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Novel miniaturized two-layer electromagnetic band gap (EBG) structures are presented for reducing the electromagnetic coupling between closely spaced ultra wideband (UWB) planar monopoles on a common ground. The proposed EBG structures employ two closely coupled arrays, one comprising linear conducting patches and the other comprising apertures (slits) in the ground plane. The two arrays are printed...
Double-layer miniaturised structures are presented for reducing the mutual coupling between two closely spaced CPW-fed printed monopoles. The proposed structures employ two closely coupled layers, one made of conducting patches and another made of apertures (slits) in a ground plane. They are placed on either side of a very thin supporting dielectric substrate (55μm) with a rotation of 90° between...
Double-layer miniaturised structures are presented for reducing the mutual coupling between closely spaced PIFAs on a handheld device ground plane. The proposed structures employ two closely coupled layers, one made of conducting linear patches and another made of apertures (slits) in a ground plane. They are placed in very close proximity to each other (55µm) with a rotation of 90° between the elements...
A novel solution for reducing the mutual coupling between two closely packed Planar inverted-F antennas (PIFAs) positioned on a compact ground plane is presented. A single miniaturised convoluted slit with optimised dimensions is introduced between the two PIFAs. The presence of the slit leads to a significant reduction of the mutual coupling in the antennas' operation frequency band. The proposed...
A novel technique for reducing the electromagnetic coupling between closely spaced MIMO antenna arrays on a compact ground plane is presented. The proposed ground plane introduces pairs of miniaturised convoluted slits between two PIFAs resulting in a significant reduction of the mutual coupling within their operating frequency band. The proposed slits have a small footprint and are positioned close...
Diversity-multiplexing tradeoff (DMT) of asymmetric two-user full-duplex cooperative multiple-access (CMA) channels with multiple-antenna terminals is studied. The channel is asymmetric in the sense that the users are not restricted to have the same multiplexing and diversity gains. Using the network capacity cut-set bound, we first derive the DMT upper bounds of a general K-user CMA channel. Following...
The isolation of closely spaced monopole antennas and PIFAs on a compact ground plane, resembling that of a mobile handset or wireless router, is studied. Significant isolation enhancement is achieved by introducing novel pairs of optimised slits in the ground plane. By properly choosing the length and separation distance of the proposed slits, they are made to resonate within the operating bandwidth...
This paper investigates the problem of resource allocation in spatial multiuser access cognitive OFDM (orthogonal frequency division multiplexing) systems. The objective is to maximize the cognitive users' weighted rate sum, which is constrained by the licensed users' (LU) interference temperatures. The spatial multiuser access using singular value decomposition (MU-SVD) model is introduced to the...
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