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This work reveals the design for broadband GaAs Class-F power amplifier employed in terminal applications. The approximated continuous Class-F mode was analyzed and applied to GaAs device. A harmonic matching network was used to realize a broadband fundamental load impedance match while the second and third harmonic impedance are kept inside the high-efficiency region on the edge of the Smith chart...
A adaptive array antenna system consisting of antenna array and adaptive processor can easily control directivity patterns, by enhance the desired signal and suppress interference signal. The classical LMS has a contradiction that fast convergence rate and low steady state error. In order to overcome this contradiction, this paper presents a new algorithm which uses gradient vector features to achieve...
A novel differential-fed magneto-electric dipole antenna with unidirectional radiation pattern is proposed. Based on the differential feed scheme presented in [1], a new pair of differential feeds is developed to provide an ultra-wideband impedance matching. Instead of a planar reflector, a rectangular box-shaped reflector is utilized to reduce the fluctuation of the antenna gain. The proposed antenna...
In this paper,a broadband stacked patch antenna fed by F-probes and its array are proposed. The antenna element is composed of two stacked radiating patches, a grounded reflector and two orthogonally-placed pairs of F-probes which are connected to the 180 phase difference feeding network. Then a 4×1 array is designed and simulated. Both the antenna element and its array can achieve the slant ±45°...
In this paper, a convenient and effective method is proposed to synthesize an line array radiation pattern in arbitrary array topology. This method is modified from the conventional Fourier transforms relations and able to synthesize a non-uniform array. A new function is utilized to form a modified Fourier transform pair. The function includes two variables, i.e. the array geometry coordinate and...
This paper presents a V-band power amplifier in a bulk 65 nm CMOS technology with the peak gain 14.5 dB and 3-dB bandwidth of 28.8 GHz (50.8 GHz to 79.6 GHz). The PA has demonstrated 15.1 dBm Psat and 18.9 % peak PAE. The PA features three stage transformer coupled differential architecture with integrated input and output baluns. The entire PA core occupies 0.31 mm2 chip area and dissipates about...
This paper presents a sub-harmonic mixer IC design for W-band automotive radar applications in 130-nm SiGe BiCMOS technology. The mixer makes use of a Common Emitter Common Collector Transistor Pair (CECCTP) structure mixer core with a Marchand balun for the W-band on-wafer measurement. The balun achieves a measured amplitude imbalanced of less than 0.9 dB and a phase imbalance of less than 2.5 degrees...
A quadruple-mode resonator based on stub-loaded was proposed. The resonator possesses four resonances over the wide frequency band from 3.1–10.6 GHz, which can be employed to implement an ultra-wideband bandpass filter(BPF) to achieve flat response. The quadruple-mode resonator is investigated by using odd-even mode analysis and weak coupling method. Two transmission zeroes are located at the upper...
Conceptual design of a novel multi-resonated complementary antenna is proposed. By perpendicularly incorporating an offset microstrip-fed slot radiator and a symmetrical aperture-dipole element, the dominant one half-wavelength mode and two fractional-order dipole modes, i.e., the three quarters-wavelength mode and seven quarters-wavelength mode can be excited and triple-band operation can be obtained...
This paper presents an chip-to-waveguide-horn (CWH) antenna structure to improve silicon-based on-chip antenna gain at D-band. In the proposed CWH antenna structure, a transition from chip to rectangular waveguide is adopted and is followed by a horn for power radiation. For the chip-to-waveguide transition, a high efficiency dielectric resonator antenna (DRA), which is excited by a substrate integrated...
A new direct parameter extraction method of small-signal equivalent circuit for radio frequency laterally-diffused Metal Oxide Semiconductor Field Effect Transistor (RF LDMOSFET) with Faraday shield biased in cut-off operation is presented in this paper. A series of analytical equations are derived for non-linear rational function fitting as well as linear regression to measured device frequency response...
The terahertz 4 × sub-harmonic down-mixer fabricated in standard 0.13µm SiGe BiCMOS Schottky barrier diodes is demonstrated. The 340 GHz sub-harmonic mixer (SHM) is designed based on anti-parallel-diode-pair (APDP). With the 4th harmonic, LO frequency of 85 GHz is used to pump the 340GHz SHM. With LO power of 9dBm, the mixer exhibits measured conversion loss of 39–43dB in the lower band (320–340 GHz)...
A vector modulatorat Ka band consisting of two balanced I/Q bi-phase attenuatorsis presented in this paper. The bi-phase attenuators are of reflection type, in which cold state pHEMTs are employed as tunable impedance loads. Due to the balanced structure, parasitic effects of the pHEMTs are effectively cancelled. A prototype of the vector modulator is fabricated by HMIC technique. The measured dynamic...
With the rapid development of embedded and wireless technology, the combination of embedded system with wireless technology has gradually become a research hotspot. This paper proposes a data acquiring embedded system based on AD9361 (high speed ADC) and ZC706 (high performance FPGA embedded platform).The purpose of the proposed system in this paper is to capture wireless signal from bandwidth varies...
Dynamic spectrum management (DSM) of cognitive radio networks (CRNs) has been a hotspot for spectrum management departments as well as research community to alleviate spectrum scarcity problem. With the motive of facilitating CRNs with spectrum-related information with low cost in different scenarios including infrastructure less environment, this paper proposes a spectrum map based DSM (SMDSM) framework...
A transmission-line bandpass filter based on bandstop filter is proposed in this paper. A key merit of the filter configuration is that the position of the transmission zeros can be conveniently controlled whereas the bandwidth is fixed. The bandpass filter consists of two half-wavelength resonators, two open circuited uniform impedance resonators and one stepped impedance resonator. With five reflection...
Due to the increasing of natural disasters, a novel localization system for search and rescue would be developed. Considering the popularity of mobile phones, the radio signal generated by the mobile devices can be utilized for rescue and localization. This paper presents a phone-based localization system for search and rescue purpose and the studies of radio channel characteristics through both theoretical...
A portable, real-time, wireless indoor air monitoring system is designed using the Arduino Yun platform. Because of the importance of a clean indoor environment on human health, the proposed prototype is designed to monitor the temperature, humidity, volatile organic compounds (VOCs) and miniature dust particles. The Arduino Yun platform incorporates an MCU that acquires and sends the data to a Wi-Fi...
In this paper, a high performance sub-harmonic mixer for W-band application using a low cost approach is developed. By flip-chip bonding a high performance schottky diode onto a separately fabricated passive circuit having a quartz substrate, a quasi-monolithic millimeter-wave integrated circuit (Q-MMIC) mixer is achieved. Compare to MMIC, the discrete device and passive circuitry of the Q-MMIC are...
This paper presents a high resolution tuning scheme for the LC digitally-controlled-oscillator (DCO) based on desensitized tail capacitance tuning. The sensitivity of the oscillation frequency to the tail capacitance is quantitatively analyzed. The impact of the tail capacitance on the phase noise is qualitatively discussed. Our analysis and simulation results show that both the phase noise and the...
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