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Relevant bibliographies by topics / Monopulse comparator

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Journal articles
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Academic literature on the topic 'Monopulse comparator'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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Journal articles on the topic "Monopulse comparator"

1

Chen, Yang, Yuehang Xu, Liulin Hu, Wei Tong, and Ruimin Xu. "A Broadband Passive Monopulse Comparator MMIC." IEEE Microwave and Wireless Components Letters 27, no. 4 (2017): 359–61. http://dx.doi.org/10.1109/lmwc.2017.2678439.

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Uyguroğlu, Rasime, Allaeldien Mohamed Hnesh, Muhammad Sohail, and Abdullah Y. Oztoprak. "Spurious radiation suppression in microstrip monopulse antenna." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 4 (2020): 791–99. http://dx.doi.org/10.1108/compel-10-2019-0384.

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Purpose This paper aims to introduce a new novel microstrip monopulse comparator system to reduce the spurious radiation from the comparator and the feed network for achieving better radiation performance. Design/methodology/approach Two substrate layers have been used for the microstrip monopulse comparator system. The feed network and the comparator circuits are on the first substrate layer and the microstrip array antenna is on the second layer. The elements of the array antenna are novel square four-sided narrow rectangular slot antennas built on a conducting plane. A commercially available computational software, CST microwave studio, has been used for the analysis of the system. Findings Two substrate layers have been used for the microstrip monopulse comparator system. The feed network and the comparator circuits are on the first substrate layer and the microstrip array antenna is on the second layer. The elements of the array antenna are novel square four-sided narrow rectangular slot antennas built on a conducting plane. A commercially available computational software, CST microwave studio, has been used for the analysis of the system. Practical implications The system is proposed for tracking moving targets. Originality/value Novel slot radiators are introduced as radiating elements in this paper. The antenna arrangement shields the comparator and the feed network circuits, reducing the spurious radiation significantly.

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Giunta, Giorgio, Leonardo Lucci, Renzo Nesti, Giuseppe Pelosi, Stefano Selleri, and Francesco Serrano. "A Comparison between Standard and Crossfeed Monopulse Radars in Presence of Rough Sea Scattering and Ship Movements." International Journal of Antennas and Propagation 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/126757.

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Monopulse radars are widely used in tracking systems, due to their relative simplicity and theoretical precision, but the presence of multipath impairs the tracking capabilities of these radars, especially when multipath signals are strong, as in a naval environment. A special monopulse setup, the crossfeed, has been proposed in the past to provide an automatic cancellation from smooth sea multipath. In this contribution, the performances of such a system are analyzed in presence of rough sea scattering and compared with those of a standard monopulse setup. Particular attention is devoted to performance degradations due to possible phase errors in the passive network implementing the comparator and due to ship rolling and pitching. This latter requires a full 3D monopulse simulator for its correct evaluation.

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Alamdar, Saeid, Karim Mohammadpour-Aghdam, Hossein Khalili, and Mahmoud Mohammad-Taheri. "A miniaturized broadband monopulse comparator with all DELTA channels nulling in Ku band." International Journal of Microwave and Wireless Technologies 10, no. 9 (2018): 1035–41. http://dx.doi.org/10.1017/s1759078718001071.

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AbstractA compact monopulse comparator with complete nulling in all DELTA channels is designed and fabricated. The proposed comparator has small dimension and consists of interconnections of four broadband branch-line couplers and several 90° phase shifters with multistage Schiffman coupled-lines. This comparator has been characterized by its eight-portS-parameters to generate the SUM and DELTA channel frequency responses. Over 30-dB null depth was achieved in DELTA channels across the SUM channels in pass band from 14.8 to 18.2 GHz frequency range.

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Si, Li-Ming, Yong Liu, Yongjun Huang, and Weiren Zhu. "Ka-Band Slot-Microstrip-Covered and Waveguide-Cavity-Backed Monopulse Antenna Array." International Journal of Antennas and Propagation 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/707491.

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A slot-microstrip-covered and waveguide-cavity-backed monopulse antenna array is proposed for high-resolution tracking applications at Ka-band. The monopulse antenna array is designed with a microstrip with2×32slots, a waveguide cavity, and a waveguide monopulse comparator, to make the structure simple, reduce the feeding network loss, and increase the frequency bandwidth. The2×32slot-microstrip elements are formed by a metal clad dielectric substrate and slots etched in the metal using the standard printed circuit board (PCB) process with dimensions of 230 mm × 10 mm. The proposed monopulse antenna array not only maintains the advantages of the traditional waveguide slot antenna array, but also has the characteristics of wide bandwidth, high consistence, easy of fabrication, and low cost. From the measured results, it exhibits good monopulse characteristics, including the following: the maximum gains of sum pattern are greater than 24 dB, the 3 dB beamwidth of sum pattern is about 2.2 degrees, the sidelobe levels of the sum pattern are less than −18 dB, and the null depths of the difference pattern are less than −25 dB within the operating bandwidth between 33.65 GHz and 34.35 GHz for VSWR ≤ 2.

