| Manuscript Title: | A Low Cost Circularly Polarized Microstrip Patch Antenna with Low Axial Ratio for UHF RFID Applications |
| Manuscript Id: | IJMOT-2020-2-11909 |
| Abstract: | This paper presents a low cost circularly polarized microstrip patch antenna with low axial ratio (AR) and broad AR beam width for ultra-high frequency (UHF) radio-frequency identification (RFID) applications. The proposed design utilizes the corner truncated technology along with a thicker substrate and large ground plane to achieve circular polarization and a low axial ratio. The substrate material for the antenna is FR-4, which has a dielectric constant of 4.3. The antenna is fed by using a 50-ohm feed line. Simulations are carried out using the CST (Computer Simulation Technology) Studio Suite software. The simulation results show that the proposed antenna has a reflection coefficient of less than -10dB from 886.23MHz to 924.96 MHz with a bandwidth of 38.73 MHz. The antenna provides the axial ratio less than 3dB for the frequency range from 915 MHz to 919 Mhz. Other antenna parameters, such as the directivity, gain, voltage standing wave ratio (VSWR) etc. are also presented and discussed. The antenna with optimized dimensions is fabricated and measured. The measured results show good agreement with simulated results. The fabricated antenna has a bandwidth of 57.527 MHz and achieves a minimum reflection coefficient of -27.97 dB at 914.045 MHz. |
| Authors: | Sheridan J. Naidoo, Ernest Bhero, Alwyn Hoffman, Pradeep Kumar |
| Submitted On: | 01-02-2020 |
| Pages: | 211-219 |
| Action: | [Full Paper]
No. of Downloads: 162 |
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| Manuscript Title: | Design and Analysis of Microstrip Wideband Bandpass Filter Using Open Stubs and Coupled Transmission Lines |
| Manuscript Id: | IJMOT-2020-2-11911 |
| Abstract: | In this letter, two different and simple designs of
wideband microstrip bandpass filters are presented. First
design is comprised of microstrip transmission lines with open
stubs and second one has a combination of microstrip
transmission lines with microstrip coupled lines section at
input and output ports. Designs are simple and effective,
thereby exhibiting good in-band and out-of-band filtering
characteristics. Resonant frequencies and location of
transmission zeros of proposed design are evaluated by
analysing their even and odd modes. These parameters can be
further restrained by altering filter?s dimensions. The filters are
designed at 6.85 GHz resonant frequency using FR4 substrate.
Filter?s vital parameters such as 3-dB bandwidth, fractional
bandwidth, insertion and return loss are optimized by EM
momentum analysis in high frequency ADS tool. The filters
designs are validated from its fabrication. The simple design of
filter makes it attractive for use in various wireless transceiver systems. |
| Authors: | Hussain Bohra, Anurag Garg, Mustafa Neemuchwala |
| Submitted On: | 05-02-2020 |
| Pages: | 220-227 |
| Action: | [Full Paper]
No. of Downloads: 55 |
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| Manuscript Title: | Compact Wideband Microstrip antenna with Modified ground plane |
| Manuscript Id: | IJMOT-2020-2-11917 |
| Abstract: | A novel compact wideband microstrip antenna with modified ground plane is proposed. The higher order ground modes of antenna along with patch fundamental mode yields 2.3 GHz (48%) wide impedance bandwidth. Maximum broadside gain obtained is 1.5 dBi with stable broadside radiation pattern. Almost 40% compactness is achieved by employing slots on ground plane as compared to its original form. Proposed antenna design is systematically explored with reasoning explaining its evolution on basis of modal behavior of antenna in response to ground slots. Similar antennas are redesigned at different frequencies using different substrates. |
| Authors: | Poonam Kadam, Dr. Amit Deshmukh |
| Submitted On: | 13-02-2020 |
| Pages: | 228-237 |
| Action: | [Full Paper]
No. of Downloads: 81 |
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| Manuscript Title: | An Enhanced Algorithm for Complex Permittivity Extraction at Microwave Frequencies |
| Manuscript Id: | IJMOT-2020-2-11921 |
| Abstract: | An efficient technique of complex permittivity extraction is employed to characterize low-loss conventional dielectric materials at microwave Ku-band. The computational approach eliminates mathematically the systematic errors of the experimental setup. This method needs two uncalibrated S-parameter measurements. The first is performed with a sample under test and the second is done with an empty rectangular waveguide. Three low-loss dielectric materials (Celotex, Plexiglas and Teflon) are characterized to validate experimentally the extraction method over the Ku-band frequencies [12-18] GHz. The average relative errors between the calibrated and uncalibrated results are then calculated and compared. The proposed method has been improved using the mobile average to the experimental results obtained from the uncalibrated measurements, therefore, the stability is then enhanced. |
| Authors: | Nawfal Jebbor, Rachid Chaynane, Seddik Bri, A. M. Sànchez |
| Submitted On: | 28-02-2020 |
| Pages: | 238-245 |
| Action: | [Full Paper]
No. of Downloads: 45 |
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| Manuscript Title: | Conformal RFID Tag for Liquid Level Detection in Large Tanks |
| Manuscript Id: | IJMOT-2020-3-21926 |
| Abstract: | This paper presents a novel conformal microstrip antenna used for liquid level identification. Designing an RFID tag antenna on a liquid detection is challenging due to the relative permittivity, high conductivity and the diversity of liquids. The antenna is designed to operate at a frequency of 0.90 GHz. The antenna structure is placed on Rogers Ultram 3850 flexible substrates with e_r=2.9 and a thickness of 0.1016 mm. The conformal antenna is designed to set on a cylindrical tank made from PVC material. The structure is simulated using CST software. The proposed antenna has a bandwidth of 0.82 GHz and the overall gain is around 3dB. The antenna is fabricated and measured. Good agreement is achieved between simulated and measured results. |
