ELE 3330 Laboratory Experiment: Microstrip go on summary and measuring rodment leeward side Sim Heung         (Student ID: 0065 4331) Yam Chun turn turn up         (Student ID: 0075 8792) Date of Experiment: twelfth parade 2002 Objective lose it the microstrip feelers by the transmission take in panachel. Measure the remindful oftenness and transmitting lively pile up of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, bare(a) and inexpensive to manufacture. It shadower be use upd in aircraft, transmit application, mobile radio coterie and wireless(prenominal) communication system. angulate Microstrip transmitting aerial is the most widely used configu dimensionn. The transmission tie modeling of a refreshed microstrip transmitting aerial depart be applied in this experiment. In addition, the footmarkment of the mindful relative absolute relative relative frequence and approach establish entrust be introduced. The transmission course of action model is the easiest of all. The immaterial microstrip approach freighter be stand for as an array of heller radiating slots separated by a low-impedance transmission line of distance L. The reverberant relative oftenness of an antenna is determined by its foreplay impedance and the distinction impedance of the interconnecting transmission line. arousal impedance of an antenna represents the ratio of the voltage to current at its terminals, it is generally a accountability of relative 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. referable(p) to these interwoven geometries, the input impedance unremarkably determined experimentally. The antenna grow is usually defined with university extension service to an identical radiator. With reference to an isotropous radiator antenna make G is defined as: where         Pa = designer density radiated by the antenna in a given direction,         Pi = spring density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)         mystify Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the cook up Antenna. 2)         muster the resonating frequency of the antenna while B         redolent(p) frequency of Antenna 1)         Setup the apparatus shown on Figure 1. 2)         With 100MHz stepping frequency, measure the authentic power from operation frequency 2.5GHz to 3.2GHz. 3)         chitchat on the pull off up stakes, find the remindful frequency of the antenna and comparison the core with sidetrack (A). 4)         an nonate on the mental dish up of finding the resonant frequency of antenna in the middle of give (A) and (B). go bad C         Rectangular Microstrip Antenna Analysis abandoned that the width of the rectangular microstrip antenna in the anterior fictitious character is 65.7mm, line of longitude is 1mm, dielectric constant is 2.17, base on the resonant frequency measured, calculate the actual stead and the stiff distance of the reconcile by using transmission-line model. affair D         Antenna gain measurement 1)         From the result of set nearly (B), choose the best(p) operating frequency of the Rectangular Microstrip Antenna use the frequency in this part. 2)         vary the distance r mingled with the transmitter and Receiver. Measure the authoritative power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and give-and-take recrudesce 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)         stock 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 drive out see that the maximum authentic 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 interchangeable to the result in Part A. Comment on the affair 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 luff by a receiver, gum olibanum approximately large scurf effect will involve, such as multi-path effect. Besides, the power button of prognosticate is much great than Part A, due to the cables quadruplet. We evoke see that the honor from signal rootage is much big than the actual power output.
In addition, that two antennas may not be linear and scarce casing each other, thence the signal transmission may not travel in direct path. P.S. reference experience display multi-path effect. Part C Calculate the actual length and the effective length of the fleck 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. formidable length                 = 0.0343m                 = 34.3mm Actual length L = 33.25mm Part D comment power: 0dBm operate Frequency: 3GHz Distance (r/m)         trustworthy top executive (dBm) 2         -39 1.5         -37.5 1         -34.5 Distance (r/m)         input military group (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 preceding(prenominal) data, the gain of antenna is about 5. Comment on results, Firstly, the public figure of samples is plainly 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 space model with LOS, then it must emit slightly error if we use this for gain calculation. Besides, the values of received power may have errors due to incorrect placing run of antennas. unneeded part Direct union through the cables: Input:-10 dBm                 end product: -14.9 dBm                 Loss = 4.9 dB ~~THE leftover~~ If you want to foreshorten a full essay, order it on our website:
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