A novel, short-circuited, flat-plate dipole antenna for WLAN operation in the 2.4 GHz band is presented. The dipole antenna is narrow (5 mm in width) and structured to be of an L shape to fit in corners of possible wireless communications devices. The open ends of the two dipole arms are folded and face each other, so as to achieve a compact structure, and short-circuited via a short-circuiting strip, making it possible for the antenna to be cost-effectively fabricated by stamping one single metal plate only. The antenna when unbent into a flat, rectangular structure has dimensions 5 mm × 47 mm and can be easily fed by using a 50-Ω mini-coaxial cable. Details of a design prototype are described and discussed.
are shown compared with simulation results in Figures 3(a) and 3(b), respectively.Measured electrical performances in the operating band are given in Table 1.From the simulated and measured results of Figure 3, the proposed BRFs using double spur-lines have compact structures, but it can provide high rejection and good matching characteristics at both pass and rejection bands, respectively. At these examples, although the separation between the highest point of Rx-band and the lowest point of Tx-band is just 6% in scale of fractional bandwidth, which means Tx-and Rx-band are closely separated from each other, fabricated filters show the rejection performance of more than 15 dB and the return loss performance of more than 20 dB. This is possible because the proposed filter structure can make a sharp slope by appropriately choosing the intersection point of the reflection and transmission curve given by L 2 . CONCLUSIONSNovel BRF structures using double spur-lines were presented. Advantage of these structures is that planar BRFs can be easily and simply implemented into 50 X microstrip line itself without any additional elements, which can greatly reduces the circuit size. To check the validity of the structure proposed in this article, two kinds of BRFs, that is, Rx filter with Tx-band rejection and Tx filter with Rx-band rejection, were optimally designed and fabricated at Ku-band. The measured electrical performances made a good agreement with the simulated one. Because the proposed BRFs are compact and low cost, they will be useful for developing various BRFs embedded in microstrip-integrated circuits such as planar microstrip patch antenna and also could be widely used to improve TRx isolation of front-end filters in transceiver applications.
A printed, planar multi‐loop‐antenna system having high‐gain, quasi‐dual‐polarized radiation properties for concurrent, dual‐band WLAN operation in the 2.4 and 5.2 GHz bands is presented. The multi‐antenna design comprises four printed loop antennas arranged to be of a orthogonal configuration, printed on the same‐layer of a 1.6‐mm thick FR4 substrate, and one system PCB serving as an efficient reflector for the loops. The four antennas are set within the boundary of the PCB of the typical size for compact, outdoor access‐point (AP) applications and stacked there above by a small distance. In this study, the design integrates the system PCB of an AP into an internal multi‐antenna solution for compact outdoor APs. The results show that good input matching with 10‐dB return loss over the 2.4 and 5.2 GHz bands can be attained. Directional radiation patterns with comparable Eθ and Eφ fields were also obtained. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:317–322, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25736
optimize the input impedance to obtain a wider bandwidth of 146%, from 2.4 to 15.5 GHz, which can excellently cover the UWB bandwidth. The practical prototype is fabricated to perform an experiment to verify the simulation results and the measured results show good agreement with the simulated ones. Details of the antenna design and both the simulated and the measured results are presented and discussed.2. ANTENNA DESIGN and discussed.ABSTRACT: A novel printed monopole antenna with an ultra-wide bandwidth is presented. The proposed antenna has very compact size (12 Â 22 mm 2 ) as well as very simple configuration and easily fed by using a 50 X microstrip line. The antenna impedance bandwidth based on S 11 < À10 dB is from 3 to 14 GHz, about 130%. A stably omnidirectional radiation patterns over a wide bandwidth is obtained. These features will make the antenna attractive for modern ultrawideband applications.
A novel, one‐piece, loop‐like plate antenna that shows a symmetrical structure is proposed for wireless LCD TV applications in the 2.4/5.2/5.8 GHz bands. The antenna was constructed by stamping a rectangular, flat plate of size 30 mm × 70 mm and bent two times to form a 3D configuration of volume 10 mm × 10 mm × 70 mm. The design consists of a main radiating portion, one grounding portion, and one shielding wall. The radiating portion includes a symmetrical loop‐like structure and is able to generate multiple resonance. The antenna is easily affixed to the top wall of the display ground by making use of the grounding portion, and at the same time shielded from the back metal casing of the wireless thin LCD TV by the shielding wall. These arrangements make the antenna very easy to feed on both short sides and facilitate the feeding‐cable routing to the Wi‐Fi module on the back of the TV. Four possible cases of the antenna installed in a 42‐inch, widescreen LCD TV were investigated on the radiation performance. Details of the design prototypes are discussed in this article. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2232–2238, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26259
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