This paper presents a simple design of two-element antenna with circularly polarized (CP) reconfigurability for multiple-input multiple-output wireless local-area network (WLAN) applications. A MIMO element consists reconfigurable feeding network, CP source, and 2 × unit-cell metasurface (MS). By controlling the ON/OFF state PIN diodes, proposed system can operate in either right-hand (RHCP) or left-hand (LHCP) all ports, RHCP LHCP each port. For operating modes, exhibits good performance...

This paper presents a multi-element multiple-input multiple-output (MIMO) antenna with self-isolation and flexible characteristics. The primary radiators of the proposed consist multiple ellipse-shaped patches arranged in an H-plane configuration. Self-decoupling is achieved by simultaneously different operating modes on excited element (TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode) non-excited...

This paper introduces a two-element antenna array with dual-sense circular polarization, wideband operation, and high isolation characteristics. The consists of two conventional truncated corner patches an extra layer metasurface (MS) located above the radiating patches. overall dimensions proposed are 0.92 λ 0 × 0.73 0.05 element spacings 0.02 0.39 respect to edge-to-edge center-to-center spacings. For validation, measurements on fabricated prototype carried out. measured data demonstrate...

This paper proposes a compact design of dual-sense circularly polarized (CP) antenna for simultaneous transmit (Tx) and receive (Rx) communication systems. The primary radiating aperture the proposed is 2 × unit-cell metasurface (MS). MS excited by asymmetric patch in center, which acts as CP source whole structure. By properly tuning feeding positions, with high isolation can be achieved. For verification, an prototype dimensions 0.36λ 0.02λ (λ free-space wavelength at center operating...

ABSTRACTThis paper introduces a method to reduce mutual coupling in two-element multiple-input multiple-output (MIMO) antenna, which is significant challenge due the need for high isolation over wide frequency range with close element spacing. Previous works typically achieved within narrow bandwidth. The presents novel defected ground structure (DGS) modified I-shaped slot, effectively minimizes dual-sense MIMO circularly polarized (CP) antenna broader bandwidth than previous approaches....

By changing the refractive index of a lens antenna from positive value to negative value, shapes are changed convex concave. A thick is replaced by thin concave lens. In order examine electromagnetic performances, simulations effective. However, simulators useful for antennas limited. this paper, HFSS simulator utilized. Amplitude distributions electric fields in near field region obtained. Physical performances clarified.

This paper introduces the design of a circularly polarized metasurface-based antenna array for C-band satellite applications that owns broadband operation and high gain characteristics. The single radiating element comprises Y-shape patch an above-placed 2 × unit-cell metasurface. Further improvement in operating bandwidth broadside is achieved by arranging four elements configuration sequential-phase feed network. A prototype has been fabricated measured to validate feasibility proposed...

Developing a circularly polarized (CP) antenna with compact size while achieving good radiation characteristics for handheld radio frequency identification (RFID) readers is very challenging task. This paper presents two CP antennas size, high gain, and front-to-back ratio characteristics. These proposed designs consist of 2$\times$ 2 unit-cell metasurface are excited by Y-shaped patch. The first has overall dimensions 0.45$\lambda$$\times$ 0.02$\lambda$, where $\lambda$ the guided...

A compact MIMO antenna utilizing a metasurface (MS) is introduced for sub-6 GHz applications, offering wideband functionality and high isolation characteristics. Each individual element of the consists slot coupled with $2\times 2$ unit cells MS. To effectively reduce mutual coupling, metallic vias are occupied so that MS each grounded at certain points. The proposed stands out from other reported designs due to its simplicity in decoupling structure without requiring additional space, size,...

This paper introduces a two-element antenna array with dual-sense circular polarization, wideband operation, and high isolation characteristics. The consists of two conventional truncated corner patches an extra layer metasurface (MS) located above the radiating patches. overall dimensions proposed are 0.69 λ0 × 0.87 0.05 element spacings respectively 0.02 0.24 respect to edge-to-edge center-to-center spacings. For validation, measurements on fabricated prototype carried out. measured data...

The search for a simple meta-system with negative refractive index has attracted lot of attention recently. In this paper, we study transmission operating at 300 GHz by using "single-atom" metamaterials which were initially designed achieving permeability. nature the negativity is discussed extensively effective medium analysis and confirmed dispersion diagram.

The isolation of a multiple-input multiple-output (MIMO) antenna system with dual-sense circular polarization (CP) is investigated in this paper. This paper explains the coupling mechanism type and proposes simple decoupling structure for enhancement. proposed network then applied to CP MIMO antenna. results demonstrate that significant improve over wide operating bandwidth while keeping small element spacing.