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The joint operation of radar sensing and wireless communication, namely RadCom system, yields a unique platform to meet the requirements of future intelligent transportation networks. Taking advantages of OFDM waveform, the range-Doppler coupling issues can be overcome for radar applications and complex equalization filter is no longer necessarily used to cope with frequency-selective fading channel...
In this paper, an ultra-low phase-noise VCO operating from 2.619 to 2.996 GHz, destined for P2P backhaul communications, is proposed and realized in IBM 0.13-um SiGe process. The VCO uses a differential Colpitts topology with thick-oxide PMOS transistors. 5-bit digitally controlled capacitor array and hyper-abrupt varactors with MIM capacitors are employed for coarse and fine tuning, respectively,...
In this paper, a wideband planar dual-polarized dipole with two pairs of T-shape loadings is designed for the base-station antennas. The proposed planar dipole has a vertically printed feeding balun, easy to be fabricated and mounted. The bandwidth of traditional printed dipole can be enhanced and the profile can be reduced. Two such dipoles are cross arranged to realize a dual-polarized antenna....
Compact quad-channel diplexer (2.5/3.5GHz and 3/4GHz) using meandering short stub loaded resonators is proposed. The quad-channel diplexer is composed of two pairs of coupled short stub loaded resonators to obtain independently controlled bandwidth at each passband and to reduce the circuit size. In addition, the mixed electric and magnetic coupling is employed to create a desired transmission zero...
A compact wideband fractal loop-dipole composite antenna is presented. By introducing a Koch fractal structure, the antenna's size can be reduced while maintaining good pulse fidelity. It is demonstrated that an impedance bandwidth from 2.86 to 11.23GHz for |S11| lower than −10dB could be obtained. Furthermore, stable radiation pattern and pulse fidelity of 0.75 could be achieved in the same bandwidth.
The in-phase and quadrature (I/Q) calibration has been typically implemented in DSP/MCU to reject image in receive chain. In this work, a compact, fully-integrated calibration technique is proposed without the need of baseband processors, which is very suitable for low-power low-cost wireless applications. By making use of the transmitter (TX) phase loop lock (PLL) in frequency duplex division (FDD)...
This paper presents a novel Doherty transmitter architecture with antenna active load modulation (AALM) to improve the efficiency of array transmitters. In this paper, the conventional power combiner which limits the performance of Doherty power amplifier is removed, and two power amplifiers (PAs) are directly connected to antenna array. Unlike conventional Doherty architecture, the proposed Doherty...
A wideband bandpass filter under multiple resonances of stepped impedance ring resonator is proposed in this letter. The classical even- and odd-mode method is used to analyze the characteristics of the proposed resonator. It is observed that the proposed filter can operate at a wideband. For demonstration, a filter with central frequency at 2 GHz and 3-dB fractional bandwidth (FBW) of 96.7% is designed...
A 14.4-GS/s 5-b ADC is designed in 40nm CMOS with eight time-interleaved channels of Flash/Successive-Approximation hybrid sub-ADCs each running at 1.6GS/s. A modified bootstrapped track-and-hold switch incorporates a global clock to synchronize the sampling instant of each individual sub-channel, therefore improving multi-phase alignment. Measurement results show that the ADC can achieve a peak SNDR...
This article presents the fabrication and experimental validation results of compact size high gain conical horn lens antenna for E-band (71–86GHz) applications. Very promising measured results are obtained in terms of return loss |S11|, gain, aperture efficiency, bandwidth and SLL as will be shown in this article. A peak measured gain of 25.8dB, gain improvement 6.5∼8.8dB over the gain of the horn...
This paper reports compact, wideband, low-dispersion, metamaterial-based phase shifters with lower loss, wider bandwidth, and fewer MEMS switches than previous designs. The present design is based on a novel 90° unit cell which uses two synchronized MEMS switches that are actuated and unactuated in unison for the through and delayed states, respectively. By combining three of these 90° unit cells...
Towards future large-volume data (such as UHD video) transferring between data storage and server, massive MIMO concept for sub-THz wireless communication by CMOS technology is explored in this paper. To compensate large path loss and attenuation, CMOS power efficient RF-front for massive MIMO is discussed by the use of metamaterial device for coherent sub-THz signal generation, propagation and detection.
Two-dimensional (2D) materials with innate thinness exhibit unique electronic properties different from their bulk form could open up new opportunities in a diverse electronics and photonics field. To integrate 2D layered materials for scalable manufacturing, large-area synthesis to produce high quality film with precise control of thickness and uniformity is necessary. This work reported the first...
This paper presents a novel wideband high gain rectenna (rectifying antenna) for RF energy harvesting. The proposed device consists of a double-sided antenna, a low-pass filter and a doubling rectifying circuit using Shottcky diodes as rectifying elements. It works over the frequency range from 1.9 to 3.2 GHz. The simulated results demonstrate that the maximum rectenna conversion efficiency is nearly...
A novel circuit structure for a tri-band Wilkinson power divider is proposed that can suppress the harmonic components, and provides the equal power division ratios. It consists of three-section transmission lines, two inductors, and two isolation resistors. Using rigorous even- and odd-mode analysis, the analytical design equations for this proposed power divider are obtained. In addition, a divider...
This paper proposes a nonlinear filter-based model with low complexity for concurrent dual-band digital predistortion. The model saves remarkable number of multiplication and needs low precision of calculation, and can be easily realized on hardware platforms. Moreover, this model achieves almost the same linearization performance as the 2D-DPD model. A broadband GaN HEMT power amplifier is used to...
A novel shorted CPW-fed slot antenna with wideband circular polarization characteristic is proposed in this letter. The proposed antenna consists of a bi-directional radiation slot antenna printed on a single substrate and a reflector for unidirectional radiation. A half circle slot and a slim slot are involved to optimize the axial ratio (AR) bandwidth and taper on the feeding line is utilised to...
A polarized modulation (PM) scheme is proposed for mobile satellite broadcasting (MSB) in this paper. PM employs polarization domain to represent information, which is different from the conventional dual polarization spatial multiplexing (SM) or space time block coding (STBC) schemes in MSB. At any transmission instant, only one polarized antenna is activated, which avoids cross polarization interference...
A low phase noise and wide tuning range voltage-controlled oscillator (VCO) operating at 10GHz and a mixed design of current mode logic (CML) divider is designed and fabricated in TSMC 0.13-um CMOS technology. The VCO achieves a wide tuning range of 27.5%(9.1 GHz to 11.9GHz), and provides an output power of −3dBm, while drawing 10mA from 1.3V power supply. The measured output phase noise is −116.4...
In this paper, a broadband up convert image-reject mixer integrated the quadrature signal generator is presented. The RC polyphase network (PPN) is used to convert the single-end LO input signal to differential and quadrature signals. A pair of inductors are added to the traditional PPN to enhance the image rejection ratio (IRR). A linearity enhanced tranconductance cell is applied to the quadrature...
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