In this paper, multiband antennas based on a single ring slot are proposed for 4G/5G smartphone applications. The basic structure of the antenna is consisted large metal ground and an unbroken rim, in which 2 mm-wide slots realized between rim. Here, reconfigurable 4G (820-960 1710-2690 MHz) initially devised by loading multiple grounded stubs simple dc controlling circuit with varactor diode into upper section slot. To further cover sub-6 GHz spectrum (3400-3600 future 5G communications,...

In this article, a new self-decoupling method, namely weak-field-based decoupling technique, is proposed and validated based on inset-fed patch antenna arrays. The effect realized by taking advantage of the inherent weak-field area created feeding structure patch. By strategically arranging array element in adjacent element, coupling strength between elements can be controlled under very low level without need any additional circuitry or structures. A two-element was first developed...

A low-cost $1 \times 4$ phased array incorporating continuously tunable substrate integrated waveguide (SIW) phase shifters is presented in this paper. Through seamless integration between antenna elements, shifters, and an SIW feeding network, the proposed assembled a multilayered monolithic structure. To obtain wide variation range, electronically controllable shifter constructed by introducing varactor diodes into reflection-type architecture, which can also offer simple solution to...

In this paper, a dual-polarized frequency-reconfigurable mm-wave patch antenna array is described. The design incorporates varactor diodes symmetrically loaded onto the four corners of square patch. Parallel plate series capacitors are constructed to achieve required low total capacitance by moving an inner layer. Additionally, novel dual-function shorting vias implemented into structure, which serve as RF choke for providing dc-bias voltage varactors, and behave shunt inductive loadings...

A new planar microstrip balun with two operation bands is presented and investigated in this letter. Originated from the traditional Marchand balun, proposed dual-band designed on a symmetrical four-port network one shortcircuited port. Derived equations design charts show that frequency ratio (m = f2/f1) of these could be flexibly controlled wide range 2.0-4.6. Moreover, inherent transmission zeros nearby each band have been introduced into aiming to improve selectivity. For verification,...

A reconfigurable beam-scanning substrate integrated waveguide (SIW) cavity-backed slot antenna (CBSA) is presented. By adopting three transverse radiating slots and inserting four pairs of postloaded varactors, the field distributing in SIW cavity can be moderately perturbed. To specific, two flanked by adjacent slots, are placed vicinity longitudinal centerline; while other symmetrically embedded at end parts bilateral slots. As such, manipulating biasing voltage applied to each pair...

A beamwidth reconfigurable linear array antenna utilizing three magneto-electric (ME) dipole elements with no need for a complex feeding network is presented. In this design, the ME are differentially excited by parallel transverse resonant slots etched on broad wall of substrate integrated waveguide (SIW) cavity. By symmetrically embedding four copper posts that connected to varactor diodes between adjacent slots, electric field perturbation in SIW cavity can be realized manipulation...

In this paper, we present a dual-polarized frequency-reconfigurable patch antenna working at millimeter wave frequency bands for 5G applications. A square is surrounded by four metallic L-shaped walls. Four ideal varactor diodes are placed between the corners of and Frequency tunability achieved adjusting capacitances diodes. Two 50-Ω probes used to feed which can excite two orthogonal polarizations. Operating vary from 23 GHz 45 with 10-dB return loss when capacitance decreases 0.05 pF...

We propose a flexible cluster array concept utilizing diverse antenna elements and the mutual coupling among them to improve spherical coverage. This innovative approach can not only enhance impedance matching but also beamforming performance across wide frequency band by adjusting excitation amplitudes phases. Equations are derived achieve specific objectives such as minimizing total active reflection coefficient or maximizing realized gain of an array. To validate concept, we employ...

In this article, a dual-polarized (DP) endfire antenna array is proposed for the 5G smartphone applications. The covers all five defined millimeter-wave (mm-wave) frequency bands, namely n257, n258, n259, n260, and n261, which are used mobile communications. Electrical dipole to achieve horizontal polarization (HP), parasitic element included bandwidth enhancement. A shorted-patch functions as magnetic facilitating vertical (VP). Additionally, broadband operation realized by novel stacked...

In this paper, we present an antenna cluster concept operating in millimeter-wave (mm-Wave) frequency bands for 5G applications. Unlike conventional arrays made up of identical elements, a array is constructed using non-identical dipoles with high coupling that are placed 2-mm wide slot. The cumulative distribution function (CDF) the spherical coverage gain used to evaluate beam-forming capability. High over band can be achieved by adjusting amplitudes and phases excitation vector. To...