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A broadband rat-race coupler is proposed with planar configuration. Stepped-impedance and coupled transmission lines are utilized. Due to the symmetric structure, it is easy to design such a component by the even-/odd-mode analysis. A prototype is optimized to demonstrate our idea. The central frequency is 1.37 GHz with a 52% relative bandwidth. The return loss and port isolation are both better than...
This paper presents the analysis of a via hole contact between a microstrip and stripline for potential applications in multilayer antennas. A full-wave analysis based on the 3D-TLM method is used to model the transition. The effect of the via and the clearance hole shape and size were discussed. Simulations obtained using this analysis were compared to the measured data.
In this paper, a microstrip patch is extended to form planar crossover by suitably choosing the feed locations for orthogonal polarizations. The overlap is modified as a hexagonal patch which offers an isolation of −35 dB at 2.4 GHz. Crossover is a part of butler matrix, which is finds applications in beamforming networks. The proposed crossover is compared for reflection and transmission characteristics...
In this paper, a planar crossover derived from circular patch with two orthogonal sets of feed is presented. The electrical length of the microstrip circular patch antenna is increased by incorporating slots at the center achieving area reduction and better isolation in comparison with parent crossover. The proposed crossovers are analyzed using ANSYS HFSS, and an isolation better than −22 dB and...
In this paper, a broadband waveguide WR-15 to microstrip-line (MSL) transition is proposed. The transition is structured on a multi-layered liquid crystal polymer (LCP) substrate. The substrate has two LCP layers and a metal back-short block is mounted on the substrate and is connected to ground plane. The WR-15 waveguide is directly connected to the substrate and is coupled with the MSL via rectangular...
Electromagnetic Band Gap Structures have been grown into the most notable framework by virtue of their superior efficacy, less intricacy in fabrication, and unified integration with the monolithic microwave integrated circuits (MMICs). In this epistle, in sequence of our previous investigation, a certain number of novel designs of EBGS are proposed and characterized with some rigorous parametric studies...
In many papers, compact band-reject filters are realized by associating microstrip lines with complementary split ring resonators (CSRR). These studies assume that the periodicity of CSRR is perfect. However, a margin of error, related to the precision of manufacturing techniques, appears when operating these filters. In this paper, the robustness of the behavior of these filters is studied according...
This paper presents electrostatic DC-contact RF-MEMS cantilever switches based on an alternative and cheap fabrication process on a PCB, suitable for monolithic integration with other elements on the same substrate. The switches are implemented on a Rogers 4003c substrate, based on a 1µm-thick copper cantilevers, with an average voltage actuation of 90V. Stable cantilevers have been demonstrated in...
This paper presents a compact 3-dB coupler on a dual substrate layer with a rectangular slotted microstrip ground plane. The coupler is designed for operating frequency at 2.45 GHz using an inexpensive FR-4 substrate. A compact coupler design with dimension of 19 mm × 7.5 mm offers a size reduction of 62 % while simultaneously enhanced the bandwidth to 42.7 % compared to a conventional coupler.
The high-frequency characteristics of a via connection that connects two infinite microstrip lines on either side of a ground plane is examined. The assumption of infinite lines allows for a semi-analytical solution, where the lines are treated essentially in closed form. This results in an accurate solution that captures all of the physics of high-frequency wave excitation on the lines by the via...
In this paper, we present design, analysis and simulation of a front-end of a transceiver which works in Ku-band (15.5 GHz) based on multi-layer LTCC (low temperature co-fire ceramic) technology. The superheterodyne structure is selected and some GaAs bare chips from Hittite company such as mixer, power amplifier, LNA, drive amplifier are used in this MCM (multi-chip module). Some considerations about...
Synthesis of the sizes of the irregular relief coupled microstrip lines, which conductors are carried out on orthogonally placed substrates, is carried out. The synthesis algorithm is based on a method of "growing" of cross-section structure on the set primary parameters in the form of capacities matrixes.
Printed circuit board antennas are often designed to incorporate active elements such as high power amplifiers in order to boost the EIRP of the antenna [1]. Active devices however generate heat. Thus it becomes necessary to employ cooling mechanisms to ensure proper operation of the active antenna. For most applications heat sinks are used for cooling. The drawback of using heat sinks however is...
In this paper a system of three coupled microstrip lines is analyzed and its design parameters are calculated by using the method of lines. Based on this system an improved coupler is designed, realized, and tested. The improvement lies mainly in calculating the coupling length accurately taking the exact value of the effective dielectric constant, instead of using an approximate formula.
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