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Journal ArticleDOI

A Pattern-Reconfigurable Dielectric Resonator Antenna Based on Switchable Directors

TL;DR: In this article , a pattern-reconfigurable dielectric resonator antenna (DRA) with compact structure and high efficiency is proposed by introducing a pair of switchable directors.
Abstract: A novel pattern-reconfigurable dielectric resonator antenna (DRA) with compact structure and high efficiency is proposed in this letter by introducing a pair of switchable directors. The switchable directors are arranged on both sides of an omnidirectional DRA, which operates in the TE01δ mode. Their directing function can be controlled by switching the on/off status of the p-i-n diodes so that one omnidirectional radiation pattern and two unidirectional endfire patterns are provided in the azimuthal plane. To verify this idea, a prototype of the proposed antenna is fabricated and measured. Good agreement between the simulated and measured results can be observed. The peak gain in endfire status reaches 4.5 dBi and the front-to-back ratio is more than 12 dB. Meanwhile, the gain variation of the omnidirectional pattern in the azimuth plane is less than 2 dB, which shows good omnidirectional radiation performance.
Citations
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Journal ArticleDOI
TL;DR: In this paper , a polarization-reconfigurable liquid dielectric resonator antenna is introduced, which uses gravity-controlled ethyl acetate as the reconfigurable variable, which can adapt to the attitude of the equipment and realize the independent switching between linear polarization.
Abstract: A polarization-reconfigurable liquid dielectric resonator antenna is introduced in this letter. The antenna uses gravity-controlled ethyl acetate as the reconfigurable variable, which can adapt to the attitude of the equipment and realize the independent switching between linear polarization, i.e., left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP), without an additional control circuit or mechanical structure, which greatly reduces the manufacturing cost. Under circular polarization, LHCP and RHCP have bandwidth utilization of 92.6% and 61.3%, respectively, and peak gain of 6.9 dBi and 7.2 dBi, respectively. The simulation results of the antenna prototype agree with the measured results. The antenna works in industrial scientific medical (ISM) band, which can be used in Wi-Fi intelligent equipment, vehicle satellite communication, and other scenes.

4 citations

DOI
TL;DR: In this article , a polarization-reconfigurable liquid dielectric resonator antenna is introduced, which uses gravity-controlled ethyl acetate as the reconfigurable variable, which can adapt to the attitude of the equipment and realize the independent switching between linear polarization.
Abstract: A polarization-reconfigurable liquid dielectric resonator antenna is introduced in this letter. The antenna uses gravity-controlled ethyl acetate as the reconfigurable variable, which can adapt to the attitude of the equipment and realize the independent switching between linear polarization, i.e., left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP), without an additional control circuit or mechanical structure, which greatly reduces the manufacturing cost. Under circular polarization, LHCP and RHCP have bandwidth utilization of 92.6% and 61.3%, respectively, and peak gain of 6.9 dBi and 7.2 dBi, respectively. The simulation results of the antenna prototype agree with the measured results. The antenna works in industrial scientific medical (ISM) band, which can be used in Wi-Fi intelligent equipment, vehicle satellite communication, and other scenes.

3 citations

Journal ArticleDOI
TL;DR: In this paper , a circularly polarized (CP) broadside antenna array with a continuously adjustable beam is proposed and implemented, where a reflection phase shifter with varactor diodes loaded on two output terminals of a branch directional coupler is realized.
Abstract: A circularly polarized (CP) broadside antenna array with a continuously adjustable beam is proposed and implemented. First, a reflection phase shifter with varactor diodes loaded on two output terminals of a branch directional coupler is realized. By controlling the voltage across both ends of the varactor diodes in the terminal load circuit, the reactance of the load is changed, allowing control of port phase shift. Following that, the microstrip patch antenna array is combined with the reflection phase shifter to achieve the pattern reconstruction for the array. For verification, a prototype of the designed pattern reconfigurable antenna (PRA) is fabricated and measured. The measurement results indicate that the beam direction of the antenna can be continuously adjusted with a change in the voltage across the varactor diodes. The maximum beam direction of the antenna reaches ±21° when the biggest DC bias voltage across the varactor diode is chosen as 15 V. Besides, the antenna shows good CP performance in different beam directions.

