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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
The results of the comparative evaluation of thermal noise parameters of plasma, dielectric and metal microwave antennas in a wide frequency range are given.
In this paper, a new broadband Frequency Selective Surface (FSS) electromagnetic absorber (EMA) is proposed. The absorber consists of circular metallic patches with different dimensions backed by a foam spacer and metallic ground. The patches provide different resonances resulting in improvement of the absorption characteristics of the proposed EMA. The reflection coefficient of the proposed EMA with...
This paper presents a two-port antenna for a passive RFID tag including separate receiving and transmitting ports for direct connection to a hybrid UHF/UWB RFID transponder chip. The receiving port feed is linearly polarized and narrowband for energy harvesting (from a conventional RFID reader), whereas the transmitting port feeds ultrawideband (UWB) slot radiation. Measurements results show that,...
A special kind of spiral planar circularly polarised (CP) antenna is presented. These antennas are based on an interaction between a cylindrical surface wave excited by an omnidirectional probe and an inhomogeneous surface impedance with a spiral pattern. The surface impedance interaction transforms a bounded TM0 surface wave into a circularly polarised leaky wave with almost broadside radiation,...
A complementary frequency selective surface (CFSS) is formed by placing an array of slots in close proximity to an array of its Babinet's complement i.e. dipoles. In this paper by adding an additional layer of periodic elements (dipoles/slots) to a CFSS metasurface the coupling among the arrays is increased thus causing a decrease in the resonant frequency of this proposed structure. The decrease...
A method of modelling creeping waves on PEC cylinders when illuminated by a perpendicular plane wave is discussed. The limitations of this technique will be considered, and an alternative method will be suggested for use with higher frequencies, and for the purposes of computing propagation constants.
In this paper, A miniaturized monopole UWB antenna with λ/4 meander slot line is presented. To achieve a considerable miniaturized antenna, a reference bowtie monopole antenna was simplified using the perfect magnetic wall condition. Also, to obtain rejection characteristic at the interference bandwidth of 5 GHz-WLAN, a meander shaped slot line was inserted at ground patch. In comparison with reference...
A new reconfigurable low profile microstrip patch antenna with switchable propagating modes for wireless body area network is presented. The directivity gain of the antenna is 6.8 dBi in the off-body mode, and 6.4 dBi in the on-body mode. The prototype covers the ISM 2.45 GHz band. The operating frequency of the antenna remains the same irrespective of the direction to which the beam is steered.
A dual broadband flexible butterfly loop antenna is designed to be worn on a human body which covers several important bands for wearable applications including the MedRadio band 402–406 MHz and ISM bands (433–434, 902–928 and 2400–2483.5) MHz. This antenna offers two wide bands for the reflection coefficient S11 −10 dB from 430–1003 MHz and 2004–2700 MHz with bandwidths of 573 and 696 MHz respectively...
A miniaturized branch-line coupler based on lowpass microstrip filters instead of conventional transmission lines is presented in this paper. The design of proposed couplers is performed using lowpass filter of 5th, 7th and 9th order. This is done to achieve a compact circuit layout in microstrip implementation. Prototypes with these proposed structures, operating at 2 GHz frequency, have been designed...
The low loss design of input and output triplexers for high power application is presented. The input triplexer is realized as a microstrip structure, which consists of three third order filters and a star-junction. For the output triplexer design, it is suggested to use a combination of the microstrip star-junction and three interdigital cavity filters. Both structures provide a low insertion loss...
In this paper, the field uniformity of axial electric field component inside an anisotropic jet engine environment is analyzed by using Ansys HFSS simulation tool. The standard deviation based approach is used for the analysis of uniformity in jet engine. Using full wave simulation analysis, the electric field values are extracted from the jet engine containing one set of 24 blades. Moreover, the...
We present a novel horn antenna to generate radio waves bearing Orbital Angular Momentum (OAM) by using a circular waveguide. The OAM mode ℓ = 1 is generated by using a spiral phase plate (SPP) inside a circular waveguide. We present here two methods to transform the classical guided modes to OAM wave. The resulting electrical field distribution and the radiation patterns evidence the properties of...
This paper presents the design of a 3D-printed flat graded-index lens based on ray optics. The lens is comprised of several concentric dielectric rings with bespoke relative permittivities for transforming spherical waves into plane waves. 3D-printing was used to fabricate this lens with graded and tailored dielectric properties in a single process. The 3D-printed flat lens is low-cost and light-weight,...
In this paper, we present a compact broadside superdirective antenna array based on a planar parasitic superdirective unit-element. The array is designed for 905MHz frequency band, its dimensions are 200 × 54 × 24mm3 (0.6λ × 0.16λ × 0.07λ), and it presents a directivity of 9.2dBi and radiation efficiency of 8.3%. Integrating the initial parasitic array in a PCB of 110 × 70mm2, the array total dimensions...
One outstanding feature of a conformai array or periodic surface is its ability to conform to a surface whilst maintaining the operational electromagnetic characteristics. A simple textile Frequency Selective Surface (FSS), fabricated using weaving technique has been evaluated in terms of its transmission properties on a flat surface and curved structure. Measurements confirm the FSS exhibits resonant...
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