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This study presents an inkjet printed textile antenna realised using a novel fabrication methodology. Conventionally, it is very difficult to inkjet print onto textiles because of surface roughness. This study demonstrates how this can be overcome by developing an interface coated layer which bonds to a standard polyester cotton fabric, creating a smooth surface. A planar dipole antenna has been fabricated,...
Enhanced wideband transition between coplanar waveguide (CPW) and broadside coupled stripline (BCS) with arbitrary characteristic impedance ratio is developed on a basis of an improved tightly coupling, via-hole-free structure. The E-field of CPW gradually changes to that of BCS within a wide bandwidth with ratio up to 10.4:1. Parametric studies of the transition are carried out and four different...
In this study, a novel technique to achieve multi-band performance for both reduced and conventional size circular microstrip patch antennas loaded with metamaterial has been proposed. Incorporation of symmetric slotting concept with the concept of additional mode modification for both MNG (?? negative) and ENG (?? negative) metamaterial loaded circular patch antennas have been shown. The use of metamaterial...
The short backfire antenna (SBA) has been widely used for mobile satellite communications, tracking, telemetry and wireless local-area network applications. A dual-polarised wideband SBA excited by a hybrid configuration of waveguide and ortho-mode transducer is described here. The bandwidth widening of the antenna is achieved by the appearance of the second resonance point, owing to the parasitic...
Reducing the mutual coupling of antenna elements in 60 GHz phased arrays is an important issue because it directly affects the input impedance matching and radiation performances. This study presents an electromagnetic band-gap (EBG) based design using corrugated structures to reduce the mutual coupling between two closely placed antenna elements. An isolation enhancement of 3.6 to 10.3 dB was achieved...
The authors propose a novel direction-of-arrival (DOA) estimation method for signals that are uncorrelated, partially coherent or fully coherent in the presence of multipath propagation. First, uncorrelated and coherent signals are distinguished by the rotational invariance techniques as well as the property of the moduli of eigenvalues. The DOAs of the uncorrelated signals are then estimated based...
A new kind of asymmetrical stub-loaded resonator is proposed and applied to design a dual-band bandpass filter (BPF) with independently controllable frequencies and bandwidths. The asymmetrical stub-loaded resonator presented in this study has more superior performance than the conventional symmetrical stub-loaded resonator. By appropriately selecting the lengths of the loaded stubs of the resonator,...
Interaction of low temperature high collisional combustion plasma with electromagnetic wave energy results in a phase lag of the incident wave. If normalised collision frequency {(ϕeff)/2πfo} is much greater than unity (1), the phase shift (Δ/phi/) varies linearly with plasma frequency, and hence with ionisation in plasma. Ionisation in vegetation fires (highly collisional atmospheric pressure plasma)...
A novel 'coplanar waveguide'-fed planar monopole antenna with dual-band operation for WiFi and 'long-term evolution 4G (LTE)' applications is presented. The simple antenna??s geometry is composed of a circular radiating patch with a smiling slot, and it occupies a small size of 41.6(L) ?? 28.38(W) ?? 1.52(h) mm3. Two operating bands covering 2.30-3.0 and 4.7-5.9 GHz are achieved by carefully optimising...
Reflection and transmission properties of a new type of frequency selective surface (FSS) made of zigzag metallic elements placed periodically on a dielectric substrate are investigated theoretically for arbitrary polarisation. The electric field integral equation technique with the subdomain overlapping piecewise sinusoidal basis functions are employed to compute the unknown current coefficients...
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