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New research on wearable electronics, domotics, flexible circuits, and RF applications on conformal surfaces have used the advancements of material science and additive manufacturing technology. Parallelly, the limited design specifications of industrially available PCB substrates (i.e., flat substrates) has stimulated a de novo exploration for more complex electronic circuits with versatile geometries...
A dielectric materials measurement can provide important parameter information for wireless applications that require an antenna design in complex environments and for such measurements, an accurate calibration technique is critical to achieve consistency, accuracy and reliability. In this paper, a study on the calibration method of a dielectric probe is performed. Specifically, a Keysight's N1500...
As the requirements for wireless systems become more complex, researchers and designers are turning to unique technologies for solutions. In support of this, a new design that uses biocomposite filaments to additively manufacture substrates for microstrip transmission lines is presented here. In particular, the measured complex permittivity of the material manufactured with three different biocomposite...
Additive manufacturing is becoming more affordable and in recent years new techniques on implementing this emerging technology into microwave circuits are being developed. Therefore, understanding the propagation behavior of printed microstrip transmission lines implemented with these manufacturing techniques is needed. In this paper, the use of flexible and semi-rigid filaments to create substrates...
A key component in the design of a printed Van Array is the requirement of the transmission line (TL) interconnects between the elements to be a factor of the operating wavelength. This results in interconnects that introduce a 2π phase shift. Traditionally, meander-lines have been used to design these interconnects; however, one drawback is the large space required for the layout. In this paper,...
Conformal antennas printed on thin flexible sub-strates typically use copper conductors for the radiating portion of the designs. This paper presents an alternative to using copper conductors. More particularly, a novel compact monopole on a thin transparent substrate with 25 µm thick flexible graphene-based conductors for the radiating portion of the design is presented. The design was modeled in...
In this paper, a compact planar Ultra-Wideband (UWB) antenna array with 4 monopole radiators is presented. To enhance the isolation, polarization of nearly placed elements is exploited. The proposed MIMO antenna array is electrically small 50 × 39.8 mm2, printed on a low loss 1.524 mm thick Rogers TMM4 laminate with a dielectric constant of 4.5 and a loss tangent of 0.002. Simulation in HFSS and printed...
In this paper, an electrically small reconfigurable antenna fed by a co-planar waveguide(CPW) is proposed. The resonance is achieved by providing an extra path for current through additional meander lines which are attached with the main feed line. Two PIN diodes are used to reconfigure the antenna from 4.27 GHz to 3.56 GHz. The proposed antenna measures only 14.5 × 12.8 mm2 and is printed on a low...
A compact multiband design of a printed microstrip patch antenna with two rectangular U-shaped parasitic elements is introduced in this paper. The rectangular U-shaped parasitic elements were used for the 2nd and 3nd mode excitation, multi-band resonance and control of the resonance frequencies. The simulation and measurement results showed that the antenna resonates at the frequencies of 2:6 GHz,...
In this paper, an initial study on the possible use of carbon microfibers as a transmission line (TL) feed network in conformal microstrip antenna arrays was conducted. Initially, a 12.0 cm long 50 Ω microfiber transmission line was manufactured and the wave propagation properties were measured. These characteristics were then compared to the propagation properties of a traditional copper microstrip...
A compact planar Ultra-wideband Multiple-input Multiple-output antenna with two identical monopoles is presented in this paper. These monopoles are kept very close to each other at a distance of 5.5mm. Wideband isolation is obtained over the complete spectrum with a novel decoupling structure attached to the ground plane composed of an inverted y-shaped stub and a combination of horizontal and vertical...
This paper presents a compact dual-band dipole antenna with meander line radiating elements. The proposed antenna has a balanced structure with dimensions of 35×6×1.52 mm3, and mounted on a 36.2 × 100 mm2 floating ground plane. The balanced operation of the design is validated by incorporating a differential feed in the software simulation and a 180 ° hybrid junction is used for measurement with the...
The use of graphene-based conductors (GBC) as a transmission line (TL) is presented as a conventional TL possessing right-handed (RH) nature and its coupling characteristics are investigated. In order to verify and demonstrate the wave propagation of a GBC TL, a 120 mm long 50 Ω TL was fabricated and tested. Performance of the single GBC TL was then compared to the conventional microstrip TL, analyzing...
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