A New Approach of Applying Chebyshev Distribution of Series Fed Microstrip Antenna Array for Radar Applications (original) (raw)
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A Feeding Network with Chebyshev Distribution for Designing Low Side-lobe Level Antenna Arrays
VNU Journal of Science: Computer Science and Communication Engineering, 2017
This paper proposes a feeding network to gain low sidelobe levels for microstrip linear antenna arrays. The procedure to design a feeding network using Chebyshev weighting method will be proposed and presented. As ademonstration, a feeding network for 8×1 elements linear array with Chebyshev distribution weights (preset sidelobelevel of-25 dB) has been designed. The unequal T-junction power dividers have been applied in designing the feedingnetwork to guarantee the output powers the same as Chebyshev weights. The obtained results of the amplitudes ateach output port have been validated with theory data. The phases of output signals are almost equal at all ports. Thearray factor of simulated excitation coefficients has been given and compared with that from theory. It is observedthat the sidelobe level can be reduced to-22 dB. The proposed feeding network, therefore, can be a good candidatefor constructing a low sidelobe level linear antenna arrays.
REV Journal on Electronics and Communications, 2018
This paper proposes a novel high gain and low sidelobe level (SLL) linear microstrip array antenna for outdoor WLAN applications. The antenna consists of two main parts, which are a linear array and a reflector. The linear array comprises of 10 elements; those have been designed on Rogers RT/Duroid 5870tm with the dimensions of 422×100×10.15 mm3. To gain low SLLs, a series fed network was designed to have the output signals being proportional to the Chebyshev distributions (with preset SLL of -30 dB). Furthermore, Yagi antenna theory has been applied by adding directors above every single element to increase the directivity of the single element. The reflector has been constructed at the back of the proposed structure. Simulation results show that the array can provide high gain of 17.5 dBi and a low SLL of -26 dB. A prototype has been fabricated and measured. Good agreements between simulation and measurement data have been obtained.
Microstrip circular antenna array design for radar applications
International Conference on Information Communication and Embedded Systems (ICICES2014), 2014
The design and characteriztics of the double-sided microstrip circular antenna arrays are presented. The proposed array antenna are designed for single band at 5.25-5.75 GHz for C band and dual bands at 6.05-7 GHz and 9-10 GHz to support C band and X band Weather Radar applications respectively. The single band antenna shows omnidirectional radiation pattern with the gain value of 6.2 dBi at 5.5 GHz and dual band at 3.12 dBi at 6.5 GHz and 3.8 dBi at 9.5 GHz. The single band antenna array is placed on the top layer and the dual band antenna array is placed on both the top and bottom layers to obtain the desired antenna characteristics. The proposed single-sided single band and double-sided dual band antenna provides omnidirectional radiation pattern with high gain.
Low-Sidelobe-Level Series-Fed Microstrip Antenna Array of Unequal Interelement Spacing
Using the differential evolution algorithm (DEA), low-sidelobe-level (SLL) series-fed microstrip antenna arrays of unequal interelement spacing (IES) are investigated. The proposed design method can achieve conversion between the SLL and half-power beamwidth (HPBW). The constraint conditions for the IES and amplitude are set up, and the element size is also taken into account in the pattern function. Based on the solutions from the DEA, two types of series-fed antenna arrays of unequal IES, i.e., uniform amplitude and nonuniform amplitude arrays, are designed, fabricated, and measured. Measurement results show that 8-and 10-element series-fed antenna arrays of unequal IES and nonuni-form amplitude can achieve the SLL of −23.7 dB with HPBW of 9.7 • and the SLL of −25.3 dB with HPBW of 8.3 • , respectively. Compared to the traditional design methods, the proposed one can achieve the series-fed antenna array with a lower SLL and more narrow HPBW. Index Terms—Differential evolution algorithm (DEA), low side-lobe level (SLL), series-fed antenna array, unequal interelement spacing (IES).
A Taper Optimization for Pattern Synthesis of Microstrip Series-Fed Patch Array Antennas
—An EM based straight forward design and pattern synthesis technique for series fed microstrip patch array antennas is proposed. An optimization of each antenna element (λ /4-transmission line, λ /2-patch, λ /4-transmission line) of the array is performed separately. By introducing an equivalent circuit along with an EM parameter extraction method, each antenna element can be optimized for its resonance frequency and taper amplitude, so to shape the aperture distribution for the cascaded elements. It will be shown that the array design based on the multiplication of element factor and array factor fails in case of patch width tapering, due to the inconsistency of the element patterns. To overcome this problem a line width tapering is suggested which keeps the element patterns nearly constant while still providing a broad amplitude taper range. A symmetric 10 element antenna array with a Chebyshev tapering (-20dB side lobe level) operating at 5.8 GHz has been designed, compared for the two tapering methods and validated with measurement.
