This article presents a novel triband dual-polarized shared-aperture antenna with frequency-selective function for sub-6 GHz base station applications. The proposed is composed of square loop two parasitic loops 2G/3G/4G (1710-2690 MHz) and differentially fed planar 5G (3300-3600 4800-5000 These antennas are placed coaxially but different altitudes saving the installation space. In order to achieve good individual performance these in same aperture without interference or blocking, lower...

In this communication, a dual-band aperture-shared antenna array (ASAA) is developed for base station. This ASAA contains 4 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> high-band (HB) array, which operates from 3.4 to 3.8 GHz, and low-band (LB) antenna, 0.69 0.96 GHz. For decreasing pattern distortion of HB due the induced current in LB element, method following two...

Under the dual impact of urbanization and ecological crisis, rural resilience research can improve system’s level resisting external pressure restoring balance provide a new perspective for sustainable development. This study establishes measurement system in Weiyuan based on PSR framework, evaluates 2021 using entropy method GWR model detects its driving factors. The results show that (1) spatial characteristics diverge significantly, with three southern forest farms being higher overall...

An overview is given for the development of dielectric-resonator antennas. A detailed analysis and study hemispherical structure, excited by a coaxial probe or slot aperture, then given, using dyadic Green's functions pertaining to an electric-current source magnetic-current source, located in dielectric sphere. The integral equation antenna (DRA), either obtained. solved method moments. characteristics, such as input impedance, radiation patterns, directivity, efficiency, are computed...

This paper presents the design of dual circularly polarized (CP) series-fed arrays based on sequential rotation (SR) technique with uniform radiation elements. The elements and feeding network used in array are uniform, which leads to possibility dual-CP by SR arrays. Meanwhile, radiate unequal powers due this arrangement. relationship between axial ratio four key parameters is derived thoroughly discussed. Good polarization purity port isolation can be realized optimizing these parameters....

This communication presents a beam-deflection short backfire antenna (BD-SBA). The proposed BD-SBA differs from the conventional SBA in that main reflector of is phase-modulated metasurface instead perfect electric conductor (PEC). phasemodulated consists 15 columns unit cells which are designed to change phase reflected waves. Therefore, beam can be deflected certain angle. First, several BD-SBAs with linear metasurfaces studied, indicates antennas point at different directions. Second,...

A multiple beam parasitic array radiator (MBPAR) antenna is proposed in this letter. The MBPAR can cover all angles horizontal plane by generating six wide beams with angle-step of 60° 2.4 GHz wireless local area network (WLAN) bands. consists active elements, a center reflector, twelve isolation and ground structure. Six elements located the edge use common reflector to realize beams. on angular bisectors are used improve between adjacent ports. Unlike traditional electrically steerable...

A more rigorous model of the probe-fed hemispherical antenna than that K. W. Leung et al. (1991) is considered. This accounts for all possible azimuthal modes can be excited by this structure. The input impedance computed a dielectric sphere radius a=2.54cm, /spl epsi//sub r1/=8.9, and loss tangent 0.0038.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A broadband electrically steerable parasitic array radiator (ESPAR) antenna is presented. The proposed ESPAR consists of an active monopole, 12 sleeve wires, 6 elements and a ground structure. By introducing the wires into antenna, operation bandwidth broadened effectively. Six copper placed around circular plane constitute skirt antenna. skirt, with low wind resistance, reduces elevation angle radiation beam. operating at 2.2 GHz designed fabricated. From results, impedance bandwidth, 2...

A compact Rotman lens is presented in this paper. The consists of a body and truncated ports with the energy distribution slots. By truncating long triangular transitions traditional lens, lengths are reduced effectively. However, impedance discontinuity problem caused by transition. To solve problem, slots designed between feed lines apertures. slot evolved from 1-2 power divider, which creates transition process for wave propagating realizes good match lines. validate proposed design, 4×7...

This letter proposes a miniaturization design of Rotman lens using array port extension technique. The ports the proposed 4 × 12 are extended from an initial 7 through (PE) network to achieve smaller equivalent body. and topology for PE designed based on analysis phase distributions along when different beam excited. allows all pointing angles be consistent before after at center frequency. A prototype working X-band was fabricated. measured results show that matched well, high isolations...

