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In the paper we presents a dual-open-slot antenna, with a overall size of 50 × 13 × 3.5 mm3. The antenna consists of a long-open-slot and a short-open-slot. The tail of the long-slot is bent for compact size. The dual-slot antenna is feed by an L-shaped microstrip line. The long-slot used in the 2.4GHz mode and short slot excitation in 5.2 GHz mode. The open slots are excited through the L-shaped...
A design of MIMO antennas using two monopole structures adding a neutral line connected to ground plane for achieving better isolation is proposed and examined. The antenna uses curved C-shaped arm to resonance the bands of IEEE802.11b/g/n; another arm extended on the feed achieves the bands of IEEE 802.11a application. The overall size of the design is 45×25×1.6mm3; the occupied area of the antenna...
In this paper, we address the problem of secure wireless information and power transfer in a large-scale multiple-input multiple-output (LS-MIMO) amplify-and-forward (AF) relaying system. The advantage of LS-MIMO relay is exploited to enhance wireless security, transmission rate and energy efficiency. In particular, the challenging issues incurred by short interception distance and long transfer distance...
In this paper, we address the problem of energy-efficient power allocation for secure communications in an amplify-and-forward (AF) large-scale multiple-input multiple-output (LS-MIMO) relaying system in presence of a passive eavesdropper. The benefits of an AF LS-MIMO relay are exploited to significantly improve the secrecy performance, especially the secrecy energy efficiency (bit per Joule). We...
In this paper, a printed monopole antenna with simple structure, small size, and easy to design is proposed. The antenna consists of a bent L-shaped monopole extended from the ground and an L-shaped strip connected to the feed line. The bent L-shaped monopole with an L-shape strip coupled to excited the low and high band. By proper adjusting the parameters of the antenna, an antenna for WLAN application...
In this paper, we present a coupled-fed meandered loop antenna on a planar structure. The antenna is fabricated on the FR4 substrate of thickness of 1.6mm and permittivity of 4.4. The antenna with a total size of 30 mm × 13.75 mm × 1.6 mm is feed by a 50 Ohm mini-coaxial line. By using an L-shaped monopole connected on the coaxial line and the meander loop to generate multiple modes to form the required...
The gap source model is extensively used in modeling monopole antennas in the method of moments(MOM), due to its simple expression form. But it is not accurate to calculate the input impedance then, the advanced delta-gap source model can solve this problem. Instead of using a shorted-circuited conductor to represent a zero-width exciting gap according to the conventional method, the approach is then...
In this paper, a new middle-feed printing dipole is designed. To obtain the working frequency bandpsilas best standing wave, some special parameters of the antenna was studied emphatically. After then, the influence of the radome on antennapsilas characteristics is discussed through the whole systempsilas VSWR. At last, by using the microwave network theory, the antennapsilas radome is devised.
In this paper, we present a closed-loop STTD scheme using limited feedback unitary precoding for MIMO-OFDM-OSTBC systems, which supports different numbers of transmit antennas. The simulation results show that adopting the STTD scheme in MIMO-OFDM-OSTBC system can obtain higher diversity advantage. Compared with other STTD schemes, the proposed scheme is more flexible in practical application, allows...
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