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This paper describes a waveform generator for 77 GHz automotive radar systems based on a fractional N-Phase Locked Loop (N-PLL) with a third-order delta-sigma (ΔΣ). A control unit is used to control the ΔΣ modulator to vary the output frequency. The behaviour of the generation is simulated in Simulink and ten output frequencies with a slight difference are generated. The proposed generator has the...
In this paper, we proposed a compact circularly polarized (CP) antenna with broadside and conical radiation patterns for pattern diversity. The broadside CP pattern is generated by a corner-truncated patch antenna. The conical CP pattern is generated by a rotationally symmetric folded metallic strip, which is fed at centre. A prototype of the diversity antenna operated at 2.4 GHz has been built. Simulations...
The vehicle radars should be able to detect all stationary or moving objects inside the observation area with short measurement time, high range and velocity resolution, and cost efficiency. To achieve this, an improved model called Double-SFPW based on SFPW is described, it transmits two stepped frequency pulses with a frequency shift and a time difference, its performance is better than conventional...
This paper presents an ultra-wideband and ultra-low-voltage compact power detector IC for microwave and millimeter-wave applications. The power detector circuit includes an nMOSFET differential pair with resistive feedback and a pMOSFET buffer. The power detector IC was designed, fabricated and fully evaluated using Fujitsu 65-nm CMOS technology. The detector IC exhibits an operation frequency from...
This paper presents a unified coupling-matrix synthesis method for microstrip quadruplet bandpass filter on λ/4 resonators. The mainline is implemented with cascading four λ/4 resonators via alternative J and K inverters, while the weak cross coupling path is created with a J inverter between the 1st and 4th λ/4 resonators. The resultant bandpass filter features a generalized Chebyshev in-band frequency...
A compact ultra-wideband (UWB) bandpass filter with an inherent notched band and steep slopes has been presented and implemented with the low temperature cofired ceramic technology. The filter is realized by a stepped-impedance T-shaped resonator (SITR) coupled to a pair of quarter-wavelength input/output feed-lines. The proposed SITR can facilitate not only a notched band, but also sharp roll-off...
In this paper, we present an optimized RF LDMOS transistor structure based on modified CMOS technology. The drift region is improved to reduce the change rate of the output capacitor of the transistor and ameliorate the linearity of power amplifier. Hot Carrier Injection (HCI) is alleviated by reducing the electric field at the gate edge near the drain by optimizing the field plate and the doping...
A 0.18-μm SiGe BiCMOS concurrent dual-band power amplifier (PA) was developed. The PA can work in concurrent dual-band mode at 25.5 and 37 GHz as well as single-band mode at 25.5 or 37 GHz. The measured results show that, in the single-band mode, the dual-band PA exhibits gain of 21.4 and 17 dB, maximum output power of 16 and 13 dBm, and maximum power added efficiency (PAE) of 10.6 % and 4.9 % at...
An ultra-low-leakage RF pulse generator capable of producing very narrow RF pulses with small rising and falling time for short-range high-resolution radar and high-data-rate communication systems is developed using 0.18-μm BiCMOS technology. The RF pulse generator exhibits an extremely-low RF leakage implementing the RF leaking suppression technique, in which the RF leaking signal is cancelled by...
A circular polarized Fabry-Perot resonator antenna for dedicated short range communication(DSRC) is presented in this paper, the superstrate of which has the FSS structure with square elements. The antenna is designed to meet the physical layer protocol of Chinese National standard GB/T 20851-2007. The full-wave simulation results obtained by Ansys HFSS show that the proposed Fabry-Perot antenna has...
Dual-mode ring resonator filter is designed to have a relatively wide passband with a miniaturized circuit area. The miniaturization is achieved by folding the ring trace to a spiral configuration. The two degenerate modes are split up by an asymmetric inductive perturbation. As a result, the circuit area is only 29% of that of a conventional ring. The strong I/O coupling required by the wide passband...
This paper presents design and linearization of an inverse class-F RF power amplifier using a GaN HEMT transistor, which is operated at the band of 910MHz-950MHz. A harmonic control network is utilized to compensate the parasitic effect brought from the parasitic parameters network. The measured results with a 930-MHz continuous-wave (CW) signal illustrated that highly efficient operation is achieved...
This paper presents some recent advances in the electromagnetic modeling and design of substrate integrated waveguide (SIW) components. The modeling of losses in SIW structures is discussed in details, and a new formula for the calculation of the attenuation constant due to radiation loss is introduced. In addition, an efficient technique for the modeling of arbitrarily shaped SIW components is discussed:...
In this paper, the development of a Q-band doubly balanced mixer in 0.15um GaAs pHEMT process is presented. Five-conductor coupled line Marchand balun is designed and utilized for the LO and RF signal input. Instead of using conventional input port matching method, the complex impedance of the diode ring is directly matched with differential single-stub networks between the balun and diode ring, which...
Sparse excitation source reconstruction is a recently developed method for array failure diagnosis. The method reconstructs the excitation source of all elements utilizing the sparsity of the excitation vector, which improves the accuracy of the source reconstruction. Meanwhile, the sparse excitation source reconstruction provides straightforward information on the failing elements. However, same...
This paper presents a quasi yagi microstrip antenna which is backed by meander line bridge Frequency selective surface (MBFSS) for a handheld UHF RFID reader. Long read range handheld reader antennas have been usually packaged outside of the reader units in most cases due to the mutual coupling and environment effect. In the proposed antenna, we reduce such effects by placing MBFSS under the quasi...
An ultra-wideband (UWB) rectangular dielectric resonator antenna (DRA) integrated with a narrow-band (NB) DRA is presented. The proposed antenna consists of a UWB rectangular DRA excited by a bevel-shaped patch and a NB DRA excited by a strip. The simulated results demonstrate that the UWB antenna provides a 2:1 voltage standing wave ratio (VSWR) bandwidth for 2.5–12 GHz, integrated with a NB antenna...
This paper presents a novel procedure to the design of independent tunable dual-band bandpass filters with constant absolute 3-dB bandwidths. Only two bias voltages are required to control the locations of the passbands, respectively. Two kinds of dual-mode resonators are proposed to be selected while designing the passbands. Based on different parameters of even- and odd-modes, there are four types...
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