3 citations

Journal ArticleDOI
TL;DR: In this article , a circular microstrip patch antenna with three complementary split rings (CSRRs) on the ground plane for pattern agility features is presented, which can steer from ±15°, 180°, and 0° of the broadside pattern in the elevation plane with a satisfactory gain of 3 dBi.
Abstract: ABSTRACT This article presents a circular microstrip patch antenna loaded with three complementary split rings (CSRRs) on the ground plane for pattern agility features. The antenna resonated at 5.3 GHz and accommodated the frequency spectrum from 5.1–5.7 GHz for different CSRR combinations. The reconfigurable pattern feature has been produced with three p-i-n diode combinations integrated with the CSRR slot on the ground patch. The CSRR combinations are utilized to change the radiation phase concerning the primary radiating circular patch. The proposed antenna radiation beam can steer from ±15°, 180°, and 0° of the broadside pattern in the elevation plane with a satisfactory gain of 3 dBi. The phase variation for various CSRR combinations concerning the primary antenna is presented. The presented antenna is fabricated on an FR4 substrate and tested in an anechoic environment; the tested results verify the pattern agility of the antenna. The demonstrated antenna is suitable for modern wireless communications like LTE and Cognitive radios. The compact size, simple biasing, and low cost are added advantages of the antenna.

1 citations

DOI
TL;DR: In this paper , a pattern reconfigurable antenna with vertical polarization is proposed based on two folded near-coupled slot antennas, which achieves peak gain of 7.15 dBi and front-to-back (F/B) ratio of more than 22 dB at 5.7 GHz.
Abstract: A pattern reconfigurable antenna with vertical polarization is proposed based on two folded near-coupled slot antennas. To achieve two endfire beams and a bidirectional beam, respectively, a central feeding structure and a reconfigurable feeding strip are designed based on the current reverse principle with the help of p-i-n diodes. A prototype has been fabricated and measured to validate this design. Three high-quality radiation beams have been obtained. In the two endfire states, the measured peak gain can reach 7.15 dBi and the front-to-back (F/B) ratio is more than 22 dB at 5.7 GHz. In the bidirectional state, the measured peak gain can reach 3.94 dBi and the F/B ratio is less than 0.3 dB.
References
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Journal ArticleDOI
TL;DR: In this article, an annular cylindrical dielectric resonator antenna (DRA) with two-port diversity realized simultaneously omnidirectional horizontally and vertically polarized radiation patterns with low cross coupling was proposed.
Abstract: This letter proposes an annular cylindrical dielectric resonator antenna (DRA) with two-port diversity realizing simultaneously omnidirectional horizontally and vertically polarized radiation patterns with low cross coupling. The horizontally and vertically polarized radiation patterns are achieved by exciting the orthogonal TE01δ and TM01δ modes in a single cylindrical dielectric resonator (DR). Due to the high Q-factor of the TE01δ mode, an air gap and multiple feeding lines are introduced to increase the impedance bandwidth. The proposed antenna provides an impedance bandwidth of 19.1% in the vertically polarized mode and an overlapping bandwidth of 7.4% in the horizontally polarized mode, with the overlapping band ranging from 3.78 to 4.07 GHz. Antenna diversity and multiple-input-multiple-output (MIMO) performance are examined in terms of envelope correlation coefficient and mean effective gain.

