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This paper presents a novel dual-band bandpass filter design based on hybrid structure of substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL), which is implemented by multi-layer printed circuit board process. The hybrid structure is realized by inserting the SICL resonator into the volume of the SIW cavity which enables the hybrid structure to support the co-transmission...
Two novel bandpass filters (BPFs) with the same structure but different bandwidth are presented in this paper, they are based on multilayered printed circuit boards. In this work, an H-shape coupling slot is used to realize hybrid coupling, two substrate integrated waveguide (SIW) cavities in different layers are used for resonators, and the coplanar waveguide (CPW) in input and output port is used...
In this paper, a compact bandpass filter using quarter-mode substrate integrated waveguide (QMSIW) cavities with mixed coupling is presented. The mixed coupling is realized by etching a coplanar waveguide(CPW) at the magnetic coupled neighborhood section of two cascaded QMSIW resonators, which introduces two transmission zeros at the lower and higher rejection band. The filter enjoys merits of good...
In this paper, the implementation of an X band Tx-to-Rx leakage cancellation network to achieve bandwidth improvement and high isolation performance is presented. The circuit architecture and leakage cancellation theory are described in detail. The operation principle of leakage cancellation network is based on phase cancellation technique. This architecture is made up of three two-section Wilkinson...
In this paper, a novel wideband bandpass filter is proposed using a stepped impedance stubs resonator and substrate integrated coaxial line (SICL) technology. The resonator produces three resonant frequencies and two attenuation poles near the edges of the passband, so a wide bandwidth and a sharp rejection can be obtained. A filter prototype with compact size is simulated and the results indicate...
In this paper, a novel tunable microwave bandpass filter (BPF) based on liquid crystal (LC) technology is presented. For ease of supplying ac voltages, the proposed filter is achieved by particular configuration schemes with low cost inverted-microstrip structure. Two open-circuited stubs are placed inside a meander loop resonator so as to form quarter wavelength resonators, which is good to keep...
In this paper, a novel tunable microwave bandstop filter (BSF) based on LC technology is proposed. A meander loop resonator with two open-circuited stubs located into the input and output ports are used in the design. Due to two additional open-circuited stubs, the proposed filter has better rejection in the stopband performance without increasing the circuit size. For ease of supplying ac voltages,...
Frequency modulation continuous wave (FMCW) radar has the merit of simple structure, small volume, high resolution in space and real-time character. So FMCW radar can detect and orientate the targets on the ground no mater how far they are. However, the measure precision is affected by the FFT method used in the FMCW radar system. In this paper, a new method for increasing the range and velocity measure...
In this paper, a narrowband bandpass filter with wide upper stopband and high selectivity at X-band is presented. The proposed filter consists of hybrid λ/2 and dual-mode resonators. Different from the conventional even-odd mode method, the proposed filter has a dual-mode resonator which can be equivalent to separate λ and λ/2 resonators. Three transmission zeros can be produced near the core passband...
In this paper, a substrate integrated waveguide (SIW)-to-defected ground structure (DGS) bandpass filter with moderate fractional bandwidth and improved stopband performance is proposed and demonstrated for X-band radar application. Design considerations including the design approach are addressed. A third-order filter with a passband of 8.8–10.1 GHz is fabricated on a single-layer Rogers RT/Duroid...
In this paper, a intelligent and fast two-dimensional constant false alarm rate (CFAR) processor to perform adaptive threshold target detection is presented. It employs a composite approach based on the well-known cell averaging CFAR (CA-CFAR) and ordered statistic CFAR (OS-CFAR) processors. In this case, any masking effects in multi-target situations can be avoided without increasing the computation...
In this paper, we study colocated multi-input multi-output (MIMO) radar in the context of sparse modeling for estimating the unkown target parameters (direction of arrival (DOA), amplitude). Inspired by the idea of restricted isometry property (RIP) and Gram matrix, a two stage method to adaptively design the weight matrix and the sensing matrix that can improve DOA estimation performance at the receiver...
In this paper, the signal model of ULA is presented, and then two kinds of Direction Of Arrival (DOA) algorithms, traditional MUSIC [1–2] and spatial smoothing MUSIC [3–5], are analyzed with comparison with DOA using co-prime arrays based on convex optimization [7]. Finally, spectra and RSME performances are compared. Traditional MUSIC algorithm requires received signals to be incoherent, while spatial...
In this paper, a millimeter wave vertical transition with ultra wideband filtering function is presented. Compared with the traditional vertical transition, it not only has the vertical transition function, but also has ultra wideband millimeter wave filtering function. The simulated result shows that the proposed vertical transition has a good performance. The insertion loss in the center frequency...
In this paper, a novel Ku-band bandpass filter using triple-mode resonator is presented. It has compact size and easy to be fabricated. The measured result shows that the proposed novel Ku-band bandpass filter using triple-mode resonator has a good performance. The insertion loss at the center frequency of 17.25GHz is 0.53dB and 3dB bandwidth is from 15.6GHz to 20.5GHz. Its bandwidth is about 4.9GHz...
In this paper, two bandpass power dividers (BPD), one using conventional quarter-mode substrate integrated waveguide (QMSIW) and the other using both QMSIW and defected ground structure (DGS), are presented. Compared with conventional substrate integrated waveguide (SIW) circuitry, QMSIW can contribute to a size reduction of nearly 75%. And DGS-loaded QMSIW can further improve the size miniaturization...
This paper presents a bandpass filter using half-mode substrate integrated waveguide (HMSIW) and modified U-shaped defected ground structure (DGS) slot-pairs. As both loaded into HMSIW, the modified DGS, compared with the original one, can contribute to improving the upper-side selectivity and expanding the stopband. Measured results are in good agreement with the simulations. In comparison with several...
In this paper, three different defected ground structure (DGS) patterns are proposed and loaded into quarter-mode substrate integrated waveguide (QMSIW) to implement three size-reduced bandpass filters. Using QMSIW can achieve a size reduction nearly 75% with respect to its substrate integrated waveguide (SIW) counterpart. Furthermore, the utilization of DGS can further reduce size over 40% compared...
In this paper, a substrate integrated waveguide -to- defected ground structure (SIW-DGS) cell is proposed and used to implement a symmetric modified doublet filter. The utilization of proposed SIW-DGS cell can increase the coupling strength of the master transmission path in filter, thus resulting in the enhancing of bandwidth. And the source-load coupling generated by SIW-DGS cells can also improve...
This paper presents a planar millimetre-wave (mmwave) band pass filter based on substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL) techniques. Four half wavelength mircrostrip resonators are imbedded in the SIW cavity to improve Q-factor. Due to the closed configuration which eliminates radiation loss, the filter presents a relatively low insertion loss. The proposed...
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