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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...
The design of a reconfigurable dual-band Dual Behavior Resonator (DBR) is presented. It is based on the use PIN diodes to select one passband among the three available with such a topology. The filter to be designed is aimed at addressing one GSM-band (1.8 GHz), one UMTS-band (2.1 GHz) and one Wi-Fi-band (2.45 GHz). Demonstrators were designed and realized in microstrip technology using lumped and...
This paper studies the dispersive effect on slow-wave coplanar waveguide characteristic impedances when the access size varies. A comparison between measurements having the same geometric dimensions except for the accesses allows confirming that the access size and geometry is crucial for a good electrical parameter extraction, when millimeter frequencies are targeted.
A dual-band bandpass filter topology based on coupled-lines is presented. In the topology, two identical coupledlines are cascaded in series and duplicated in parallel. There are then ended with another two identical coupled-lines. The dual-path structure exhibits a 2nd order dual-band response with three transmission zeros that separate the passbands from each other, and from the rejection band....
Cascaded-rings bandpass filter is presented with dissociated transmission zeros. While the position of the transmission zeros is largely depending on the coupled-line sections of the rings, less coupling level is required in some of the coupled-line sections, and the design will not be limited to some fixed values of impedance throughout the topology. This improves the degree of the liberty in designing...
In this paper, a design of patch array antenna for WiMAX (Worldwide Interoperability Mobile Access) and WLAN (Wireless Local Area Network) applications is proposed. The antenna structure consists of a microstrip patch array of 3 by 3 OCFA (off centered feed array) that is coaxial feed through type antenna with Unbalanced characteristic whereby the feed line situated off centered λ/3 to the left and...
Thin film capacitors are very interesting option to electrolytic capacitors, because they are simple, compact in structure and effective for fabrication of high frequency devices. Thin film coating capacitors also improved processing characteristics and better dielectric strength. This paper reports the development of thin film capacitors for DC filtering in AC/DC converter application. The design...
A tuning concept of a quarter wavelength side-coupled ring resonator is proposed by introducing varactor diode as tuning device at the four corners of the ring resonator to allow modification of the ring electrical length. This modification is typically used to allow the variation of the capacitance as a function of bias voltage thereby resulting in center frequency tuning. A complete tunable circuit...
Topologies of two microwave bandpass filters are presented. The first topology comprises of a single mode ring resonator which is fed along one of its quarter-wavelength sides. The second topology is constructed based on the first topology whereby two series cascaded ring resonators with a quarter wavelength coupled line in the middle of the structure to obtain a 4th order bandpass filter with a good...
A novel fourth order coupled lines filter topology is presented based on two parallel paths containing quarter-wavelength coupled lines. Three identical coupled lines are combined in series in each path to form a ring structure. This configuration leads to the compactness of a highly selective filter. The proposed filter is designed for wideband applications whose center is at 3 GHz with a fractional...
Automated Complementary Metal Oxide Semiconductor (CMOS) logic circuit design leads to the reduction in costs associated with manpower and manufacturing time. Conventional methods use repetitive manual testing guided by Logical Effort (LE). LE provides an easy way to compare and select circuit topologies, choose the best number of stages for path and estimate path delay. In this paper, we propose...
A novel topology of wideband bandpass filter is proposed. The filter is composed of two identical paths of coupled lines connected in parallel. The overall frequency response of the filter can be adjusted by varying the impedance value of the filter elements leading to possibilities to obtain the desired bandwidth of the passband. The proposed topology is used to design a wideband third order filter...
A center-frequency-tuned microwave quarter-wavelength side-coupled ring resonator based on the varactor diodes is presented. Four identical varactor-based tuning circuits are applied at every entry point of the coupled-lines in the ring resonator to give capacitance effects and cause an increment of electrical length and thus results in tuned center frequency at the desired frequency band. The complete...
An original filter topology based on dual-path parallel coupled-lines is presented. Two identical coupled-lines are combined in parallel to result in a wideband bandpass response. Two transmission zeros are also resulted thanks to the cancellation effect in the dual-path connection. It is also shown that the use of asymmetrical coupled lines helps in giving more flexibility in obtaining higher coupling...
A tuning circuit based on the use of varactor is presented to tune the electrical length of an open-circuited stub. The complete circuit with the choice of components is given in the paper, along with its simulation results. The proposed circuit is realized using microstrip technology on FR4 substrate. The experimental results are found to be of good agreement with the ones obtained from simulation...
An electric circuit representation of a side-coupled single-mode microwave ring resonator is presented. The ring resonator is coupled to the feed lines along a quarter-wavelength of its side to exhibit a single-mode bandpass response with two transmission zeros. Using the properties and the circuit model of a coupled-line, the complete diagram of the ring resonator is derived. The diagram will be...
A single-mode ring resonator which is fed along one of its quarter-wavelength sides is presented. The resonator's response presents transmission zeros whose frequencies can be modified by adjusting the line impedance of the ring and the coupling level of the feeding coupled-line. The proposed topology introduced much simpler bandpass filter configuration and reduced the number of control parameters...
An odd number of one-wavelength ring resonators are proposed to be directly series-connected along a quarter-wavelength of their sides to exhibit a bandpass response with very high rejection level. As each ring presents a dual-mode response, the order of the overall bandpass response will be equal to two times the number of rings being used. Furthermore, the pseudo-elliptic characteristics of the...
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