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Proceedings ArticleDOI

Interesting Behavior of Rectangular Microstrip Patch with Specific Perturbations on the Ground Plane

05 Jul 2020-
TL;DR: In this article, a kind of metallic perturbation on the ground plane of a microstrip patch has been examined indicating some interesting as well as useful features, such as a strategic geometry, its location, and dimension can magically improve the pattern symmetry and also the cross-polarized (XP) level.
Abstract: A kind of metallic perturbation on the ground plane of a microstrip patch has been examined indicating some interesting as well as useful features. A strategic geometry, its location, and dimension can magically improve the pattern symmetry and also the cross-polarized (XP) level. A pair of metallic posts in an X-band rectangular patch demonstrates the same indicating about 20 dB improvement in the XP radiations. This design is free from fabrication tolerance and other high frequency related issues.
References
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Journal ArticleDOI
Biao Li1, Yingzeng Yin1, Wei Hu1, Yang Ding1, Yang Zhao1 
TL;DR: In this paper, a coax-feed wideband dual-polarized patch antenna with low cross polarization and high port isolation is presented, which can be used as a base station antenna for PCS, UMTS, and WLAN/WiMAX applications.
Abstract: A coax-feed wideband dual-polarized patch antenna with low cross polarization and high port isolation is presented in this letter. The proposed antenna contains two pairs of T-shaped slots on the two bowtie-shaped patches separately. This structure changes the path of the current and keeps the cross polarization under -40 dB. By introducing two short pins, the isolation between the two ports remains more than 38 dB in the whole bandwidth with the front-to-back ratio better than 19 dB. Moreover, the proposed antenna achieving a 10-dB return loss bandwidth of 1.70-2.73 GHz has a compact structure, thus making it easy to be extended to form an array, which can be used as a base station antenna for PCS, UMTS, and WLAN/WiMAX applications.

185 citations

Journal ArticleDOI
TL;DR: In this article, two photonic bandgap (PBG) structures, namely, the defected ground structure (DGS) and the compact microstrip resonant cell (CMRC), are applied to the feed line of microstrip antennas.
Abstract: Microstrip antennas inherently have a high input impedance at resonant frequency. This may not be convenient for some applications. For active integrated antennas, moreover, the radiated power of microstrip antennas needs to be very low at harmonic frequencies. The main goals of this study are impedance matching and harmonic suppression of microstrip antennas. In order to meet these requirements, two one-dimensional (1-D) photonic bandgap (PBG) structures, namely, the defected ground structure (DGS) and the compact microstrip resonant cell (CMRC), are applied to the feed line of microstrip antennas. The characteristic impedance of the microstrip line is controlled by the additional effective inductance of the PBG structure. Without any matching circuits, microstrip antennas can be easily fed by a simple 50 /spl Omega/ microstrip line with a PBG structure at the operating frequency. Additionally, the second harmonic of the proposed antennas is properly suppressed compared to a conventional antenna. Measured results indicate that the two PBG structures are quite effective for harmonic suppression. Therefore, the proposed antennas are suitable for active integrated antennas.

126 citations

Journal ArticleDOI
TL;DR: Experiments show that the proposed DFPA can obtain good patterns with symmetric copolarization and low cross-polarization across a bandwidth of 34.5% and can be conveniently integrated with microwave differential circuits.
Abstract: A novel differential-fed patch antenna (DFPA) is proposed in this letter. The proposed DFPA can be conveniently integrated with microwave differential circuits. Based on this differential feeding structure, wide bandwidth and good radiation patterns can be obtained. As a demonstration, a DFPA is designed and measured. Experiments show that the proposed DFPA can obtain good patterns with symmetric copolarization and low cross-polarization across a bandwidth of 34.5%

88 citations

Journal ArticleDOI
TL;DR: In this paper, a defect ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields.
Abstract: Defected ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields. Width to length ratio (aspect ratio) of a patch attributes different characteristic features. Therefore present experimental studies have been executed for four different aspect ratio values like 1.6, 1.3, 1.0 and 0.8. Folded defects have been employed in H-plane. Possibility of achieving high polarisation purity (over 25 dB isolation between co- to cross-polarised fields) with improved impedance bandwidth has been demonstrated. The variation in XP fields as a function of the patch aspect ratio has been investigated and a strong physical insight into the modal fields with and without DGS has been developed.

82 citations

Journal ArticleDOI
TL;DR: In this article, a novel compact electromagnetic band-gap (EBG) structure in a spiral shape is presented and investigated, which significantly enlarges the capacitance between neighboring elements, and two applications have been shown, including patch antenna with the spiral EBG structure and a double-element microstrip antenna array with low mutual coupling.
Abstract: A novel compact electromagnetic band-gap (EBG) structure in a spiral shape is presented and investigated. This structure significantly enlarges the capacitance between neighboring elements. The simulations and experimental results have proved that the size of the spiral structure is only 30.9% of the conventional EBG structure. Two applications have been shown, including patch antenna with the spiral EBG structure and a double-element microstrip antenna array with low mutual coupling. The measured results show that a gain improvement over 3 dB and a significant reduction of cross polarization in H-plane are obtained. A 6 dB reduction of mutual coupling is achieved in a double-element EBG microstrip antenna array.

79 citations