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In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
We have proposed an open terminated folded inverted-L antenna (FILA) with slits. In order to miniaturize the FILA, several slits are employed on the substrate surface. Folded structure is used for broadbanding. Design of the FILA to achieve broadband characteristics is shown. Simulation and measurement are implemented, and comparison of the results are evaluated. Finally, we calculate the product...
In this paper, a meander line dipole antenna for Ultra High Frequency Radio Frequency Identification (UHF RFID) tag applications is presented. The proposed antenna consists meandered dipole with end spiral conductor, an inductively coupled parasitic element for size miniaturization and T-loop for feed structure. The antenna is designed for North America UHF RFID frequency band (902–928 MHz) with Alien...
The main results of the investigation of the electrodynamic characteristics of a new type of antenna — an ultra-wideband, low-directional spiral antenna with coplanar feeding are presented and discussed. The use of such a method of feeding makes it possible to realize the excitation of the antenna without violating the planarity of the structure.
A planar microstrip-fed wideband circularly polarized antenna has been designed and investigated in this paper. First, a wideband linearly polarized antenna consisting of a rectangular ground plane and a rectangular radiating patch has been designed. To improve the impedance matching across a wide frequency range, the feeding line is formed of a 50Ω microstrip line and a tapered impedance transformer...
In this paper, a compact broadband RFID(radio frequency identification) tag antenna mountable on metallic object is proposed. The proposed antennas is contained two layers, a radiating patch with slots is printed on the upper dielectric substrate and the under dielectric substrate is surrounded by metal strap that with a slot. The input impedance of the antenna can be easily adjusted by changing slots...
This work presents the design of a broadband modulated scattering technique (MST) probe. The MST probe works in the whole X band 8–12 GHz and achieves an operative range of about 15 meters with a limited amount of power. The communication between the reader and the tag is obtained using the standard EM4102 RFID protocol to keep the compatibility with existing RFID systems. The information is carried...
This paper proposes a broadband circularly polarized antenna that is composed of inverted F and L antennas on the ground plane, and is allocated in a rotational symmetry. The height and diameter of our proposed antenna is respectively 0.10λ0 and 0.33λ0. The relative bandwidth satisfied with VSWR<3 in each band is 10.7% and 6.9%.
This paper discusses the antenna characteristics of a low-profile spiral antenna with a fan-shaped HIS/EBG reflector. The antenna radiates a circularly polarized (CP) wave. The analysis is performed using method of moment. First, antenna characteristics are demonstrated with both a spiral antenna located in free space, and also one backed by a PEC reflector. It is shown that the axial ratio (AR) deteriorates...
The influence of concentrated loads included in the antenna on the magnitude and shape of the current in the antenna wire and on the directional characteristics of such antennas is considered. It is shown that in antennas with in-phase current distribution this effect is much weaker than in antennas with a sinusoidal distribution law, that is, the inclusion of capacitive loads along the antenna wire...
In the paper the new type of a low-directional circular polarization antenna is presented. The antenna design is a planar spiral with a small number of turns of variable width, surrounded by a flat conducting screen. On the basis of numerical simulation, the frequency dependences of the main parameters of antenna for various design modifications are obtained and analyzed. In addition to wideband properties...
Multimedia equipment emission standard CISPR32 requires the use of a free-space antenna factor in radiated emission measurement of equipment under test (EUT). The calibration method for antennas to be used in radiated emission measurement is stipulated in CISPR16-1-6 and ANSI C63.5. In ANSI C63.5, because antennas used in a frequency range of 30 MHz to 1 GHz are susceptible to vertical polarization...
In this paper the problem of design optimization of a microwave wearable antenna is investigated. Reference is made to a specific antenna design that is wideband vee antenna which is characterized by 6 geometrical parameters. Those parameters were automatically adjusted with an evolution strategy based algorithm to obtain the impedance matching of antenna located in the proximity of the human body...
A novel three-section transmission line based T-type dual-band impedance transformer (DBIT) with its closed-form design equations is proposed in this paper. The proposed impedance transformer could transform two different complex impedances to a resistive load at two arbitrary real frequencies. A section transmission line is employed to transform the two different complex impedances to the same complex...
In this paper, an analysis of the Fat Patch Antenna with the extraordinary parasitic patch is described. For the numerical simulations, the Full Wave — CST Microwave Studio software is used. The element of the antenna is fed by the L-probe partially implemented in PCB. An excellent impedance matching is obtained (< −26 dB in the design frequency band 4.4–5 GHz). The radiation characteristics are...
This paper presents an interesting feature of the resonant slotted-waveguide antenna array: the difference pattern at off-center frequencies. Our demonstration uses a 12-element center-fed resonant slot array on rectangular waveguide. The simulation results show that the array produces a sum beam pattern at center frequency, and difference beam patterns at two off-center frequencies (around ±8%)....
A low-cost, high gain and broadband 30 GHz quasi_Yagi antenna with a corrugated substrate is presented. The corrugation design parameters provide a high flexibility to enhance antenna characteristics. The proposed antenna provides a gain of 17.7 dB at 30 GHz, a high total radiation efficiency of ∼94.4%, an impedance bandwidth covers the 24–31.6 GHz band and in-band crosspolarization of less than 37...
In this study, a wideband terahertz antenna for indoor wireless communication systems is proposed. Antenna has high input impedance which is reasonable for terahertz systems due to the high output impedance of terahertz sources. Proposed antenna has been designed to operate in 0.67 THz which is one of the appropriate frequencies considering the atmospheric attenuation conditions for short range indoor...
Terahertz (THz) wave frequency region is part of the electromagnetic spectrum. This spectrum is located between 0.3 THz to 10 THz or between radio waves and optics. The THz frequency region has potentials in many different applications, such as imaging, spectroscopy, and wireless communication. However, some problems are still remaining and should be solved to develop THz technology system for an...
The electrodynamic parameters of fractal double-ring antennas are presented in the article. The design of these antennas is based on the topology of circular fractal lakes. The frequency dependences of the input impedance, the standing wave coefficient, and the directional properties of two-ring antennas are calculated and analyzed. Calculations of the characteristics, produced by numerical simulation,...
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