Transmitting Antenna is a tool which transmits signals produced by your mobile phone jammer. The main characteristic of antenna is VSWR (Voltage Standing Wave Ratio). If your antenna has VSWR of 3 or lower, then this is what you need, because the return loss of this antenna is minimal.
Jammer Store specialists use SMA antennas due to their ability of being removed or replaced easily. It is worth to mention that unidirectional antennas are preferable, unless you like to use your mobile phone jammer in a TV remote style.
Power Source makes your creation to become alive. Generally mobile phone signal jammers use 5VDC to operate. Thus you may use Lithium-ion battery to supply your creation. In the case of using common power source you will need power adapter. The power adapter may be of one of two types: switched-capacitor voltage doublers or inductor-based boost regulator.
The first one is simple and efficient yet not regulated solution, so you will need LDO regulator to fix the voltage. The second one is regulated but it has bigger cost, more complex and requires precise specification of all components to work properly.