129 citations

Journal ArticleDOI
TL;DR: This letter proposes a novel pattern-reconfigurable antenna that provides an efficient solution for wireless communications by reconfiguring parasitic striplines placed around a radiating dipole and reflecting metal pieces under the dipole using p-i-n diodes.
Abstract: Pattern-reconfigurable antennas with multiple switchable beams, especially with both boresight and endfire directions, are highly desired for wireless communications. In this letter, a novel pattern-reconfigurable antenna is proposed that provides an efficient solution. By reconfiguring parasitic striplines placed around a radiating dipole and reflecting metal pieces under the dipole using p-i-n diodes, the antenna main beam can be switched to five directions in the elevation plane, approximately from $-90^{\circ }$ (left endfire), $-45^{\circ }$ , 0 $^{\circ }$ (boresight), $+45^{\circ }$ , to $+90^{\circ }$ (right endfire). The proposed antenna operates at 2.45 GHz with dimensions of about 0.57 $\lambda$ $\times\, 0.45\lambda$ $\times\, 0.28\lambda$ . An antenna prototype is fabricated and measured. For all five directional beams, the measured $|S_{11}|$ values are below $-$ 13 dB, and the measured realized gains range from 5.2 to 6.5 dBi. They agree reasonably well with the simulated ones.

116 citations

Journal ArticleDOI
TL;DR: In this paper, a planar pattern-reconfigurable antenna based on arc dipoles is proposed, which consists of four identical arc dipole and a broadband reconfigurable feeding network, which are printed on the bottom and top layers of the substrate.
Abstract: A simple compact planar pattern-reconfigurable antenna based on arc dipoles is proposed in this letter. The antenna consists of four identical arc dipoles and a broadband reconfigurable feeding network, which are printed on the bottom and top layers of the substrate, respectively. By switching the on/off states of the p-i-n diodes, which are integrated in the reconfigurable feeding network, four different modes with endfire radiation patterns can be obtained in the azimuthal plane. The antenna is simulated, fabricated, and measured. Experimental results indicate that the proposed antenna achieves a bandwidth of 33.6% (2.25–3.16 GHz) for impedance matching better than 10 dB. The measured average gain is 4.11 dBi. Furthermore, the radiation efficiency is up to 60%. The proposed antenna is suitable for WLAN applications in wireless communications.

94 citations

Journal ArticleDOI
TL;DR: In this paper, a wideband antenna with reconfigurable broadside and endfire radiating patterns is presented. But the proposed antenna adopts a variation of strip quasi-Yagi structure, where six parasitic strip directors are divided into two groups and located on two opposite sides of the driver.
Abstract: This letter presents a novel wideband antenna with reconfigurable broadside and endfire radiating patterns. The proposed antenna adopts a variation of strip quasi-Yagi structure. A wideband omnidirectional monopole is used as the driver. Six parasitic strip directors are divided into two groups and located on the two opposite sides of the driver. Two reflectors are printed on the other side of the substrate. Four p-i-n diodes are used to control the length of the reflectors and further regulate the radiating pattern. Measured results show that the proposed antenna can work at C-band with a relative bandwidth of 29%. The proposed antenna has two endfire patterns and one broadside pattern, which point to the directions of θ = ±90° and θ = 0° in the elevation plane, respectively.

87 citations

Journal ArticleDOI
TL;DR: In this article, a novel pattern reconfigurable antenna is proposed by introducing a unique finite periodic structure, where the H-shaped units are precisely arranged on the both sides of the dipole to direct the power flowing in the end-fire direction.
Abstract: A novel pattern reconfigurable antenna is proposed in this letter by introducing a unique finite periodic structure. The H-shaped units are precisely arranged on the both sides of the dipole to direct the power flowing in the end-fire direction. When the antenna operates with the PIN diodes between the units, different radiation patterns can be easily achieved by changing the states of these PIN diodes. The prototype of the pattern reconfigurable antenna with three patterns is fabricated and measured. The experimental results show that the end-fire mode of the antenna has a front-to-back ratio as high as 15 dB and the pattern reconfigurable capability is successfully achieved in the band of 2.47-2.9 GHz.

81 citations