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Author

Yang Lingling

Bio: Yang Lingling is an academic researcher from Nantong University. The author has contributed to research in topics: Dielectric & Patch antenna. The author has an hindex of 1, co-authored 6 publications receiving 15 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a differential-fed gain-enhanced dual-polarized dielectric patch antenna operating at higher order TM121 and TM321 modes is investigated, which not only moves the higher-order TM121 mode upwards to enhance the gain of the antenna, but also enables the higherorder TM321 mode to be excited and combined with TM121 modes to expand the bandwidth.
Abstract: A differential-fed gain-enhanced dual-polarized dielectric patch antenna operating at higher order TM121 and TM321 modes is investigated in this letter. The introduction of grounded bars in a conventional square dielectric patch resonator (DPR) is a key technique in the proposed design. It not only moves the higher order TM121 mode upwards to enhance the gain of the antenna, but also enables the higher order TM321 mode to be excited and combined with TM121 mode to expand the bandwidth. Their corresponding degenerate modes in the DPR are used to generate a dual-polarized operation. By using two identical pairs of differential feeding lines to excite the proposed DPR, several advantages such as high isolation and low cross polarization can be obtained. For demonstration, an antenna prototype centered at about 4.9 GHz is implemented and measured. The simulated and measured results are given, showing a good agreement.

44 citations

Journal ArticleDOI
TL;DR: By adding p-i-n diodes to the ends of the coupled quarter-wavelength lines, the proposed balun enables three-status operation while it has compact size and simple configuration.
Abstract: This letter proposes a microstrip switchable dual balun using a symmetrical three-coupled-line structure, which is used as a feeding network for designing a pattern-reconfigurable endfire antenna. By adding p-i-n diodes to the ends of the coupled quarter-wavelength lines, the proposed balun enables three-status operation while it has compact size and simple configuration. Based on this, a pattern-reconfigurable endfire antenna is designed, fabricated, and measured. Good agreement between the simulated and measured results can be observed. The peak gain of two directional statuses reaches 5.8 dBi and the front-to-back ratio (F/B) is more than 18 dB. Meanwhile, the peak gain of bidirectional status reaches 2.7 dBi and the F/B is less than 0.5 dB.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a strip-loaded dielectric ring resonator (DRR) and near zero index (NZI) metamaterial (NZIM) was used to improve the in-band gain and enhance the filtering capability of a broadband filtering quasi-Yagi DRR antenna.
Abstract: This paper presents a design approach of broadband filtering quasi-Yagi DRR Antenna using a strip-loaded dielectric ring resonator (DRR) and near-zero-index (NZI) metamaterial (NZIM). The ring strip is loaded to the inside wall of the DRR so that the TE $_{01 \delta }$ and TE $_{21\delta }$ modes of the DRR can be close. Meanwhile, they function as a dual-mode magnetic dipole (M-dipole) driver and can be differentially excited at the same time for designing a wideband quasi-Yagi antenna. Benefiting from the dual-mode operation of the strip-loaded DRR, the end-fire gain across the operating band of the antenna is stable with preliminary bandpass filtering characteristics. To improve the in-band gain and enhance the filtering capability, a new coplanar NZIM with wideband NZI characteristic and dual transmission notches in the lower and upper stopbands of the preliminary gain passband, is introduced and put in the front of the DRR driver. To verify the proposed design concept, an X-band filtering quasi-Yagi antenna with the NZIM is fabricated and measured. Good agreement between the simulated and measured results can be observed. The wideband antenna has a measured −10 dB impedance bandwidth of about 16% (8.5 – 10 GHz). Within it, the peak gain of antenna reaches 8.3 dBi and 1-dB gain fractional bandwidth is about 10.8%. Meanwhile, it exhibits good gain bandpass response due to the transmission notches of the NZIM.

6 citations


Cited by
More filters
Journal ArticleDOI
Xiao Zhang1, Kai-Dong Hong1, Lei Zhu2, Xiao-Kun Bi1, Tao Yuan1 
TL;DR: In this article, a wideband differentially fed patch antennas under dual high-order modes for stable high gain are proposed in this communication, where two open slots are loaded to the patch edge to reconstruct the current distribution of TM31 mode, thus substantially increasing the broadside radiation and an additional slot is introduced at the patch center to perturb the TM12 mode and reshape its current to be more in-phase.
Abstract: Wideband differentially fed patch antennas under dual high-order modes for stable high gain are proposed in this communication. The working principle is verified on a differentially fed circular patch antenna operating in TM31 and TM12 modes at first. Two open slots are loaded to the patch’s edge to reconstruct the current distribution of TM31 mode, thus substantially increasing the broadside radiation. An additional slot is introduced at the patch center to perturb the TM12 mode and reshape its current to be more in-phase, by which sidelobe radiation is dramatically reduced. With use of loading of slots and shorting pins, the two modes are allocated in resonant frequencies to make up an enhanced bandwidth of 13.4% and produce high gain up to 13.7 dBi, with the beamwidth and gain level nearly unchanged in band. Then, the proposed method is further developed on a rectangular patch antenna, where three cascaded slots and four shorting pins are loaded to perturb TM21 and TM03 modes, and reshape their current distributions. In a similar way, the broadside radiation of TM21 mode is enhanced and the sidelobe of TM03 mode is suppressed. At last, the antenna obtains a bandwidth of 12.4% and stable realized gain as high as 14.0 dBi.

