Telecommunication technology that is widely used to communicate in the internet era today is Long Term Evolution (LTE) technology. In carrying out LTE services, the link is needed between the access network and the core or commonly known as backhaul. One of the backhaul widely used to connect a communication link is a microwave backhaul. The application of a microwave link uses extensively for the line of sight (LOS) communication. Therefore, this microwave link planning is not easy because there will be many factors that influenced the communication link, include barriers, fading, attenuation, noise, and distance. In this research, microwave link planning will be carried out between the Semarang City and the Magelang City using three scenarios. The first scenario conducted by using single-hop or direct communication, the second scenario using an active repeater, then the third scenario using the passive repeater. The last result shows that the most suitable scene to be applied in the Semarang-Magelang microwave link is the second scenario. Using active repeater, which reflecting and amplifying the Tx site signal towards the Rx site, is considered to be a solution for the link trajectory, which contained high obstacle and great distance. Using the second scenario from this research, showing that the signal power at Semarang and Magelang site is-54,67 dBm and-48,66 dBm. These signals are above both of Rx threshold site, that is-67,50 dBm.

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Filter is an RF component that has an important function in a communication system. The type of filter which is usually used in receiver system is bandpass filter (BPF). The filter design method that is discussed on this paper is square ring resonator using microstrip transmission line modified by adding coupled line stub on each side of resonator. The modification is used because it is capable to optimize the return loss and to hold the insertion loss so that the filter could be working as a wideband filter. This paper discusses the influence of the geometrical changing from stripline microstrip on BPF square ring resonator microstrip performance. The evaluation is needed to obtain the optimum performance of BPF microstrip which is suitable to communication system specification. The simulation is performed using component RF simulation software with Rogers RT/Duroid 5880 substrate which has dielectric constant (εr) of 2.2. The result of last simulation shows that the filter has center frequency around 1.5 GHz with its average bandwidth is around 916 MHz.

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