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Chen, Zhenhua, Peng Teng, and Jianru Wang. "An E-Band Beam Sharpening Antenna Based on Monopulse Comparator." IEEE Access 9 (2021): 73262–70. http://dx.doi.org/10.1109/access.2021.3081354.

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7

Liu, Yi, Hu Yang, Yan He, and Jiang Zhu. "Compact monopulse sum‐difference comparator based on double‐layer substrateintegrated waveguide." Electronics Letters 53, no. 22 (2017): 1477–79. http://dx.doi.org/10.1049/el.2017.2647.

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Jargalsaikhan, Nyambayar, Jae-Hoon Bang, Seong-Gon Choi, Bierng-Chearl Ahn, and Andrii Gorshkov. "A New High-Performance Monopulse Feed with a Simple Comparator Network." International Journal of Antennas and Propagation 2019 (June 27, 2019): 1–7. http://dx.doi.org/10.1155/2019/8230641.

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This paper presents a new high-performance five-element monopulse feed with a simple comparator network for Cassegrain reflector applications. The radiating element is a tapered dielectric rod fed by a circular waveguide which is in turn excited by a printed dipole. The center element is used for the sum pattern, while top and bottom elements are used for the elevation difference pattern, and left and right elements for the azimuth difference pattern. Out-of-phase excitation for the difference pattern is obtained by antisymmetrically placing two dipoles and combining their outputs with a power combiner. The optimally designed feed has been fabricated and measured. Measurement shows that the feed has the maximum sum pattern gain of 16.8 dBi, the difference pattern null depth of –21 dBi, and the reflection coefficient of less than –10 dB over 13.9–16.7 GHz.

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Kim, Jeong-Geun, Sanjay Raman, and Gabriel M. Rebeiz. "A 24 GHz Amplitude Monopulse Comparator in 0.13 $\mu$m CMOS." IEEE Microwave and Wireless Components Letters 18, no. 9 (2008): 632–34. http://dx.doi.org/10.1109/lmwc.2008.2002488.

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Kim, Dong-Yeon, Youngjoon Lim, Chae-Hyun Jung, Chang-Hyun Park, and Sangwook Nam. "A Design of Wideband Monopulse Comparator for W-Band mm-Wave Seeker Applications." Journal of Korean Institute of Electromagnetic Engineering and Science 27, no. 2 (2016): 224–27. http://dx.doi.org/10.5515/kjkiees.2016.27.2.224.

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Dissertations / Theses on the topic "Monopulse comparator"

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Oliver, John Marcus. "3D Micromachined Passive Components and Active Circuit Integration for Millimeter-wave Radar Applications." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77049.

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The development of millimeter-wave (30-300 GHz) sensors and communications systems has a long history of interest, spanning back almost six decades. In particular, mm-wave radars have applications as automotive radars, in remote atmospheric sensing applications, as landing radars for air and spacecraft, and for high precision imaging applications. Mm-wave radar systems have high angular accuracy and range resolution, and, while susceptible to atmospheric attenuation, are less susceptible to optically opaque conditions, such as smoke or dust. This dissertation document will present the initial steps towards a new approach to the creation of a mm-wave radar system at 94 GHz. Specifically, this dissertation presents the design, fabrication and testing of various components of a highly integrated mm-wave a 94 Ghz monopulse radar transmitter/receiver. Several architectural approaches are considered, including passive and active implementations of RF monopulse comparator networks. These architectures are enabled by a high-performance three-dimensional rectangular coaxial microwave transmission line technology known as PolyStrataTM as well as silicon-based IC technologies. A number of specific components are examined in detail, including: a 2x2 PolyStrata antenna array, a passive monopulse comparator network, a 94 GHz SiGe two-port active comparator MMIC, a 24 GHz RF-CMOS 4-port active monopulse comparator IC, and a series of V- and W-band corporate combining structures for use in transmitter power combining applications. The 94 GHz cavity-backed antennas based on a rectangular coaxial feeding network have been designed, fabricated, and tested. 13 dB gain for a 2 x 2 array, as well as antenna patterns are reported. In an eï¬€ort to facilitate high-accuracy measurement of the antenna array, an E-probe transition to waveguide and PolyStrata diode detectors were also designed and fabricated. AW-band rectangular coaxial passive monopulse comparator with integrated antenna array and diode detectors have also been presented. Measured monopulse nulls of 31.4 dB in the ΔAZ plane have been demonstrated. 94-GHz SiGe active monopulse comparator IC and 24 GHz RF-CMOS active monopulse comparator RFIC designs are presented, including detailed simulations of monopulse nulls and performance over frequency. Simulations of the W-band SiGe active monopulse comparator IC indicate potential for wideband operation, with 30 dB monopulse nulls from 75-105 GHz. For the 24-GHz active monopulse comparator IC, simulated monopulse nulls of 71 dB and 68 dB were reported for the azimuthal and elevational sweeps. Measurements of these ICs were unsuccessful due to layout errors and incomplete accounting for parasitics. Simulated results from a series of rectangular coaxial power corporate power combining structures have been presented, and their relative merits discussed. These designs include 2-1 and 4-1 reactive, Wilkinson, and Gysel combiners at V- and W-band. Measured back-to-back results from Gysel combiners at 60 GHz included insertion loss of 0.13 dB per division for a 2-1 combination, and an insertion loss of 0.3 dB and 0.14 dB for "planar" and "direct" 4-1 combinations, respectively. At 94 GHz, a measured insertion loss of 0.1 dB per division has been presented for a 2-1 Gysel combination, using a back-to-back structure. Preliminary designs for a solid-state power amplifier (SSPA) structure have also been presented. Finally, two conceptual monopulse transceivers will be presented, as a vehicle for integrating the various components demonstrated in this dissertation.<br>Ph. D.

