This article presents a wideband orthogonal-mode dual-antenna pair with shared radiator for fifth-generation (5G) multiple-input multiple-output (MIMO) metal-rimmed smartphones. The decoupling property of the is realized by combination orthogonal monopole/dipole modes in lower band and slot/open-slot higher band. With design scheme, shows wide impedance bandwidth 3.3-5.0 GHz high isolation more than 21.0 dB across entire without using any external structures. By arranging four such pairs at...

A novel electromagnetic-bandgap (EBG) structure in a fork-like shape is investigated. This has an extremely compact size. comparison been carried out between the new and conventional mushroom-like EBG structure. Simulations experimental results have verified that area of less than 40% latter. The presented also provides additional degree freedom to adjust bandgap position, which applied design reconfigurable multiband Several application examples demonstrated, including double-element...

A novel dual-band printed diversity antenna is proposed and studied. The antenna, which consists of two back-to- back monopoles with symmetric configuration, on a circuit board. effects some important parameters the are deeply studied design methodology given. prototype operating at UMTS (1920-2170 MHz) 2.4-GHz WLAN (2400-2484 bands provided to demonstrate usability in for mobile terminals. In above bands, isolations larger than 13 dB 16 dB, respectively. measured radiation patterns general...

A substrate integrated waveguide (SIW)-fed circularly polarized (CP) antenna array with a broad bandwidth of axial ratio (AR) is presented for 60-GHz wireless personal area networks (WPAN) applications. The widened AR an element achieved by positioning slot-coupled rotated strip above slot cut onto the broadwall SIW. 4 × designed and fabricated using low temperature cofired ceramic (LTCC) technology. metal-topped via fence introduced around to reduce mutual coupling between elements array....

A dual-polarization coplanar waveguide (CPW)-fed slot antenna is proposed in this letter. By exploiting the even and odd modes of a CPW structure, two orthogonal polarizations can be excited aperture by same feeding CPW, which results compact design with very good isolation between ports. The -10-dB reflection coefficient bandwidths are 670 MHz (27.9%) for one polarization 850 (35.4%) other, ports WLAN band better than -32.6 dB. radiation pattern efficiency also measured, data compared...

A design methodology for a concurrent dual-band Doherty power amplifier (PA) with frequency-dependent backoff ranges is presented in this paper. Based on T-shaped network and coupled line network, different components needed PA topology, including 3-dB branch-line coupler, an offset line, quarter-wavelength transformer, are developed. Two prototypes balanced imbalanced range modes implemented to verify the feasibility. Continuous wave signal test results show that proposed successfully...

A folded loop-inverted F reconfigurable antenna for mobile phone applications is designed and the obtained results are discussed in this communication. It shown that loop mode an inverted (IFA) controlled by only one p-i-n diodes with simple bias circuit. The impedance can be matched adopting a matching bridge both IFA modes. In compact volume of 60 × 5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , proposed operates hepta-band,...

In this paper, a novel broadband Doherty power amplifier based on the continuous-mode technique (C-DPA) is proposed. The focused manipulating harmonic components in (DPA) structure to achieve improved bandwidth and efficiency. conventional DPA, isolation typically required between two transistors prevent them from modulating each other at frequencies. However, as presented such not actually necessary. On contrary, by allowing modulate frequencies with help of properly designed postharmonic...

In this paper, we propose a beam-oriented digital predistortion (BO-DPD) technique for power amplifiers (PAs) in hybrid beamforming massive multiple-input multiple-output (MIMO) transmitters, which can achieve linearization of the transmitted signal main beam direction and address DPD implementation issue array. MIMO conventional to linearize each PA is impractical implement that number chains less than PAs; however, BO-DPD resolve by constructing linearizing “virtual” rather single PAs....

A horizontally polarized omnidirectional planar loop antenna that employs an artificial mu-negative transmission line (MNG-TL) is proposed. The MNG-TL designed using periodically loaded parallel-plate lines. reactive loading inspired by the zeroth-order resonator (ZOR), which has a propagation constant of zero. Due to unique property infinite wavelength, presented in this paper allows current along remain phase so horizontal pattern generated. series-fed array, composed four antennas and...

An omnidirectional dual-polarized antenna with high port isolation is presented for 2.4-GHz wireless local area network (WLAN) applications. The patterns of both vertical and horizontal polarizations in the azimuthal plane are achieved by positioning two orthogonal slots cut onto walls a slender columnar cuboid. overall volume proposed only 83 × 11 11mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> (0.664λ <sub...

The behavior of a mobile handset chassis-mode antenna with metal bezel is analyzed in this paper by utilizing the theory characteristic modes (TCM). Two eigenmodes, one from chassis (0.5λ-dipole mode) and other (1λ-perimeter mode), are merged monopole exciter to broaden bandwidth below 1 GHz. A new eigenmode (1.5λ-perimeter also exploited achieve multiple-input multiple-output (MIMO) performance. characteristics verified an experimental prototype measurements. measured input reflection...

