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A novel planar monopole antenna for multiband operation is presented. The proposed antenna consists of an E-shaped patch and a 50 Ω coplanar waveguide (CPW) transmission line. There are two L-shaped slots cut out of the ground and one U-shaped slot out of the E-shaped patch. By etching the slots, band-rejected filtering properties in the PCS/WiMax bands are achieved. Analysis of the current distribution...
The influence of quantum dot (QD) density, uniformity and layer number on the 3 dB bandwidth of 1.3 mum InAs-InGaAs QD VCSELs is investigated by the small signal analysis of all-pathway rate equations. The dependence of bandwidth on the QD density is shown. Linearly dependence of bandwidth on the QD uniformity is demonstrated. High speed operation (> 10 GHz) of QD VCSEL emitting at 1.3 mum is predicated.
We present fabrication of 1.3-µm InAs QD-VCSELs and arrays. The output power of single VCSEL exceeds 1.2 mW. Modulation bandwidth of 2.65 GHz and 2.5 GHz are achieved for single-mode and multi-mode VCSELs. Maximum output power of 28 mW is demonstrated for VCSEL arrays with threshold current of 50 mA.
A new annular slot antenna (ASA) is proposed in this paper. The slot is perturbed to match the impedance of the fundamental and first-order modes of the annular slot. Results simulated using Ansoft HFSS are presented, which show that this new antenna can provide a dualband operation. The proposed ASA can be applied to IEEE802.11 WLAN systems.
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