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This article proposes a meandered printed loop antenna for the fourth generation (4G) mobile system applications. Using a coupling strip connected with a 50 Ω microstrip fed-line on front side, the loop antenna on back side is excited and a half wavelength (0.5 λ) resonant mode and its higher modes are successfully resonated. A plane copper strip connected at top of the loop antenna is used to increase the antenna's path and to decrease the lower operation band to cover LTE 700 band. Two 15 nH ceramic chip inductors, which are embedded in the loop antenna, are used to decrease the antenna's 1 and 1.5 λ resonant modes. The 0.5, 1, and 1.5 λ resonant modes get together to form a broad lower operation band (693-1031 MHz) for LTE 700 and GSM 850/900 applications. Beside, the antenna's higher resonant modes are also excited to form a broad higher operation band (1668-2781 MHz) for DCS, PCS, UMTS, LTE 2300, LTE 2500, and WLAN applications. The proposed antenna also has an advantage of small size, which is 114 × 50 mm2 including a loop antenna of 14 × 50 mm2 and a ground plane of 100 × 50 mm2. With the advantages of board band, compact size, low cost, and good performance, the proposed antenna appears to be an optimal candidate for the 4G mobile applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2157-2163, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26997 [ABSTRACT FROM AUTHOR]

This article proposes a compact printed meander loop antenna for the fourth generation (4G) mobile system applications.The total length of the meander loop operates a one-wavelength resonant mode (mode 1) at 774 MHz. To increase the antenna's operation bandwidth, this article uses coupled-fed feeding method that contains a coupling patch connected with a 50-Ω microstrip feed line. By applying the coupled-fed method, a new one-wavelength resonant mode (mode 2) is excited. After carefully adjusted the size of coupling patch, the frequency of mode 2 shifts to 904 MHz combining with mode 1 to form dual broad operations bands. The measured dual broad bands from 658 to 963 MHz and from 1658 to 2693 MHz can be applied in the 4G mobile system, especially for the long-term evolution application. The two resonant modes are resonated by 1λ loop type that has less influence by changing the size of ground plane. The antenna portion and overall dimensions of the proposed antenna are 20 × 60 × 0.8 mm3 and 120 × 60 × 0.8 mm3 suitable for today's mobile phone application. With the advantages of board band, compact size, low cost, and good performance, the proposed antenna appears to be a promising candidate for the 4G mobile applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1900-1907, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26927 [ABSTRACT FROM AUTHOR]

In this article, the equivalent circuit of the ring-like resonator with different impedance is simply modeled as the parallel GLC lumped element. We then investigated the equivalent lumped elements of the ring-like resonator with different width of the ring (i.e., different impedance of the ring) by using the transmission-line analysis. The resonant frequency shifts to higher frequency when the width of the ring structure is increased. It is noted that when the width of the ring structure is large enough, the resonant frequency of the ring structure will be very close with that of the patch structure. The circuit simulated results from the extracted element values are in good agreement with the full-wave simulation results and the measured results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 615–618, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24130 [ABSTRACT FROM AUTHOR]