A wideband frequency diversity printed-Yagi antenna array is presented. The operating band of the single port L-/S-bands element can be selected by changing states p-i-n diode switches. Land S-bands work independently. 4 × S-band constituted to a 2 L-band modifying apertures. This operates at 1-2 GHz/2-4 GHz in with fractional bandwidth 66.7%/66.7%, which translated into an overall tuning ratio 4:1. spacing adjacent elements each reconfigurable mode less than 0.72λ <sub...

Based on a polarization twist reflector, novel single-fed high-power and phase-adjustable array element is presented. Without complicated feeding network, the simply excited by balanced-fed dipole. By rotating of driven dipole, can provide continuous linear phase in far-field region. With property, be substitute for digital shifter. In addition, field distributions are analyzed through simulation, which prove its advantage high power-handling capacity. The proposed also used to form an 8 ×...

A dual-band circularly polarized (CP) antenna with wide half power beamwidths (HPBWs) for compass navigation satellite system (CNSS) applications is proposed in this paper. The CP radiation realized by feeding four sequentially rotated U-shape patches shorted to the ground at both ends of them a 90° phase difference network. Loading parasitic arc-shape one end provides operation. Experimental results show that exhibits two overlapped impedance and axial ratio relative bandwidth 2.8% 3.3%....

A novel compact wideband circularly polarized (CP) directional loop antenna is presented in this article. The formed by an inner with periodic capacitive loading and outer concentric loop, both of which are placed on the top side a dielectric substrate fed nonradiating slots. traveling-wave feed network adopted to excite slots, thereby providing loops currents same magnitude appropriate phase delay. Thus, stable symmetrical CP radiation achieved. In addition, wrapped lower cylindrical...

A frequency reconfigurable antenna array is presented. The consists of eight arms with two different feed networks. By controlling PIN diode switches, high four dipole elements and low can be obtained, respectively. Resonant frequencies within the ranges 1.0–2.5 GHz (Case I) 2.5–6.0 II) achieved, which translates into an overall tuning ratio 6:1 (1.0–6.0 GHz) for array. proposed simulated, fabricated, tested good agreement between measurements simulations.

In this article, a 1 × 4 wideband, dual-polarized patch antenna array fed by novel, differentially structure is proposed. The of the was realized parallel line that printed on PCB and connected with inner outer conductors coaxial cable. This method elaborately solved problem narrow bandwidth conventional microstrip differential feeding. By using relatively thick air substrate (thickness = 0.19 λ0), stacked patches, coupling feeding structure, novel design, element introduced below operated...

In this paper, a co-aperture dual-polarized antenna array is proposed. The frequency band covers the P-band (0.4–0.7 GHz) and X-band (9.3–9.9 GHz). designed in form of an all-metal Vivaldi, while minimizing impact structure on electrical performance. final profile design for dual-band only 0.12 λ0 (λ0 corresponds to wavelength 0.4 adopts miniaturized waveguide slot structure, which can be well embedded structure. order verify feasibility scheme, prototype processing testing were carried out,...

Programmable metasurfaces are two-dimensional electromagnetic structures characterized by a low profile, conformability, and the ability to flexibly manipulate amplitude phase of waves. For high-quality beam scanning with metasurface, it is essential that metasurface possesses high-precision response quantization characteristics. This paper constructs reflection-type unit cell featuring four P-I-N diodes six operating states. To address cell’s complexity optimization challenges, we developed...

Satellite fog computing (SFC) achieves computation, caching, and other functionalities through collaboration among nodes. Satellites can provide real-time reliable satellite-to-ground fusion services by pre-caching content that users may request in advance. However, due to the high-speed mobility of satellites, complexity user-access conditions poses a new challenge selecting optimal caching locations improving efficiency. Motivated this, this paper, we propose scheme based on Double Deep...

With the rapid development of synthetic aperture radar (SAR), delivery platforms are gradually becoming diversified and miniaturized. The SAR flight process is susceptible to external influences, resulting in unsatisfactory imaging results, so it necessary optimize processing combination with quality assessment (IQA) index. Based on principle imaging, this paper analyzes impact defocusing results caused by mismatched filters draws algorithm motion blur, proposing a IQA index based average...

In this article, an all-metal structure antenna array is proposed. The novel hollow-out structures are designed to achieve low profile and lightweight. top of the element also tightly coupled, once again lowering profile. overall size 1354.0 × mm2, spacing between elements 323.0 mm. optimized array-structure only 0.12 λ0 (λ0 corresponds wavelength 0.4 GHz). addition, excellent dual-line polarization radiation achieved by using a cross-staggered arrangement. Both polarizations have...

A novel single-fed high-gain and phase-adjustable cavity slot antenna element is presented in this paper. The consists of a slotted cover, driven dipole polarization twist reflector. And 2×4 slots array etched on the top surface cover. To excite with uniform amplitude phase, reflector used here. Thus, can achieve property. In addition, by rotating dipole, provide continuous linear phase far-field region. With property, be regarded as an integration shifter, which favorable feature for phased...

Based on the AMC (Artificial Magnetic Conductor) reflector, a low-profile and wideband crossed dipole antenna for circularly polarized (CP) applications is presented in this paper. The consists of double-sided printed radiator, four parasitic loops an reflector. crossed-dipole radiator fed by pair vacant-quarter rings, generating radiation. By using loops, additional CP mode produced, which combines with original resonance to provide operation. Also, reflector used here obtain unidirectional...

A pattern reconfigurable antenna array with two elements is designed in this paper. The element made up of a printed Yagi and feed structure variable phase. By changing the states diodes these elements, far-field radiation phase both can be changed. That is, function realized. In way, impedance bandwidth 75.9% (2.7~6.0 GHz), which peak gain direction switched between -θ, 0 +θ (θ = 10°~16° at different frequencies). With simple structure, adjusted according to demands. It applied broadband...

A new reconfigurable center-feeding microstrip antenna is presented. By controlling the different states of PIN diodes, can operate in either normal patch or monopolar mode for number grounded shorted probes frequency bands. That to say, with eight connected ground, a right-hand circular polarization (RHCP) broadside radiation pattern excited at 2.5GHz. Otherwise, linear (LP) conical achieved 3.5GHz by four probes. The gains two modes are 9.0 dBic and 5.0 dBi, respectively. Compared former...

A novel reconfigurable antenna array with frequency selectivity is presented. By switching the radiation structures between Whip-type and E-type structures, working bandwidth range adjustable from 3.7~4.0 GHz to 13.4~15.0 GHz, which translated a tuning ratio of 4:1. The spacing elements 11.0 mm for both bandwidths. To verify feasibility, prototype fabricated measured, reasonable agreement simulated measured results obtained. This can be used in systems wide ratios.