Saida Ibnyaich

Development of Wideband Planar Inverted-F Antennas for Wireless Application

Problem statement: Due to the rapid development in wireless communication, the antennas capable of broad-band operations are very demanding in cellular communications systems. Among various possible antennas, planar inverted-F antennas (PIFAs) have the advantages of low profile and compact size and are very suitable for present-day wireless communication application. Approach: This study demonstrates a very effective method of bandwidth enhancement for planar inverted-F antenna. It was done by optimizing the width of feed plate and shorting plate, then by adding a parasitic element. Results: The obtained results of our developed wideband antenna was an impedance bandwidth of 72.8% for S11<-10 dB from 1.74-3.54 GHz which could cover GPS, DCS, IMT-2000, 2.4GHz WLAN, 3.5 GHz WIMAX applications. Conclusion: As the antenna was successfully researched and well optimized, and desired results were achieved.

Effects of changing dimensions on the planar inverted-F antenna performances

With the rapid growth of the wireless mobile communication technology, the future technologies need a very small antenna with a good performance, the advantage of planar inverted-F antenna (PIFA) make them very popular in many applications requiring a low profile antenna. This letter is aimed at addressing this problem by investigating the effects of changing the dimensions of each parameter of the planar inverted-F antenna on the impedance bandwidth, resonance frequency and gain. It is shown that a PIFA with a good performance can be achieved by optimizing the dimensions of the radiating plate, the ground plane and the height of the antenna.

Multiband Operation and Performance Enhancement of the PIFA Antenna by Using Particle Swarm Optimization and Overlapping Method

Recently, the demand for wireless devices that support multiband frequency has increased. The integration of such technology in mobile communication system has led to a great demand in developing small size antenna with multiband operation, which is able to operate in the required system. In this paper, a novel type planar inverted F antenna (PIFA) with gridded ground plane structure and overlapping cells is presented. By controlling the overlapping size, we improve the characteristics of the proposed antenna. This antenna is developed to achieve multiband operation with small size and good performance. The particle swarm optimization (PSO) is employed to a PIFA antenna to get rid of the limitations of single band operation by searching the optimal localization and length of linear slots on the ground plane to give triband operation. This PIFA antenna can be integrated to operate for several mobile applications as Bluetooth/WLAN, WIMAX, and 4G (UMTS2100, LTE). The optimized antenna is simulated by both Ansoft HFSS and computer simulation technology microwave studio (CSTMWS) in terms of -parameters. A good agreement between simulated performances by both software types is achieved. A parametric study is made to analyze the effect of different PIFA parameters on the operating frequency and the reflection coefficient in order to enhance the antenna performances. In these frequency bands, the antenna has nearly omnidirectional radiation pattern.

Broadband triple-band CPW-fed patch antenna for WLAN/WiMAX operations

A triple-frequency patch antenna with coplanar waveguide (CPW)-fed structure is presented in this paper for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The proposed antenna mainly consists by three radiating elements: Stub1, Stub2 and Stub3 with a defected ground plane for band broadening. By adjusting the lengths of the three Stubs, three resonant frequencies can be achieved and adjusted separately. The simulated 10 dB bandwidth for return loss is from 2.07 to 2.73 GHz, 2.89 to 4.35 GHz and 4.6 to 7.06 GHz, covering all the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands. Furthermore, the patch antenna has a simple planar structure and occupies a small size of about 20×37 mm2; including the finite ground CPW feeding mechanism. Good dipole-like radiation characteristics over the operating bands are obtained.

A compact triple-band patch antenna for WLAN/WiMAX applications

A novel triple frequency patch antenna for WLAN/WiMAX applications is proposed and investigated in this paper. The antenna proposed is composed of three radiating elements: Stub1, Stub2 and Stub3. By adjusting the lengths of the three Stubs, three resonant frequencies can be achieved and adjusted separately. We present a microstrip patch antenna for worldwide interoperability for microwave access (WiMAX) standard at 3.5/5.5 GHz bands and wireless local area network (WLAN) operates at 2.4/5.2 GHz bands. This design results in a reduction in size and weight and allows integration in hand-held devices. Furthermore, nearly omnidirectional radiation patterns, reflection coefficient and gain over the operating bands have been obtained.

