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3D Hilbert resonator, although covering larger substrate area then other configurations, demonstrated very high values of unloaded Q. Simulations have shown that this advantage can further be exploited by decreasing line widths and spacing in the 3D curve, which can be easily done with LTCC technology. CONCLUSIONIn this paper, four novel multilayer microstrip resonators were analyzed via full-wave EM simulations and compared in terms of loaded and unloaded quality factor. All the dimensions were kept in accordance with standard TF procedure.The 3D Hilbert resonator was shown to be superior to all the other configurations examined, both 3D and 2D, thus demonstrating the benefits to be gained from the employment of multilayer fractal shapes in resonators and filters. [5]. In this paper, we propose a novel rectangular slot antenna embedded with a pair of narrow rectangular strips for dual-broadband operation in WLAN communication. Probably due to the narrow strip embedded symmetrically along the center line of the rectangularslot antenna, a new resonant mode close to the second resonant mode of the regular rectangular-slot antenna can be excited to enhance the operating bandwidth of high band, which simultaneously covers the required bandwidth of 5.2 GHz (5.15-5.35 GHz) and 5.8 GHz (5.725-5.825 GHz). It is found that by properly adjusting the spacing between the two narrow strips to be 2 mm, the obtained bandwidths for the 2.4-and 5-GHz bands are 11% (254 MHz) and 24.8% (1446 MHz), respectively, which is sufficient for wireless communication. The proposed dual-broadband rectangular slot antenna also provides the frequency ratio of two operating modes in the range of 1.66 -2.52 with various spacings between the two narrow strips, which is wider than that of the dual-broadband slot-antenna design [5]. The details of the proposed slot antenna designs are described, and the experimental results for the dual-broadband performance obtained are presented and discussed. ANTENNA DESIGNAs shown in Figure 1, a pair of narrow rectangular strips of width b and the length T is embedded symmetrically along the center line of the rectangular slot antenna. The spacing between the two rectangular strips is denoted as S here. The rectangular slot antenna of L ϫ W is etched on an inexpensive FR4 substrate with dielectric constant r (4.4) and substrate thickness h (0.8 mm). In this study, due to the presence of the embedded rectangular strips with less spacing, a new resonant mode close to the second resonant mode of the rectangular slot antenna can be easily excited in order to obtain the desired dual-broadband operation, for example, the WLAN operations in the 2.4-and 5.8-GHz bands. However, the fundamental resonant mode of the proposed slot antenna is less perturbed. And, as the spacing between two narrow strips is more than half of the length of the slot antenna, both of the two operating frequencies increase when the spacing is increased in order to obtain a different operating-frequency-variation trend, compared with the propo...

A novel dual‐broadband T‐shaped monopole antenna with dual shorted L‐shaped strip‐sleeves for 2.4/5.8‐GHz wireless local area networks (WLANs) is proposed. Dual L‐shaped strip‐sleeves to be shorted with the ground plane are introduced in order to excite the upper resonant mode for operation at the 5.8‐GHz band. The obtained impedance bandwidths reach about 35% for the 2.4‐GHz band and 10.0% for the 5.8‐GHz band, which meets the required bandwidth specifications of the IEEE 802.11a/b/g standards. The measured peak antenna gains for the operating frequencies across dual WLAN bands are measured to be 3.4 and 1.0 dBi, respectively, with gain variations within 0.8 dBi. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 65–69, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20903

A novel dual‐broadband Y‐shaped monopole antenna with dual shorted I‐shaped strip‐sleeves for 2.4/5.2/5.8‐GHz wireless local area networks (WLANs) is proposed. Dual I‐shaped strip‐sleeves are introduced to be shorted with the ground plane to excite the upper resonant mode for operating at the 5.8‐GHz band. The obtained impedance bandwidths reach about 48.5% for the 2.4‐GHz band and 35.5% for the 5‐GHz band, which meet the required bandwidth specifications of IEEE 802.11a/b/g standards. The measured peak antenna gains for the operating frequencies across dual WLAN bands are measured to be 4.7 and 4.9 dBi, respectively, with gain variations within 0.5 dBi. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1476–1480, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21735

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A novel design of semicircular slot antenna with dual‐broadband operation for 2.4/5 GHz wireless local network area (WLAN) is proposed. With the use of an arc‐shaped strip inset along the circle edge of the semicircular slot antenna, a new resonant mode close to the second operating mode of the regular semicircular slot antenna is excited to enhance the operating bandwidth of the high band, and the obtained impedance bandwidths for two operating bands can reach about 14.8% for 2.4 GHz band and 22.0% for 5 GHz band, which cover the required bandwidths of IEEE 802.11b/g (2.4–2.484 GHz) and IEEE 802.11a (5.150–5.950 GHz). The measured peak antenna gains for the operating frequencies across dual WLAN bands are measured to be, respectively, 4.7 and 4.9 dBi with the gain variations within 0.5 dBi. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2165–2169, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22670

A planar dual‐meander‐line antenna consisting of three branch strips for a low‐profile GSM/DCS/PCS/WLAN multiband mobile handset is proposed. The branch strips are designed to operate as quarter‐wavelength structures at 900 and 2000 MHz, respectively, and the obtained impedance bandwidths are 120 MHz (about 13.2%) and 924 MHz (about 44.4%) for covering the required bandwidths of the GSM (890–960 MHz) and DCS/PCS/UMTS/WLAN (1710–1880/1850–1990/1920–2170/2400–2484 MHz) bands. The proposed antenna can be mounted on top of a mobile phone with a low profile of 20 mm from ground plane. The measured antenna radiation patterns are approximately omnidirectional across the multiresonant bands. Peak antenna gains for operating frequencies across the GSM/DCS/PCS/UMTS/WLAN multiple bands are measured to be 1.8 and 2.9 dBi, respectively, with gain variations within 0.5 dBi. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 883–888, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21507

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