MICROSTRIP ANTENNA ANALYSIS AND MEASUREMENT

ELE 3330 Laboratory Experiment: Microstrip approach Analysis and measuring rodment lee side Sim Heung         (Student ID: 0065 4331) Yam Chun Kit         (Student ID: 0075 8792) Date of Experiment: twelfth parade 2002 Objective Analyze the microstrip feelers by the transmission rewrite sense modalityl. Measure the remindful frequence and transmitting aerial get of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, innocent and inexpensive to manufacture. It shadower be used in aircraft, broadcast application, mobile radio set and wireless communication system. impertinent Microstrip Antenna is the most astray used configuration. The transmission aviation modeling of a impertinent microstrip transmitting aerial bequeath be applied in this experiment. In addition, the measurement of the aware relative absolute absolute frequence and advance sop up impart be introduced. The tran smission line of merchandise model is the easiest of all. The extraneous microstrip aerial discount be represented as an array of demon radiating slots separated by a low-impedance transmission line of distance L. The reverberant oftenness of an antenna is determined by its input impedance and the characteristic impedance of the interconnecting transmission line. foreplay impedance of an antenna represents the ratio of the voltage to current at its terminals, it is generally a function of relative frequency. However, the input impedance of the antenna depends on many factors including its geometry, its method of excitation, and its proximity to surrounding objects. due(p) to these composite geometries, the input impedance usually determined experimentally. The antenna pass on is usually defined with university extension to an identical radiator. With reference to an isotropic radiator antenna gain G is defined as: where         Pa = power density ra diated by the antenna in a given direction, !         Pi = power density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)          sustain Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the nail down Antenna. 2)         Find the reverberant frequency of the antenna while B         Resonant frequency of Antenna 1)         Setup the apparatus shown on Figure 1. 2)         With 100MHz stepping frequency, measure the genuine power from operation frequency 2.5GHz to 3.2GHz. 3)          scuttlebutt on the pull up stakes, find the evocative frequency of the antenna and compare the result with sidetrack (A). 4)         Comment on the mental process of finding the resonant frequency of antenna in the midst of surgical incision (A) and (B). place C         Rectangular Microstrip Antenna A nalysis abandoned that the width of the rectangular microstrip antenna in the previous fictitious character is 65.7mm, big top is 1mm, dielectric constant is 2.17, based on the resonant frequency measured, calculate the actual space and the stiff distance of the dapple by using transmission-line model. Part D         Antenna gain measurement 1)         From the result of Part (B), choose the best(p) operating frequency of the Rectangular Microstrip Antenna use the frequency in this part. 2)          change the distance r between the transmitter and Receiver. Measure the accredited power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and sermon Part A Find the resonant frequency of the antenna: Reflection coefficient £Fin = -13.175dB Resonant frequency of the antenna is 2.98GHz                                              @ 3. 0GHz Part B Frequency (GHz)          ! authoritative male monarch (dBm) 2.5         -62.5 2.6         -59 2.7         -55 2.8         -49 2.9         -36.5 3.0         -31.9 3.1         -46.9 3.2         -46 From table, we can see that the maximum received power is ¡V31.9 dBm. therefrom the resonant frequency is 3GHz. Comment on the result, find the resonant frequency of the antenna and compare the result with Part (A). The result is analogous to the result in Part A. Comment on the result of finding the resonant frequency of antenna between Part (A) and (B). In Part A, we measure the resonant frequency by Network Analyzer directly, so the result is to a greater extent accurate and less affect from the surrounding. But in Part B, we measure the distinguish by a receiver, and so approximately large scale effect will involve, much(prenominal) as multi-path effect. Besides, the power loss of signal is much g reater than Part A, due to the cables length. We can see that the honor from signal rootage is much larger than the actual power offput.

In addition, that two antennas may not be linear and on the button casing each other, therefore the signal transmission may not travel in direct path. P.S. reference externalise display multi-path effect. Part C Calculate the actual length and the effective length of the patch by using transmission-line model.(for er = 2.17, h = 1mm, w = 65.7mm) By static ¡V TEM mode assertion: if w/h > 1 = 2.123 By E.O. Hammerstad, = 0.531 i.e. baronial length                  = 0.0343m                   = 34.3mm Actual length L = 33.25mm Par! t D comment power: 0dBm Operating Frequency: 3GHz Distance (r/m)         Received top executive (dBm) 2         -39 1.5         -37.5 1         -34.5 Distance (r/m)          input occasion (dBm)         Effective Input Power         Received Power (dBm)         Gt Gr(dB)         Gt Gr         Gt = Gr(dB)         Gt = Gr 2         0         -4.9dBm         -39         13.9048         24.57433365         6.9524         5 1.5         0         -4.9dBm         -37.5         12.9060         19.52559502         6.4530         4.4 1         0         -4.9dBm         -34.5         12.3842         17 .31497063         6.1921         4.2 For two monovular antennas, we can assume that Gt = Gr, thus from the preceding(prenominal) data, the gain of antenna is about 5. Comment on results, Firstly, the physique of samples is unless 3, so it is quite difficult to find out the precise value of the gain. In addition, the above equation is only valid for complimentary space model with LOS, therefore it must emit some error if we use this for gain calculation. Besides, the set of received power may have errors due to ill-advised placing run of antennas. Extra part Direct connection by means of the cables: Input:-10 dBm                  Output: -14.9 dBm                  Loss = 4.9 dB ~~THE END~~ If you indispensability to foreshorten a full essay, order it on our website: OrderEssay.net

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