High coupling, low loss saw filter and associated method

A surface acoustic wave (SAW) device comprising:

• a substrate including lithium niobate (LiNbO3) and configured to provide a propagation of an acoustic wave;
• one or more resonators formed by a plurality of electrodes on a surface of the substrate, wherein the plurality of electrodes have individual widths and are arranged with a plurality of different electrode periods with each of the plurality of different electrode periods being associated with a respective ratio of electrode width to electrode period;
• and
• a dielectric overcoat disposed between and over the plurality of electrodes, wherein the ratio of the electrode width to the electrode period is provided by:
• a/p=a_ref/p_ref+m*(p/p_ref−1);
• where a is the electrode width, p is the electrode period, m is a slope value between approximately 0.4 and 1.0, p_ref is value between a smallest electrode period (p_min) of the SAW device and a largest electrode period (p_max) of the SAW device, and a_ref/p_ref is a value between a_max/p_max and a_min/p_min, where a_max is a largest electrode width of the SAW device and a_min is a smallest electrode width of the SAW device.