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In this study, a microstrip-fed ultra-wideband (UWB) antenna with a simple architecture that operates at a frequency range of 3.1–11 GHz is presented. Due to compact and low profile, this type of antenna has an important role in growing applications of commercial and industry. Acceptable return loss level, good radiation pattern characteristics and relatively good gain flatness have been reported...
The technique of short-circuiting posts, loaded disk and ground plane transformation are adopted in the antenna design. The effects of key parameters on impedance matching are analyzed in detail. The simulated and measured results show that the proposed antenna can work in a wide band. The relative bandwidth with S11 ≤ −10dB reaches 47.1%, covering from 4.7GHz to 7.6GHz. The radiation pattern is similar...
In order to cover a wide frequency band and meet the demand of multi-band, a microstrip antenna with some MEMS switches was designed by using the reconfigurable technology and fractal technology. Four MEMS switches were symmetrically loaded in the microstrip antenna. By controlling the states of the switches, the surface current distribution will be changed and then the operating frequency will be...
A reconfigurable fractal-shaped slot-ring antenna with wide bandwidth is presented. The antenna is able to switch between two modes using 8 PIN diode switches. In the first mode, the proposed antenna operates at S band with 70% fractional bandwidth (FBW). In the second mode of operation, the antenna covers C band with 67% FBW. Fractal shapes are incorporated into the antenna structure to significantly...
A wideband slot antenna and its MIMO application is presented. Both of them have a very simple structure. The single antenna merely consists of a T-shaped slot while the MIMO antenna has two T-shaped slots and two slits, which are used to improve port-to-port isolation. Simulated results show that the single antenna achieves an 83.3% impedance bandwidth with |S11|<-10 dB from 1.4 to 3.4 GHz and...
In this paper, preliminary results of an array of resonant cavity antennas (RCAs) to operate at 60 GHz are presented. Each RCA in the array has a two-layers all-dielectric superstructure with permittivity variation in axial direction. The single RCA element exhibits a peak directivity of 16.6 dBi and its 3dB directivity bandwidth covers the entire unlicensed 60 GHz band from 59 GHz to 67 GHz. The...
Novel circular polarization (CP) antenna using microstrip line and eccentric annular ring slot is presented. To form the CP radiation, a circular patch is loaded in the slot. Specific parameters of the added circular patch can independently control CP performance or CP center frequency, making a CP antenna with certain frequency specification and CP performance can be easily designed. Fabrication...
In this article, the ability of a single layer printed modified folded asymmetric dipole antenna, which is composed of two asymmetric radiated loops (there are slotted ground-trace in each loop) and asymmetric feeding structure, to operate at three wide frequency bands (2300∼2690MHz, 3000∼3600MHz and 4900∼6000MHz) to cover WLAN and LTE operation has been demonstrated. A prototype of the proposed antenna...
We present a substrate integrated waveguide (SIW) cavity-backed slot antenna with 34% bandwidth at X-band. Dual differential feeding with a phase offset of 90° is employed to achieve circular polarization, resulting in an excellent isolation. The antenna achieves wide-band circularly polarized radiation with symmetric patterns in both principal planes, with average gain of 5.7 dB and simulated radiation...
A planar ultra-wideband (UWB) antenna with quad notched bands is proposed and its performance is investigated in this paper. The designed UWB antenna consists of a rectangle-shaped radiating patch with tapers and a polygon ground plane with a rectangular slot. A rake-shaped resonator (RSR) and a pair of L-shaped slots (LSSs) are employed to achieve the desired four notched bands which are operated...
A novel compact printed antenna fed by CPW with WLAN band rejection for UWB applications is proposed in this paper. This symmetrical antenna features three parts: a semicircular stub as the UWB radiator, a pair of modified compact patches which are integrated smoothly as the ground plane with the line-to-arc transition structures, and two U-shaped slots which are embedded on the ground plane to reject...
The ultra-wideband (UWB) antennas are required to cover high impedance bandwidth such that the return loss (RL) is greater than 10 dB with improved gain and radiation efficiency which are required for the different applications. In this UWB range (3.1–10.6 GHz), there are other applications, using narrow band frequency bands, such as WiMAX (3.3–3.7) GHz, WLAN (5.15–5.825) GHz and others. In this case...
A novel slot-coupled barbel antenna is designed and analyzed. A sensitivity analysis performed in order to improve the bandwidth, while the center frequency is kept constant.
This paper provides a ground plane solution for the fractal-shaped reconfigurable dual-band slot-ring antenna by using the Electromagnetic Band-Gap (EBG) surfaces. The EBG surface is designed with an in-phase bandwidth from 1.7 to 3.0 GHz. A distance between the EBG and the antenna is selected to be 7. 5 mm. The EBG-backed reconfigurable slot-ring antenna operates at two frequency bands based on the...
This paper presents a compact multi band CPW-fed monopole antenna using L-shaped and straight slots. The designed antenna consists of CPW-Fed structure and radiating rectangular patch. The triple band antenna characteristic (2.5, 3.5 and 5.5 GHz) is realized by split L shaped and straight slots on antenna patch. The proposed antenna is fabricated on single metallic side of FR4, which operates triple...
A design of dual-band cavity-backed slot antenna is presented for GPS and S-band radar applications. In the design, a very thin cavity (0.017 λ0 in thickness at 1.575 GHz) is used to achieve unidirectional radiation. The dual-band responses of the antenna are excited by the slot resonance at 1.575 GHz and waveguide transition effect at 2.4 GHz. Even with very small cavity thickness, reasonable impedance...
In this study, cylindrical array of stripline fed rounded bow-tie slot antennas is designed to be used for avionics applications. The array element is fed by a T shaped strip line. Shape of the slot is modified from rectangular to rounded bow-tie to provide sufficient bandwidth for telemetry application. Furthermore, vias are placed around slots to prevent unwanted parallel plate modes of stripline...
Antennas formed by a single cylinder with a longitudinal slot are presented. It has been shown that the antennas allow flush installation and can be efficiently used either as a single radiating element or as an element in antenna arrays. Physical phenomena that were utilized to produce uniform field distribution along the slot and as the consequence, to create optimal directivity, have been studied.
A microstrip-line fed annular-ring slot antenna with circularly polarized (CP) radiation is initially studied. To achieve harmonic suppression for this antenna, the technique of loading a defected ground structure into the ring slot is proposed. Measured and simulated results show that the proposed antenna can achieve broad CP bandwidth of 9.7% (2.26–2.49 GHz), while good harmonics suppression from...
A high-Q 3-D filter/antenna integration is presented herein. The filter/antenna is composed of a surface gap ring resonator and a cavity-backed slot antenna, where the slot antenna has a narrower bandwidth than the filter causing it to behave as a resonator and contribute a pole to the filtering function. The filter/antenna operates at a center frequency of 3.75 GHz with a fractional bandwidth of...
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