Two ground radiation antennas with polarisation diversity performance were proposed for MIMO WLAN applications in wearable devices. The can simultaneously excite the vertical mode and horizontal of plane phase difference between two modes be controlled by utilising an inductor‐loaded metal strip plane, generating circular polarisation. A 3:1 VSWR bandwidth 140 MHz high isolation (above 17 dB) a 3 dB axial ratio 100 was obtained. opposite rotations generated resulted good performance, which...

This study proposes a novel receiving antenna with higher upper hemisphere efficiency for global navigation satellite systems (GNSS) applications. The proposed and new-loop-type consists of series capacitor input impedance adjustment two shunt capacitors resonant frequency control. method is based on the excitation horizontal mode ground plane to improve efficiency, thus achieving high-reception performance such as good signal-to-noise ratio isotropic sensitivity. was verified in both...

This study investigates a compact and straightforward self-decoupled 2 × multiple-input multiple-output (MIMO) antenna set its applications for current future 5G terminal devices. The proposed MIMO antennas include popularly used loop looptype ground-radiation without utilizing any supplementary decoupling structures or undergoing complex tuning process. It is revealed that the can be modeled as an electric-current element magnetic-current element, respectively. orthogonality allows...

In this letter, we construct a novel compact multi-resonance antenna structure using the ground radiation technique to achieve intended target frequencies of 2.4–2.5 GHz and (5.125–7.125 GHz) Wi-Fi 6/6E dual-band. According measurement results, under 3:1 voltage standing wave ratio, proposed achieved bandwidth 450 MHz (ranging from 2.20 2.65 in lower band, maintaining an average total efficiency 60.7% 2.4 2.5 GHz. Furthermore, 2,640 4.81 7.45 was higher with being 53.4% 5.0 7.125 The...

A compact and easy to fabricate decoupling method is proposed yield high isolation for the multiple‐input multiple‐output (MIMO) ground radiation antenna (GradiAnt) system. The MIMO system comprised of two symmetrical, closely spaced, loop‐type (GradiAnts) with a ground‐coupled isolator inserted between them. can be seen as series resonant circuit which connected lumped components control decoupling. In GradiAnt system, coupling null induced due isolator, effectively used enhancement...

A metal-rimmed multiple-input multiple-output (MIMO) antenna design operating below the 1 GHz frequency band is proposed that offers a wide bandwidth, high isolation, low correlation, and compact size. The technique based on mobile phones with four gaps, overall occupies small size in ground plane. Orthogonal mode resonances are controlled to be equal frequencies, providing performance good diversity performance. main achieved by utilizing upper-side rim tune resonance along length of plane...

This study investigated the decoupling mechanism of capacitors in multiple-input multiple-output (MIMO) antenna designs based on characteristic mode analysis (CMA). First, a two-port single-loop antenna, where shunt capacitor elements were used to obtain high port-to-port isolation properties, was analyzed. CMA revealed that capacitors' lies modal superposition original radiation (Mode-2) and manipulated high-order (Mode-3) with anti-phase current distributions. Accordingly, compact...

In this communication, we introduce a mode-controlled ground radiation antenna comprised of resonance-controlled plane and nonradiating feeding slot for wideband applications in mobile devices. A 110 mm × 50 850-MHz operation is studied as test case. The resonant frequency the lowered by adding metal loads at top bottom intended strong coupling with miniature located one end, so that half wavelength dipole-type radiator. can be structures strips, plates, or wires, they take form broken rims...

This letter investigates the intrinsic operation principles of decoupling inductors in multiple-input–multiple-output (MIMO) antenna design using characteristic mode analysis, first its kind. work starts with analysis a conventional one-wavelength loop and then MIMO methods terminal scenarios. It is revealed that introduce new within band, contributing to current-mode-canceling effect responsible for port-to-port isolation. A two-in-one common-loop high-isolation characteristics proposed...

A ground radiation antenna with tunable metal loads is proposed to improve the performance of a normal at 900 MHz for Z ‐wave applications. The design comprised 5 mm × and inductor‐connected in 30 50 plane. can take form rims, frame, strips, or wires ends plane are connected lumped elements allow easy adjustment. was simulated tune loads, then fabricated measured verify its improved band.

