A Novel Small Sierpenski Antennas

In This paper, new small antenna is described and it is designed to be used in RFID applications at microwave frequencies. This structure represents a new version of sierpenski antenna. The reduction of size by more than 75% gives this patch a great inters.  Two equivalent resonant models are presented based on a model of triangular and sierpenski patch antennas.DOI:http://dx.doi.org/10.11591/ijece.v3i4.258

A Modified Fractal Bow Tie Antenna for an RFID Reader

In this paper, fractal Bowtie antennas are proposed. To validate our structure and to develop an analytic method to determine the geometry parameters, the Lumped theory is used. The proposed structure is simulated using CST Microwave Studio and then Compared to the electrical Model. The proposed circuit has the same resonant aspect when comparing to the Bowtie antenna with a much reduced simulation time. The Bowtie antenna has a box with a size of   44 *80 *1.5 mm3. This antenna will be designed to an RFID Reader that resonates on 2.45 GHz.DOI:http://dx.doi.org/10.11591/ijece.v4i3.565

A Circuit Model to an Encoche Coplanar Antenna for a Radio Frequency Identification TAG

In this paper, Miniature Encoche Coplanar antennas are proposed. Tovalidate our structure and to develop an analytic method to determine thegeometry parameters, the Lumped theory is used. The proposed structure issimulated using ADS and then Compared to the electrical Model. Theproposed circuit has the same resonant aspect when comparing to theEncoche antenna with a much reduced simulation time. The compactcoplanar antenna has a box with a size of 36*52*0.2 mm3. This antenna willbe designed to an RFID TAG that resonates on 2.45 GHz.DOI:http://dx.doi.org/10.11591/ijece.v3i3.257

Multiband Antennas Design Techniques for 5G Networks: Present and Future Research Directions

With the development of wireless communication system has demanded compact wireless devices that allow more space to integrate the other electronics components. Advancement in technology creates challenges in implementing antenna for multiple RF band with a wide range of frequencies. With the advancement of optimization technique we can improve the antenna design as well as provide us the motivation of analyzing the existing studies in order to categorize and synthesize them in a meaningful manner. The objective of this paper contributes in two ways. First, it provides the research and development trends and novel approaches in design of multiband MIMO, smart reconfigurable and defected ground structure (DGS) antenna techniques for wireless system. Secondly, it highlights unique design issue reported in literature. The proposed paper aim is filling the gap in the literature and providing the researcher a useful reference

Compact Multiband Planar Fractal Cantor Antenna for Wireless Applications: An Approach

A compact multiband fractal antenna which is a new criterion in communication is proposed. The optimized prototype measures 35 mm × 31 mm × 1.6 mm. The proposed antenna covers WLAN IEEE 802.11b, 802.15, PCS, GSM lower and higher bands, DCS, IMT, UMTS, Wi-Fi, and WLAN wireless applications. The proposed antenna exhibits multiband characteristics with an S11 of −30.69 dB at design frequency and it is found that ~70% of the S11 graph below −10 dB reference is achieved. Experimental S11 has been compared with the one which is obtained using method of moments. The aim of implementing self-affine fractal concept in antenna design makes it flexible in controlling the resonance and bandwidth. This paper investigates self-affine fractal geometry to miniaturize and to resonate multiband frequencies. The prototype model with a good agreement of S11 is reported

Design and development of triangular, spiral, and fractal antennas for radio frequency identification tags

This dissertation reports on the design and development of three compact, non-meandered microstrip patch antennas for ultra high frequency (UHF) radio frequency identification (RFID) applications. The monopole antennas considered in this work are an inset-fed triangular antenna, one arm Archimedes spiral antenna and a Half-Sierpinski fractal antenna. These antennas with small length to width ratios (\u3c 2/1), can be the preferred choice, in the tagging of small size consumer end products, over the ubiquitous meandered dipole antenna (length/width \u3e 5/1), which is often the antenna of choice, due to its high gain for UHF RFID applications. The lengths and widths of all three antennas are less than 5.5 cm. Earlier reports of planar antennas for RFID applications in the UHF range have lengths larger than 9 cm on one side or are developed on a rigid substrate. All three antennas have a surface area of about 30 cm2 and are designed for a flexible polyimide substrate. The new antennas satisfy the requirement of a voltage standing wave ratio (VSWR) \u3c 2 and exhibit a gain close to or greater than 0 dBi at the operation frequency of 915 MHz. All three antennas have a return-loss less than -10 dB at 915 MHz and a -10 dB bandwidth greater than 12 MHz. While the triangular and spiral antennas display peak gains of over 2 dBi, the fractal antenna has a gain close to 0 dBi (-0.64 dBi). The effect of ground geometry on the radiation performance of the antennas has been analyzed using ANSOFT Designer software. Slots, aligned to the top patch were introduced in the antenna ground plane to increase the gain of the antennas. The fabricated and tested antennas were then employed in the transmission-delay-line-based passive radio-frequency identification tag. The location of the antenna with respect to the transmission line on the tag was found to affect the radiation pattern of the antenna. A circular disc monopole antenna having a gain of 8.88 dBi and having a -10 dB bandwidth greater than 300 MHz was employed to transmit and receive the interrogating and back-scattered signals, respectively. The generation of bits, employing On-Off Keying (OOK) modulation technique was successfully demonstrated. The tag, fabricated with the triangular antenna is found to perform the best