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This paper investigates a planar monopole antenna for fifth generation (5G) wireless communication networks. The proposed antenna has an ultra-wide band impedance response in millimeter wave (mmW) spectrum, 25–39 GHz covering Ka band. The antenna has unique structural layout resembling hexagonal honeycomb and has low profile (8×7 mm2) on 0.254 mm thick Rogers substrate, enabling the design for incorporation...
This paper presents a high-gain 6–40 GHz circularly polarized antenna system designed for a 6U CubeSAT mission for monitoring RF emission from earth. The antenna system consists of three quasi-tapered helical antenna elements, operating at 6–11 GHz, 11–22 GHz and 21–40 GHz, respectively. Each antenna element is designed to produce an end-fire beam with its helical diameter varying along its axis to...
This paper presents a planar, broadband, electrically-small, circularly polarized (CP), near field resonant parasitic (NFRP) antenna fed by a crossed dipole driver. The driven and parasitic elements are printed on two separate thin substrates, which are stacked together with no air-gap to achieve the compact planar configuration. The technique of introducing meander lines and arrowhead-shaped endings...
A broadband dual-polarized dual-dipole (DPDD) planar antenna is analyzed and designed for 2G/3G/4G base stations. The DPDD antenna consists of two perpendicularly crossed dual-dipole elements. Each dual-dipole element is comprised of two identical side-by-side dipoles which are connected through a coplanar strip line that also acts as an impedance transformer. Two dual-dipole elements are printed...
This paper presents an overview of the advances in single layer reflectarrays. In particular, it reports the progress in wideband reflectarrays and reconfigurable reflectarrays.
The non-Foster impedance circuits enhance the bandwidth performance of small antennas. This paper explores various conventional and novel techniques to realise non-Foster impedance and conclude their advantages as well as limitations. These design techniques includes conventional operational amplifiers (op-amps) and bipolar junction transistors (BJTs) and non-conventional graphene field-effect transistors...
A novel Phoenix cell for large band reflectarray antennas is presented here. The cell starts with a simple square patch whose phase shift is controlled by its sides' length. The size of the patch is then fixed and open-stubs with variable length are connected to it. To complete the phase range at the central frequency, the stub-loaded patch then shrinks gradually until it disappears completely allowing...
A novel compact size equilateral triangular ring-slot antenna is proposed for microsatellite. The presented antenna utilizes truncation, perturbation, and slits to generate wideband circular polarization (CP) operation from its inherited linear polarization. The fabricated antenna has wide CP performance of 1106 MHz or 52.27% of fractional bandwidth at 2116 MHz center frequency. The measured results...
This paper presents a wideband pyramidal sinuous antenna, over a conducting ground plane, for use as a reflector antenna feed. Specific attention is given to comparisons with a similar structure where the sinuous shape is instead projected onto a cone. The pyramidal structure is significantly simpler to manufacture, and measured results confirms this where close agreement with simulations is observed.
In many angle of arrival (AoA) estimation algorithms for broadband signals a-prior knowledge about the impinging signals' bandwidth is required for the algorithms to function. In this paper, we present a new technique for estimating the AoA and the bandwidth of the received broadband signals without requiring any knowledge of the bandwidth of the received signals. The proposed technique consists of...
This work presents a spiral antenna array, which can be used in the V- and W-Band. An array equipped with Dolph-Chebychev coefficients is investigated to address issues related to the low gain and side lobe level of the radiating structure. The challenges encountered in this achievement are to provide an antenna that is not only good matched but also presents an appreciable effective bandwidth at...
We designed a leaky wave antenna based on X-type composite right/left handed (CRLH) transmission line. Due to the wide-band nature of X-type CRLH transmission line, the antenna can provide a wide impedance bandwidth. The antenna can provide 5dB scanning pattern from 5.6GHz to 7.6GHz. The presented antenna shows a significantly low level of cross-polarized patterns using the balanced symmetric.
A new and circularly polarized (CP) antenna is proposed for global navigation satellite systems (GNSS) applications. The antenna employs a single feed and two orthogonally elliptical printed dipoles. The dipoles are crossed through a 90° phase delay line of a vacant-quarter printed ring to achieve CP radiation. In order to achieve broad beamwidth, four metallic cylinders are introduced. The proposed...
A four-layer square split-rings frequency selective surface is applied for designing a polarization converter. The new proposed polarizer operates in broadband, from 6.4 to 13.7GHz, which can generate circularly polarization waves from incident linearly ones at 45° title incidence to the structure. The new polarization converter is optimized and fabricated. Experimental results show that the polarizer...
In this paper, the dispersion properties of RLSA Bessel beam launchers, realized by enforcing both cylindrical standing wave and inward traveling wave aperture distributions, are compared. In particular, it is shown that such launchers can be profitably used for the generation of electromagnetic localized pulses at millimeter waves.
A broadband monopole is investigated. The bandwidth enhancement is achieved by loading a monopole with a dielectric resonator antenna (DRA) operating in a TM01δ mode to maintain a desirable omnidirectional radiation pattern. Preliminary results validate the design concept.
In this paper, the broadband concept in stacked patch antennas is applied to designing broadband rectangular dielectric resonator antennas (DRAs) with a small patch feed. Unlike the previous multi-segment DRA designs that have a DRA of a lower permittivity above one or more thin segments of higher permittivity, the top DR in this antenna has a higher permittivity than the lower segment. Theoretical...
Although conventional microstrip patch antennas have attractive features of easy fabrication and compatibility with MMICs, but they have a narrow bandwidth and large size in some of applications at low frequency bands [1]. In phased array applications, smaller antennas could be packed tightly to take advantages of lower angle scanning as well as reduction of mutual coupling [2]. Hand held communications...
Over the past years, dielectric resonator antenna (DRA) technology has received extensive attention. This is in view of some attractive features, which include no conductor loss, light weight and high radiation efficiency [1]. Some of the recent work focuses on enhancing the impedance bandwidth of a DRA by introducing parasitic elements, cascading resonators or shaping the DRA elements [2-9].
Properties of a novel broadband printed antenna element, printed counterpart of the conventional TV UHF panel antenna with very large bandwidth, has been studied. A design method and realization is presented in the paper. More than one octave measured bandwidth with VSWR less then 1.8 and directivity between 9.0 and 11.0 dBi has been achieved. Properties of the radiator as an array element have also...
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