600 research outputs found
Design of Triple-band Dipole-type Antenna with Dual-band Artificial Magnetic Conductor Structure
A design of dual-band high-impedance surface
called Artificial Magnetic Conductor (AMC) is presented. The
AMC is designed to resonate at 0.92GHz and 2.45GHz. In this
paper also, the design parameters that influence the AMC
frequencies are discussed. The designed AMC then is
incorporated with the designed triple-band printed dipole
antenna (operating at 0.92GHz, 2.45GHz and 5.8GHz). Here, the
performance of the dipole antenna with 2 and 4 unit cells of
0.92GHz and 2.45GHz AMC ground plane are presented. The
reported results show that, by applying the AMC structure as a
ground plane for the printed dipole antenna, the gain of the
dipole antenna can be increased due to the attracting feature of
the AMC surface that provide in-phase reflected waves with the
incident waves
A Meandered Triple-band Printed Dipole Antenna for RFID
In this paper, a meandered triple-band printed dipole antenna is proposed for Radio Frequency Identification (RFID). This meandered tri-band printed dipole antenna is
designed to operate at 0.92 GHz, 2.45 GHz and 5.8 GHz with the aid of Computer Simulation Technology (CST) software. In
order to achieve triple-band operation, the proposed antenna
contains two branch elements, which act as an additional
resonator. The designed antenna is fabricated using Taconic
RF-35 substrate with a dielectric constant (Er) of 3.5 and
thickness (h) of 0.508 mm. The antenna’s parameters for triple-band operation are investigated and discussed. Then, this fabricated antenna is integrated with the UHF microchip to become a passive UHF tag. This tag is tested by measuring the reading distance and it is found that the proposed tag can be used for RFID application
Design of controlled RF switch for beam steering antenna array
YesA printed dipole antenna integrated with a duplex RF switch used for mobile base
station antenna beam steering is presented. A coplanar waveguide to coplanar strip transition was adopted to feed the printed dipole. A novel RF switch circuit, used to control the RF signal fed to the dipole antenna and placed directly before the dipole, was proposed. Simulated and
measured data for the CWP-to-CPS balun as well as the measured performance of the RF switch are shown. It has demonstrated the switch capability to control the beam in the design of beam steering antenna array for mobile base station applications
Printed dipole array fed with parallel strip line for Ku-band applications
This paper presents the design procedure of a printed dipole antenna and 1D array configurations of the single dipole element in the Ku-Band with its metallic reflector plane parallel to the array plane. The proposed antenna has a natural beam tilt which is useful for some specific applications. Several array configurations in 1D are simulated and tested. The effect of mutual coupling among each array elements is also investigated. Required modifications on the individual array element and the feed structures due to the effect of mutual coupling are examined. The single dipole and array of dipole has measured VSWR values smaller than 2 in the Ku-Band with simulated gains of 5.7 dBi and 12 dBi, respectively. All the simulations are performed with ADS-2006A software and measurements are performed in an anechoic chamber
Compact and broadband antenna system at UHF
The aim of this research was to study a novel, broadband, low cost, low profile
and a high-medium gain antenna in the UHF band. This has been achieved through
numerical modelling, theoretical investigation and physical measurements. In this study
two commercially available antenna systems are investigated in order to compare and
establish potential deficiencies in the UHF antenna systems. A number of
disadvantages are resolved within a novel antenna system design. The parametric
study is performed for each element of the novel antenna system in order to optimise its
overall performance.
The indoor and outdoor measurements have been carried out in house, in order
to validate the predicted results. The novel antenna system is compared to the most
popular and commercially available UHF antenna systems. The study demonstrates
that the novel antenna system has clear advantages such as broadband, balanced,
compact and low cost when compared to the commercial antenna designs studied here.
The comparison of the manufacturers’ data to the measured results shows a good
match, validating the outdoor measurements technique used in this research
A High Gain Pattern Reconfigurable Micro-strip Dipole Antenna with a Gain Enhancing Partially Reflecting Surface
A beam reconfigurable antenna with high gain is presented with low complexity switching capability. The design consists
of a printed dipole antenna with reconfigurable parasitic elements that are combined with a partially reflecting surface (PRS) to
provide main lobe radiation pattern switching between boresight and close to end-fire at an operating frequency of 1.81GHz. The
reconfigurability is achieved using only two PIN diodes and the measured gain of the antenna is 8.5dBi gain at boresight and
14.3dBi towards the end-fire direction
Design and comparison of printed antennas using meander line technique
The interest for compact antennas in wireless communication increase due to the portability and mobility of the communication devices. Generally, an antenna at low frequency exhibits in large physical size. This project investigates the design of an antenna at 400 MHz. The simulation of the antenna has been performed using CST MWS. Since medical applications are dealing with low frequency, it will lead to large size of antenna which brings a challenge for wireless personal area network (WPAN). It is well known that the antenna performance decreases (according to Chu’s equation) as the size of antenna decreases. Therefore, antenna miniaturization using Meander Line (ML) will be taking place to overcome the challenges. Thus, this paper presents a comparison between i) printed dipole antenna without meander line technique, ii) printed dipole with meander line technique and iii) printed monopole antenna with meander line technique. The results show that an estimation of reduction size by 50% can be achieved using Meander Line technique
Metasurface Cloaks to Decouple Closely Spaced Printed Dipole Antenna Arrays Fed by a Microstrip-to-Balanced Transmission-Line Transition
In this work, we present a numerical study of 1D and 2D closely spaced antenna arrays of microstrip dipole antennas covered by a metasurface in order to properly cloak and decouple the antenna arrays operating at neighboring frequencies. We show that the two strongly coupled arrays fed by a microstrip-to-balanced transmission-line transition are effectively decoupled in 1D and 2D array scenarios by covering the dipole antenna elements with an elliptically shaped metasurface. The metasurface comprises sub-wavelength periodic metallic strips printed on an elliptically shaped dielectric cover around the dipole antennas and integrated with the substrate. We present a practical design of cloaked printed dipole arrays placed in close proximity of each other and demonstrate that the arrays are decoupled in the near field and operate independently in the far field with their original radiation characteristics as if they were isolated
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