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A novel synthesis method based on transversal coupling matrix for the parallel-scheme filtering antenna with high out-of-band selectivity is proposed. The filtering antenna consists of three resonant radiation elements that are connected to a common feed point. By adopting the parallel scheme, the design of a third-order filtering antenna can be de...
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Citations
This article proposes a full-metal omnidirectional series-fed filtenna array. The antenna is primarily composed of an outer metal shell, a built-in metal post and three pairs of open circuit branches. To achieve horizontal omnidirectional radiation, a circular groove is dug on the outer metal shell. Additionally, the built-in metal post is connected to the coaxial feed and shorted at the end with the outer shell. The antenna’s filtering principle can be interpreted as a second-order bandpass filter without any transmission zeros. To enhance out-of-band suppression, three pairs of open stubs have been introduced. And then, three radiation nulls are incorporated to improve frequency selectivity and out-of-band suppression without increasing additional circuit size. Finally, a 3D-printed series-fed filtenna has been fabricated and measured. The -10-dB |
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| impedance fractional bandwidth is 3% (ranged from 2.79 GHz-2.875 GHz), the antenna peak gain is 6.6 dBi, and the three radiation nulls are located at 2.55 GHz, 2.69 GHz and 3.09 GHz, respectively. The measured out-of-band suppression is 28 dB.
In this paper, a laminated planar feed structure has been proposed to excite the omnidirectional radiation modes of a dielectric resonator (DR): TM01δ, TM011+δ and TM012+δ. The resonant frequencies of the three modes are 2.44, 2.78 and 3.10 GHz respectively. By combining three resonant frequencies, the proposed band-notched dielectric resonator antenna (DRA) achieves a wide impedance bandwidth and stable omnidirectional radiation pattern in the whole passband. The simulated passbands of the proposed band-notched DRA are 2.23–2.56 GHz and 2.71–3.17 GHz. The laminated planar feed structure also can produce an adjustable radiation null (RN) at the upper edge of the passband, improving the skirt selectivity. To suppress in-band interference, four metal patches have been plated on the side walls of the DR and another adjustable RN (notched frequency) is generated within the passband. By changing the size of the metal patch, the notched band can be adjusted. In a word, the proposed DRA has numerous advantages such as wideband, stable omnidirectional radiation, filtering and band-notched functions. A prototype has been fabricated and measured for demonstration, and the measured results are coincided with the simulated ones.
