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We propose a multiband antenna that exhibits a dual coupling characteristic and dual frequency operation using a dual spiral stripline-loaded monopole in conjunction with L-shaped slots in a ground plane. The slots allow the upper part of the ground plane to function as an additional monopole that resonates in concordance with the existing resonances of the upper and lower spiral stripline monopoles...
This paper presents the dual-spiral strip line-loaded monopole antenna for multiband applications was presented. The antenna occupies a volume of 37 times 12 times 7 mm3 and supports a dual wide band covering Cellular, PCS, UMTS, and IMT-2000 bands. Considering its small size, dual wide bandwidth, and monopole-like radiation patterns, the proposed antenna is very suitable as an internal multiband...
We have presented a dual spiral line loaded monopole antenna on a vertical ground plane. The antenna has a 152 MHz impedance bandwidth (820 ~ 972 MHz) for VSWR<2 at a central frequency of 896 MHz. The proposed antenna covers both the cellular and UHF RFID bands in Korea and is suitable as the internal antenna of a handheld transceiver unit because of its thin configuration, broad bandwidth, and...
In this paper, we present a small dual spiral line loaded monopole antenna on a vertical ground plane with a broad bandwidth and omni-directional radiation pattern. The proposed antenna has an impedance bandwidth of 12.3% for VSWR<2 with a center frequency at 1.10 GHz and small physical dimensions of 12 mm times 12 mm times 12 mm.
In this paper, a modified Wheeler cap method is proposed using a high order circuit model to more accurately estimate the efficiency of antennas containing such complicated operations. To verify the proposed method, the efficiency of a microstrip antenna with triple resonances was measured. Additionally, the efficiency of an electromagnetic coupled monopole antenna, which has more complicated operating...
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