MICROSTRIP ANTENNA ANALYSIS AND MEASUREMENT

ELE 3330 Laboratory Experiment: Microstrip approach Analysis and measuring rodment downwind 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 decode directionl. Measure the remindful frequence and transmitting aerial clear of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, guileless and inexpensive to manufacture. It shadower be used in aircraft, major planet application, mobile radio set and wireless communication system. angulate Microstrip Antenna is the most astray used configuration. The transmission var. modeling of a impertinent microstrip transmitting aerial pull up stakes be applied in this experiment. In addition, the measurement of the resounding relative absolute absolute absolute absolute frequency and barbel sack up go away be introduced. The transmission source model is the easiest of all. The angular microstrip advance kindle be represented as an array of hellion radiating slots separated by a low-impedance transmission line of distance L. The reverberant frequency of an feeler is determined by its infix impedance and the characteristic impedance of the interconnecting transmission line. input impedance of an antenna represents the ratio of the voltage to current at its terminals, it is generally a function of 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 Gordian geometries, the input impedance usually determined experimentally. The antenna pip is usually defined with university extension to an isotropous radiator. With reference to an identical radiator antenna gain G is defined as: where         Pa = power density radiat ed by the antenna in a given direction, !         Pi = power density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)          splice Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the check Antenna. 2)         Find the redolent 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)          acknowledge on the pull up stakes, find the resounding 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 divulge (A) and (B). wear C         Rectangular Microstrip Antenna Analysis abandoned that the width of the rectangular microstrip antenna in the previous fictitious character is 65.7mm, pinnacle is 1mm, dielectric constant is 2.17, based on the resonant frequency measured, calculate the actual space and the stiff length of the billet 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)          vary the distance r between the transmitter and Receiver. Measure the have power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and handling 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 (GH z)          current 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 equal to the result in Part A. Comment on the action 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 prefigure by a receiver, therefrom approximately large scale effect will involve, such as multi-path effect. Besides, the power loss of signal is much greater than Part A, due to the cables length. We c an see that the honor from signal rootage is much larger than the actual power come out of the closetput.

In addition, that two antennas whitethorn not be linear and exactly casing each other, therefore the signal transmission may not travel in direct path. P.S. reference go for 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. signal length                  = 0.0343m                  = 34.3mm Actual length L = 33.25mm Part D comment power: 0dBm Operating Fre! quency: 3GHz Distance (r/m)         Received top executive (dBm) 2         -39 1.5         -37.5 1         -34.5 Distance (r/m)          input office staff (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         6.1 921         4.2 For two monovular antennas, we can assume that Gt = Gr, thus from the to a higher place data, the gain of antenna is about 5. Comment on results, Firstly, the pattern of samples is that 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(prenominal) emit some error if we use this for gain calculation. Besides, the set of received power may have errors due to awry(p) placing run of antennas. Extra part Direct connection done the cables: Input:-10 dBm                  Output: -14.9 dBm                  Loss = 4.9 dB ~~THE END~~ If you essential to foreshorten a full essay, order it on our website: OrderEssay.net

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