Đồ án Design Array of Microstrip Antenna

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CONTENTS
LIST OF FIGURES 6
LIST OF TABLE 9
ACKNOWLEDGEMENT 10
ABSTRACT 11
INTRODUCTION 12
CHAPTER 1 12
MICROSTRIP ANTENNA 12
1.1 MICROSTRIP ANTENNA 13
1.1.1 The basic shape of the micro-strip antenna 14
1.1.3 The digital power supply for micro strip antennas (feed method) 17
1.1.4 Bandwidth of MSA 21
1.1.5 Principle of the radiated micro strip antennas 23
1.1.6 Radiation field of micro strip antenna 25
1.1.7 The polarized waves 30
1.2 ANALYSIS MODELS MICROSTRIP ANTENNA 31
1.2.1 Model line (Transmission Line) 32
1.2.2 Model cavity 42
CHAPTER 2 53
MICROSTRIP ANTENNA ARRAY 53
2.1 TWO ARRAY ELEMENT 55
2.2 N ELEMENT LINEAR ARRAY - MINUTES OF UNIFORM UNIFORM AND DISTANCE 58
2.2.1. Broadside array and End-Fire array 62
2.2.2 Phased Scanning Array 66
2.3 N ELEMENT LINEAR ARRAY - THREE DIMENSIONAL PROPERTIES 67
2.3.1 N elements along the z axis 68
2.3.2 N elements along the X or Y axis 68
2.4 N ELEMENT LINEAR ARRAY - UNIFORM DISTANCE, BORDER HETEROGENEITY 70
2.4.1 Coefficient array 70
2.4.2 Binomial Arrays 72
2.4.3 Schebyscheff Arrays 75
2.5 TWO DIMENSIONAL ARRAY 76
2.5.1 Coefficient array 76
2.5.2 Beamwidth 79
2.5.3 The orientation 81
2.6 CHANGE OF RADIATION PROPERTIES OF TWO-DIMENSIONAL ARRAY ANTENNA 82
2.7 INFLUENCE MUTUAL CONSTRUCT BETWEEN TWO MICROSTRIP ANTENNA 85
CHAPTER 3 88
DESIGN AND SIMULATION MICROSTRIP ANTENNA 88
3.1 DESIGN AND SIMULATION OF A MICROSTRIP PATCH ANTENNA 88
3.1.1 Design 88
3.1.2 Simulation 91
3.2 DESIGN AND SIMULATION OF MICROSTRIP PATCH ANTENNA 95
3.2.1 Design 95
3.2.2 SIMULATION OF MICROSTRIP PATCH ANTENNA ARRAY 97
REFERENCES 102
.2.2.2 Radiation School - Mode TMx010
Micro-strip antenna radiation field radiation field is the sum of two element array, with each element representing a slot. When two identical slots can be calculated by the total generation capacity of the array for two slots.
The radiation slot
If remote power radiated by each slot is based on the equivalent current density as follows:
• The distribution of the signal amplitude for the antenna element on the x and y axes. It is Am and Bm.
However, in practice, for a given array antenna system or with the characteristics required of the radiation beam to constantly changing array then changing the distance between the elements or the number of antenna elements ( collectively change the "hardware") is not feasible. When it needs a software solution for the stars to change the beam characteristics simple, flexible, fast. This can absolutely be done. The idea is as follows: if a signal before going to the antenna for radiation which is multiplied by a complex number, then the amplitude and phase of the signal will be changed. Thus, if all the signals to the antenna elements in the array are multiplied by the appropriate complex numbers, called weights, then the continuous phase and the amplitude difference between the signal will be changes according to a certain rule. This means that, when we get a weight matrix complex matrix effects on signal for the antenna array, we will change the distribution of phase and amplitude of the signal distribution for the antenna array and make radiation characteristics of the array changes.
Calculation of complex weight matrix W
Suppose we have baseband signal s (t) to be transmitted in the RF frequency ωc. First, it will be put through a splitter to create MxN cells signal components and MxN cells signal before it is sent to M × N antenna elements will be multiplied with complex weights wi (i = 1 , 2, ..., MN) appropriate to change the amplitude and phase of the signal components. 2:12 The figure below illustrates this mechanism.


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