽  
Far Field ◽  
Frequency Bandwidth ◽  
Load Impedance ◽  
Ism Band ◽  
Design And Implementation ◽  
Rectangular Patch

This work presents the design and implementation of Rotman lens as a beam steering device for Industrial, Scientific, and Medical (ISM) applications. 2.45 GHz is considered as a center frequency design with (2-6) GHz frequency bandwidth. The beam steering is examined to cover ±21o scan angle with maximum main lobe magnitude 10.1 dBi, rectangular patch antennas are used as radiation elements to beam the output far field. The work is extended to compare between the tapered line which is used for matching between 50-Ω ports and lens cavity. CST microwave simulation studio results show that the rectangular taper line can yield 2 dB return loss less than linear taper line with a little bit shifting in responses for same input and load impedance.

scholarly journals DESIGN AND SIMULATION OF DIELECTRIC RESONATOR ANTENNA (DRA) WITH CO-AXIAL PROBE FOR WIRELESS APPLICATION

2020 ◽  
Vol 5 (2) ◽  
pp. 75-83
Author(s):  
Devansh Sinha ◽  
Mohit Vyas ◽  
Sanjay Singh Kushwah
Keyword(s):  
High Frequency ◽  
Dielectric Resonator ◽  
Return Loss ◽  
Ground Plane ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Frequency Bandwidth ◽  
Rectangular Patch ◽  
Wireless Application ◽  
Potential Parameters

In this paper a Dielectric resonator antenna (DRA) consists of a rectangular geometry and a printed rectangular patch on top of it in order to achieve better performance and operation without significant increase in antenna size. DRA structure is proposed at a height of 2 mm from the ground plane and patch incorporated at the height of 3.638 mm. This work is mainly focused on increasing the potential parameters of DRA and analyze high frequency band. The proposed antenna is designed to resonate at 25 GHz and by varying the DRA size ‘a, then the simulated results shows variation in Return Loss. The impedance bandwidth of the DRA (23.417 GHz-26.961 GHz) and return loss is 26.543951dB.The proposed DRA is analyzed and design using CST-MSW (2010). The simulated result shows the Far field, smith chart. We have estimated the wavelength, frequency, bandwidth, Return loss and directivity.                                      

scholarly journals Design of Dual Band Patch Antennas for Cellular Communications by Genetic Algorithm Optimization

2012 ◽  
Vol 1 (1) ◽  
pp. 26 ◽  
Author(s):  
Jeevani Jayasinghe ◽  
Disala Uduwawala ◽  
Jaume Anguera
Keyword(s):  
Genetic Algorithm ◽  
Practical Interest ◽  
Dual Band ◽  
Center Frequency ◽  
Patch Antennas ◽  
Algorithm Optimization ◽  
Genetic Algorithm Optimization ◽  
Rectangular Patch ◽  
Shorting Pin ◽  
Final Design

Designing multiband antennas with low volume becomes of practical interest for mobile telecommunications. This paper presents the designs of five small dual band patch antennas for GSM 1800 (1710-1880MHz) and Bluetooth (2400-2483.5MHz) applications using a genetic algorithm combined with MoM (Method of Moments). A substrate with dielectric constant 3.2 and height 8mm is used for the first two dual band designs. The height is reduced thanks to the optimization process to 6mm in the third design by inserting a shorting pin to the fragmented patch antenna. Further the height is reduced to 4mm in the by inserting two shorting pins. In the final design with three shorting pins, the height is only 3mm. The patch dimensions are similar to that of the conventional rectangular patch for the center frequency of the lowest frequency band but with the advantage of having dual-band operation at the desired bands. Genetic algorithm optimization is used to optimize the patch geometry, feed position and shorting positions. HFSS is used to carry out simulations. The antenna thickness is reduced from 8mm to 3mm by incorporating shorting pins which position is optimized by the genetic algorithm.

