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Microwave Resonators and Filters
Published in David A. Cardwell, David C. Larbalestier, Aleksander I. Braginski, Handbook of Superconductivity, 2022
Another common geometry is a feed line with a resonator or resonators coupled to the line as shown in Figure H2.1.7. Shown schematically is a capacitive coupling to the resonator using microstrip. The resonator can be λ/2 in length if the far end of the resonator is open or λ/4 if the end is shorted to ground, which is practical in CPW geometry but less easily implemented in microstrip or stripline. The response of the device is a dip at the resonance of the resonator S21(f)=α1−Qm/Qc1+2jQm(f−f0)/f,
Electrical Design, Simulation, and Testing
Published in Fred D. Barlow, Aicha Elshabini, Ceramic Interconnect Technology Handbook, 2018
Daniel I. Amey, Kuldeep Saxena
The stripline transmission line configuration is defined as a signal conductor surrounded by dielectric material between two reference planes. It may also be referred to as balanced stripline when the signal conductor is located equidistant from the reference planes. A stripline cross section is shown in Figure 2.6. The equation defining the impedance of this configuration is: Z0=60εrLn(4h0.7π W(0.8+tw))
S
Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
strictly positive real (SPR) strictly positive real (SPR) a rational transfer function G(s) with real coefficients such that ReG(s) 0 for Res 0 elements are accessed in order; if it is two, every other element is skipped. See also memory stride. stripline a transmission line formed by a printed conductor sandwiched between two conductive-backed dielectrics. strong inversion the range of gate biases corresponding to the "on" condition of the MOSFET. At a fixed gate bias in this region, for low drain-tosource biases, the MOSFET behaves as a simple gate-controlled resistor. At larger drain biases, the channel resistance can increase with drain bias, even to the point that the current saturates or becomes independent of drain bias. strong localization of light confinement of light inside a highly inhomogeneous medium due to very strong scattering. strong SPR function function. See strictly positive real
A Wideband High-Power Ridge Gap Waveguide Power Divider for High-Power Division Sub-Systems Applications
Published in IETE Journal of Research, 2023
Ahmed F. Elshafey, Ehab K. AbuSaif, Mahmoud A. Abdalla
Nowadays high-power microwave components have become essential in modern radars, communication and satellite systems [1]. Microwave passive components have many design constraints which depend on the requirements of power according to the required applications taking into account the material and good design performance. Thus, special material, components and configurations have been used to overcome the requirements of these high-power applications. There are many configurations which support high-power microwave passive components such as planar transmission stripline, substrate integrated waveguide (SIW), conventional hollow ridge gap waveguide. Planar stripline configuration can support power up to a few KWatts as it uses the air as dielectric whose electric field breakdown is 3×106 v/m [2]. Substrate integrated waveguide (SIW) has an advantage of high-quality factor, low loss and has moderate power handling capability up to 700 Watt [3]; hence it is used in many millimeter wave and microwave components, such as antennas [4] and filters [5] millimeter wave wireless systems [6]. On the other hand, hollow waveguide with air as a filling dielectric that supports higher power up to M Watts is not in continuous wave [7]. In addition to being bulk structures, waveguides are difficult and expensive in manufacturing when used in millimeter frequencies, due to small inner dimensions.
A Dual-Band Zero-Index Metamaterial Superstrate for Concurrent Antenna Gain Enhancement at 2.4 and 3.5 GHz
Published in IETE Journal of Research, 2022
Zain Haider, Muhammad U. Khan, Hammad M. Cheema
To demonstrate the use of the proposed ZIM as a superstrate with an antenna for increasing the gain, it is used with a wideband antenna with a unidirectional radiation pattern covering the 3.5 and 2.4 GHz bands. The designed antenna is a coplanar waveguide (CPW)-fed disc monopole antenna which is backed by a cavity as shown in Figure 8. The antenna having a radius of r = 16 mm and 50 ohms CPW is etched on one side of FR4 board which has a thickness of 1.5 mm. The stripline has a width Wf = 4 mm while the spacing between strip and ground plane is g = 0.33 mm. The ground plane has a length L = 10 mm and width W = 56 mm. There is a feed gap of h = 0.3 mm between the ground plane and the disc. A large ground plane with a copper layer thickness of 0.035 mm is placed underneath the antenna at a spacing of h3 = 25 mm which results in the unidirectional radiation pattern of the antenna towards the boreside. The space between the ground plane and the monopole antenna was selected to attain return loss better than −10 dB near 3.5 and 2.4 GHz, respectively. The standalone antenna's gain increases from 1.2 to 8.1 dB at 2.4 GHz and from 1.8 to 7.9 dB at 3.5 GHz by addition of the ground plane.
Compact Uniform Folded Section Rat-Race Couplers with Harmonic Suppression
Published in IETE Journal of Research, 2022
V. Chandra Prasad, Ramprabhu Sivasamy
The design procedure can be summarized as follows: Divide the physical length l of transmission line into many stripline pieces of length lh = λg/48 and lv = λg/32.Cascade them in the form of uniformly folded double section structure as shown in Figure 2(b) such that each folded double section corresponds to a λg/4 transmission line and therefore six double sections are cascaded to form an entire 6λg/4 transmission line of length l.A folded double section of length l1 is made up of 6lh+4lv where the cascaded horizontal arm length 6lh is equal to cascaded vertical arm length 4lv which corresponds to λg/8. This technique requires radius of core ring about 50% and area of core ring only about 25% compared to topology in Figure 1 while maintaining the circumference of ring and impedance of lines unaltered.