Modeling of Human Head Interaction with Planar Antenna for Multi Standard Cellular Phones

Many wireless communication devices are used with their antennas in close proximity of the human head. This fact changes the antenna characteristics and affects the communications performance on one hand, and causes the deposition of microwave energy in the users head, on the other hand. The amount of power absorbed by the human body is limited to a given maximum value, according to the two standards IEEEC95.1 and EN 50360. In this paper the design of a multiband compact antenna for integration into the multifunction mobile phones is presented. The specific absorption rate SAR of the planar antenna is calculated.

Design of a miniaturized Microstrip Patch Antenna for a passive UHF RFID tag

This paper present a design and miniaturization of rectangular patch antenna with balanced feed. The miniaturized patch antenna for a passive radio frequency identification (RFID) tag witch can operate in the ultra-high frequency (UHF), the resonant frequency is 915MHz. The simulation was performed in High Frequency Structure Simulator Software (HFSS). The miniaturized antenna has an acceptable results in terms of efficiency, size, return loss (S11), and Input Impedance.

Compact triband CPW-fed F-shaped monopole antenna with inverted L-slot for 2.1-GHz/WLAN/WiMAX applications

A novel coplanar waveguide (CPW)-fed F-shaped monopole antenna with inverted L-slot for 2.1-GHz band, Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) applications is proposed and investigated in this paper. The proposed antenna is composed of a CPW-fed F-shaped planar monopole and an inverted-L slot, which occupies a compact size of 25 (W) × 40 (L) mm2 including the ground plane. By adjusting the dimensions of the monopole and slot, three desired resonant frequencies can be achieved and tuned independently. The antenna exhibits three resonances covering the 2.1-GHz band, 5.2/5.8 GHz WLAN bands and 3.5/5.5 GHz WiMAX bands. The parameters which affect the performance of the antenna in terms of its frequency domain characteristics are studied in this paper. Details of the antenna design and simulation results are presented and discussed.

A compact triple-frequency CPW-fed planar monopole antenna for PCS/WiMAX/WLAN applications

A triple-frequency compact monopole antenna with coplanar waveguide (CPW)-fed structure is presented in this paper for PCS 1900, WiMAX and WLAN applications. The proposed antenna, which consists of a rectangular radiation patch with L-shaped slot and an inverted L-shaped stub extending from the ground plane. By engraving an L-shaped slot on the rectangular radiation patch, the antenna can excite two resonant modes (WiMAX and WLAN). The third resonant mode is introduced by extending an inverted L-shaped stub from the ground plane (PCS 1900). The designed planar monopole antenna has a compact size of only 17×30×1 mm3 including the ground plane. The simulated -10dB impedance bandwidth at the first band (lower frequency, fr1=1.91 GHz) is about 180 MHz, for the second band (middle frequency, fr2=3.52 GHz) is about 650 MHz and at the third band (upper frequency, fr3=5.45 GHz) reaches about 1.45 GHz, which cover the PCS 1900 standards (from 1.85 to 1.99 GHz), the 3.5/5.5 GHz WiMAX standards and the IEEE 802.11a 5.2/5.8GHz WLAN standards, respectively. Furthermore, nearly omnidirectional radiation patterns, reflection coefficient and gain over the operating bands have been obtained.

A wide band modified PIFA antenna for WLAN/WiMAX & HIPERLAN/2 applications

This paper presents a compact planar inverted-F antenna (PIFA) designed to cover the bands of the existing wireless networks with standards such as Wireless Local Area Network (WLAN) in USA (5.15-5.35 GHz, 5.725-5.825 GHz), HIgh PERformance radio Local Area Network /2 (HIPERLAN/2) in Europe (5.15-5.35 GHz, 5.47-5.725 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) (5.25-5.85 GHz). The PIFA antenna provides a good reflection coefficient equal to -26.07 dB and a broad bandwidth of 690 MHz. The antenna is characterized with reflection S-parameter, surface current distributions, and radiation patterns.