scispace - formally typeset
Search or ask a question
Author

Yan-Hui Ke

Bio: Yan-Hui Ke is an academic researcher. The author has contributed to research in topics: Omnidirectional antenna & Radiation pattern. The author has an hindex of 2, co-authored 7 publications receiving 19 citations.

Papers
More filters
Journal ArticleDOI
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.

12 citations

DOI
TL;DR: In this paper , a novel pattern-reconfigurable dielectric resonator (DR) antenna with end-fire beam-scanning feature is proposed, which consists of a DR, a switchable director with 10 p-i-n diodes, and a differential feeding structure.
Abstract: A novel pattern-reconfigurable dielectric resonator (DR) antenna with endfire beam-scanning feature is proposed in this letter. The proposed antenna consists of a DR, a switchable director with 10 p-i-n diodes, and a differential feeding structure. The differential-fed DR operating in TE01δ mode can provide a primary endfire pattern with wide beam. Based on this, a large-coverage beam-scanning performance can be obtained by introducing a switchable director placed in front of the DR. A prototype is fabricated and measured to verify the proposed design. By switching the p-i-n diodes of the switchable director, the proposed antenna enables a near-continuous beam scanning from −48° to +48° in the azimuth plane with a gain fluctuation of less than 0.5 dB. Besides, the 3 dB scanning coverage is up to 164° (from −82° to +82°), which shows good beam-scanning performance.

4 citations

DOI
TL;DR: In this article, a simple and effective self-decoupling method for dielectric patch (DP) antenna (DPA) by choosing proper structural parameters, without adding extra components, is presented.
Abstract: This letter presents a simple and effective self-decoupling method for dielectric patch (DP) antenna (DPA) by choosing proper structural parameters, without adding extra components. By theoretical analysis, the attenuation constant of the employed fundamental TM01 mode outside the DP is controlled by the structural parameters of the DP resonator, which is crucial for the decoupling between the two adjacent DPAs. It is found that the larger the attenuation constant of the TM01 mode, the better the port-to-port isolation in broadband, and then the radiation pattern can be stabilized. Under the premise of satisfactory isolation, the operational bandwidth and boresight gain of the DPA are studied for ensuring good antenna performance, exhibiting high design freedom and flexibility of the DPA. For demonstration, 1 × 2 closely spaced DPAs with optimal parameters are fabricated and measured. The simulated and measured results show good agreement.

2 citations

DOI
TL;DR: In this paper , a broadband dual-polarized dielectric patch (DP) antenna is investigated for the in-band full-duplex applications, where four resonant modes are excited and adjusted to form the two wide operating bands with orthogonal polarization.
Abstract: A broadband dual-polarized dielectric patch (DP) antenna is investigated for the in-band full-duplex applications. Taking full advantage of the multimode feature of DP, four resonant modes are excited and adjusted to form the two wide operating bands with orthogonal polarization. Among them, the dominant TM10 mode and the high-order TE12 mode provide the x-polarization while the TM11 mode and the antiphase TM02 mode provide the y-polarization. In addition, the differential-fed scheme is applied to excite the y-polarization modes for high isolation. Thanks to the features of low loss and low profile of DP, the proposed antenna obtains advantages in terms of radiation efficiency and profile height. An antenna prototype is fabricated and measured. The experimental results illustrate that the measured isolation during the whole band is better than 48 dB with a low profile of 0.05 λmin. The −10 dB bandwidths of two polarizations are 29.5% (4.71–6.1 GHz) and 18.9% (4.81–5.72 GHz), respectively.

1 citations

DOI
TL;DR: In this paper , a circularly polarized (CP) hybrid dielectric resonator antenna (DRA) with wide bandwidth and compact size is proposed, which can be combined together for broadband operation, which are the cross slot mode, the DR mode, and the distributed patch mode, respectively.
Abstract: A circularly polarized (CP) hybrid dielectric resonator antenna (DRA) with wide bandwidth and compact size is proposed in this letter. Three CP modes can be combined together for broadband operation, which are the cross-slot mode, the DR mode, and the distributed patch mode, respectively. The cross-slot functions as both a radiator and part of the feeding structure, providing the first CP mode and excites the other two CP modes, respectively. The 2 × 2 distributed patch is inserted inside the DR. The DR and the patch can generate another two CP modes without enlarging the DR size. Through optimization, these three CP modes can be combined to achieve a wide operating bandwidth with a compact size of 0.39 × 0.39 × 0.14 λ03 (λ0 is the free-space wavelength at the center frequency of 3.5 GHz). A prototype was fabricated and measured for demonstration. It has an impedance bandwidth of 38.9% (2.9–4.3 GHz), an axial ratio bandwidth of 34.3% (2.9–4.1 GHz), and a realized gain between 5.6 and 6.7 dBi.

Cited by
More filters
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.