34 citations

Journal ArticleDOI
21 Apr 2020-Sensors
TL;DR: A comprehensive and in-depth review of the existing research on differential-fed microstrip filter designs are presented and discussed with a focus on recent advances in this research and the challenges facing the researchers.
Abstract: Differentially driven devices represent a highly promising research field for radio frequency (RF), microwave (MW), and millimeter-wave (mmWave) designers and engineers. Designs employing differential signals are essential elements in low-noise fourth-generation (4G) and fifth-generation (5G) communications. Apart from the conventional planar MW components, differential-fed balanced microstrip filters, as promising alternatives, have several advantages, including high common-mode rejection, low unwanted radiation levels, high noise immunity, and wideband harmonic suppression. In this paper, a comprehensive and in-depth review of the existing research on differential-fed microstrip filter designs are presented and discussed with a focus on recent advances in this research and the challenges facing the researchers. A comparison between different design techniques is presented and discussed in detail to provide the researchers with the advantages and disadvantages of each technique that could be of interest to a specific application. Challenges and future developments of balanced microstrip bandpass filters (BPFs) are also presented in this paper. Balanced filters surveyed include recent single-, dual-, tri-, and wide-band BPFs, which employ different design techniques and accomplish different performances for current and future wireless applications.

16 citations

Journal ArticleDOI
TL;DR: In this article , the CTLA composite ceramic patch fired with silver coating is mounted on the Rogers RO4003C substrate operating as a magnetic wall boundary and a simplified cavity-like theoretical model is used to analyze the proposed DPA structure and the accuracy of this antenna model is evaluated by the theoretical results from a commercial CST Microwave Studio 2019.
Abstract: In this paper, the medium dielectric constant 0.65CaTiO3‐0.35LaAlO3 (CTLA) composite microwave ceramic is employed to introduce in dielectric patch antennas (DPA). Typical, high‐performance microwave dielectric properties of εr ≈ 44.8, Q × f ≈ 43 950 GHz@3.67 GHz and TCF ≈ 0 ppm °C–1 can be obtained by solid‐state reaction method in CTLA composite microwave ceramics sintered at 1450 °C for 2 h. Then, the CTLA composite ceramic patch fired with silver coating is mounted on the Rogers RO4003C substrate operating as a magnetic wall boundary. A simplified cavity‐like theoretical model is used to analyze the proposed DPA structure and the accuracy of this antenna model is evaluated by the theoretical results from a commercial CST Microwave Studio 2019. Based on this, the CTLA composite ceramic physical property is modified to enhance the radiation efficiency and reduce profile of the DPA. The higher‐order TM121 mode is brought close to the dominant TM101 mode by taking advantage of the multimode characteristics of the dielectric patch resonator and introducing a sintered silver slot in the ceramic dielectric patch. For demonstration, the proposed DPA prototype operating in the multiprobe antenna near the field measurement system is implemented and measured.

16 citations

Journal ArticleDOI
TL;DR: In this paper , a symmetric split ring resonator (SRR) based metamaterial (MTM) is presented that exhibits three resonances of transmission coefficient (S21) covering S, C, and X-bands with epsilon negative (ENG) and near zero index properties.
Abstract: In this article, a symmetric split ring resonator (SRR) based metamaterial (MTM) is presented that exhibits three resonances of transmission coefficient (S21) covering S, C, and X-bands with epsilon negative (ENG) and near zero index properties. The proposed MTM is designed on an FR4 substrate with the copper resonator at one side formed with two square rings and one circular split ring. The two square rings are coupled together around the split gap of the outer ring, whereas two split semicircles are also coupled together near the split gaps. Thus, gap coupled symmetric SRR is formed, which helps to obtain resonances at 2.78 GHz, 7.7 GHz and 10.16 GHz with desired properties of the MTM unit cell. The MTM unit cell's symmetric nature helps reduce the mutual coupling effect among the array elements. Thus, different array of unit cells provides a similar response to the unit cell compared with numerical simulation performed in CST microwave studio and validated by measurement. The equivalent circuit is modelled for the proposed MTM unit cell in Advanced Design System (ADS) software, and circuit validation is accomplished by comparing S21 obtained in ADS with the same of CST. The effective medium ratio (EMR) of 10.7 indicates the compactness of the proposed MTM. A test antenna is designed to observe the effect of the MTM over it. Numerical analysis shows that the proposed MTM have an impact on the antenna when it is used as the superstrate and helps to increase the gain of the antenna by 95% with increased directivity. Thus, compact size, high EMR, negative permittivity, near zero permeability and refractive index makes this MTM suitable for S, C and X band applications, especially for antenna gain with directivity enhancement.

12 citations

Journal ArticleDOI
TL;DR: In this paper, a varactor-loading scheme is proposed for dielectric patch (DP) antenna to design frequency-reconfigurable antenna and array and the impacts of the microstrip line dimensions on frequency tuning range (TR) and radiation efficiency of the antenna are investigated in detail.
Abstract: A novel varactor-loading scheme is proposed for dielectric patch (DP) antenna to design frequency-reconfigurable antenna and array. Benefiting from the stacked structure of the DP antenna, the microstrip line is partially inserted between the DP and substrate in a simple way, and the extended part can be used to load the varactor, thereby realizing the function of frequency tunability. At the same time, the loading element has a slight effect on the radiation patterns of the proposed antenna. The impacts of the microstrip line dimensions on frequency tuning range (TR) and radiation efficiency of the antenna are investigated in detail. It is found that an appropriate inserted length of the microstrip line is a key to achieve a good tradeoff between the frequency TR and radiation efficiency. The resultant frequency-reconfigurable DP antenna shows a TR of about 15% and radiation efficiency of more than 50% across the frequency-TR. For demonstration, the DP antenna element and $2\times 2$ array prototypes operating in the ${C}$ -band are implemented and measured. The simulated and measured results with a good agreement are presented to verify the proposed idea.

12 citations