PIFA Design Research Articles

A Novel PIFA Design for SAR Reduction in 5G Networks to Analyze the RF Shield Ιmpact

A Novel PIFA Design for SAR Reduction in 5G Networks to Analyze the RF Shield Ιmpact

CPW-Fed Conformal PIFA Design for Implantable IoMT Devices With Wideband Performance

CPW-Fed Conformal PIFA Design for Implantable IoMT Devices With Wideband Performance

Frequency Tunable PIFA Design Based on Meander Line Elements

Bu çalışmada, WLAN ve WiMAX uygulamaları için elektriksel olarak frekansı ayarlanabilir yeni bir düzlemsel evrilmiş-F anten (DEFA) tasarımı önerilmektedir. 30 × 25 × 10 mm3 boyutlarındaki antenin ana radyatörü simetrik olmayan kıvrımlı şerit elemanlarından oluşmakta ve frekans cevabı bu elemanlar arasında optimum konumda kullanılan bir PIN diyotu aracılığıyla dinamik olarak ayarlanabilmektedir. Sayısal tasarımı Ansoft-HFSS ve CST Microwave Studio benzetim yazılımları aracılığıyla gerçekleştirilen antenin prototip üretimi de gerçeklenerek, diyotun açık/kapalı durumları için geri dönüş kaybı ölçümleri alınmıştır. Önerilen anten diyotun kesim durumunda WiMAX bandında tek bent rezonans gösterirken, iletim durumunda 2.4 ve 5.2 GHz WLAN bantlarında rezonansa gelmektedir. Ayrıca E ve H-düzlemleri için ilgili frekans bantlarında oldukça düzgün ışıma karakteristikleri sergileyen antenin mutlak kazanç değerleri 2-4 dBi arasındadır.

Compact and Wideband PIFA Design for Wireless Body Area Sensor Networks

The specific advantage of fractal geometry to realize compact antenna features is exploited in this work for the design of a miniaturized Planar Inverted-F Antenna configuration with a large bandwidth. The conventional quadrilateral radiating element of a Planar Inverted-F Antenna is replaced by a Minkowski pre-fractal-based shape, thus increasing the resonant wavelength without affecting the overall antenna dimensions. Consequently, with the new design, a physically smaller antenna can achieve the same resonant frequency of a larger conventional configuration. Measured as well as simulated reflection coefficient and radiation patterns are presented to validate the assumptions. The impedance bandwidth of the antenna (2.19 to 2.52 GHz) covers the ISM band with a boresight gain of 1.5–2 dB over the entire band. Furthermore, to demonstrate the miniaturization effect, a successful comparison is provided with an identically sized, conventional square Planar Inverted-F Antenna design. The proposed antenna design can be usefully adopted for power-efficient communications in the framework of Wireless Body Area Sensor Networks.

Dual element MIMO planar inverted-F antenna for 5G millimeter wave application

This work presents a 28 GHz Dual Element Multiple Input Multiple Output (MIMO) Planar Inverted-F Antenna for millimeter wave 5G mobile terminal. The antenna design employs PIFA design concept as it is a common antenna type use for mobile phone as it provides wide bandwidth and good performance. The antenna design begins with a characterization of the single element PIFA design and then extended to Dual Element MIMO PIFA design. The single element PIFA design is enhanced to MIMO design by extending the ground plane and locate the second PIFA at the other end. Isolation between the antenna elements of the MIMO PIFA is analyzed by varying the gap distance between the antenna elements. The result for Envelope Correlation Coefficient, Diversity Gain and Multiplexing Efficiency is also presented. The simulation computed using Computer Simulation Technology (CST) Microwave Studio software.

