A novel theory is proposed in this article to design a bandpass frequency-selective surface (FSS) with stable angular response. Based on theory, the performance of structure closely related its tangential and normal components permittivity permeability. Theoretical formulas are derived realize high-efficiency transmission response independence. To validate our concept, an ultrawide-angle FSS metallic strips square patch printed dielectric substrate designed, it exhibits characteristic...

This article presents a packaging technique for monolithic microwave integrated circuits (MMIC) demonstrated in fully receiver (Rx) module at the D-band (110-170 GHz). The solution consists of an MMIC-to-waveguide transition realized using on-chip probe mounted E-plane split-block waveguide module. An artificial magnetic conductor structure is implemented to suppress cavity modes and achieve better coupling from probe. transition's performance experimentally verified back-to-back test chip,...

This paper proposes a new concept of designing compact high precision millimeter-wave wideband variable phase shifters. The shifter is implemented with stacked shim extremely short length 0.9 mm and two waveguide flange adaptors 0.5 mm. High shifting achieved over entire D-band (110-170 GHz) by rotating the 90 degrees from aligned to perpendicular consistent impedance matching performance. In addition, glide-symmetric holey electromagnetic bandgap (EBG) structure adopted avoid wave leakage...

A novel synchronous baseband receiver is presented in this letter. With a pilot tone insertion at the transmitter, proposed can perform carrier recovery (CR) regardless of modulation scheme and/or baud rate. The has an analog-digital hybrid structure, where low-cost digital signal processor controls analog local oscillator (LO) frequency and phase to achieve CR. This structure requires only one analog-to-digital converter (ADC) with sampling rate 100 MS/s. proof-of-concept demonstration...

An enhanced accuracy random binary phase modulated radar is proposed.It can be used in high monitoring manufacturing.Compared with the traditional using frequency continuous wave (FMCW), proposed system a multi-user scenario without occupying more bandwidth.A two-step distance estimation method introduced to estimate distance.First, narrowed down half carrier wavelength by analyzing envelope of signal.Then information increases several micrometers.An equalization solve I/Q imbalance...

Due to government and other agency regulations, microwave bands, which range in frequency from 6 42 GHz, often have a small bandwidth of few hundred megahertz, lowers the data rate for communications. On hand, high communications can be realized millimeter-wave (mm-Wave) frequencies (30–300 GHz). Tens gigabits per second are available mm-Wave such as D-band, 110 170 H-band, 260 GHz <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Compressed sensing assisted Joint Channel Estimation and Detection (JCED) for asynchronous Direct-Sequence Code Division Multiple Access (DS-CDMA) system is considered. We present a new dictionary matrix to characterize the sparsity of multiuser signals transmitted over dispersive channels. Using dictionary, amount non-zero entries in sparse representation reduced 1/Q that literature, where Q number symbols observation window. The JCED algorithm relying on at least 1/2 min{Q, L} times...

Orthogonal Frequency Division Multiplexing (OFDM) technique is obtained significant attention in radar applications for its interference resilience property. In this paper, Fractional Fourier Transformation (FRFT) and phase analysis techniques are proposed to enhance ranging accuracy of an OFDM Radar. A proof-of-concept built tested at 79 GHz a range 20 μm 5 MHz measurement rate was measured. The 500 times higher than using fast transformation (FFT) method.

A coded pilot assisted high data rate millimeter-wave receiver topology is presented in this article. low and power pseudorandom noise (pn) signal superimposed at the transmitter, can use such for carrier recovery (CR) and/or channel estimation regardless of modulation scheme or communication rate. The proposed baseband has an analog-digital hybrid structure where a low-cost digital processor used. This requires only analog-to-digital converter (ADC) with sampling 40 MSPS. proof-of-concept...

A methodology of designing an E-band waveguide 32 × slot array antenna with high-efficiency and low-cost manufacturing characteristics is proposed in this article, which based on integrated electronic bandgap (EBG) ridge designed by integrating a cross rectanglehollow EBG structures the conventional waveguide. The structure intercepts leakage from unconnected gap between two metallic plates waveguide, then it decreases cost without using diffusion bonding technology multi-layer welding...

A novel methodology to create metallic waveguides with multilayer integrated vertical-electromagnetic bandgap (EBG) structure is proposed in this article, and the realizes low-cost millimeter-wave (mmWave) slot array antennas. stack of easy-to-process thin etching plates introduced design mmWave waveguide using compression fit instead diffusion bonding welding assembly process. The electromagnetic (EM) wave leakage from gaps between suppressed vertical-EBG antiphasing feeding. dispersion...

A high speed differential quadrature phase shift keying (DQPSK) modulator and demodulator (modem) is presented for data rates up to 40 Gbps, in which the based on an FPGA analog components. The modem performance has been verified a lab environment. targeted application wireless communications using millimeter-wave bands as flexible alternative optical fiber links next generation mobile networks.

Aiming at the problem that main frequency of seismic data is low, and it difficult to predict thin sand bodies, pseudo-acoustic impedance inversion carried out, technical idea method are formed, which has good effect in practice provides reference for similar interpretation.

This paper reveals a millimeter-wave point-to-point radio link of MPSK (QPSK, 8-PSK, and 16-PSK) modulation without the need an analog to digital converter (ADC). The proposed uses clock data recovery (CDR) applied in optical-electrical (OEC) recover intermediate frequency (IF) signals offset as well over fiber (RoF) concept extend transmit distance central unit remote unit. synchronous removes high-speed ADC requirement for digital-intermediate-frequency-over-fiber (DIFoF) link, which can...

A multi-channel backscatter communication and radar sensing system is proposed demonstrated in this paper. Frequency modulated continuous wave (FMCW) ranging integrated with simultaneous uplink data transmission from a self-packaged active radio frequency (RF) tag. novel package solution for the RF With package, tag can transmit 32-QAM signal up to 2.5 Gbps QPSK 8 Gbps. For multi-tag scenario, we using spread spectrum code separate each In case, tags be placed at arbitrary locations without...

Radar sensors at sub-THz frequencies (100 - 330 GHz) can potentially be used in car in-cabin monitoring systems. In designing such sensors, knowledge of the propagation conditions bands is useful. Considering rather novel use-case, data not readily available and must gathered through measurements. This paper presents a Cross-Section (RCS) imaging system, which has been developed order to characterize reflective properties common objects 243 GHz. The system produces two types data, RCS...

In millimeter-wave communication systems, generating high output power with efficiency on the transmitter side is one major challenge. this paper, a symbol-based outphasing combining solution has been demonstrated data rate up to 8 Gbps at an RF frequency of 83.5 GHz. This provides 2 dB higher compared two QAM signals 12% EVM.

This study analyzes the mechanism behind signal demodulation in GaN high-electron-mobility transistors, finding relationship between gate bias voltage and relative amplitude of output voltage. The optimal for maximum responsivity has been analytically found. demodulator at different biases characterized using an on–off keying with a 90 GHz carrier. Furthermore, from measured eye diagram it is observed that can demodulate data rate up to 1.28 gigabits per second. presents promising method...

In this work, a dual-mode (divide-by-2 and divideby-3) dynamic frequency divider is presented. A tunable delay gated ring oscillator (TDGRO) topology proposed for dualmode operation bandwidth extension. It uses 130-nm gate length SiGe BiCMOS technology with the f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</sub> xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> of 250 370 GHz, respectively. Verification shows that it works at W-band...