The 8x8 butler matrix network has been constructed on a single board surface of an. This version of the led backpack is designed for the 1. Find the angle of the main beam for each antenna element at f2. The matrix is composed of four 3db90 directional couplers and two 45 phase shifters. Optomicrowave, butler matrixes based frontend for a. Design and implementation of singlelayer 4x4 and 8x8 butler matrices for multibeam antenna arrays article pdf available in international journal of antennas and propagation 20191. A backtoback placed bilayer microstrip structure has been proposed to avoid using crossover. Led displays are often packaged as matrixes of leds arranged in rows of common anodes and columns of common cathodes, or the reverse. He reported a uniform narrowbeam switched array antenna system of. Since the simulation is performed considering ideal phase shifters, couplers and crossovers the result from physical implementation can be much worse. The max7219 chip makes it easier to control the dot matrix, by just using 3 digital pins of the arduino board. Design of 4x4 butler matrix by combining individual microwave blocks fig. Pdf design and implementation of singlelayer 4x4 and 8x8 butler.
A butler matrixfed array can cover a sector of up to 360 depending on element patterns and spacing. Design of an 8x8 crossconfiguration butler matrix with interchangeable 1d and 2d arrays. Controlling a dot matrix led display with a microcontroller. A blue line shows how to obtain n beam patterns of an existing 8x8 butler matrix, and a red line shows n1 additional beam patterns and 2n1 beams obtained by using this switch network are shown on the right side. Zmatrix impedance matrix of the ports of a system, satisfies the equation vzi. Butler matrix design in preparation for this work, utler a wideband 8x8 butler matrix. Butler was an employee of sanders associates in nashua, new hampshire, which is now part of bae. This image or media file may be available on the wikimedia commons as file. The 8x8 architecture for butler matrix provided with reliable outputs and boardlevel implementation is less complex compared to a larger sized array.
These multiple and simultaneously available beams can be generated through beamforming networks such as the butler matrix, of which its design is the focus of this thesis. Design and implementation of a wideband beamforming network. By using the narrow beams available from the butler matrix, it is possible for a receiver to increase the gain in the. In this paper, the design of a planar new 8x8 butler matrix were designed to form the. The butler matrix is composed of microstripslot coupled 3db couplers 8 and 45. Optimum design of butler matrix array is given below fig. The 8x8 butler matrix analysis by using the developed signal flow. These beams are linearly independent combinations of the array element patterns. Fmcw radar with butler matrix for beam steering of phased. This version of the led backpack is designed for these very cute miniature 8x8 matrices. Four of the analog pins are used as digital inputs 16 through 19. While the license of this file may be compliant with the wikimedia commons, an editor has requested that the local copy be kept too. Design of butler matrix integrated with antenna array for beam forming fitri yuli zulkifli1, nurul chasanah2, basari3, dan eko tjipto rahardjo4 1,2,3,4antenna, propagation and microwave research group amrg dept.
The simulated phase responses when port 1 is excited and phase. Sakakibara, 8x8 phased series fed patch antenna array at. Abstract this paper presents the design of an 8x8 butler matrix in microstrip technology used to superimpose orbital. By employing passive devices in a butterfly layout configuration, a completely planar microstrip 8x8 butler matrix to perform in the ism band of 2. In preparation for this work, a wideband 8x8 butler matrix using ro3003. Microstrip ehf butler matrix design and realization. The butler matrix was first described by jesse butler and ralph lowe in a paper titled beamforming matrix simplifies design of electronically scanned antennas, electronic design, volume 9, pp. Jun 27, 2017 a butler matrix beamforming network schematic left and final geometry right. The display used is a commercially available pcb mount 8 x 8 dot matrix rgb led display, with a total of 192 individual leds that are controlled by 32 control signals. Design and implementation of a 4x4 butlermatrix switched. The butler matrix is often utilized as part of the beam forming network for a phased array. The butler matrix performs a spatial fast fourier transform and provides 2n orthogonal beams. As can be seen in figure 5, the 4x4 butler matrix used includes two crossover couplers, 4 blocks of hybrid couplers 3db 90 and finally 2 phase shifters 45.
Design procedures the schematic of a 4 x 4 two layer butler matrix is shown in fig. A butler matrix fed array can cover a sector of up to 360 depending on element patterns and spacing. Printed 4x4 butler matrix for beamsteering and mimo applications in 2. Journal of telecommunications, volume april 68 optimum design. Weinschel butler matrix ximulates beamforming network to missionproof the rollout of wifi devices and services. Electrically synthesized beam pattern for and 8x8 butler matrix for adjacent elements. Dissertation steerable antennas for automotive communication systems 2 abstract this research project undertakes a comprehensive analysis of rf beamforming techniques for design, simulation, fabrication, and measurement of butler matrix and rotman.
Its purpose is to control the direction of a beam, or beams, of radio transmission. This work proposes a new 16x16 butler matrix with wideband operation and compact size. It is clearly seen how the functionality of generating a controlled. Model 402, 8x8 butler matrix the model 402 is an eight antenna element to eight mode butler matrix modeforming network. Rahim wireless communication centre, fakulti kejuruteraan elektrik.
