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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...
As social network sites rise in popularity, the youth spends large amounts of their time browsing the Internet and interacting via social network sites. Furthermore, social network sites creates opportunities that allow the youth to connect to different learning environments and thus opens up options for new dimensions to learn. This gives rise to research on a shift from conversational to education...
Variations of Coplanar Waveguide fed elliptical patch microstrip antennas with elliptical slot ground plane in 4000 MHz frequency band is proposed. The first variation of elliptical shaped microstrip antenna yields impedance bandwidth of more than 117% that covers Wi-MAX and WLAN bands. Further another variation in which elliptical patch and elliptical slot ground plane rotated by 900 is proposed...
This paper reports on the impact of antenna impedance frequency characteristics on a broadband low-NEP operation of THz MOSFET direct detectors. New Si-lens integrated high-impedance on-chip ring antennas were developed based on a systematic co-design procedure with MOSFET device. They allowed achieving the world record values both in terms of responsivity and noise equivalent power for detector arrays...
A printed cross dipole antenna with parasitic ring resonators is proposed. The proposed antenna achieves both a broadband axial ratio and broadband impedance bandwidths. It consists of cross dipole with 90° phase delay line. This results in having one minimum axial ratio point due to the sequential arms rotation. In addition to that, the parasitic rings produce the other minimum axial ratio point...
Design of simple circularly polarized microstrip antenna(CPMSA) is proposed. Circular polarization has been obtained by truncating the diagonal corners of the MSA. Bandwidth is enhanced by increasing the substrate height. Inserted slots further enhanced the AR BW.Center frequency of CPMSA is 2.438GHz. VSWR bandwidth of 120 MHz & axial ratio bandwidth of 71.64MHz which is approximately 2.5 times...
A printed dipole antenna with broad band is proposed for modern wireless communication systems, which sufficiently covers the DCS, PCS, TD-SCDMA (A + B + C), and WLAN bands. The antenna has two tapered arms fed by an integrated balun, leading to a broad impedance bandwidth. Moreover, triangular-shaped grounds are designed for the antenna, which improves the impedance bandwidth effectively. A prototype...
A small broadband patch antenna for RFID tags is proposed in this paper. Using inset-feed technique together with two asymmetrical slots embedded from two non-radiation edges deep into the center of the square patch, two resonances with similar radiation characteristics can be excited. It thus increases the bandwidth of the antenna. The two slots can also reduce the size of the patch, and the inset...
For wideband antennas with unidirectional patterns, it is a troublesome problem to stabilize the antenna patterns across a very large frequency band. In our work, cavity-backed structures are utilized with bowtie exciters. The patterns of the proposed cavity-backed triangular bowtie antenna (TBA) with rounded corners can be stabilized within a 92% frequency band without side lobes, by placing a circular...
This paper has presented a design of a sleeve monopole antenna fed by a microstrip line. Experimental results show that the impedance bandwidth of the proposed antenna can significantly be improved by selecting suitable sleeve length and spacing. A very small variation in the impedance bandwidth is observed when the ground-plane length varies with a great range. The proposed antenna is very suitable...
This paper presents a broadband omnidirectional vertically polarized antenna of only a one eighth wavelength associated to the lowest frequency. This antenna is composed of a conical monopole with metallic parasitic elements, a capacitive disk and a dielectric substrate placed above a square ground plane. This structure provides broadband performances and omnidirectional radiation patterns over the...
This paper considers an UWB balun optimized for a frequency band from 6 to 8.5 GHz. The balun provides a transition from unbalanced coplanar waveguide (CPW) to balanced coplanar stripline (CPS), which is suitable for feeding broadband coplanar antennas such as Vivaldi or bow-tie antennas. It is shown, that applying a solid ground plane under the CPS-to-CPS transition enables decreasing its area by...
Microstrip Antennas (MSAs) consist of a metallic radiating patch on one side of thin dielectric substrate and other side is ground plane. Most important advantages of MSAs are low profile, light weight and compatibility with integrated circuit technology. MSAs are used in mobile communication, satellite communication, radar, direct broadcasting, global positioning systems and remote sensing. The major...
The major limitations of microstrip antennas (MSAs) are their narrow impedance bandwidth, small gain and low power handling capability. A half U-slot MSA with shorting wall has been designed and experimentally verified. Its center frequency is observed at 2.66 GHz. The bandwidth is 688 MHz and percentage bandwidth is 25.6% has been obtained while radiation efficiency is above 94% for the operating...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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