In this article, a dual-band shared-aperture parasitic array radiator (DS-PAR) antenna is presented to cover 2.4-GHz WLAN lower-band (LB) and 5-GHz wireless local area network (WLAN) higher-band (HB). The proposed uses elements shared by both frequency bands, thus achieving the aperture of array. comprises active for two elements, reflective plate, ground plane. have different functions in bands. reflection HB can be used LB achieve impedance matching optimize half-power beamwidth. With...

A beam‐deflection short backfire antenna (BD‐SBA) is proposed. The BD‐SBA consists of an SBA and a deflection plate. plate designed to change the phase reflected waves, hence deflecting beam BD‐SBA. can realise different pointing within about 20°. An X‐band (10 GHz) with 12° fabricated tested. measured results demonstrate that desired obtained. gain 14.3 dBi sidelobe level −20.6 dB are realised. BD‐SBA, simple structure, low cost moderately high gain, suitable for application...

This paper describes the study of array short backfire antenna (SBA) and different effects on radiation pattern array. The elements are hexagonal SBA with substantially higher aperture efficiency or gain than conventional in an application. A designed three-element which is arranged honeycomb exhibits a directive 17.6dBi sidelobe level (SLL) -22.5 dB at 38.5 GHz voltage standing wave ratio (VSWR) 1.28.

A Rotman lens is designed in this paper. The shape of the body and ports location based on Genetic Algorithm. By using Algorithm, has a good performance insertion loss phase error. with 5 beam ports, 9 array some dummy Algorithm at 2.45 GHz. simulation results demonstrate that power efficiency error are improved effectively.

&lt;p&gt; A reconfigurable partially reflective surface (PRS) antenna can offer low-cost and low-complexity beam steering, traditionally implemented using a phased array with bulky feeding network. This paper utilizes ray-tracing to prove analytically that an inductive nonuniform PRS facilitates larger deflection lower sidelobe level (SLL) than capacitive one, given the same reflection phase difference. With suitable tradeoff in angle gain variation between states, is designed for ±13°...

&lt;p&gt; Dual-band shared-aperture Fabry-Pérot cavity (DS-FPC) antennas with single-layer partially reflective surface (PRS) are inherently limited in the achievable frequency ratio. This paper analyzes such to derive feasible range of ratio and thereafter proposes a dual-band antenna that can fill gap. The proposed integrates short backfire (SBA) for low band (LB) (FPC) high (HB), utilizing shared PRS parasitic element. In LB, using element is transparent HB, SBA works well despite its...

&lt;p&gt; Dual-band shared-aperture Fabry-Pérot cavity (DS-FPC) antennas with single-layer partially reflective surface (PRS) are inherently limited in the achievable frequency ratio. This paper analyzes such to derive feasible range of ratio and thereafter proposes a dual-band antenna that can fill gap. The proposed integrates short backfire (SBA) for low band (LB) (FPC) high (HB), utilizing shared PRS parasitic element. In LB, using element is transparent HB, SBA works well despite its...

&lt;p&gt; A reconfigurable partially reflective surface (PRS) antenna can offer low-cost and low-complexity beam steering, traditionally implemented using a phased array with bulky feeding network. This paper utilizes ray-tracing to prove analytically that an inductive nonuniform PRS facilitates larger deflection lower sidelobe level (SLL) than capacitive one, given the same reflection phase difference. With suitable tradeoff in angle gain variation between states, is designed for ±13°...

This letter presents a wideband slim monopole antenna operating on very-high-frequency (VHF) and ultra-high-frequency (UHF) bands. The is composed of strip meander line loading. vertically mounted the case radio station which served as ground modified with slots. method characteristic mode analysis (CMA) used to design proposed antenna. By loading line, resonant frequency 1 moves lower band higher modes are effectively excited at band, leads wide impedance bandwidth. Moreover, by slots case,...

In this article, a method on suppressing cross-band scattering effect of dual-band dual-polarized shared-aperture antenna is proposed. The consists lower-band (LB) element and 2 × higher-band (HB) array. proposed LB radiator pair crisscross-shaped dipoles using sparse frequency selective surface (SFSS) which composed rectangular ring inner patch. This exhibits wave-transparent reducing blockage interference for HB array achieving reduction the radiation pattern distorting from scattering....