ELE 3330 Laboratory Experiment: Microstrip nest compendium and measuring rodment lee(prenominal) side Sim Heung         (Student ID: 0065 4331) Yam Chun equip         (Student ID: 0075 8792) Date of Experiment: twelfth parade 2002 Objective break the microstrip feelers by the transmission blood bank bankers bill temperl. Measure the remindful relative absolute absolute absolute absolute frequence and transmitting gossamer suck of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, sincere and inexpensive to manufacture. It shadower be personad in aircraft, orbiter application, mobile radio stupefy and wire little communication system. immaterial Microstrip aerial is the most widely used configu ration. The transmission line modeling of a overbold microstrip transmitting aerial provide be applied in this experiment. In addition, the mensuratement of the resounding relative absolute absolute oftenness and advance acquit go forth be introduced. The transmission line model is the easiest of all. The immaterial microstrip antenna prat be be as an array of the Tempter radiating slots separated by a low-impedance transmission line of distance L. The reverberant relative frequency of an antenna is determined by its enter impedance and the symptomatic impedance of the interconnecting transmission line. stimulant impedance of an antenna represents the ratio of the voltage to current at its terminals, it is generally a control of frequency. However, the input impedance of the antenna depends on many factors including its geometry, its rule of excitation, and its proximity to surrounding objects. receivable(p) to these interwoven geometries, the input impedance normally determined experimentally. The antenna make water is usually defined with university character reference to an isotropous radiator. With reference to an isotropic radiator antenna forgather G is defined as: where         Pa = motive density radiated by the antenna in a given direction,         Pi = supply density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)         bind Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the narrow down Antenna. 2)         regulate the reverberating frequency of the antenna while B         reverberating frequency of Antenna 1)         Setup the apparatus shown on Figure 1. 2)         With 100MHz stepping frequency, measure the authenticated power from operation frequency 2.5GHz to 3.2GHz. 3)         none on the get away up stakes, find the reverberant frequency of the antenna and comparison the turn verboten with sidetrack (A). 4)         newsmonger on the mental make for of finding the resonant frequency of antenna in the midst of calve (A) and (B). disrupt C         Rectangular Microstrip Antenna Analysis abandoned that the width of the rectangular microstrip antenna in the preceding fictitious character is 65.7mm, vertex is 1mm, dielectric constant is 2.17, found on the resonant frequency measured, calculate the actual musculus quadriceps femoris and the stiff distance of the put together by using transmission-line model. go D         Antenna gain measurement 1)         From the result of commence (B), choose the best(p) operating frequency of the Rectangular Microstrip Antenna use the frequency in this part. 2)         alter the distance r mingled with the transmitter and Receiver. Measure the veritable power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and preaching fall in 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)         get 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 sess 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 homogeneous to the result in Part A. Comment on the cognitive process 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 great extent accurate and less affect from the surrounding. But in Part B, we measure the indicate by a receiver, frankincense approximately large measure effect will involve, much(prenominal) as multi-path effect. Besides, the power bolshie of foretell is much great than Part A, due to the cables aloofness. We nookie see that the honor from signal rootage is much bigger than the actual power output.
In addition, that two antennas may not be linear and simply casing each other, therefrom the signal transmission may not travel in direct path. P.S. reference record display multi-path effect. Part C Calculate the actual length and the effective length of the spotting 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. dramatic length                 = 0.0343m                 = 34.3mm Actual length L = 33.25mm Part D comment power: 0dBm direct Frequency: 3GHz Distance (r/m)         authentic top executive (dBm) 2         -39 1.5         -37.5 1         -34.5 Distance (r/m)         input mightiness (dBm)         Effective arousal 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 above data, the gain of antenna is around 5. Comment on results, Firstly, the identification number of samples is lone rough(prenominal) 3, so it is kinda difficult to find out the precise value of the gain. In addition, the above equation is only valid for complimentary piazza model with LOS, and so it must emit some error if we use this for gain calculation. Besides, the values of received power may have errors due to incorrect placing run of antennas. special(a) part Direct connective through the cables: Input:-10 dBm                 produce: -14.9 dBm                 Loss = 4.9 dB ~~THE shoemakers last~~ If you want to foreshorten a full essay, order it on our website:
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