Microwave Filter Element Removal for Low-Loss Compact Circuits

The patent extracts and removes insignificant circuit elements (such as series capacitors with very small capacitance values or series inductors with very large inductance values) from the filter design. By identifying elements that have become negligible during optimization and removing them, the design achieves lower insertion loss without requiring oversized resonators, thus resolving the contradiction between energy loss reduction and size increase.

The patent transforms resonant circuit elements into static capacitances by changing the design parameters during optimization. When a resonant element's resonant frequency moves far from the operating band or its contribution becomes negligible, it is transformed into a simple static capacitor. This parameter change eliminates the need for complex resonator structures while maintaining low insertion loss performance.

The patent systematically identifies and extracts insignificant circuit elements from the filter design during the optimization process. By removing elements that have become negligible (such as capacitors with capacitance values approaching zero or inductors with inductance values approaching infinity), the design achieves improved frequency response with fewer circuit elements, directly resolving the contradiction between reliability improvement and complexity reduction.

The patent discards insignificant circuit elements that no longer contribute meaningfully to filter performance after optimization. By identifying elements whose values have become negligible during the design process and removing them, the patent recovers design simplicity and reduces component count while maintaining or improving frequency response characteristics.

The patent removes insignificant circuit elements that would otherwise increase filter footprint and cost. By identifying elements with negligible impact on performance (such as very small capacitors or very large inductors) and eliminating them, the design achieves steep rejection slopes through optimized remaining elements rather than through sheer component proliferation, thus resolving the contradiction between out-of-band rejection improvement and footprint increase.

The patent transforms resonant elements into static capacitances when their resonant characteristics are no longer needed for achieving rejection slopes. This parameter transformation allows the filter to achieve steep out-of-band rejection through the interaction of remaining significant elements rather than requiring additional circuit elements, thereby reducing filter footprint while maintaining rejection performance.