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In this paper, the integration of a flexible RFID tag with an inkjet-printed Single Walled Carbon Nanotube (SWCNT) film in a chipless sensor node for toxic gas detection was introduced for the first time. The whole module is realized on a "green" low-cost paper substrate. Carbon nanotube composites change their electric properties (e.g. resistance, dielectric properties) in the presence...
In this study, we propose a very simple and easy-to-fabricate transition from a low loss ground coplanar waveguide (GCPW) with sidewalls to rectangular waveguide. It consists of two steps of transition, one from an ordinary CPW to GCPW with side walls, and the other from GCPW to rectangular waveguide. Since the design is very simple and the features are aligned with the Cartesian coordinates, it highly...
A new concept of coplanar waveguide (CPW) exciting of mm-wave slot antenna has been presented. The antenna feeding is ensured by the coupling from the coplanar line to the slot radiating element via an inductively excitation located within the ground plane to which the coplanar line is connected. Simulated results show good performances in terms of bandwidth and gain at 60 GHz. Through the adjustment...
A planar lambda/8-PIFA with a coupling feed for achieving GSM850/900/1800/ 1900/UMTS operation in the mobile phone has been proposed and studied. With penta-band operation obtained for WWAN communication, the proposed lambda/8-PIFA occupies a small area of 7 times 40 mm2 on an inexpensive 1.6-mm thick FR4 substrate. The compact size of the proposed PIFA also makes it promising to be embedded inside...
An ultra-wideband (UWB) bow-tie antenna integrated with a balun was fabricated for breast cancer detection. The bandwidth and the center frequency of the antenna were 2.4 GHz and 4 GHz, respectively. A target which was located at the depth of 44 mm in a dielectric material was detected by confocal algorism.
The lateral radiation millimeter-wave antenna using post-wall waveguide was proposed and the two type of prototype antenna was estimated. As a result, the measured directivity and gain of prototype antenna agree with the simulated data using simply-modeled HFSS reasonably. It was confirmed that the proposed antenna characteristics was able to estimate by simple model simulation. And the feasibility...
The wireless interconnection has attracted much attention recently as an alternative to the conventional wired interconnection in the ultra large scale integration (ULSI) technology. In this paper, a wireless interconnection operating at 25 GHz, which utilizes novel antenna in the form of a tapered slot structure, is described. The design takes into account an environment similar to the one used in...
A vertically folded dipole on a multi-layer circuit board is proposed. The two radiation arms are spread into two dielectric surfaces and connected through vias. It effectively reduces antenna area by half without decreasing the bandwidth. It also facilitates meandering the strip dipole and further reduces the antenna length. Examples are given to characterize the vertical two or three folded dipoles...
This paper investigates the performance of the single slot ring element for Ka-band reflectarray designs. Using the element rotation technique, two Ka-band circularly polarized reflectarray prototypes are designed and implemented, with different thicknesses of the substrate. The bandwidth is significantly enhanced when a thick substrate is used.
An RFID-based chemical sensor is being developed for detecting biological warfare agents (BWA). When interrogated with a reader, the sensor responds with a positive or a negative reading. Future versions of the sensor will also identify the type of agent present. The chemical sensor comes with its own packaging, is glued to the substrate and interfaces with the RFID chip via a circuit. The antenna...
A design for a new quasi-Yagi antenna suitable for fabrication on low-cost, low dielectric constant materials such as LCP was developed by replacing the half-wavelength dipole driver element with a folded dipole. The input impedance of the folded dipole quasi-Yagi antenna and its resonance frequency may be tuned by properly adjusting the parameters of the folded dipole giving more freedom for optimization...
An internal PIFA/slot antenna for quad-band mobile handset applications is presented. The quad-band operation for the bar-type mobile handset is obtained by the resonant modes of the slot antenna in conjunction with those of the PIFA. The proposed antenna has a compact size of 42 times 10 times 4 mm3. The quad-band operation includes GSM850 (824-894 MHz), GSM900 (880-960 MHz), DCS1800 (1710-1880 MHz),...
A compact and planar dual-antenna structure is reported which combines a printed monopole and a half-slot antenna to provide dual polarization. Different excited current modes are utilized to obtain low mutual coupling between elements. A prototype is fabricated and the measured results are presented. Relative bandwidth of 23.5% and isolation of better than 23 dB are achieved.
In this paper, the authors have obtained the transmission losses by measuring microstrip lines and post-wall waveguides of different lengths and estimated the loss per unit length. These losses have been analytically derived by different closed formulas and compared with the measured values. The effective conductivity and complex permittivity by WG mode resonator method have been quantitatively confirmed...
The miniaturization of electronics systems requires smaller antennas. Therefore a very good characterization of the antennas is needed. One of the available techniques to minimize the antenna size is the use of ceramic materials with very high permittivity. One of the advantages of ceramic materials over other dielectric materials is the possibility of fabricating compact and easy to build several...
In this paper, the one-sided directional slot dipole antenna with for 5 GHz-band application have been designed and experimentally verified. The antenna size is 22 mm times 29 mm, which is smaller than a patch antenna at the same frequency. The measured radiation patterns are in the good agreement with the simulation which shows the effectiveness of the presented technique to realize on-sided directional...
In this paper, the effects of parameters of substrate and ILH-MSA structure on radiation performances have been analyzed firstly, and then the available ranges of the parameters are given to ensure radiation performances of ILH-MSA. Secondly, an ILH-MSA operating at 1.6GHz is designed and fabricated as an example. Experiment results show that, the area of the present ILH-MSA is 49% of that of traditional...
This study shows that, at the present state of development, one-bit frequency doubling tags seems to be feasible exploiting green technologies. The optimal process will exploit a paper substrate where both antennas and pentacene organic diodes could be deposited by means of ink-jet printing. The proposed frequency doubling tag has a fully uniplanar layout (no vias needed), whereas the use of simple...
In this paper, a very low loss CPW structure for application in submillimeter wave region is proposed and an optimized solution in terms of loss and dispersion is obtained. In this new structure, substrate is removed totally, which allows a pure TEM wave propagation. Furthermore, using the side walls in the structure, there are no higher order substrate mode excitations. The only remaining source...
In this paper, a novel antenna having a miniaturized aperture is proposed. The substrate including a split-ring resonator (SRR) array has been inserted into a size-reduced open-ended waveguide. For a low return loss and high radiation efficiency, the ring arrangement has been optimized, and a stepped transition using H-plane discontinuity is proposed. The proposed antenna achieves a 70% aperture reduction...
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