A polarization reconfigurable slot antenna with a novel coplanar waveguide (CPW)-to-slotline transition for wireless local area networks (WLANs) is proposed and tested. The consists of square slot, CPW-to-slotline transition, two p-i-n diodes. No extra matching structure needed modes transiting, which makes it much more compact than all reference designs. -10 dB bandwidths an implemented bias circuit are 610 (25.4%) 680 MHz (28.3%) vertical horizontal polarizations, respectively. radiation...

Abstract-In this letter, a novel hybrid-fed circular patch antenna operating with TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> and xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes is presented. By making use of hybrid feed network, the two can be operated at an overlapped frequency range for 2.4-GHz WLAN applications, while mode reveals good broadside radiation patterns shows monopole-like patterns. The proposed...

A compact dielectric resonator antenna (DRA) for broadband applications is proposed. By applying an optimized asymmetrical T-shaped (DR) and inverted-trapezoidal patch as a feeding mechanism, impedance bandwidth of about 75.1%, covering the frequency range from 3.81 to 8.39 GHz, obtained. The volume proposed DRA without ground plane 0.555 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> <sup...

In this communication, we have proposed a compact planar antenna for isotropic radiation pattern in wide operating band. The consists of four sequential rotated L-shaped monopoles that are fed by uniform sequential-phase (SP) feeding network with equal amplitude and incremental 90 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> phase delay. Based on the field method, full spatial coverage gain deviation less than 6 dB is achieved band...

This paper gives a feasible and simple solution of generating OAM-carrying radio beams. Eight Vivaldi antenna elements connect sequentially fold into hollow cylinder. The circular array is fed with unit amplitude but successive phase difference from element to element. By changing the at steps 0, ±45°, ±90°, ±135°, 180°, OAM beam can be generated mode numbers ±1, ±2, ±3, 4. Simulations show that states ±2 ±3 are same as traditional states, while 4 differ boresight. phenomenon explained by...

In this letter, a planar microstrip crossover junction is presented. The conductor-backed coplanar waveguide (CB-CPW) structure with vias employed as the core part of design. dimensions CB-CPW itself are 11.3 × mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Two kinds transitions between line (MSL) and merged into double side print circuit board. This presented has bandwidth from 10 up to 6000 MHz for 20 dB return loss, 1 insertion...

A novel null scanning patch antenna operating at 2.4 GHz is presented. Unlike the existing reconfigurable techniques, even and odd modes of a shorted are adopted to first achieve broadside pattern on broadside. Continuous achieved by combining these two with different exciting powers. The mechanism discussed from both theoretical analysis simulated/measured results. rat-race switching network used excite simultaneously obtain high port isolation. prototype fabricated tested. measured results...

A wideband printed dipole with V-shaped ground branches is proposed, which designed for multiple-input multiple-output (MIMO) antennas. It based on a an integrated balun, and are introduced to improve the impedance matching. The bandwidth of this element reaches 62.3% (2.30-4.40 GHz), covers all three WiMAX bands (2.30, 2.50, 3.30 GHz) 2.40 GHz WLAN band. Based element, quad-element MIMO antenna fabricated. By reusing structure between adjacent elements, size only 0.31 λ × 0.31λ 0.01λ....

In this letter, a low-profile microstrip antenna with strip-slot hybrid structure is proposed to enhance the bandwidth up 41% within height of 0.06 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (λ center operating wavelength in free space). The consists four strips, which are separated by three narrow slots. By controlling dimensions strips and slots, dual modes, i.e., TM xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode...

This paper presents a fully integrated C-band Doherty power amplifier (DPA) based on 0.25-μm GaN-HEMT process for the 5G massive MIMO application. The performance degradation caused by nonlinear output capacitance is analyzed, and novel compensation technique proposed. A low-Q network employed to broaden bandwidth, its insertion loss in back-off region demonstrated be mainly decided Q-factor of drain bias inductor main PA. Hence, adopting on-chip transmission lines with high Q-factors...

A compact two-element antenna with both pattern and polarization diversities high isolation for 2.4 GHz WLAN application is reported. The composed of a low-profile monopole pair inverted-L antennas fed by 180deg out-of-phase excitations. prototype fabricated the measured S-parameters radiation patterns are presented. better than 29 dB across required bandwidth. envelope correlation coefficient, mean effective gains diversity gain calculated to evaluate potential proposed antenna.

A tripolarization and low-profile planar antenna is designed, prototyped, tested for WLAN application. The developed three-port provides three orthogonal polarization radiations. Two slot-coupled microstrip antennas a disk-loaded monopole are integrated into one structure. total height of the 5.8 mm. Obtained gain two directive elements at 2.42 GHz 7 dBi, while omnidirectional element 2.5 dBi. bandwidths 2.352.52, 2.32.54, 2.382.49 GHz, respectively. Simulation results radiation patterns...

A dual-band circularly polarized (CP) rotated patch antenna is proposed in this letter. Dual-band CP operation of the achieved by adopting a circular below rectangular patch. The extra not only provides higher band, but also employed to tune operating frequency lower which generated and can be arranged on front back thin substrate fed single slot. dual bands tuned separately with small ratio 1.18. prototype built validate design strategy. measured 3-dB axial-ratio (AR) bandwidth 2.1%...