Uche, if u want to build a jammer especially for an academic project,it has to be a useful one to your surrounding. First of all you need to gather essential info about the project. The info you need to provide and tackle during your project are things like; 1-What frequency or frequencies do you want to jamm, 2-What should be the power or range of your jamming signal, 3-What is the relevance of jamming the signal. The third point will be useful in your project write up, since you will be required to show the usefulness of you project. If you are going to build a GSM jammer then you will have to do some research work on GSM 900 and GSM 1800 frequency bands. Try and meet any mobile phone operator technicians for your country's mobile frequency bands. Note that you will have to work(study a little bit) on RF transmission because the above frequency bands are in MHz. The next thing will be the characteristics of your jammer; is it a constantly running jammer or a detect then block jammer. The second type is more complicated but less wave polluting than the first since it embeds a mobile bug which on detection activates the jammer proper. Since you seem to be new in the field, the free running type will be the best. The block of the system is the power supply, the IF-Intermediate Frequency section, and the RF-Radio frequency section. Start from somewhere with this piece of info and update us so we can know where you have difficulties and help, it's much more better than just giving you some schematics, and you hunting for components and design caculations.