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frequency reconfigurable antenna for Portable Wireless Applications

Computers, Materials & Continua 2021年第9期68卷 3015-3027页

作者： Shakir Ullah Sadiq Ullah Inzamam Ahmad Wasi Ur Rehman Khan Toufeeq Ahmad Usman Habib Mahmoud A.Albreem Mohammed H.Alsharif Peerapong Uthansakul Department of Telecommunication Engineering University of Engineering and TechnologyMardanKPPakistan School of Computer Science and Electronic Engineering Bangor UniversityBangorLL572DGUnited Kingdom Department of Electronics and Communications Engineering A’Sharqiyah UniversityIbra400Oman Department of Electrical Engineering College of Electronics and Information EngineeringSejong UniversitySeoul05006Korea School of Telecommunication Engineering Suranaree University of TechnologyNakhon RatchasimaThailand

In this paper,the design and experimental evaluation of a hexagonalshaped coplanar waveguide(CPW)-feed frequency reconfigurable antenna is presented using flame retardant(FR)-4 substrate with size of 37×35×1.6 *** antenna is made tunable to three different modes through the status of two pin diodes to operate in four distinct frequency bands,i.e.,2.45 GHz wireless fidelity(Wi-Fi)in MODE 1,3.3 GHz(5G sub-6 GHz band)in MODE 2,2.1 GHz(3G Long Term Evolution(LTE)-advanced)and 3.50 GHz Worldwide Interoperability for Microwave Access(WiMAX)in MODE *** optimization through simulation modeling shows that the proposed antenna can provide adequate gain(1.44∼2.2 dB),sufficient bandwidth(200∼920 MHz)and high radiation efficiency(80%∼95%)in the four resonating frequency *** standing wave ratio(VSWR)frequency bands operation,the proposed antenna can support portable devices for handheld 5G and Wireless LAN(WLAN)applications.

关键词： LTE WiMAX coplanar waveguide frequency reconfigurable antenna

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RF MEMS Based reconfigurable Rectangular Slotted Self Similar antenna

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Circuits and Systems 2016年第6期7卷 859-876页

作者： S. Anand J. Josephine Pon Gloria Department of Electronics and Communication Engineering Mepco Schlenk Engineering College Sivakasi India

Wireless communication systems which require flexibility and reconfigurability in antenna systems faces main problems like antenna performance, size, weight and cost. A wide band frequency reconfigurable Rectangular Slotted Self Similar antenna has been proposed in this paper. The rectangular slotted patch is repeated for two iterations at different scales and is separated by means of Radio frequency Micro Electro Mechanical Systems (RF MEMS) switches in order to provide reconfigurability. The antenna can operate in three frequency bandsi.e. K-band, Ku-band and Ka-band by altering the states of RF MEMS switches. To avoid fringing effects and to improve antenna performance, quarter wavelength (λ/4) spacing is required between the antenna and the ground plane. However, a reconfigurable antenna requires different λ/4 spacing which is difficult to achieve using a common ground plane. So the frequency reconfigurable antenna is integrated with high impedance surface (HIS) like Electronic Band Gap (EBG) structures to suppress standing waves and surface waves with a unified profile thickness of 1.75 mm. The overall dimension of the proposed antenna along with RF MEMS Switch, feed element and HIS is about 8 mm × 8 mm × 1.75 mm. The simulated results of the proposed antenna reveal enhancement in antennas performance like Voltage Standing Wave Ratio (VSWR), Front to Back Ratio (FBR) and bandwidth when it is placed over HIS EBG. Also the radiation patterns of the proposed antenna when placed over EBG shows the suppression of side lobe and backward radiation.

关键词： frequency reconfigurable antenna Radio frequency Micro Electro Mechanical Systems High Impedance Structure Self Similar Structures

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