The upper mid-band – approximately from 7 to 24 GHz — has recently attracted considerable interest for new cellular services. This frequency range vastly more spectrum than the highly congested bands below while offering favorable propagation and coverage millimeter wave (mmWave) frequencies. In this regard, potential provide a powerful complementary that balances capacity. Realizing networks exploit full of these bands, however, presents significant technical challenges. Most importantly,...

With the growing demand for spectrum utilization, concept of full duplex transceivers has become attractive. These simultaneous transmit and receive systems (STAR) are attractive as they double bandwidth utilization. To realize STAR, we must suppress self-interference (SI) between antennas. Doing this across a wide presents an even greater challenge. Further, antenna arrays, SI can be higher due to mutual coupling among neighboring elements. In paper, achieve 100 dB isolation practical large...

An extremely wideband (EWB) antenna array is presented that covers the UHF to C-bands (0.13-6 GHz). The has dual-linear polarization and capable of wide-angle scanning. Notably, this achieves a 46:1 contiguous impedance bandwidth at broadside with VSWR <; 3.1 across most band 4 when scanning down 60° in E-plane band. In H-plane, worsens 60°. addition building on tightly coupled dipole concept, enabling novelty EWB use frequency-selective surface (FSS) resistive card (R-card) within substrate...

People's health is adversely affected by environmental changes and poor nutritional habits, emphasizing the importance of awareness. The healthcare system encounters significant challenges, including data insufficiency, threats, errors, delays. To address these issues advance medical care, we propose a secure prediction method, prioritizing patient privacy transmission efficiency. Quantum-inspired heuristic algorithm combined with Kril Herd Optimization (QKHO) introduced for prediction,...

As we are witnessing the surge of ongoing wireless communication systems, simultaneous transmit and receive (STAR) schemes proving to be advantageous due doubling spectral efficiency. However, for successful realization STAR, need overcome a major bottleneck in suppressing self-interference from transmitter onto colocated receiver. Currently, mitigating this interference requires complex hardware advanced algorithms when employing an array applications such as multiple input, output (MIMO),...

Digital beamformers combined with ultrawideband (UWB) antennas are essential for realizing cognitive and software defined radios. Concurrently, advances in digital technology signal processing have drastically reduced beamforming complexity. Recently, a novel on-site coding receiver (OSCR) architecture was proposed to significantly reduce hardware requirement beamforming. Using OSCR, the from each antenna element is encoded, then several of these signals grouped digitized using single...

Recently, a novel class of on-site coding receivers was proposed. The architecture is suitable for digital beamforming in addition to offering multiple-input multiple-output capabilities. Essential its realization code division multiplexing technique aggregating multiple signal paths at the analog front end into single analog-to-digital converter. As result, significant hardware reduction and higher power efficiency are achieved when compared with conventional techniques. In this paper, we...

The development of reconfigurable antennas compatible with a CubeSat form factor can aid several space missions. Often, satellite missions require multiple wireless links the same radio, but design such is challenging due to mechanical constraints and limited power aboard CubeSat. In this article, we present unique antenna concept enabled by adhesive polyimide tapes. presented switch from conventional patch monopole-like minimal actuation complexity. This reconfiguration provides choices for...

Full-duplex (FD) antenna arrays are desirable for expanding the channel capacity of wireless systems up to 2, which is particularly important in crowded sub-6-GHz spectral bands. Conventional FD solutions based on circulators do not scale due presence significant mutual coupling between elements. This article describes a two-stage self-interference cancellation (SIC) method that suitable arrays. The first-stage SIC uses replica-antenna (RA)-based network passive and linear can thus be placed...

Implantable systems are often employed to perform continuous high-resolution recordings of neural activity. These frequently require invasive procedures when implanting and maintaining effective operation. This causes major interruptions daily life. Previous work demonstrated an in vitro minimum detectable signal 15 μV amplitude RF sensitivity down -135 dBm. suggests the possibility detecting diminutive biopotentials a wireless fully passive manner. Here, for first time, we validate...

A novel deployable inverted-hat monopole (IHM) antenna is presented for satellite applications. This frequency scalable was designed and verified in very high-frequency (VHF) band (40-160 MHz) 9U CubeSats ultrahigh-frequency (UHF) (200-600 1U CubeSats. The VHF ultrawideband (UWB) operates from 40 to 160 MHz on an infinite ground plane, with emphasis constant 5 dBi gain a deployed volume of 60 × 100 cm. On finite the achieves 3.2:1 bandwidth VSWR <; 3 average 0.5 dBi. capacitive top hat...

To overcome the limited payload dedicated to onboard antennas for CubeSat/SmallSat applications, this paper presents a novel, foldable, dual-polarized Tightly Coupled Dipole Array (TCDA). In comparison previous vertical feeds used TCDAs, array integrates planar microstrip balun feed enable foldability. The proposed attains 5.4:1 (0.6-3.20 GHz) impedance bandwidth with VSWR < 3 at broadside and scans down 45∘ all azimuth planes. Notably, substrate-integrated in-plane folding mechanism based...

The paper presents a first-of-its-kind digital beam-former using single-ADC for multiple-input-multiple-output (MIMO) applications. efficacy of this low power ultrawideband (UWB) beamformer is demonstrated by evaluating inter-channel interference (ICI), major challenge in MIMO. Central to the approach code multiplexing method orthogonal Walsh-Hadamard (WH) codes generated via radiofrequency system-on-chip (RFSoC) field programmable gate array (FPGA). This done at maximum 400 MHz clock...

Recently, we proposed a code-modulated multipath receiver front-end to reduce the number of analog-to-digital converters (ADCs) behind antenna elements and realize significant area, cost, power reduction. More specifically, code division multiplexing was implemented at analog for path combining into single ADC. At digital baseband, reverse process applied recover signals pertaining each path. Such front-ends are suitable spatial diversity beamforming. For latter, it is important accurately...

With the growth of wireless data traffic, additional spectrum is required to meet consumer demands. Consequently, innovative approaches are needed for efficient management available limited spectrum. To double achievable spectral efficiency, a transceiver can be designed receive and transmit signals simultaneously (STAR) across same frequency band. However, due coupling high power transmitted signal into collocated receiver, receiver's performance degraded. For successful STAR realization,...

To date, CubeSat radars and imagers have been limited to operations beyond S-band due the challenges associated with design of wideband, compact, low-frequency antennas. Concurrently, frequencies at VHF/UHF bands can image through clouds foliage, are very attractive for ice, water biomass sensing. There is thus a need develop wideband antennas that operate which low cost, light-weight, packable. In this paper, we present deployable Tightly Coupled Dipole Array (TCDA) achieves VSWR<; 3 from...

Ultrawideband system with digital beamforming allows for spatial filtering and multiuser detection without degradation of the signal-to-noise ratio (SNR). Along these lines, we propose a novel on-site coding receiver (OSCR) architecture that has already been verified to significantly reduce hardware requirement at analog back end. Using OSCR, signal from each antenna element is encoded, then several signals are grouped digitized using single analog-todigital converter (ADC). At end, field...