This article proposes a dual‐element antenna working in the 2.4/5‐GHz WLAN bands with high isolation. The antenna element is a coupled‐fed structure, which is formed by a driven monopole and a shorting branch. The decoupling structure disposed between the elements is a hybrid structure, which includes a protruded ground for the 2.4‐GHz WLAN band and a narrow slot etched on the ground plane for the 5‐GHz WLAN band. Moreover, to reduce the dimension of the protruded ground, two 8.2‐nH lumped inductors are embedded in the branches. The measured −10 dB reflection coefficient bandwidths are in the range of 2400‐2497 MHz and 5150‐5940 MHz. The measured transmission coefficient indicates that a good isolation higher than 20 dB over the two bands is obtained.
A novel single L‐shaped open‐end slot antenna for octa‐band metallic frame smartphones is presented. The antenna mainly comprises an L‐shaped open slot and a simple LC circuit. The slot is placed at the top of the ground plane which is excited by the 50‐Ω feedline with a band‐stop match circuit. According to the proposed feeding arrangement, the antenna can cover all dual‐wideband LTE/WWAN operations at 698‐960 MHz and 1710‐2690 MHz. A prototype antenna is manufactured and tested. Experimental results such as return loss, radiation patterns, and radiation efficiencies are also presented.
An LTE/WWAN monopole antenna with a compact size of 12.5 × 28.7 mm2 for smartphone applications is designed. The antenna is formed by an L‐shape driven branch, a parasitic shorting branch, and a band‐stop matching circuit. By capacitive coupling and loading a matching circuit, the antenna generates four resonant modes in the working bands. The band‐stop matching circuit is applied to enlarge the bandwidth of the low working band. The measured −6 dB impedance bandwidth of the presented antenna ranges from 683 MHz to 962 MHz and from 1632 MHz to 2710 MHz, covering LTE/WWAN eight‐band operation. Acceptable radiation performances are achieved over the working bands. The measured efficiencies are 45.4%‐61.2% and 44.5%‐66.4% and the measured gains are −0.6 dBi‐2.0 dBi and 0.07 dBi‐2.69 dBi in the low and high working band, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.