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Whip antennas can provide good performance for RF communications, such as cellular telephony, especially when mounted on top of vehicles. Unfortunately, they are not easily integrated into a small handheld chassis. As handheld radios become smaller and more ergonomic, the whip antenna represents a growing inconvenience to the user. This paper describes one member of a new family of antennas under...
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...
The waveform of the electric field radiated by an antenna in a UWB system is usually a distorted form of the input pulse applied at the terminals. This distortion can be expressed in terms of the antenna impulse response in the time domain or directional transfer function in the frequency domain. Even for a simplest antenna like a linear dipole, the impulse response can be direction dependent. However,...
This work is based on employing the FET as an active element in the active monopole antenna. The obtained results show that, the FET can be used to highly reduce the antenna length for a wide band of frequencies. Among the different configurations examined the Gate-fed drain loop connection gives the best results.
A low-profile, broadband array antenna based on tightly coupled dipole array is presented. The array antenna does not need any external matching structure and equipment. The simulation results of the infinite proposed array show 3.37:1 bandwidth (1.97 GHz to 6.66 GHz) with VSWR < 2 at broadside radiation and above 95% radiation efficiency over the operating frequency band. The height of the array...
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...
It has been demonstrated that metamaterial-inspired electrically small antennas (ESAs) can be designed to have high radiation efficiencies and even large bandwidths with non-Foster circuit augmentations. However, being electrically small, it still remains a challenge to obtain directivities over interesting bandwidths which exceed those of simple dipoles, especially with only passive constructs. Different...
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 Full-duplex (FD) antenna system is presented with a high isolation between the TX and RX antennas. The isolation method is based on utilizing balanced antennas to localize the current on the ground plane and single mode excitation of the ground plane with capacitive coupling elements. The simulation results show a promising isolation level of 75 dB. User impact investigation on the...
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...
This paper presents a triple band base-station antenna having high gain. The antenna consists of a number of planar patches and vertical shorted patches. The planar patch is made of U-shaped and E-shaped slots. The multi-frequency configuration of this antenna resonates at triple band frequencies of 2.17 GHz, 2.44GHz and 3.6 GHz as undersigned in Worldwide Interoperability for Microwave Access (Wi-MAX)...
We present a novel ultra-wideband (UWB) dual-linear polarized phased array designed for simultaneous transmit and receive (STAR) monostatic antenna systems. The dual-linear polarized array employs a tightly coupled dipole topology that achieves an UWB operation from 2GHz to 18GHz, viz 9∶1 bandwidth. Also, its port to port isolation is at least 45dB at broadside. The array consists of tightly coupled...
This paper presents the design of a planar Quasi-Yagi antenna capable of achieving high Front-to-Back ratio (i.e. FTBR > 34 dB), high gain (i.e. > 6.4 dBi) and relatively wide bandwidth (i.e. up to almost 1 GHz). This antenna is designed to cover the 2.45 GHz ISM band. The overall dimensions of the antenna are 69 × 64 × 1.575 mm3. The antenna is made up of 5 director elements, 1 driven dipole...
A wideband horizontally polarized (HP) omnidirectional antenna is presented. The tightly coupled array (TCA) mechanism is ultilized into the design of the antenna to realize reduced lower cut-off frequency and improved bandwidth. The −10dB impedance bandwidth is 102.6% from 4.8GHz to 14.7GHz. Meanwhile, uniform omnidirectional radiation patterns with a gain variation of less than 3dB are obtained...
This paper presents a novel circularly polarized (CP) printed antenna with wide bandwidth and wide axial ratio (AR) beamwidth. The presented antenna is realized by bending a linearly polarized dipole into “S” shape with variable line width, which achieves circularly polarized radiation. Key parameters in designing such an “S” antenna are discussed and studied. It is found that this “S” antenna has...
This paper proposes an Ultra Wideband Microstrip Patch Antenna for Wireless Capsule Endoscopy. An approximate model of the human gastrointestinal environment is designed with CST Microwave Studio, and the antenna is placed in the center. The antenna is small and bent in a fashion so that it can easily be accommodated inside a capsule. Ultra Wideband technology facilitates higher data rate, resulting...
This paper includes design and implementation result of an adaptive beam forming antenna for upcoming 5G and Internet of Things (IoT). Switched parasitic array antennas are low cost, small sized and compact circular array antennas that steer beam in a desired direction by variation in switching pattern of parasitic elements. The proposed antenna design has an active center element, which is surrounded...
The paper presents a novel uniplanar integrated filtering dipole with a second-order filtering response of enhanced frequency selectivity. The first stage of the filter is a U-shaped half-wavelength resonator, whereas the second one is the planar dipole antenna. The bandwidth of the dipole is controlled by the edge coupling between the two stages. The U-shape resonator also acts as a balun. A truncated...
The proposed dipole antenna consists of the elliptical shaped driver, a tapered ground and a CPW-fed to a CPS transition. The proposed antenna offers a decreased an electrical size, and improved input impedance match than a conventional dipole antenna. Measurement results show a good operating impedance bandwidth and a radiation pattern.
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