Nowadays, microstrip filters are widely used in microwave circuits. However, a microstrip filter requires large circuit sizes for good performance. A general microstrip filter has the disadvantage of maintaining the original circuit size to obtain better performance. In this paper, a spurline is added to a microstrip filter to improve the performance of the filter. A meander spurline is also implemented in a microstrip filter to compare the performance between different types of microstrip filters. A few designs for microstrip bandstop filters (BSF) are created and analyzed. The proposed microstrip BSFs include a spurline filter, meander spurline filter, and no spurline filter. The results show that the microstrip BSF with a spurline performs better than the other filter designs. This proposed filter has a small circuit size of 167.80 mm3 with a wide stopband bandwidth of 2.92 GHz, stopband frequency 6.05GHz at an attenuation loss of -60.2 dB, and relative bandwidth of 48.3%. This filter successfully miniaturized the circuit size by a maximum of 71.6% and improved the bandstop bandwidth by 71.8% and stopband frequency by 142.0% compared to designs from other authors. The size reduction successfully achieved in this study lowers the cost and makes the filter more compact and easy to attach to other equipment in a communication system. Measurements also show a bandwidth for the microstrip bandstop filter of 3.01 GHz, which demonstrates high-quality performance for a small filter