Effects of Dielectric Materials on Impedance Characteristics of Embedded Small Normal Mode Helical Antenna

2013 ◽  
Vol 446-447 ◽  
pp. 1059-1063 ◽  
Author(s):  
Yi Liao ◽  
Yuan Zhang ◽  
Zi Chang Liang ◽  
Jin Peng Fang ◽  
Wei Gao
Keyword(s):  
Wireless Communication ◽  
Resonant Frequency ◽  
Normal Mode ◽  
Finite Dimension ◽  
Dielectric Material ◽  
Complex Impedance ◽  
Dielectric Materials ◽  
Helical Antenna ◽  
Dielectric Parameters ◽  
Impedance Characteristics

The normal mode helical antenna (NMHA) is widely selected on RFID and wireless communication applications and often placed in a dielectric material for protection and miniaurization design. In this paper, the effects of dielectric materials with finite dimension on resonant frequency and impedance characteristics of embedded small NMHA were investigated. Three parameters related to the dielectric material were considered. Significant results were obtained by varying each one of these electrical dielectric parameters. It provides an effective guidance for designers to tune the antenna to desirable complex impedance when surroundded dielectric materials are employed.

Comparison between crystal structure and dielectric properties Nd(Mg1/2Ti1/2)O3 (NMT) and Nd(Zn1/2Ti1/2)O3 (NZT)

2021 ◽  
pp. 2150370
Author(s):  
Kouros Khamoushi ◽  
Vojislav V. Mitic ◽  
Jelena Manojlovic ◽  
Vesna Paunovic ◽  
Zlata Cvetkovic ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Resonant Frequency ◽  
Titanium Oxide ◽  
Single Phase ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Positive Temperature ◽  
High Property ◽  
High Relative Permittivity ◽  
Very High

The dielectric properties of Neodymium zinc titanium oxide (NZT) and Neodymium magnesium titanium oxide (NMT) were investigated. The single-phase ceramic was synthesized at various temperatures below 1650[Formula: see text]C. The result shows that the value of temperature of resonant frequency [Formula: see text] for NMT is higher than NZT. Our findings also indicate that the rare earth materials produce high property dielectric materials, despite the fact some elements produce lower negative value of temperature of resonant frequency [Formula: see text]. By doping a compound such as CaTiO3 which has a very positive temperature of resonant frequency ([Formula: see text] ppm/[Formula: see text]C) and a very high relative permittivity [Formula: see text], it is possible to tune NZT and MNT to achieve an excellent dielectric material. This work is under consideration. The results of this scientific research could be very important for modern advance applications in microelectronic miniaturization.

scholarly journals A Displacement Sensor Based on a Normal Mode Helical Antenna

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3767 ◽  
Author(s):  
Xue ◽  
Yi ◽  
Xie ◽  
Wan ◽  
Ding
Keyword(s):  
Resonant Frequency ◽  
Normal Mode ◽  
High Frequency ◽  
Displacement Sensor ◽  
Helical Antenna ◽  
Frequency Shifts ◽  
High Frequency Structure Simulator ◽  
Resonant Frequency Shift ◽  
Gradient Change ◽  
Applied Displacement

This paper presents a passive displacement sensor based on a normal mode helical antenna. The sensor consists of an external helical antenna and an inserting dielectric rod. First, the perturbation theory is adopted to demonstrate that both the electric intensity and magnetic intensity have a noticeable gradient change within the in-and-out entrance of the helical antenna, which will cause the sensor to experience a resonant frequency shift. This phenomenon was further verified by numerical simulation using the Ansoft high frequency structure simulator (HFSS), and results show the linear correlation between the retrieved resonant frequency and the displacement. Two sets of proposed sensors were fabricated. The experiments validated that the resonant frequency shifts are linearly proportional to the applied displacement, and the sensing range can be adjusted to accommodate the user’s needs.

scholarly journals Design of a wideband strip helical antenna for 5G applications

2020 ◽  
Vol 9 (5) ◽  
pp. 1958-1963
Author(s):  
Mohammed Yousif Zeain ◽  
M. Abu ◽  
Z. Zakaria ◽  
Ahmed Jamal Abdullah Al-Gburi ◽  
R. Syahputri ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Resonant Frequency ◽  
Circular Polarization ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Helical Antenna ◽  
Wireless Applications ◽  
Potential Applications

This paper presents the design of wideband strip helical antenna for 5G Application. The strip helical antenna is designed for 5G and wideband applications that provide a wide bandwidth and circular polarization. The helical antenna is planned on at 5.8 GHz frequency by using Teflon material. The new designed strip is printed on a substrate then rolled into a helix shape to achieve circular polarization without an impedance matching and that the proposed antenna can be used for potential applications in wideband wireless communication. A wideband bandwidth of 2.41 GHz with a resonant frequency at 5.8 GHz is achieved by the helical antenna on the Teflon substrate. The presented antenna on Teflon substrate has achieved a gain of 11.2 dB. The antenna design parameters and the simulated results are achieved using the commercial software CST. The proposed antenna can be used for various wireless applications such as Wideband, Ultra wideband, 5G and wireless Applications.

Impedance characteristics of two-wire helical antenna in normal mode

1998 ◽  
Vol 81 (12) ◽  
pp. 37-44 ◽  
Author(s):  
Keisuke Noguchi ◽  
Motoo Mizusawa ◽  
Takashi Yamaguchi ◽  
Yoshihisa Okumura
Keyword(s):  
Normal Mode ◽  
Helical Antenna ◽  
Impedance Characteristics

Mathematical model to predict the characteristics of polarization in dielectric materials: The concept of piezoelectrcity and electrostriction

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Mathematical Model ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Dielectric Material ◽  
Strain Curve ◽  
Dielectric Materials ◽  
Lead Zirconate ◽  
Simulation Software ◽  
Constitutive Law ◽  
Basic Material

Model was developed for the prediction of polarization characteristics in a dielectric material exhibiting piezoelectricity and electrostriction based on mathematical equations and MATLAB computer simulation software. The model was developed based on equations of polarization and piezoelectric constitutive law and the functional coefficient of Lead Zirconate Titanate (PZT) crystal material used was 2.3×10-6 m (thickness), the model further allows the input of basic material and calculation of parameters of applied voltage levels, applied stress, pressure, dielectric material properties and so on, to generate the polarization curve, strain curve and the expected deformation change in the material length charts. The mathematical model revealed that an application of 5 volts across the terminals of a 2.3×10-6 m thick dielectric material (PZT) predicted a 1.95×10-9 m change in length of the material, which indicates piezoelectric properties. Both polarization and electric field curve as well as strain and voltage curve were also generated and the result revealed a linear proportionality of the compared parameters, indicating a resultant increase in the electric field yields higher polarization of the dielectric materials atmosphere.

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