A compact bandpass filter exhibiting an ultra-wide out-of-band rejection is studied and developed. combination of electromagnetic bandgap (EBG)-loaded half-mode substrate integrated waveguide (HMSIW) composite right/left-handed (CRLH) HMSIW used in this development. The proposed operates below the characteristic cutoff frequency HMSIW. CRLH loaded with EBG structures investigated first. a miniaturized size then implemented two slots etched on to reduce coupling effects between interdigital...

With the aid of specific microstructures in a subwavelength array, time-reversed electromagnetic wave can display spatial super-resolution focusing far-field zone. A array planar monopoles is proposed this paper. Each element monopole, etched aperiodically with many microstructured complementary split rings. An important property antenna that if multiple such are placed face to face, perform time-reversal as small one twentieth wavelength. The validity characteristics verified by...

In this communication, a new approach for sub-wavelength array design based on time reversal technique is proposed. Three chirped delay line with different group slopes are embedded into as independent feeding lines. With the pre-distortions provided by line, when used, novel has far-field super-resolution focusing property. Different from evanescent-to-propagating spectrum conversion mechanism, can improve radiation efficiency of because no micro-scatterers in near field elements required.

Increasing the radiated microwave penetration depth is key to breaking limitations of action range in lossy human body for non-invasive technologies such as hyperthermia, imaging, and wireless charging implantable devices. This paper presents a method increase by matching complex impedance skin surface using two-layered medium. The proposed avoided mismatch caused real assumption when traditional method. Therefore, reflection loss on could be significantly reduced, thereby increasing...

The Data communication on pipe-like structures presents a unique opportunity for gas pipeline industry or oil drilling and exploration to meet the need information transfer data telemetry over long distance. Typically, operating environment under which is required not suitable traditional modalities such as wireless radio communication, optical cable acoustic sound communication. Elastic waves are that can propagate distance solid medium metal pipes strings. We have demonstrated...

Rotman lens is a prospective device for real-time microwave/millimeter-wave imaging by virtue of its parallel multibeam functionality. For purposes, intrinsically requires that the scattered waves arriving at array be plane waves. However, this requirement cannot met in near-field applications, as from targets near field defocus beam ports because nonplane wave scattering. As result, out-of-focus blurs appear images, thus leading to degradation picture quality. To address problem, we propose...

Piezoelectric sensors that are embedded in large structures and inter-connected as a sensor network can provide critical information regarding the integrity of being monitored. A viable data communication scheme for networks is needed to ensure effective transmission messages structural heath conditions from nodes central processing unit. In this paper we develop time reversal based data communication scheme utilizes guided elastic waves health monitoring applications....

A novel optically controlled microwave switch has been designed for applications in reconfigurable antenna systems. This new configuration consists of a microstrip transmission line with gap etched the metal strip and two identical square open-loop resonators. piece silicon photoconductive dice is placed on gap. With no optical illumination exhibits well-defined stopband. The isolation about 53 dB at resonant frequency 11.65 GHz. When light focused onto dice, photoconductivity effect...

This paper investigates the coexistence issue between pulsed ultrawideband (UWB) radio devices and existing narrow band IEEE802.11a systems by using time-reversal method. In this study, time reversal is applied to UWB system. Based on statistical path loss model, we compared transmission scheme with traditional scheme. The comparing results show that a potential candidate for radios coexist more at reduced separation distance while without causing dangerous interference.

An optically controlled microwave switch (OCMS) with improved performance is demonstrated by introducing a complementary split-ring resonator (CSRR). The CSRR etched in the metal ground and placed just below microstrip gap that bridged piece of high-resistivity silicon dice. Thanks to deep transmission zero offered CSRR, high isolation off state can be achieved controlling position CSRR. Meanwhile, allowed designed smaller size for reducing insertion loss OCMS its on state. Measurements are...

Time reversal orthogonal frequency division multiplexing (TR-OFDM) has recently been received significant concerns in wireless sensor networks (WSNs) applications for its reliable, high-speed, and green communications multipath environments. However, most publically reported studies were typically performed strongly channels. In more general non-rich environments, the TR-OFDM performance not fully exploited. this paper, we make a comparative analysis of different We find that exhibit...

Compressed sensing theory supposes that a sparse signal can be sampled at rate much lower than the Nyquist–Shannon and reconstructed with high probability. Such sampling commonly requires finding set of optimal basis functions to sparsely represent first. This paper provides simple effective working process select for family pulsed radar echoes. The selection is performed in two steps. First,the waveform matching based on known array excitation carried out mother function from wavelet...

With the emergence of Internet Things (IoT), demand on wireless power supply to consumer electronics simultaneously requires much more location freedom, ease use, and performance with communications. In this paper, an unenclosed quasi-static cavity resonator (QSCR) constructed metallic strips design method are proposed theoretically analyzed. This QSCR has a simple structure, which benefits charging for portable/wearable smart appliances in office home environment. Meanwhile, it can achieve...

In this invited talk, we briefly summarize our research in the field of shaping microwave fields by time reversal focusing technique that were conducted at UESTC recent five years. The studies include shaped different desired patterns for wireless power transfer and heating, focused moving focus electromagnetic cutting, large gradient trapping multi-point spatially coded foci capacity communication applications.

On the basis of technique time reversal (TR), a new method for low dielectric contrast target detection in clutter by adding dispersive delay lines (DDLs) to each element TR mirror (TRM) is proposed. When compared with conventional system, proposed improves refocusing reducing impact other scatterers environment. The makes it unnecessary estimate position and removes need subsequent subtraction as traditionally required. Theoretical numerical simulated results demonstrate method.

Time reversal (TR) is a useful method that can focus electromagnetic waves precisely at the desired point in both time and space. In this paper, we find properly designed distributed micro-scatterers near-field zone of antenna array contribute to overcoming diffraction limit. By directly integrating micro-structured fractal slots (FS) split ring resonators (SRR) into each element, novel linear CPW-fed UWB antennas proposed TR with spatial super-resolution, which spacing between adjacent...

Elastic wave data communication on pipe-like structures presents a unique opportunity for structural health monitoring, gas and oil drilling exploration industry to meet the needs telemetry over long distance. Typically, operating environment under which is required these applications not suitable traditional modalities such as wireless radio communication, optical cable or acoustic sound communication. an unconventional modality in that it utilizes elastic medium channel waves information...

Abstract The spatial power combination based on the time reversal (TR) technique is severely affected by time‐varying characteristics of channels. In this paper, a mathematical model TR in slowly atmospheric channel and concept factor are proposed to study feasibility for incompletely reciprocal Combining theoretical analysis Monte Carlo simulations, we analyze relationship between efficiency permittivity channel, which follows normal distribution. results indicate that will be lower than...

The precise, uniform and constant wireless transmission of electromagnetic power to multiple targets in a local finite space is scientific problem be solved urgently. Aiming at this problem, paper we propose an automatic zone selection channel matching method based on time reversal technique which has the spatiotemporal focusing characteristics. proposed can not only adaptively compensate for differences different contribution rate multipath signals, but also dynamically divide working range...

A method to produce the complex time-varying electromagnetic fields of desired intensity distribution at specific time instant is proposed. First, this utilizes reversal mirror (TRM) generate a number TR focusing with their focus spots spatially spaced certain interval. After that are composed them based on linear superposition principle fields. This very similar use discrete Sinc pulses achieve arbitrary temporal waveforms. Two heart and pentagram shapes successfully illustrated validate...