Implantable CPW-fed rectangular patch antenna for ISM band biomedical applications

2013 ◽  
Vol 6 (1) ◽  
pp. 101-107
Author(s):  
Srinivasan Ashok Kumar ◽  
Thangavelu Shanmuganantham
Keyword(s):  
Patch Antenna ◽  
Medical Diagnosis ◽  
Biomedical Applications ◽  
Return Loss ◽  
Simple Structure ◽  
Coplanar Waveguide ◽  
Human Muscle ◽  
Ism Band ◽  
Rectangular Patch ◽  
Implantable Antennas

Implantable antennas have recently been receiving substantial attention for medical diagnosis and treatment. In this paper, a coplanar waveguide-fed monopole antenna for industrial, scientific, and medical (ISM) band biomedical applications is proposed. The antenna has a simple structure is placed on human tissues such as muscle, fat, and skin. The designed antenna is made compatible for implantation by embedding it in an FR4 substrate. The proposed antenna is simulated using the method of moment's software IE3D by assuming the predetermined dielectric constant for the human muscle tissue, fat, and skin. The antenna operates in the frequency of ISM bands, 2.4–2.48 GHz. Simulated and measured gains attain −7.7 and −8 dBi in the frequency of 2.45 GHz. The radiation pattern, return loss, current distribution, and gain of these antennas were examined and characterized.

scholarly journals Single feed circularly polarized crescent-cut and extended corner square microstrip antennas for wireless biotelemetry

2019 ◽  
Vol 9 (3) ◽  
pp. 1902 ◽  
Author(s):  
Mehdi Hasan Chowdhury ◽  
Quazi Delwar Hossain ◽  
Md. Azad Hossain ◽  
Ray Chak Chung Cheung
Keyword(s):  
Return Loss ◽  
Microstrip Antennas ◽  
Antenna Design ◽  
Design System ◽  
Medical Applications ◽  
Frequency Bandwidth ◽  
Circularly Polarized ◽  
Ism Band ◽  
Feeding Technique ◽  
Simulation Results

<p>In this paper, the development of two novel circularly polarized microstrip antennas is thoroughly explained. These antennas are fed by coaxial feeding technique. One of the primary objectives of the proposed work is to tune the antennas to work in ISM band. This frequency band refers to the internationally recognized radio frequency bandwidth which is to be used explicitly for Industrial, Scientific, and Medical applications. Therefore, these antennas would be suitable to use in the field of wireless biotelemetry. Two new antenna design techniques have been introduced to produce circular polarization, and details of these schemes are described. The proposed microstrip antennas are designed and simulated on Advanced Design System (ADS) software. The return loss of the proposed crescent-cut antenna is -19.3 dB at the operating frequency. The extended corner antenna has the return loss of -29.3 dB at the tuned frequency. The simulation results are also presented and discussed.</p>

Bilayer split-ring chiral metamaterial based reconfigurable antenna for polarization conversion

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Preet Kaur ◽  
Pravin R. Prajapati
Keyword(s):  
Low Cost ◽  
Axial Ratio ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Split Ring ◽  
Circularly Polarized ◽  
Left Hand ◽  
Rectangular Patch ◽  
Mode 2 ◽  
Chiral Metamaterial

Abstract A bilayer split-ring chiral metamaterial converts the linearly polarized wave, into a nearly perfect left or right-handed circularly polarized wave. The proposed antenna is intended to operate at center frequency of 5.80 GHz with switchable polarization capability. The polarization re-configurability is achieved by electronically switching of two PIN-diode pairs, which are embedded into bilayer split-ring Chiral Metamaterial. The optimized length of rectangular patch is 16 mm and width is 12.1 mm. Two types of radiation characteristics offered by the proposed antenna; left hand circularly polarized in mode 1 and right hand circularly polarized in mode 2. Measured results show that its impedance bandwidth is 155 MHz from 5.70 to 5.855 GHz for both mode 1 and mode 2. The measured axial-ratio bandwidth is 100 MHz from 5.75 to 5.85 GHz for mode 1 and 110 MHz from 5.73 to 5.84 GHz for mode 2. Antenna has LHCP gain of 2.52 dBi and RHCP gain of −23 dBi in mode 1. RHCP gain of 2 dBi and polarization purity of about −20 dBi is obtained in mode 2. The proposed antenna has simple structure, low cost and it has potential application in field of wireless communication (i.e., WiMax, WLAN etc.).

