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Over the past 10 years or so, many broadband and ultra-wideband antennas have been developed for broadband high data rate mobile communications. It is realized how to make efficient and accurate measurements for such antennas could be a challenging issue. In this paper, we examine the antenna efficiency measurement techniques which have been used up to now, and identify their advantages and disadvantages...
In this paper, we will discuss the design and development of a miniaturized dual UHF band antenna, resonating on the RFID bands. The antenna resonates on 433 MHz and on the European RFID band (865 MHz-868 MHz). This antenna design is an updated version of the miniaturized 433 MHz antenna model, with an improved performance and dual band characteristic. This type of planar antenna can be used in different...
Wideband antennas are essential for military systems requiring spectrum-agility or multi-functionality. High-gain radar or communication systems require wideband, potentially multi-octave, radiation patterns and VSWR, sometimes with wide angle scanning. Aperture size is constrained by the dimensions of the host platform (e.g. aircraft or naval ship). Low gain mobile communication systems require wideband...
In this paper, a novel wideband leaky wave antenna using a composite right-/left-handed transmission line for UHF band are proposed. The antenna is composed of a ladder network less than one wavelength. Transmission and radiation characteristics of the leaky wave antenna are measured. The fabricated leaky wave antenna has flat gain characteristics from 400 MHz to 700 MHz.
In order to meet the miniaturization of portable communication equipment, researchers have given much attention recently to compact microstrip antennas. Conventional microstrip antennas in general have a conducting patch printed on a grounded microwave substrate, and have the attractive features of low profiles, light weight, easy fabrication, and conformability to mounting hosts. However, microstrip...
This paper presents an antenna that operates over a frequency range of 2.4 GHz to 10.6 GHz, such that the antenna handles both LAN and UWB frequencies. This antenna, designated as the PaSP antenna, is composed of two patches, where one is fed and the other is short-circuited to the ground plane. The design of this antenna is performed using four steps. The frequency response of the VSWR for each step...
The paper describes the method to broaden the bandwidth of circular polarized patch antennas in different forms, including single patch antenna, double-layer patch antenna and antenna array.
In this paper, a printed loaded monopole antenna with a low profile is proposed for car DVB-T antenna applications. By loading a resistor and using lumped LC components for impedance matching, the proposed antenna achieves a DVB-T bandwidth of gains better than -6 dBi, covering the frequency range from 470 to 862 MHz, and with a stable omni-directional radiation.
Next generation wideband and ultra-wideband radar antenna arrays need efficient true-time delay networks for array control. Following the great interest for optical control of antenna array beam steering, performance analysis of optical beam-formers is a must. In this paper signal to noise ratio and dynamic range of simple optical beam-forming structures with components off the shelf are investigated...
A slotted microstrip patch antenna is designed with Electromagnetic Band gap (EBG) structures. The performance parameters of the presented antenna are then compared with the conventional patch antenna. It is realized that there is a significant increase of bandwidth and better suppression of harmonics than the normal patch antenna. This antenna is thus operating in the frequency band 5 - 6 GHz which...
Patch antennas fed by meandering or M-probes have the advantage of low cross polarization, compared to the case of feeding by L-probes. In this paper, the general method of using U-slots to design dual/triple band patch antennas is applied to M-probe fed patch antennas. Several of these antennas have been fabricated and measured. Simulation results using Zeland IE3D software agree well with measured...
This paper introduces a concept of concatenating miniaturized antenna elements to realize wideband arrays. When such arrays are placed conformally, the resulting equivalent circuit (corresponding to each antenna element) is identical to that employed in modeling left-handed transmission lines. Overall, the array emulates propagation within anisotropic media. Such anisotropy introduces added degrees...
Nowadays antennas operated in V-band receive more and more attention as communication technology develops. Progress in material engineering opens a wide window for high frequency applications. In this paper, a broadband folded dipole antenna array is first presented, which has a magnitude of S11 lower than -10 dB over the range between 48 GHz and 64 GHz, an efficiency of 90 percent and a gain of 10...
Antenna is one of the key factors in RFID systems. The performance of the reader / tag antennas shows significant effect on the reading range and detection accuracy of an RFID system. Since RFID systems operate at frequencies varying from low frequency (LF) to microwave frequencies (MWF), the RFID antenna designs are with distinct requirements. In this paper, we address the antenna design considerations...
In this paper a novel slot-coupling feeding technique is used to feed a circularly polarized patch antenna. The antenna is fed through two microstrip lines which are excited 90?? out-of-phase and coupled to a square patch by means of a square ring slot realized in the feeding network ground plane. Design procedure and simulation results are shown for a 2??2 array working in the WiMax 3.3-3.8 GHz frequency...
An antenna concept for FM radio reception in mobile phones is proposed and evaluated. By resonating a loop or monopole radiator with a shunt element and connecting the antenna to a high-impedance low noise amplifier, an equivalent antenna efficiency of -24??3 dB is achieved over the entire band of 88 - 108 MHz despite having high-Q gain characteristics and without using control voltages for frequency...
A wideband four-port integrated antenna that is capable of exciting four different radiation patterns is presented. The antenna designated as the magneto-electric multipole consists of four dual-polarized magneto-electric dipoles arranged in a 2 by 2 array configuration above a ground plane. A two layer matching network is used to combine the signals from the four dual-polarized dipoles to produce...
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