In order to further millimeterwave research in this area, this thesis presents a modified configuration of the butler matrix in siw that is physically reconfigurable. Suarez also used a butler matrix in his research 15,16. Easytofabricate microstrip layout topologies are designed and constructed. Product lines include programmable step attenuators including pin, fet, relay and edgeline technologies, resistive power splitters, dividers, high power up to watts and low passive im fixed attenuators, coaxial terminations, continuously. Fortunately, such a network, better known as butler matrix, has been introduced in 23. Guide for 8x8 dot matrix max7219 with arduino random. Butler matrix has been implemented with various techniques such as waveguide, microstrip, multilayer microstrip, suspended stripline, cpw etc. Wideband butler matrix in microstripslot technology. Printed 4x4 butler matrix for beamsteering and mimo. A simple switchedbeam antenna array based on a 8x8 butler matrix network conference paper pdf available july 2006 with 1,111 reads how we measure reads. The aten vancryst vm0808h 8x8 hdmi matrix switch is a distinct hdmi solution that offers an easy and affordable way to route any of 8 hdmi video sources to any of 8 hdmi displays, and view them in any arrangement. A new compact layout topology for the 8x8 butlermatrix beamforming network is presented in this work. Model rfp4339 operates in the 815980 mhz frequency range with an amplitude balance of 0.
Product lines include programmable step attenuators including pin, fet, relay and edgeline technologies, resistive power splitters, dividers, high power up to watts and low passive im fixed attenuators, coaxial terminations. Pdf design and implementation of singlelayer 4x4 and 8x8. It serves to provide the necessary phase and power division necessary to the antenna elements for beam steering, depending on which input port of the matrix is selected. Implementation and measurements by designing a beamforming network capable to produce n different bi, a set of n different beams can be easily implemented. Features broad operating frequency range optimized for the 2. Ready for the future of highdefinition video switching, the vm0808ha is ideal for applications where the routing of 4k digital signals is required, such as in. When compared to a system involving direct, single ended ampli. Allam 11122014 lectures 2 1show that a two element array oriented on yaxis with inter element spacing of d2. Design of butler matrix integrated with antenna array for. Steerable antennas for automotive communication systems. Designing a butler matrix beamforming network with rf modeling. I think the best option is to buy the dot matrix with the max7219 chip as a module. The 16 pins of the matrix are hooked up to 16 pins of the arduino or genuino board. Electromagnetic wavelength introduction the objective of this project is to explore butler matrices for use as antenna beamforming in the xband and to simulate, test, and analyze the.
To expand operational bandwidth of the butler matrix, a threebranch line directional coupler has been employed as. The 8x8 butlermatrix network has been constructed on a single board surface of an. Butler matrix is divided into equal parts before the signal is ampli. Wideband butler matrix in microstripslot technology siti zuraidah ibrahim and marek e. A simple switchedbeam antenna array based on a 8x8 butlermatrix network conference paper pdf available july 2006 with 1,111 reads how we measure reads. The uploader or another editor requests that a local copy of this file be kept. Pdf singlelayer 4x4 and 8x8 butler matrices bms that operate in the l and s bands are implemented in this paper. The 8x8 butler matrix design presented in this example is centered at 10 ghz.
Optomicrowave, butler matrixes based frontend for a multi. Kr101772206b1 the beamforming capability improved butler. A butler matrix beamforming network schematic left and final geometry right. The 3bit counter continuously counts from 0 to 7, incrementing once each clock cycle, and outputs the current count in binary representation as three bits. The aten vm0808ha 8x8 4k hdmi matrix switch supports 4k resolutions of uhd 3840 x 2160 and dci 4096 x 2160 with refresh rates of 30 hz 4. In this work we develop and test a simplified 16channel highpower butler matrix at 300 mhz. Pdf design and implementation of singlelayer 4x4 and. As a matrix switch the vm0808h allows eight hdmi source devices to cross. Design of an 8x8 crossconfiguration butler matrix with. Bialkowski school of itee, the university of queensland brisbane, australia email. In our example, almost all of the distributed element parameters for the transmission lines can be placed on a 50. Vishal bhame department of electronics and telecommunication, pune institute of computer technology, india, pune. Nov 17, 2017 microwave butler matrices left 3d orthogonal double set of 8x8 butler matrices right example of a 8x8 rf matrix. Suggested implementation of 8x8 led array to implement a matrix driver in hardware, we use a 3bit counter to control a decoder and several multiplexers.
Butler matrix for microstrip, for beam forming network. A simplified 16channel butler matrix for parallel excitation with the birdcage modes at 7t. The order of the pins is assigned in two arrays in the code. Nevertheless, conventional butler matrix design often is implemented in a 2d structure in microstrip lines with a large layout. In figure 2 the construction of a 8x8 butler matrix by using the previous described building blocks is shown as well as an example of the differential phasedelay among the output for a single input.
Microstrip technique is widely used in butler matrix due to its numerous advantages such as low profile, easy fabrication and low cost. A new compact layout topology for the 8x8 butler matrix beamforming network is presented in this work. The butler matrix 3 is such a network, as shown in fig. This backpack solves the annoyance of using 16 pins or a bunch of chips by having an i2c constantcurrent matrix controller sit neatly on the back of the pcb. A the two 8x8 butler matrices with the interface to drive them as a single 16x16 butler matrix, b 16 channel tr stripline array coil.
Unlike the conventional design, this device can be easily reconfigured into two 8x8 butler matrices. How would this influence the performance if it is deployed in. Study of a planar topology butler matrix for printed multibeam. A simple switchedbeam antenna array based on a 8x8 butler. Fortunately, such a network, better known as butlermatrix, has been introduced in 23. The performance of the networks is evaluated by measuring their frequency response. Originally, butler matrices have typically employed 90 branch line couplers. Operation at 36 ghz is achieved with a frequency bandwidth exceeding 400 mhz.
Displays rowcolumnscanning rowcolumm scanning to control an 8x8 led matrix. This matrix generates a set of n orthogonal beams from the n antenna elements of an equispaced linear array. Two potentiometers, connected to analog pins 0 and 1, control the movement of a lit led in the matrix. The most important beamforming networks used for multiple beams with lineaire array are based on the butler matrix. Design and implementation of a wideband beamforming.
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