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Tem and Quasitem Modes: Basic Planar Transmission Lines
Published in Edward F. Kuester, Theory of Waveguides and Transmission Lines, 2020
A further commonly used planar transmission line is the coplanar waveguide (CPW) shown in Figure 8.20. Its positive conductor is a strip on a dielectric substrate, like the microstrip, but unlike the microstrip, its ground plane is in two parts and lies on the same side of the substrate as the strip. Thus, CPW is formed from a substrate with a ground plane on one side into which two identical slots have been cut, separated by a distance s. The mode of interest here has the two outer conductors at ground potential, while the center conductor is the positive reference, resulting in the field distribution shown in Figure 8.21. Coplanar waveguide combines the advantages of microstrip with additional ones: both series and shunt lumped elements can easily be connected to the line without disturbing the substrate.
Dual Band CPW Fed Antenna with Reduced SAR Rate by Embedding Comb Shaped EBG
Published in P. C. Thomas, Vishal John Mathai, Geevarghese Titus, Emerging Technologies for Sustainability, 2020
Roshni K. Rajan, V.R. Reshma, Mithu Mariam Cherian, Dana Mariam Jacob, K. A. Ansal
The proposed antenna design is a coplanar waveguide (CPW) structure. A CPW structure consists of a median metallic strip of deposited on the surface of a dielectric substrate slab with two narrow slits ground electrodes running adjacent and parallel to the strip on the same surface [4]. The antenna structure without EBG structure is shown in Fig. 27.1. The dimensions of the antenna is 34.5x25 mm with a substrate thickness of 1.6 mm. The substrate used is FR4 epoxy, known for its properties. FR-4 glass epoxy is a popular high-pressure thermoset plastic laminate grade having good strength to weight ratios. The material is known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These properties, along with good fabrication characteristics, gives utility to this grade for a wide variety of electrical and mechanical applications, with relative permittivity of 4.4.
Guided Wave Propagation and Transmission Lines
Published in Mike Golio, Commercial Wireless Circuits and Components Handbook, 2018
W.R. Deal, V. Radisic, Y. Qian, T. Itoh
Coplanar Waveguide (CPW), shown in Fig. 12.6b, consists of a signal line and two ground planes on a dielectric slab with metallization on one side. For a given substrate, characteristic impedance is determined by the signal line width, s, and the two gaps, w1 and w2. This structure often demonstrates better dispersion characteristics than microstrip. Additionally, three terminal devices are easily integrated into this uniplanar transmission line that requires no vias for grounding. For this reason, parasitics are lower than microstrip making CPW a good choice for high frequency operation where this is a primary design concern.
Segmental Lennard-Jones interactions for semi-flexible polymer networks
Published in Molecular Physics, 2021
Carlos Floyd, Aravind Chandresekaran, Haoran Ni, Qin Ni, Garegin A. Papoian
One could through substitution write the integrand in terms of five free variables in 2D, but this becomes an algebraically complicated expression that precludes exact integration. Instead, we first rotate the configuration so the shared plane coincides with the xy plane. Next, we write the integrand using the 6 (redundant) vector components , and to find the interaction energy in 2D. We have This integral has a complicated result which is provided in Appendix (Equation (A2)). The denominator of the result is proportional to . If and are parallel (or anti-parallel) in addition to coplanar, then one can show that , and hence the expression for U in the coplanar case is not defined.
A ultra wideband dual-polarized antenna with high isolation degree for passive radar application
Published in Electromagnetics, 2021
Miao Wang, Xiuwen Tian, Lizhong Song
In this paper, a planar linear log periodic folded dipole antenna with coplanar stripline at its input is adopted. Because the coplanar stripline is a balanced structure, Balun device is needed when the microstrip line is used to feed the antenna. The output terminal of UWB printed Balun uses vertically interconnected conductive vias to realize the connection of coplanar stripline and output terminal of plane parallel double line. The printed parallel double line is bent for 90 degrees, and the input terminal of Balun is set on the side of antenna printed circuit board. In the design of ultra wideband printed microstrip Balun, the main adjustment parameter is L_feed_1 and l_feed_2, which are used to realize impedance transformation and coupling relationship between antenna and Balun to ensure the radiation performance of log periodic folded dipole antenna. Here, the designed log periodic folded dipole antenna consists of 14 radiator elements with a width of 53 mm and the length of 137.5 mm. The scale factor of LPA is designed as follows:
Dynamic environment reconstruction using a pitch-and-go laser scanner
Published in Advanced Robotics, 2019
Tianwei Zhang, Yoshihiko Nakamura
This plane finding pipeline was firstly proposed by Jiang et al. [23] for LIDAR data, As LIDAR data are well organized (point clouds' width fixed, and received line by line), each scan line is split into straight line segments and then used as input in followed region growing phase. Gutmann et al. improved the scan line split method with a distribution test in [24], and demonstrated its application in humanoid robot applications. In [25], An et al. implemented scan line grouping with a Hokuyo laser scanner. They search the parallel line segments as seeds to start the line grouping. However, they ignore the situation of that, when the point clouds plane is not parallel to the sensor's pitching axis, the coplanar line segments are not parallel, see the red plane segment in Figure 5. That is to say, using the seed finding method from, [25, 26], the blue and green planes can be extracted but the red plane segments will be ignored. To cope with this problem, in this paper we proposed a new seed finding strategy.