| Authors: | Bassant H. ElSwiefy, M.I Ahmed, Hala El Sadek, Wagdy.R Anis |
| Submitted On: | 08-03-2020 |
| Pages: | 246-250 |
| Action: | [Full Paper]
No. of Downloads: 31 |
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| Manuscript Title: | Area Optimized Low Noise Amplifier for Narrowband Receiver applications |
| Manuscript Id: | IJMOT-2020-3-21929 |
| Abstract: | A novel area optimized, CMOS Low Noise Amplifier (LNA) topology is presented in this paper. An active inductor based modified cascode LNA with dual common source transistors is proposed. A gyrator-C active inductor is used in the circuit which reduces the chip area compared to the passive inductor-based design. The amplifier is designed using 180nm CMOS process and the performance is studied using post-layout simulation at a center frequency of 2.4 GHz. The LNA is operated at a supply voltage of 1.8V. The active inductor based modified cascode LNA has a gain of 12.58 dB. The noise figure is 2.57 dB and the circuit consume a power of 5.63 mW. The P1dB and IIP3 are -19.85 dBm and -11.23 dBm respectively. The layout occupies an area of 0.002 mm2. The figure of merit of the proposed LNA is best when compared to the narrow band LNAs recently reported in the literature. |
| Authors: | Prameela B, Asha Elizabeth Daniel |
| Submitted On: | 13-03-2020 |
| Pages: | 251-258 |
| Action: | [Full Paper]
No. of Downloads: 48 |
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| Manuscript Title: | Wideband Designs of Rectangular Microstrip Antennas Using Parasitic Patches Coupled Along Radiating Edge |
| Manuscript Id: | IJMOT-2020-3-21933 |
| Abstract: | Proximity fed wideband and high gain designs of rectangular microstrip antennas gap-coupled with parasitic rectangular and H shape patches are proposed. In the L frequency band, optimum response with bandwidth of more than 60% and peak gain of 9.9 dBi is obtained for rectangular microstrip antenna with eight gap-coupled rectangular shape patches. Further gap-coupled configurations of H shape patches with rectangular patch is presented. This design provides bandwidth of above 950 MHz (65%) with peak gain of more than 9.5 dBi. The comparison for the proposed gap-coupled rectangular and H shape variations with reported antennas is presented. In the proposed gap-coupled designs, asymmetric placement of parasitic patches with respect to fed patch yields focused radiation in the one side of antenna which results in overall bandwidth and gain enhancement. |
| Authors: | Sanjay B Deshmukh, Amit A Deshmukh |
| Submitted On: | 24-03-2020 |
| Pages: | 259-268 |
| Action: | [Full Paper]
No. of Downloads: 48 |
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| Manuscript Title: | A Slot shaped EBG structure for improving the Isolation between Patch Arrays |
| Manuscript Id: | IJMOT-2020-3-21936 |
| Abstract: | The effect of surface waves in microstrip arrays plays a crucial role in the performance of the antenna design and parameters. There are various mutual coupling reduction techniques, such as Complementary Split Ring Resonator (CSRR), Defected Ground Structures (DGS), Decoupling networks, Electromagnetic Bandgap (EBG), Neutralization lines, Parasitic or Slot elements. Out of these, the EBG method is a key approach inculcated in the microwave antenna design because of its exclusive bandgap parameter. Mutual Coupling (MC) prevails due to the excitation of surface waves on the patches if Er is > 1. The excited surface waves can be minimized by implementing the EBG structures between antenna elements or on the ground surface of the substrate. This paper presents a miniaturized slot-shaped EBG design structure with cell dimensions,6.3mmx6.3mm. This structure is used to examine the effect of surface waves in patch arrays resonating at a 5.8 GHz frequency range. The proposed design has a reduced antenna size with high S12 and good radiation patterns. The use of a slot-shaped EBG design will modify the S-parameters S11< -10dB and S12 < -51dB and further changes the surface current distribution to avoid surface waves. This miniaturized structure can be utilized for the WLAN application. The antenna array and unit cell are designed and simulated using HFSS 13.0. The simulated results and measured results are in good agreement. |
| Authors: | K Vara Prasad, Dr. M V S Prasad |
| Submitted On: | 25-03-2020 |
| Pages: | 269-278 |
| Action: | [Full Paper]
No. of Downloads: 37 |
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| Manuscript Title: | Multiple Slots Loaded Rectangular Microstrip Antenna for Dual Polarized Multiband Response |
| Manuscript Id: | IJMOT-2020-3-21937 |
| Abstract: | Multiband response is commonly realized using microstrip antennas preferably using slot or stub. Patch resonant modes get highly affected in terms of their frequency and impedances with respect to proper selection of dimensions and positioning of slots or stubs. In this paper, by using variations of slots, a face-shape microstrip antenna derive from basic rectangular microstrip antenna is proposed for dual polarized multiband response. Slot position and dimension tunes higher order modes TM02 and TM12 with respect to fundamental mode TM10 resulting into dual polarized multiband response with impedance bandwidth of 1.5% to 2% at each band. Frequencies calculated using proposed resonant length formulations for each mode closely match with the simulated one. For gain enhancement arlon substrate design is proposed which gives broadside gain of 2.5 to 4.7 dBi across multiple frequencies. |
| Authors: | Aarti G. Ambekar, Amit A. Deshmukh |
| Submitted On: | 28-03-2020 |
| Pages: | 279-288 |
| Action: | [Full Paper]
No. of Downloads: 64 |
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