Filter module with widened passband
Filter modules having a wider passband are provided herein. In certain embodiments, the filter module comprises an input node; an output node; a filter disposed along a signal path extending from the input node to the output node; a strip line configured to generate an inductance between the filter and a ground such to increase a bandwidth of a passband of the filter module, the single strip line disposed on multiple layers, each of the multiple layers defined by a plurality of pulse-shaped) portions of the strip line disposed on a plane.
1. A filter module comprising:
an input node;
an output node;
a filter disposed along a signal path extending from the input node to the output node;
a single strip line configured to generate an inductance between the filter and a ground such to increase a bandwidth of a passband of the filter module, the strip line disposed on multiple layers, each of the multiple layers defined by a plurality of pulse-shaped portions of the strip line disposed on a plane.
2. The filter module of claim 1 wherein one end of the strip line is connected to a first ground node and the other end of the strip line is connected to a second ground node, the first ground node and the second ground node having a voltage value of the ground.
3. The filter module of claim 1 wherein the strip line includes at least one connecting portion connecting one layer of the strip line with an adjacent layer of the strip line.
4. The filter module of claim 1 wherein the strip line is arranged such that at least a part of an outer boundary of the plurality of pulse-shaped portions is disposed in the vicinity of a frame of the filter module.
5. The filter module of claim 1 wherein each of the plurality of pulse-shaped portions of the strip line has a rectangular pulse shape.
6. The filter module of claim 1 wherein each of the plurality of pulse-shaped portions of the strip line has a curved pulse shape.
7. The filter module of claim 1 wherein the filter includes at least one series resonator and at least one shunt resonator disposed between the at least one series resonator and the ground.
8. The filter module of claim 7 wherein the inductance generated by the strip line is configured to increase difference between a resonance frequency and an anti-resonant frequency of the at least one series resonator or shunt resonator.
9. A radio frequency module comprising:
a packaging board configured to receive a plurality of components;
a filter assembly implemented on the packaging board, the filter assembly including: an input node; an output node; a filter disposed along a signal path extending from the input node to the output node; a single strip line configured to generate an inductance between the filter and a ground such to increase a bandwidth of a passband of the filter module, the strip line disposed on multiple layers, each of the multiple layers defined by a plurality of pulse-shaped portions of the strip line disposed on a plane.
10. The radio frequency module of claim 9 wherein the radio frequency module is a front-end module.
11. The radio frequency module of claim 9 wherein one end of the strip line is connected to a first ground node and the other end of the strip line is connected to a second ground node, the first ground node and the second ground node having a voltage value of the ground.
12. The radio frequency module of claim 9 wherein the strip line includes at least one connecting portion connecting one layer of the strip line with adjacent layer of the strip line.
13. The radio frequency module of claim 9 wherein the strip line is arranged such that at least a part of an outer boundary of the plurality of pulse-shaped portions is disposed in the vicinity of a frame of the filter module.
14. The radio frequency module of claim 9 wherein each of the plurality of pulse-shaped portions of the strip line has a rectangular pulse shape.
15. The radio frequency module of claim 9 wherein each of the plurality of pulse-shaped portions of the strip line has a curved pulse shape.
16. The radio frequency module of claim 9 wherein the filter includes at least one series resonator and at least one shunt resonator disposed between the at least one series resonator and the ground.
17. The radio frequency module of claim 16 wherein the inductance generated by the strip line is configured to increase difference between a resonance frequency and an anti-resonant frequency of the at least one series resonator or shunt resonator.
18. A mobile device comprising:
an antenna configured to receive a radio frequency signal; and
a front end system configured to communicate with the antenna, the front end system including a filter module including: an input node; an output node; a filter disposed along a signal path extending from the input node to the output node; a strip line configured to generate an inductance between the filter and a ground such to increase a bandwidth of a passband of the filter module, the single strip line disposed on multiple layers, each of the multiple layers defined by a plurality of pulse-shaped portions of the strip line disposed on a plane.
19. The mobile device of claim 18 wherein one end of the strip line is connected to a first ground node and the other end of the strip line is connected to a second ground node, the first ground node and the second ground node having a voltage value of the ground.
20. The mobile device of claim 18 wherein the strip line includes at least one connecting portion connecting one layer of the strip line with adjacent layer of the strip line.
21. The mobile device of claim 18 wherein the strip line is arranged such that at least a part of an outer boundary of the plurality of pulse-shaped portions is disposed in the vicinity of a frame of the filter module.
22. The mobile device of claim 18 wherein each of the plurality of pulse-shaped portions of the strip line has a rectangular pulse shape.
23. The mobile device of claim 18 wherein each of the plurality of pulse-shaped portions of the strip line has a curved pulse shape.
24. The mobile device of claim 18 wherein the filter includes at least one series resonator and at least one shunt resonator disposed between the at least one series resonator and the ground.
25. The mobile device of claim 24 wherein the inductance generated by the strip line is configured to increase difference between a resonance frequency and an anti-resonant frequency of the at least one series resonator or shunt resonator.