Tunable balanced to balanced filtering power divider with high common-mode suppression

Frequenz ◽  
2020 ◽  
Vol 74 (7-8) ◽  
pp. 263-270
Author(s):  
Cao Zeng ◽  
Xue Han Hu ◽  
Feng Wei ◽  
Xiao Wei Shi
Keyword(s):  
Return Loss ◽  
High Selectivity ◽  
Power Divider ◽  
Center Frequency ◽  
Differential Mode ◽  
Common Mode ◽  
Mode Suppression ◽  
The Common ◽  
Equal Power ◽  
Good Agreement

AbstractIn this paper, a tunable balanced-to-balanced in-phase filtering power divider (FPD) is designed, which can realize a two-way equal power division with high selectivity and isolation. A differential-mode (DM) passband with a steep filtering performance is realized by applying microstrip stub-loaded resonators (SLRs). Meanwhile, six varactors are loaded to the SLRs to achieve the center frequency (CF) and bandwidth adjustment, respectively. U-type microstrip lines integrated with stepped impedance slotline resonators are utilized as the differential feedlines, which suppress the common-mode (CM) intrinsically, making the DM responses independent of the CM ones. A tuning center frequency from 3.2 to 3.75 GHz and a fractional bandwidth (12.1–17.6%) with more than 10 dB return loss and less than 2.3 dB insertion loss can be achieved by changing the voltage across the varactors. A good agreement between the simulated and measured results is observed. To the best of authors' knowledge, the proposed balanced-to-balanced tunable FPD is first ever reported.

Crosspolarisation characteristics of rectangular patch antennas

1988 ◽  
Vol 24 (8) ◽  
pp. 463 ◽  
Author(s):  
T. Huynh ◽  
K.F. Lee ◽  
R.Q. Lee
Keyword(s):  
Patch Antennas ◽  
Rectangular Patch

Coplanar waveguide-fed ISM band implantable crossed-type triangular slot antenna for biomedical applications

2013 ◽  
Vol 6 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Srinivasan Ashok Kumar ◽  
Thangavelu Shanmuganantham
Keyword(s):  
Biomedical Applications ◽  
Biomedical Application ◽  
Coplanar Waveguide ◽  
Impedance Matching ◽  
High Gain ◽  
Slot Antenna ◽  
Center Frequency ◽  
Ism Band ◽  
High Data ◽  
Implantable Antenna

A novel coplanar waveguide fed Industrial, Scientific, and Medical (ISM) band implantable crossed-type triangular slot antenna is proposed for biomedical applications. The antenna operates at the center frequency of 2450 MHz, which is in ISM band, to support GHz wideband communication for high-data rate implantable biomedical application. The size of the antenna is 78 mm3 (10 mm × 12 mm × 0.65 mm). The simulated and measured bandwidths are 7.9 and 8.2% at the resonant frequency of 2.45 GHz. The specific absorption rate distribution induced by the implantable antenna inside a human body tissue model is evaluated. The communication between the implanted antenna and external device is also examined. The proposed antenna has substantial merits such as miniaturization, lower return loss, better impedance matching, and high gain over other implanted antennas.

Mutual coupling between electromagnetically coupled rectangular patch antennas

1991 ◽  
Vol 27 (6) ◽  
pp. 532 ◽  
Author(s):  
R.Q. Lee ◽  
T. Talty ◽  
K.F. Lee
Keyword(s):  
Mutual Coupling ◽  
Patch Antennas ◽  
Rectangular Patch

scholarly journals Design and Modeling of New UWB Metamaterial Planar Cavity Antennas with Shrinking of the Physical Size for Modern Transceivers

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Mohammad Alibakhshi Kenari
Keyword(s):  
Transmission Lines ◽  
Patch Antenna ◽  
Patch Antennas ◽  
Frequency Bandwidth ◽  
Left Handed ◽  
Full Wave ◽  
Radiation Properties ◽  
Unit Cells ◽  
Constitutive Parameters ◽  
Large Frequency

A variety of antennas have been engineered with MTMs and MTM-inspired constructs to improve their performance characteristics. This report describes the theory of MTMs and its utilization for antenna's techniques. The design and modeling of two MTM structures withε-μconstitutive parameters for patch antennas are presented. The framework presents two novel ultrawideband (UWB) shrinking patch antennas filled with composite right-/left-handed transmission line (CRLH-TL) structures. The CRLH-TL is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. The CRLH-TL structures enhance left-handed (LH) characteristics which enable size reduction and large frequency bandwidth. The large frequency bandwidth and good radiation properties can be obtained by adjusting the dimensions of the patches and CRLH-TL structures. This contribution demonstrates the possibility of reducing the size of planar antennas by using LH-transmission lines. Two different types of radiators are investigated—a planar patch antenna composed of fourO-formed unit cells and a planar patch antenna composed of sixO-shaped unit cells. A CRLH-TL model is employed to design and compare these two approaches and their realization with a varying number ofL-Cloaded unit cells. Two representative antenna configurations have been selected and subsequently optimized with full-wave electromagnetic analysis. Return loss and radiation pattern simulations of these antennas prove the developed concept.

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