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A method for widening bandwidth of a planar slot antenna is proposed. This method only requires a short strip in a rectangular aperture of slot antenna. By using this uncomplicated method, we achieved relative bandwidth up to 55.5% for |S11|≤0.5(VSWR≤3). Additionally, the gain of the antenna shows stability for frequency in the bandwidth. These results indicate that a short strip generate a second...
The proposed antenna structure with modified ground plane that fully covers Bluetooth and Wireless Fidelity (Wi-Fi) applications. In order to enhance the efficiency, a resonator which consists of a closed loop of a ground plane and lumped inductor (L) are proposed. The closed loop is connected to the ground plane with open-end extension by lumped inductor for easy control. This antenna designed on...
A simple wave-traps multi-input multi-output (MIMO) antenna design is presented for wireless local area network (WLAN) operation. The measured −10 dB bandwidths for return loss are covering the WLAN2.4 and Wlan5.2/5.8 bands. The antenna structure is uncomplicated; it's composition by two symmetrically antennas and places on the clear-area which is at upper substrate. The proposed MIMO antenna system...
A Linear polarization reconfigurable magneto-electric dipole antenna is presented. Antenna reconfigurability is achieved by using a novel cross-dipole feed with four bent arms and four PIN diodes. By controlling the states of the diodes, the antenna operation can be switched between two orthogonal linear polarizations. Superior antenna performance such as wide operating bandwidth, stable gain and...
A novel slot antenna is proposed for mobile phone applications. The antenna has two slots named Slotl and Slot2, respectively. Slot1 has a hybrid shape of the combination of a circle and a rectangle with four steps located at the lower edge of the rectangle. Slot2 is of rectangular shape. The two slots are opened at opposite edges of the system board. The antenna is fed with a folded shaped 50 Ω microstrip...
Future communication systems will utilize multiple antennas and beamforming to a larger extent than what has been done before. Design and evaluation of systems with many antennas and large bandwidth requires channel models with good accuracy in angle and delay. An angular resolution down to one degree, and bandwidths of several GHz, are foreseen for the future 5G wireless systems. For this purpose,...
The next generation (5G) mobile communication system has been the focus of studies recently. One of the approaches to enable this system is utilizing the high-SHF band (over 6 GHz) and the EHF band (mainly 30–100 GHz). To design radio links with high accuracy and evaluate 5G system performances for various scenarios, channel characteristics must be clarified. In this paper, we clarify the channel...
A novel triple-band three-port diversity dipole antenna for LTE access points is presented. The impedance bandwidths, determined from RL > 10 dB, can reach about 120 / 872 MHz (17.1 / 33.9 %) for the 700 / 2300 / 2500 MHz operating bands, respectively, which are covering the required bandwidth for LTE system. This proposed triple-band dipole array also provides maximum peak antenna gains and efficiencies...
In this paper a circular polarized textile antenna at 2.45GHz is designed and simulated. The antenna used the fleece material as the substrate with permittivity of 1.3 and loss tangent of 0.024 with a thickness of 1 mm. The circular polarized (CP) antenna is achieved by using an inverted z slot asymmetrical structure at the center of radiating element. When the z slot is incorporated onto the square...
This paper presented a practical electromagnetic absorber design with periodic cells based on the well-known Salisbury screens. The unit cell has a size of 20cm × 20cm (7λ at the resonance frequency, 11 GHz) and a thickness of 20μm conductive ink. The return loss at the resonance frequency is up to 34 dB, which has a 3.5 GHz in bandwidth at the threshold of 10 dB. The frequency bandwidth is achieved...
A compact multiband planar antenna is proposed for LTE/GSM/UMTS/WLAN/WiMAX mobile handsets. The multiband antenna is designed based on a composite right/left handed (CRLH) structure and a slot structure. The impedance bandwidths achieved are 120% (0.67–2.74 GHz) for LTE700/GSM850/900/1800/1900/UMTS/WLAN2450/LTE2300/ 2500 bands, 20% (3.15–3.84 GHz) for WiMAX3500 band, and 27% (4.9–6.4 GHz) for WLAN5200/5800...
A novel circularly polarized (CP) circular antenna for UHF RFID system is proposed and experimentally studied. By embedding a four-leaf clover slot into the circular patch fed by the L-shaped microstrip line, the proposed CP design can easily be achieved with the impedance bandwidth (RL L 10 dB) of about 99 MHz (11.0% @ 925 MHz) and the 3 dB axial-ratio (AR) bandwidth of about 60 MHz (7 % @ 925 MHz)...
Reflectarrays and transmitarrays are extremely important in the applications of terahertz (THz) technologies, as they feature merits like high gain and low cost. In this work, a reflectarray and a transmitarray are designed at 300GHz. A 32 × 50 offset-fed wideband reflectarray antenna, based on single-layer elements with a large and linear phase response, shows a fixed beam direction without frequency...
We propose a spherical ultra-wideband antenna based on the self-complementary structure. The antenna employs a loop comprising of two symmetric teardrop shaped arms conformally printed on a three-dimensional sphere. To enhance the impedance matching bandwidth, the capacitive and inductive loading techniques are applied by broadening the antenna's front part and adding shorting strips at the rear part,...
In this paper, a dual-orthogonal polarized Vivaldi antenna with high port isolation is presented. The dual-polarized antenna structure is achieved by inserting two orthogonal Vivaldi antennas in a cross-shaped form without a galvanic contact. To satisfy the low-end bandwidth requirements and improve the radiation characteristics in the lower frequencies, a novel exponential tapered slot edge (ETSE)...
A stub-loaded wideband dual-polarized antenna is proposed, which is composed of two orthogonal cross loop dipoles, branch-shaped coupling feed line and a box-shaped reflector. The stub inside the loop dipoles are adopted to enhance the impedance bandwidth. A new resonate mode is induced in the higher frequency by using the stub. Therefore, the impedance bandwidth is greatly expanded. Design, simulated...
In this paper, a high gain yagi-uda Origami antenna is introduced. Antenna is realized on a paper substrate by using origami tetrahedron structure. The radiating aperture comprises a triangular shaped monopole and two strip directors. The proposed antenna is verified by simulation and measurement results. The fabricated antenna demonstrates a peak gain of 9.6dBi at 2.6 GHz with impedance bandwidth...
For the first time, real-time 2-Dimensional localization and velocity measurements using simultaneous 4×4 transmit and receive antenna configuration with an OFDM Radar implemented on commercially available Software Defined Radios (SDR) are presented. The Radar setup uses 100MHz bandwidth at 4.05 GHz to achieve a range resolution of 1.5 m, and the integration time of 11.8 ms to obtain a velocity resolution...
Low cost, high-resolution and wideband millimeter wave receiver systems attain more and more attention for commercial and military applications. We present a broadband receiver module operating in the W-band for radar and imaging applications. Its compact packaging compared to traditional split block technique is realized using printed circuit board technology and a high density polyethylene lens...
Artificial Magnetic Conductors (AMCs) design and characterization in the UHF band is a big challenge while realizing low-profile antenna. In fact, AMCs unit cell often balance large geometries with high dielectric constants to achieve the desired frequency target while maintaining a minimal thickness. A compact AMC unit cell achieving a 37% reduction in the largest dimension (or 60% of surface reduction)...
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