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Book chapters on the topic "Monopulse comparator"

1

Reddy, Annapureddy Venkata, and V. G. Borkar. "Design and Simulation of Microstrip Branch Line Coupler and Monopulse Comparator for Airborne Radar Applications." In Learning and Analytics in Intelligent Systems. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24318-0_2.

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Conference papers on the topic "Monopulse comparator"

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Kumar, Hemant, Girish Kumar, Yogesh Verma, and Prashant Kumar Mishra. "Compact waveguide monopulse comparator at Ka-band for monopulse tracking." In 2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2016. http://dx.doi.org/10.1109/aps.2016.7696385.

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Das, Tanuja, and Vivek Kumar Singh. "Broadband waveguide monopulse comparator at X-band." In 2017 International Conference on Innovations in Electronics, Signal Processing and Communication (IESC). IEEE, 2017. http://dx.doi.org/10.1109/iespc.2017.8071888.

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Junwei, Xie, Zhang Xuchun, Tong Chuangming, and Zhang Xiaokuan. "A Double-sided Broad-band Eight-Port Monopulse Comparator." In 2007 Asia-Pacific Microwave Conference - (APMC 2007). IEEE, 2007. http://dx.doi.org/10.1109/apmc.2007.4554673.

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Xu, Xin, Jiro Hirokawa, and Makoto Ando. "Double-layered plate-laminated waveguide monopulse comparator in E-band." In 2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2016. http://dx.doi.org/10.1109/aps.2016.7696558.

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Huang, Guan-Long, Shi-Gang Zhou, Tan-Huat Chio, and Tat-Soon Yeo. "Two types of waveguide comparator for wideband monopulse antenna array application." In 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR). IEEE, 2015. http://dx.doi.org/10.1109/apsar.2015.7306203.

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Hsien-Shun Wu, Chao-Wei Wang, Jian-Guo Ma, and Ching-Kuang Tzuang. "A K-band CMOS monopulse comparator incorporating the phase-invertible variable attenuator." In 2013 IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF). IEEE, 2013. http://dx.doi.org/10.1109/sirf.2013.6489495.

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Singh, Yatendra Kumar, and Ajay Chakrabarty. "Design and Sensitivity Analysis of Highly Compact Comparator for Ku-Band Monopulse Radar." In 2006 International Radar Symposium. IEEE, 2006. http://dx.doi.org/10.1109/irs.2006.4338149.

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8

Varghese, J. "Computer aided design of planar waveguide monopulse comparator for low height airborne antennas." In Radar Systems (RADAR 97). IEE, 1997. http://dx.doi.org/10.1049/cp:19971730.

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9

Ding, Kejia, and Ahmed A. Kishk. "Compact Comparator for 2-D Monopulse Array Based on Novel Eight-Port Coupler." In 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. IEEE, 2019. http://dx.doi.org/10.1109/apusncursinrsm.2019.8888897.

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Ding, Kejia, and Ahmed A. Kishk. "Compact Comparator for Dual-Polarized Monopulse Array Based on Novel Eight-Port Coupler." In 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. IEEE, 2019. http://dx.doi.org/10.1109/apusncursinrsm.2019.8889305.

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