2021 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)
This paper investigates the design and evaluation of a set of 9 element, series-fed, patch arrays. A simple design approach and formulas are presented. This is followed by EM simulation results and lab measurement results for a set of prototypes operating over a range of frequencies relevant to millimeter wave (mmWave) systems. The simulation results based on the calculated array dimensions show good characteristics. The measured gains and radiation patterns agree well with the simulation results. Overall, the usefulness of the design strategy for application to antennas in the mmWave band is confirmed. Index Terms-Antenna arrays, microstrip antenna arrays, patch antennas, millimeter wave measurements.
IEEE Transactions on Antennas and Propagation, 2019
A microstrip feeding network (MFN) that implements a Dolph-Chebyshev current distribution is designed to feed a microstrip antenna array (MAA) operating in B2 LTE band. The study consists of three phases. In the first one, the elements of MAA are directly excited by equi-phase current sources complying with a Dolph-Chebyshev amplitude distribution to ensure a side lobe level (SLL) of −20 dB. Then, MAA is optimized for maximum forward gain. Finally, the input impedances of the elements of the optimized MAA and the element spacing are recorded. In the second phase, the MFN is considered to terminate at lumped loads with values equal to the input impedances of the respective elements of the optimized MAA, and is then optimized to achieve low standing wave ratio, high power efficiency, and output currents equal to those applied in the first phase by the current sources. All optimizations are performed with an improved particle swarm optimization variant in conjunction with CST. In the third phase, the optimized MFN is attached to MAA and is evaluated with CST. The purpose of this study is to show that it is possible to design an MFN that satisfies multiple requirements, without the knowledge of MAA geometry.
Microstrip patch antenna array with cosecant-squared radiation pattern profile
In this paper, the radiation pattern on either side of the main beam, which is created by a standard microstrip patch antenna, is configured to correspond to a cosecant-squared curve. The 8×2 antenna array comprises eight pairs of radiating elements that are arranged in a symmetrical structure and excited through a single common feedline. Interaction of the fields generated by each pair of elements contributes towards the overall radiation characteristics. The proposed array is shown to exhibit an impedance bandwidth of 1.93 GHz from 9.97 to 11.90 GHz for S 11-10 dB with a peak gain of 14.95 dBi. The antenna's radiation pattern follows a cosecant-squared curve over an angular range of ±60.91 •. The compact antenna array has dimensions of 106×34×0.813 mm 3. These characteristics qualify the antenna for radar applications at the X-band frequency.
International Journal of Advanced Computer Science and Applications, 2011
This paper demonstrates simple, low cost and high gain microstrip array antennas with suitable feeding techniques and dielectric substrate for applications in GHz frequency range. The optimum design parameters of the antenna are selected to achieve the compact dimensions as well as the best possible characteristics such as high radiation efficiency, high gain, etc. In this paper different microstrip array antennas such as series feed, corporate feed and corporate-series feed are designed, simulated, analyzed and compared regarding to the antenna performances. The designed antennas are 4x1, 4x1, and 4x2 arrays. The optimum feeding system is decided based on the various antenna parameters that are simulated. The simulation has been performed by using SO ET version V12.56 simulator which is a commercially available antenna simulator. The designed antennas provide return losses in the range of-4.21dB to-25.456dB at frequencies around 10GHz by using Taconic TLY-5 dielectric substrate with permittivity, εr= 2.2 and height, h =1.588 mm. The gain of these simulated antennas is found about 15dB and side lobe label is maintained lower than main lobe. Since, the resonance frequency of these antennas is around 10GHz, these antennas are suitable for X-band applications such as satellite communication, radar, medical applications, and other wireless systems.
Equal sidelobe patterns for microstrip patch antenna arrays
2017 IEEE International Conference on Antenna Innovations & Modern Technologies for Ground, Aircraft and Satellite Applications (iAIM), 2017
In this paper, we investigate the effect of microstrip patch element pattern on the linear array excitation required for equal sidelobes. Due to the pattern multiplication rule, the element pattern weights the array factor differently at different angles, therefore, excitation required for equal sidelobes will be different from the isotropic chebyshev case. Both broadside and scanning cases have been discussed and a method to obtain equal sidelobes for both cases has been given. Since, the microstrip patch element pattern, either in E-plane or H-plane, is dependent on its dimensions, the effect of changing the dimensions has also been discussed. It is shown that the broadside beamwidth(FNBW) of the new excitation is better than the Isotropic Dolph excitation.