A novel GHz-band low-loss wide bandwidth microwave microstrip, surface acoustic wave (SAW) filter used for the spread spectrum communication system has been designed and fabricated. The 16-µm-input/output-interdigital-transducer (IDT) LiNbO3 61.00-MHz-SAW filter with microwave square open-loop resonators has an insertion loss of 3.987 dB. This device is also a 1 GHz microwave microstrip SAW filter with four coupled microstrip square open-loop resonators and two planar interdigital capacitors with S21 and S11, having bandwidths of -2.962 dB and -25.497 dB, respectively, and 800 MHz. It is speculated that the characteristics of these low-loss wide bandwidth (BW=80%) microstrip SAW filters are influenced by the interaction between electromagnetic wave and piezoelectric SAW. To confirm this speculation, devices with the same design have been fabricated on 128°-rotated YX-cut LiNbO3,GaAs S-I and 9000 Å SiO2/Si substrates. Significant variations of performance are observed among these devices.