Reconfigurable Polarization Slot Antenna

  1. A simple polarization and beam switching reconfigurable antenna is presented in this paper. The circular patch with annular slot is used as the radiating element.The circular metallic conductor positioned below the substrate with the air dielectric acts as the ground plane for the antenna.
  2. Polarization-Reconfigurable Antenna,' IEEE Antennas and Wireless Propagation Letters, vol. 1557-1560, 2017. Wong, 'Wideband Circular-Polarization Reconfigurable Antenna With L-Shaped Feeding Probes,' IEEE Antennas and Wireless Propagation Letters, vol. 2114-2117, 2017.

A novel reconfigurable slot antenna architecture allowing polarization switching is presented. The antenna shape consists of a slot-ring with perturbations which are switched on and off using pin. A polarization reconfigurable slot antenna is proposed in this paper. The antenna consists of a microstrip line-to-slotline transition structure, two radiation slots and a switchable feeding network. The feeding network is a gradually changed ring slot with six switching diodes on it. By controlling the diodes states, the antenna can generate y-direction polarization, z-direction polarization.

Source

Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP)>402 - 404

Reconfigurable Polarization Slot Antenna Booster

Abstract

A polarization-reconfigurable slot antenna, for WLAN applications, is presented in this paper. The antenna incorporates a reconfigurable Wilkinson power divider-based feed network, which couples electromagnetic energy to a decagonal slot in the ground plane. The approach, presented herein, is based on electronically reconfiguring the phase difference, between the antenna's feeding ports, to achieve polarization diversity while the antenna is still operable over the desired frequency band. The proposed antenna is designed and simulated using Ansoft HFSS, a Finite-Element-Method based EM solver. The computed return loss, for each case, is better than 10 dB over the 2.4-2.484 GHz frequency range. A prototype of the designed antenna is fabricated and measured. An acceptable analogy between measured and simulated S11 plots is witnessed. For each switching condition, the radiation pattern, axial-ratio and peak gain of the antenna are included herein.

Identifiers

book ISBN : 978-1-4577-0250-1
book e-ISBN : 978-88-8202-074-3 , 978-88-8202-074-3

Authors

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Ramadan, A.

  • ECE Dept., American Univ. of Beirut, Beirut, Lebanon

Al-Husseini, M.

  • ECE Dept., American Univ. of Beirut, Beirut, Lebanon

Kabalan, K.Y.

  • ECE Dept., American Univ. of Beirut, Beirut, Lebanon

El-Hajj, A.

  • ECE Dept., American Univ. of Beirut, Beirut, Lebanon

Keywords

wireless LANantenna feedsantenna radiation patternselectromagnetic wave polarisationfinite element analysispower dividersslot antennasfrequency 2.4 GHz to 2.484 GHzpolarization reconfigurable slot antennaWLAN applicationreconfigurable Wilkinson power divider-based feed networkelectromagnetic energydecagonal slotground planephase differenceantenna feeding portpolarization diversityfrequency bandAnsoft HFSSfinite-element-methodEM solverreturn lossantenna designswitching conditionradiation patternaxial-ratiopeak gainDirective antennasMicrostrip antennasSwitches

wireless LANantenna feedsantenna radiation patternselectromagnetic wave polarisationfinite element analysispower dividersslot antennasfrequency 2.4 GHz to 2.484 GHzpolarization reconfigurable slot antennaWLAN applicationreconfigurable Wilkinson power divider-based feed networkelectromagnetic energydecagonal slotground planephase differenceantenna feeding portpolarization diversityfrequency bandAnsoft HFSSfinite-element-methodEM solverreturn lossantenna designswitching conditionradiation patternaxial-ratiopeak gainDirective antennasMicrostrip antennasSwitches

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Polarization Reconfigurable U-slot Patch Antenna

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Reconfigurability is a vital feature of future agile millimeter wave systems for sensing, imaging, wireless, and satellite communications. Reconfigurable antennas are an integral part of such systems as they can control polarization, frequency, radiation pattern, or characteristic impedance.

Paraffin-Based Reconfigurable Components at Millimeter Wave

Figure 1: Multiphysiscs simulation results for Von Mises stress and temperature distribution of the paraffin PCM actuator for input voltage of 2 V.

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The main goal of this project is to design low-loss millimeter wave (mmW) RF components using novel materials such as paraffin. Alkane or paraffin is an organic phase change material (PCM) that exhibits low a dielectric loss, (tan⁡δ=6.6E-4 at 110 GHz), with a relative dielectric constant of 2.26. Paraffin is also a mechanical PCM that undergoes a 15% volumetric change through its solid-liquid phase change.

Due to its unique electrical and mechanical properties, paraffin PCM variable capacitors are very attractive for designing reconfigurable antennas and distributed loaded line phase shifters at mmW band.

Figure 2: Micrograph of the fabricated reconfigurable antenna.

In our group, we have developed a continuously reconfigurable antenna at 100 GHz by monolithically integrating the paraffin PCM capacitors with a slot antenna. Designed antenna has a reconfiguration range of 96–102.2 GHz with a maximum gain of 3 dBi. (Figures 1—2)

In addition, we have also developed a distributed loaded line phase shifter based on a new class of electro-thermally actuated RF MEMS devices using paraffin PCM. Designed phase shifter has a figure-of merit of 71.8°/dB achieved while maintaining a return loss more than 12 dB.

Figure 3: Multiphysiscs simulation results for Von Mises stress and temperature distribution of the paraffin PCM actuator for input voltage of 5 V. Designed phase shifter has a maximum insertion loss of 5 dB for a 360° of phase shift. (Figure 3)

© Prof. Nima Ghalichechian's Group

Related Papers

B. Ghassemiparvin and N. Ghalichechian, “Reconfigurable Millimeter-wave Antennas using Paraffin Phase Change Materials,” European Conference on Antennas and Propagation (EuCAP), Davos, Switzerland, 10-15 Apr, 2016. DOI:https://doi.org/10.1109/EuCAP.2016.7481595 (Download PDF)

B. Ghassemiparvin and N. Ghalichechian, “Novel Paraffin-Based 100-GHz Variable Capacitors for Reconfigurable Antennas,' European Conference on Antennas and Propogation (EuCAP), Paris, France, 19-24 Mar, 2017.DOI:https://doi.org/10.23919/EuCAP.2017.7928379(Download PDF)

B. Ghassemiparvin and N. Ghalichechian, 'W-Band True-Time Delay Phase Shifters Using Paraffin Microactuators,' European Conference on Antennas and Propogation (EuCAP), London, UK, 9-13 Apr, 2018.