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A second- and a third-order filters are presented based on the single-side-coupled ring resonator topology. A simple way to obtain the second-order bandpass response is proposed by adding a quarter-wavelength coupled line immediately at the coupled-line side of the resonator, which forms a half-wavelength resonator, hence an extra pole. Using the similar idea, an extra pole is obtained from a half-wavelength...
A single ring resonator dual-band bandpass filter using quarter-wavelength resonators suitable for WLAN application is presented in this paper. Both side of ring resonator consist of quarter-wavelength parallel coupled-lines. In further reducing the size of the filter, meander structure is applied to an existing design. Using different number of meander slots, a microstrip dual-band single ring resonator...
A rectangular shaped defective ground structure (DGS) is proposed to enhance the response of an existing design of a dual-band bandpass filter topology. In this paper, the filter design is based on parallel-coupled lines connected to transmission lines. The filter consists of characteristics impedances of the transmission line represented by Zr, even-mode, Zre and odd-mode, Zro. The variation of the...
This paper describes the characteristics of magnetic resonant coupling at 27.12 MHz for low voltage wireless power transfer system (WPT). Based on spiral magnetic inductance coupling, four single layer air coils are mutually coupled and parameterized to represent power coil, transmitter, receiver and load. The system was simulated using electromagnetic full wave simulator and analysis was performed...
A combination of Z-score and Neural Network is use as part of the FSR vehicles classification system. The classification performance of different inputs to NN is evaluated. The input of NN will be the data that give positive number of Z-score and Z-score values. The results of vehicle classification for three different frequencies which are fixed at 64 MHz, 151 MHz and 434 MHz are presented and discussed...
This paper presents a single ring resonator using multilayer technique for dual-band bandpass filter. The resonator is composed of two resonators with each one having a quarter-wavelength coupled-line connected in series to a transmission line. The two resonators are arranged in parallel to form a single ring dual-band bandpass filter topology. The controlling impedance parameters of this ring are...
A single-side-access ring resonator for bandpass filter is presented. The characteristics of the resonator were investigated in terms of width and gap of the ring line and coupled-lines on microstrip. It is found that the frequency response and bandwidth of the resonator can be controlled by controlling the width and gap of the ring elements. The resonator was tested on Tachonic substrates and simulated...
This paper proposed a dual-band ring filter using two identical microstrip dual-mode ring resonators. The rings are cascaded in series side-by-side via a single quarter wavelength coupled-line forming two transmission poles which are distributed in each passband. Meanwhile, the coupled-line positioned in between the two rings help to create the center transmission zero which can be used to control...
This paper presents two microwave bandpass filter topologies which are based on two different ways of series-cascading two quarter-wavelength side-coupled ring resonators. In the first topology, a quarter-wavelength impedance inverter is used to connect the two rings. As each ring gives two poles, a 4th order bandpass filter is obtained from the topology. The impedance inverter is replaced by a quarter-wavelength...
This paper proposes a novel topology of one-wavelength microstrip ring resonator which integrates a single quarter-wavelength parallel coupled-line as one of its input/output points. Such topology results in a single mode response with zero transmission at both sides of the bandpass. A complete simplified diagram of the proposed topology is developed and presented in this paper. An example of realization...
A dual-mode dual-band bandpass filter topology is proposed by connecting two quarter-wavelength parallel coupled-lines to two half-wavelength lines creating a dual-path structure. Based on the topology, the characteristics of the filter response such as the bandwidth and the separation between the bands can be controlled by varying the even- and odd-mode impedances of the coupled-lines and the line...
Dual-mode microstrip ring filter whose center frequency is shifted to a lower frequency using four additional open stubs is presented. Nevertheless, the shifted dual-mode ring filter has to face an in-band matching problem in its passband response. A possible solution to the problem is proposed by modifying the line impedance of the ring filter. In this paper, a frequency shifting of about 33.33 %...
A topology of a dual-band filter is presented based on a series-combination of two identical ring resonators. The circumference of each ring is equal to one wavelength taken at the center frequency between the two chosen operating frequencies. The control of the filter response in terms of bandwidth and separation between the operating frequencies can be done by varying the impedances of the filter...
Microwave filter with pseudo-elliptic response is realized using coplanar waveguide technology. Based on the quarter-wavelength side-coupled ring topology, the filter presents a second order bandpass response with transmission zeros in its out-of-band frequencies. The inter-ground distance of the coplanar waveguide (CPW) lines is set to be 3.4 mm which is about twice the thickness of the substrate...
The great flexibility of three-dimensional multilayer technology which newly developed spiral inductors have been designed and optimized. The chosen approach for the spiral implementation loaded is a coplanar wave guide (CPW) transmission lines. The multilayer spiral inductors are very compact and having resonant frequency band between 5 GHz to 70 GHz. The area of multilayer inductor is nearly four...
Abstract. Postnatal development of T-cell subpopulations in the oviduct was investigated in the Dekalb strain of the White Leghorn chicken by using an immunohistochemical method. T-lymphocytes first infiltrated the oviduct at 5 weeks. The number of T cells peaked at 15 weeks in the magnum, isthmus and uterus, and at 19 weeks in the infundibulum and vagina. The epithelium of the oviduct contained both...
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