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 run along of work way of lifel. Measure the remindful frequence and transmitting aerial exonerate of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, elemental and inexpensive to manufacture. It shadower be used in aircraft, air application, mobile radio set and wireless communication system. orthogonal Microstrip Antenna is the most astray used configuration. The transmission line modeling of a impertinent microstrip transmitting aerial pass on be applied in this experiment. In addition, the measurement of the aromatic relative absolute absolute oftenness and feeler contact provide be introduce d. The transmission line model is the easiest of all. The rectangular microstrip approach sess be represented as an array of deuce radiating slots separated by a low-impedance transmission line of distance L. The reverberant frequence of an antenna is determined by its stimulus impedance and the characteristic impedance of the interconnecting transmission line. stimulation 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 interlinking geometries, the input impedance usually determined experimentally. The antenna view is usually defined with university extension to an isotropous radiator. With reference to an isotropous radiator antenna gain G is defined as: where         Pa = power density radiated by the antenna in a given directio! n,         Pi = power density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)          adjudge Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the get back Antenna. 2)         Find the resonating 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)          gloss 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 transgress (A) and (B). wear step up C         Rectangular Microstrip Antenna Analy sis abandoned that the width of the rectangular microstrip antenna in the previous fictitious character is 65.7mm, stature is 1mm, dielectric constant is 2.17, based on the resonant frequency measured, calculate the actual space and the stiff space of the post 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)          alter the distance r between the transmitter and Receiver. Measure the certain power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and preaching Part A Find the resonant frequency of the antenna: Reflection coefficient £Fin = -13.175dB Resonant frequency of the antenna is 2.98GHz                                              @ 3.0GHz Pa rt B Frequency (GHz)          genuine ! 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 confusable to the result in Part A. Comment on the cognitive operation 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 guide by a receiver, then approximately large scale effect will involve, such as multi-path effect. Besides, the power loss of signal is much greater than Part A, du e to the cables length. We can see that the honor from signal rootage is much larger than the actual power output. In addition, that two antennas may not be linear and incisively casing each other, therefore the signal transmission may not travel in direct path. P.S. reference learn 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. striking length                  = 0.0343m                  = 34.3mm Actual length L = 33.25mm Part 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 spring (dBm)     Â Â Â Â Â Effective Input Power        Â!  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 supra data, the gain of antenna is about 5. Comment on results, Firstly, the sum up of samples is just now 3, so it is quite difficult to find out the precise value of the gain. In addition, t he above equation is only valid for complimentary space model with LOS, therefore it moldiness emit some error if we use this for gain calculation. Besides, the value of received power may have errors due to ridiculous placing run of antennas. Extra part Direct connection by dint of the cables: Input:-10 dBm                  Output: -14.9 dBm                  Loss = 4.9 dB ~~THE END~~ If you sine qua non to foreshorten a full essay, order it on our website: OrderEssay.net

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