Dual‐band circularly polarized antenna with a QUAD‐EMC structure

Chang, The-Nan; Ni, Guo-Yang

doi:10.1002/mop.22231

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…In this article, we use four nearly squared patches instead of four truncated patches as was used in Ref. 9 to construct a quad-unit. It is expected that a CP wave can also be excited this way since each nearly squared patch can also support two degenerative modes.…”

Section: Methods To Excite the Quad-unitmentioning

confidence: 99%

Methods to excite circularly polarized waves for a quad‐unit

Chang

2007

Micro & Optical Tech Letters

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obtained from the generalized Z T-chart in Eq. (29). Therefore, the computerized generalized Z T-chart can provide accurate results indeed, and it can be used effectively in analysis and design of BCITLs. CONCLUSIONSA graphical tool, called a generalized T-chart, for analysis and design of BCITLs is developed in this article. It is a generalized version of the standard T-chart developed for solving CCITL problems. Because of the fact that the CCITL is a special case of the BCITL when Z 0 ϩ ϭ ͑Z 0 Ϫ ͒*,, which means that the generalized T-chart can be reduced to the standard T-chart when the condition is satisfied. The use of the generalized T-chart is found to be similar to that of the standard T-chart. A computerized software is developed and employed in this study. It is found that the software provides accurate results. Further applications of the generalized T-chart will be investigated in the future. 3. D. Torrungrueng and C. Thimaporn, Application of the T-chart for solving exponentially tapered lossless nonuniform transmission-line problems, Microwave Opt Technol Lett 45 (2005), 402-406. 4. D. Torrungrueng and C. Thimaporn, Applications of the ZY T-Chart for nonreciprocal stub tuners, Microwave Opt Technol Lett 45 (2005), 259 -262. 5. D. Torrungrueng, A. Wongwattanarat, and M. Krairiksh, On the magnitude of the voltage reflection coefficient of terminated reciprocal uniform lossy transmission lines, Microwave Opt Technol Lett, in press. 6. D.M. Pozar, Microwave engineering, 3rd ed., Wiley, Hoboken, NJ, 2005.ABSTRACT: In this article, techniques to generate circularly polarized waves for a quad-unit are investigated. The quad-unit is offset-fed by an open rectangular ring. It has been shown that both 3-dB axial ratio and 10-dB return loss bandwidths can be achieved up to 11%. With a large ring, we have a stable maximum beam at the bore-sight direction. In experiments, it can provide a gain of 7 dBic at 5.5 GHz.

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Section: Methods To Excite the Quad-unitmentioning

confidence: 99%

Methods to excite circularly polarized waves for a quad‐unit

Chang

2007

Micro & Optical Tech Letters

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“…Multiband antennas have attracted interest of researchers worldwide. A number of studies have discussed multiband CP and/or linearly polarized (LP) antenna designs with single or multiple feeding points in the open literature . Quadrifiler helixes, annular rings, slotted patches, split ring resonators (SRRs) and stacked patches are some of the popular ways to generate multiple resonances with good CP operation.…”

Section: Introductionmentioning

confidence: 99%

Design of a compact multiband circularly polarized antenna for global navigation satellite systems and 5G/B5G applications

Falade

Ur-Rehman

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

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Design of a multiband circularly polarized antenna is proposed in this article. The antenna has a simple and compact form factor by employing single-feed stacked patch structure. It exhibits good performance at the global navigation satellite system (GNSS) frequency bands of L1, L2, and L5 and cellular communications frequency band of 2.3 GHz. The antenna has a 3-dB axial ratio bandwidth of 1.1%, 1.0%, 4.1%, and 1.5% at the four operating bands of L1 (1.575 GHz), L2(1.227 GHz), L5 (1.176 GHz), and 2.3 GHz. The antenna also achieves a gain of more than 2.2 dBiC and efficiency of more than 70% at the four frequencies. A detailed parametric study is carried out to investigate the importance of different structural elements on the antenna performance. Results are verified through close agreement of simulations and experimental measurements of the fabricated prototype. Good impedance matching, axial ratio bandwidth, and radiation characteristics at the four operating bands along with small profile and mechanically stable structure make this antenna a good candidate for current and future GNSS devices, mobile terminals, and small satellites for 5G/Beyond 5G (5G/B5G) applications. K E Y W O R D S5G/B5G, circular polarization, global navigation satellite systems, multiband, stacked patch, symmetric slots

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“…The dual‐band CP antennas operating at UHF and microwave band have been presented by using different techniques to achieve CP as published in Refs. . In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. , a single‐fed dual‐band antenna was presented using an aperture coupled technique to obtain CP. With this technique, the antenna gain at a low‐frequency band is fairly good but the gain at a higher frequency band is relatively low.…”

Section: Introductionmentioning

confidence: 99%

Dual-band circularly polarized flat antenna with plano convex and concave slots for RFID readers

Wongsakulphasatch

Phongcharoenpanich

2017

Int J RF Microw Comput Aided Eng

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This article has proposed a circularly polarized dual‐band antenna with unidirectional pattern operating at the bandwidth frequencies of 920–925 MHz and 2.40–2.48 GHz for radiofrequency identification (RFID) readers. The proposed antenna structure is of a radiating patch with a single feeder and two pairs of plano convex and concave slots. This work has innovated and utilized the convex and concave slotting technique to generate the circular polarization. The simulated results showed that the dual‐band antenna is of circular polarization (CP) and unidirectional radiation pattern with the 3 dB axial ratio and the respective gains of 1.31 and 1.36 dBic for the experimental lower and upper bandwidth frequencies. An antenna prototype was subsequently fabricated and tests performed. The simulated and measured results are in good agreement, rendering the proposed dual‐band antenna with plano convex and concave slots suitably applicable to the ultrahigh frequency and microwave RFID readers.

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Dual‐band circularly polarized antenna with a QUAD‐EMC structure

Cited by 12 publications

References 6 publications

Methods to excite circularly polarized waves for a quad‐unit

Methods to excite circularly polarized waves for a quad‐unit

Design of a compact multiband circularly polarized antenna for global navigation satellite systems and 5G/B5G applications

Dual-band circularly polarized flat antenna with plano convex and concave slots for RFID readers

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