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In this paper, a broadband circularly polarized Fabry-Perot resonator antenna with simple array thinning technique is proposed. The proposed antenna consists of a single layer partially reflective surface formed by ring FSS and a four sequential rotated sparse primary radiators backed with ground. A prototype antenna operating at 10GHz is designed. Simulation results show that a common frequency bandwidth...
A new feed to excite a cylindrical dielectric resonator antenna (CDRA) with HEM12δ mode has been conceived and demonstrated in this paper for the first time. This uses an aperture-fed dielectric resonator as a feed to a CDRA and results in much improved bandwidth along with attractive radiation characteristics. As much as 7.6 dBi peak gain has been documented. This investigation adds a new feeding...
By introducing a meander T-shaped feeding strip, a planar LTE/WWAN monopole antenna with eight-band operation is proposed for 4G tablet computers. The impedance bandwidths across dual operating bands approach 297 / 1323 MHz at the LTE / WWAN bands, respectively. The proposed planar monopole antenna has the antenna size of only 375 mm3. The measured peak gains and antenna efficiencies are approximately...
This paper introduces several emerging reconfigurable antenna elements for modern broadband wireless communication systems. Firstly, we will present a broadband uni-directional circular polarization (CP) reconfigurable antenna consisting of four planar monopole radiators and an broadband output phase reconfigurable feeding network. Switchable left-handed circular polarization (LHCP) and right-handed...
The paper presents a compact coplanar waveguide (CPW)-fed ultra-wideband (UWB) printed antenna with a dual band rejection. Implemented with developed fractal structures-based Koch shape, the proposed antenna uses a complementary split ring resonator (CSRR) etched into a single layer to obtain the dual band-notched function. Also integrated with a new feeding method, four different antenna designs...
In this paper, a low-cost dual-band printed antenna that employs Sierpinski fractal geometry is proposed for possible integration to IEEE 802.11n WLAN standards access points. The designed antenna covers two wireless spectrum bandwidth, they are the ISM 2.4 GHz and the U-NII 5 GHZ. The antenna geometry is confined within a compact size of 75 × 75 × 1.8 mm3. The antenna is mounted on partial ground...
A single element ultrawide band (UWB) polarization diversity antenna with dual orthogonal CPW feed is presented. The proposed structure consists of a printed circular radiator which is orthogonally feed with two CPW feed line to achieve polarization diversity characteristic. The proposed antenna utilizes a set of slanted microstrip-lines between the CPW feed lines to maintain high isolation (of more...
An equivalent circuit model of a quadraxial feed for ultra-wide bandwidth quadruple-ridged flared horn (QRFH) antennas is presented. The circuit is synthesised by only 3 unknowns and achieves an accurate input impedance for a wide range of dimensions. This model allows fast synthesis of optimal feeding designs that would ensure the excitation of the fundamental mode at the input of a QRFH.
A broadband dual-polarized antenna with Γ-shaped feeding structures is presented. The antenna achieves an impedance bandwidth of 76.7% for SWR<2 at both ports. The radiation pattern is very stable, the antenna gain is greater than 8.6dBi and the isolation between two input ports is better than 21dB over the operating frequency band.
A wideband dual-polarized antenna excited by T-shaped microstrip feedline for Long Term Evolution (LTE) communication system is presented. The VSWR less than 1.5, isolation between the two input ports more than 30dB, gain more than 9 dBi, and stable radiation patterns, low cross-polarization ratio, low backlobe radiation are obtained in the entire operating frequency band from 1.7 to 2.7 GHz.
In this paper, we propose a broadband true-timedelay reflectarray antenna composed of a low-profile planar MEFSS-based reflectarray fed with a horn antenna. The proposed reflectarray exploits the unit cells of ground-plane-backed miniaturized-element frequency selective surfaces (MEFSS) as its spatial time delay units (TDU) to operate in a true-time-delay (TTD) fashion and to reduce chromatic aberrations...
A novel compact printed antenna using asymmetric coplanar strip (ACS) feed is proposed for ultra-wideband (UWB) applications. With the ACS-fed structure and the opening in the radiating patch, the antenna is miniaturized to a size as small as 15 × 19 mm2. The antenna has an impedance bandwidth of 3.1 to 11.35 GHz and stable H-plane omnidirectional radiation patterns. The simple uniplanar structure...
In this paper, a grounded coplanar waveguide (GCPW) feed technique is proposed for gain control of a substrate integrated waveguide (SIW) horn antenna at 60 GHz. The controlling gain is obtained by using the NIP diodes (MA4FCP305). The return loss and antenna gain studies were performed using (HFSS) simulator. Simulated results showed an enhancement of the gain and bandwidth of the proposed antenna.
In many HF communication applications, the antennas are mounted on vehicular platforms. Due to the large wavelengths, the platform in these applications is part of the antenna. However, most HF antennas are not designed to take advantage of the presence of the platform. In this paper, we report the results of a study in which we investigate how the performance of a platform-mounted antenna can be...
This paper presents the design and parametric study of a tunable dual band square slot antenna with stub for DSC, ISM, and WiMAX applications. This dual band antenna has an ability to be tuned to any of the mentioned bands, according to the required applications, depending on the length of square side and the stub. The overall size of the designed antenna is 50mm × 50mm. The antenna has been etched...
This paper presents a novel broadband thin lens antenna applied to circularly-polarized applications. The lens is composed of four identical novel conducting surfaces sandwiching three identical dielectric layers. The novel design is able to generate transmission phases of over 300° in two orthogonal directions separately, which can be applied to design lens antennas for applications of single, dual...
In this paper, the characteristics of Reflectarray Antennas printed on convex curved surfaces are analyzed. In particular, results on the radiation performances of different Reflectarrays designed to be mounted on cylinders with different radii of curvature are presented and discussed.
In this paper a newly designed metasurface (MS) loaded miniaturized antenna is proposed and simulated. The double layered MS loaded with complementary split ring resonators (CSRRs) acts as the ground plane for a planar feeding monopole antenna. The antenna has a compact footprint of 0.11λ02 and a thickness of 0.07 λ0. The simulation results show that a wide −10 dB S11 bandwidth of 9% is realized....
in this paper, two different methods are introduced to radiate a wideband signal through an electrically small antenna. One method shifts the resonant frequency of the antenna and radiates a frequency modulated signal while the other presents a feeding mechanism to radiate an amplitude modulated signal. Both methods are categorized under antenna direct modulation and take advantage of transient properties...
Based on a pair of stubs and a coupled-line section, an out-of-phase phase shifter for wide-band application is proposed in this paper. The typical electrical parameters and numerical verifications are presented. This proposed 180-degree phase shifter features single-layer PCB fabrication with complete ground, wide phase-shifting bandwidth, wide impedance-matching bandwidth, and a simple circuit structure.
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