Design of Frequency Reconfigurable PIFA Antenna With Floating Ground Plane

Objectives: The rapid evolution of wireless communications systems open the field to frequencncy reconfigurable antenna. In this paper, we propose to study and design a PIFA antenna with frequency agility characteristic. Methods/Analysis: The reference antenna resonate at F = 1000 MHz. It consist of a PIFA design printed on the top side and the grounded PCB in the back one. To obtain a low profile and have a multiband behavior, a floating ground plane was printed in back side of the antenna coupled with the radiating PIFA element. A two resonances frequencies can be obtained. To electronically reconfigure the antenna in a determined band and acquiring a large tuning range, a varactor diode was embedded in the corner of the radiating element. Findings: When adding a floating ground plane, a two resonances frequencies can be obtained at 920 and 2800 MHz with better than -10 dB impedance match. To obtain three resonance frequencies with wide tuning ranges, we apply a reverse voltage V on the varactor diode. Frequencies can be shifted from 650 to 2457 MHz covenring GSM850/1900/UMTS/LTE700/LTE2300 and ISM band. The reference and the active antennas were designed and described. Good agreement between simulations and measurement results. Application/Improvements: This work show that tunable PIFA antenna are promising candidate for handheld portable. Keywords: Floating Ground Plane, Frequency Agility, Large Tuning Range, PIFA, Reconfigurable Antenna, Varactor Diode

Investigation into Low SAR PIFA Antenna and Design a Very Low SAR U-slot Antenna using Frequency Selective Surface for cell-phones and Wearable Applications

There are very important questions. “Do Electromagnetic waves have irreparable effects on human or not?” “Are there any relation between cancer and waves?” and finally “what should we do to be safe?”. In the present article, these questions will be answered simply and professionally. First of all, Specific Absorption rate (SAR) is define then L-Slot and U-slot antenna is designed and simulated using cell-phones and wearable applications, operating at and consist of GSM900 and GSM1800. Standard frequency band width for the first and second band is and for uplink and downlink and in the present research these numbers are obtained. The SAR of each antenna is measured and is compared with each other. Thanks to design of antenna, The SAR of U-Slot antenna is very low and it is almost stimulated and this sentence means this antenna is anti-cancer. Finally, Some SRR unit-cells are designed and when they are used in structure, SAR will be more decrease. Last SAR value is and for each bands .In the last table, There are some comparison between different creditable references and present article SAR reduction is acceptable and it is near to percentage.

Dual-Element PIFA Design with Dual Shorting Pins for Multiband Communication Devices

A low profile multiband resonant, dual-element array antenna is proposed for use in handheld communication devices. The proposed antenna comprises two dual shorting pin planar inverted-F antennas and a folded ground plane which operates as a perfect electric conductor case. The feeding scheme adopted for the proposed design produces a fixed phase difference between two antenna elements of the design to achieve an ultrawide bandwidth and a flexible radiation pattern. The proposed antenna design is simulated with commercially available software, which is based on the finite element method. The resonant frequency bands covered are GSM850/900, DCS1800, PCS1900, UMTS2100, and LTE2300/2600 MHz. Details of the design considerations for the proposed antenna are described and the simulated and measured results are presented and discussed, which are in agreement.

A Passive Auto-Switching Amphibian Antenna

An amphibian antenna was constructed that is capable of radiating both above and below the surface of water. The antenna is effectively a dual band PIFA design where each radiating element is tuned to resonate in close proximity of either air or water. A tuning stub was switched into circuit by the use of a passive, water filled, capacitive microstrip switch. The antenna was designed to operate at 433 MHz and good input impedance was observed in both simulation and measurement for both environments.

Multishorting Pins PIFA Design for Multiband Communications

A novel PIFA model with multiple shorting pins is proposed for multiband, low profile wireless applications, which has the ability to work in adverse conditions. The proposed model has a planar radiating sheet, a ground plane, and sides covered with PEC boundaries. The substrate inside theantenna boxis tempered in order to improve the bandwidth and gain. The enhancements applied to the proposed PIFA model show improved characteristics for this PIFA model and make it a versatile candidate for handheld, low profile, and multiband resonant communication devices. Pertinent communication devices are those that work with GSM 850/900, UMTS 850/900/1700/1900/2100, LTE 2300/2500, and ISM 2400 bands used for Bluetooth and WLAN.

Compact size planar folded pifa design for mobile handset

A printed compact size folded inverted-F antenna with simple configuration for mobile handset operating within the global system for mobile communication/personal communication system/digital communication system bands is initially proposed.To additionally cover the wireless local-area network frequency spectrum at 2.4 GHz, a narrow stub is protruded from the printed shorting wall. The excitation of these operating bands with desirable bandwidth is achieved by feeding a 50-Ω microstrip line to the folded radiating element through a via hole. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1045–1050, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25919

Erratum: Dual and triple‐band PIFA design for WLAN applications

AbstractOriginally published Microwave Opt Technol Lett 49: 2159–2162, 2007. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3192, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22885