Here, we propose a ground radiation antenna (GradiAnt) with circular polarization (CP) by applying the ground-mode tuning (GMT) technique to plane. We demonstrate that GradiAnt at an arbitrary location of plane can simultaneously excite two orthogonal modes same magnitude, and phase difference between be adjusted via GMT achieve CP in mobile antennas. The proposed viewed as combination electric coupler (J-type) magnetic (M-type) plane, both excited amplitude coupling-type. GMT, applied using...

This paper investigates the design of a compact multiple-input multiple-output (MIMO) ground-radiation antenna system for 5G terminal devices. Ground-radiation antennas are small loop-type resonators that can excite ground plane as radiators while having advantages size and convenient tunability, but their MIMO systems remain unsolved issues. In this study, novel straightforward decoupling technique based on closed-decoupling-loop is presented applications in first its kind. The proposed...

In this communication, we introduce a high-sensitivity antenna system for Bluetooth headsets dealing with the numerous and unidentified noises in printed circuit board (PCB). This is composed of ground radiation applications an adjacent slot noise suppression. A loop-type used to model source on PCB provide wide-frequency spectrum currents analyze performance system. Decoupling between sources port can lead high sensitivity. An designed as part improve sensitivity, based decoupling theorem....

A small loop antenna for WLAN applications is proposed, which comprised of an inverted‐L and inner rectangular achieving dual‐band resonances within a compact size 4.5 mm × 6.5 mm. series capacitor in the feeding employed impedance matching both bands shunt high band, respectively. The proposed able to achieve −10 dB bandwidth 120 1260 MHz average radiation efficiency 69 61% 2.4 GHz band 5

This paper investigates the design of a novel single-feed dual-element antenna that can be used to achieve circular polarization (CP) performance for mobile devices at arbitrary locations. The severe conditions needed CP remain as difficult issues small antennas; this is case because ground plane, rather than structure, contributes dominant radiation volume shrinks. A concept decomposing into two elements, which are independently coupled orthogonal modes far-field radiation, proposed through...

A triple‐band ground radiation antenna is proposed that can cover the 1575 MHz global positioning system (GPS) band and 2.45 5.5 GHz WLAN bands, within a 6 × 9 mm clearance. The comprised of two inner rectangular loops, each enclosed by larger outer loop. Each be adjusted for impedance matching means respective circuits. −10 dB return loss bandwidths were simulated to 17, 130 1000 MHz. Measurements indicated sufficient bandwidth good performance also achieved.

A circularly polarized loop-type ground radiation antenna using a mode tuning (GMT) structure is proposed for Internet of Things (IoT) devices. The designed to excite two orthogonal modes equal magnitude on the plane. GMT consists an inductor and metallic strip that has been installed at edge plane obtain 90° phase shift between modes. generates left-hand waves in +z-direction right-hand −z-direction. was fabricated validate simulation results. measured −6 dB bandwidth 150 MHz axial ratio...

This paper studies an isolated ground-radiation antenna (iGradiANT) that has inherent isolation with another closely-located element and demonstrates its applications in 5G multiple-input multiple-output (MIMO) array. The proposed iGradiANT is accomplished by merely employing a small out-of-ground loop into traditional (GradiANT). Hence, contrast to the GradiANT, can simultaneously support in-ground loop-type current mode mode, responsible for far-field radiation near-field energy...

A simple and efficient antenna technique for both single multiple‐input multiple‐output (MIMO) design utilising an unbroken metal rim is analysed in the frequency band <1 GHz mobile phone applications. 110 mm × 55 5 has two characteristic modes (Modes 1 2) that resonate around GHz, these are quasi‐degenerate orthogonal to each other. An uncontacting feeding structure proposed excite utilise of radiation. In MIMO design, it possible achieve high isolation good diversity performance by...

This study presents a dual-port single-dipole MIMO antenna pair, which is accomplished by selectively exciting the dominant dipole-type current mode and second higher of single suspended metal strip. A magnetic coupling method based on feeding loop implemented at maximum portion strip, such that strip operates as half-wavelength dipole radiator. An electrical capacitor, otherwise, excites wavelength this resonance further controlled tuning capacitor. In way, involves both antennas operate...