A novel flexible low-profile double-notch reconfigurable UWB antenna design
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Reconfigurable antenna
A frequency-reconfigurable microstrip patch switchable to slot antenna is proposed. The antenna is capable of frequency switching at nine different frequency bands between 1.98 and 3.59 GHz. The patch is resonating at 3.59 GHz, while the slot produces eight different operating frequencies between 1.98 and 3.41 GHz. Five RF p-i-n diode switches are positioned in the slot to achieve frequency reconfigurability. Simulated and measured results are used to demonstrate the performance of the antenna. The simulated and measured return losses, together with the radiation patterns, are presented.
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In this paper, a pattern reconfigurable water antenna is demonstrated for IoT (Internet of Things) applications. A wireless system including the water antenna and LoRa (Long Range) transceivers is set up. The sensitivity measurements of four different scenarios are carried out. The link budget of each scenario is calculated and the performance is evaluated. The results show that the water antenna works well as a transmitter antenna in the system. This work successfully demonstrates the potentials of water antennas in IoT applications.
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A new concept antenna, reconfigurable antenna, is introduced in this paper. Firstly qualitative analyses on the principle of microstrip reconfigurable antennas are done using microstrip antenna cavity theory. Then properties of some microstrip reconfigurable antennas are simulated using the finite difference time domain (FDTD) method. The results indicate that rectangle microstrip reconfigurable antennas can have good reconfigurability when the side lengths are greater than or equal to one operating wavelength.
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A reconfigurable microstrip antenna with polarization diversities is presented in this paper. The reconfigurable antenna's structure consists of a circular patch embedded by two slots with four PIN diodes mounted on them. The reconfigurable polarization property of the proposed antenna is achieved by switching "ON/OFF" states of these diodes. Both HFSS simulation and experimental testing are carried out to characterize the antenna's performance. The investigation results show that this antenna has good reconfigurable characteristic between circular polarization (CP) and linear polarization (LP), which may have many potential applications in modern wireless communication systems.
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In recent time, world have seen a rapid growth in wireless communication. Development in antenna from single band to dual band and multi band had made the antenna system more compact. A frequency reconfigurable microstrip antenna using a PIN diode for multiband operation is using many application and hot research area. In this paper, reconfigurable microstrip patch antennas and their types like frequency, polarization, radiation pattern and gain are described.
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A four by four pixelated microstrip patch antenna is reconfigured in three frequencies using RF MEMS switches. The proposed antenna can be integrated within a physical structure under the CLAS concept which can replace bolt-on antennas. Structural testing of the antenna clearly demonstrates the structural robustness of this CLAS reconfigurable antenna.
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This paper proposes a machine learning (ML) based compact microstrip patch frequency reconfigurable antenna for multiple frequency band application. The antenna consists of four metalized patches symmetrically arranged and coupled via slots and metallic bars, respectively. Variations in the material, geometry, and bias parameters of the microstrip patch antenna, along with the R, L, and C values of the equivalent circuits of the varactor diode, add frequency reconfigurability. Frequency reconfigurability is predicted using the artificial neural network (ANN) surrogate model for multiple frequency bands of 0.5 GHz – 7.5 GHz with very high accuracy and time efficient manner as compared to full-wave electromagnetic simulations solvers such as high-frequency structure simulator (HFSS) or CST microwave studio (MWS).
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A novel reconfigurable microstrip-fed patch antenna with polarization agility in either of two bands is proposed in this communication. Frequency reconfigurability is achieved by connecting an additional small patch to the main patch through a p-i-n diode. Each corner is cutoff from the main patch through a narrow L-shaped cut to get polarization reconfigurability. In addition, the impedance and axial ratio bandwidths are enhanced by using the proximity-coupled feed. Both prototypes are designed, fabricated, and tested. The measured results agree well with the simulated results in all cases. Also, the proposed microstrip-fed antenna is tested at high RF input power. The proposed structures are simple, low profile, low cost, and have simple bias circuitry. The proposed antennas are capable of operating in three polarization states, i.e., left-hand circular polarization, linear polarization, and right-hand circular polarization in two frequency bands. The proposed structures are best suited for modern advanced wireless communication systems such as LTE and 5G.
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An optically controlled frequency reconfigurable microstrip patch antenna is presented in this paper. S11 measurements show that greater than 85% power is transmitted at each of the three resonant frequencies. Measured radiation patterns for patch antennas using ideal switch states agree with HFSS simulations.
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