Dielectric cavity notch filter

1. A band stop filter comprising:

a circuit board having a first surface and an opposing second surface, the circuit board having a transmission line on the first surface; and

a dielectric cavity resonator physically coupled to the second surface of the circuit board, and having a coupling aperture configured to magnetically couple the dielectric cavity resonator to the transmission line, and to cause excitation of the dielectric cavity resonator in a second order transverse electric (TE) mode,

wherein the dielectric cavity resonator has a resonance frequency equal to a notch frequency of the band stop filter.

2. The band stop filter of claim 1 , wherein the coupling aperture corresponds to a loop-shaped gap on a metallized surface of the circuit board.

3. The band stop filter of claim 1 , wherein the dielectric cavity resonator comprises a metal-coated ceramic substrate.

4. The band stop filter of claim 1 , wherein the dielectric cavity resonator has a coefficient of thermal expansion (CTE) substantially equal to a CTE of the circuit board.

5. The band stop filter of claim 1 , comprising a plurality of dielectric cavity resonators physically coupled to the circuit board, each of the plurality of dielectric cavity resonators magnetically coupled to the transmission line via a respective coupling aperture.

6. The band stop filter of claim 1 , comprising a conductive layer arranged between the circuit board and the dielectric cavity resonator, the conductive layer having a coupling aperture that is aligned with the coupling aperture of the dielectric cavity resonator.

7. The band stop filter of claim 6 , wherein the coupling aperture of the conductive layer comprises a loop-shaped gap on the conductive layer.

8. The band stop filter of claim 7 , wherein the loop-shaped gap has a circular or elliptical structure.

9. The band stop filter of claim 1 , wherein the circuit board includes a single layer substrate that is at least partially coated with copper on opposing sides of the single layer substrate.

10. The band stop filter of claim 1 , wherein the coupling aperture is aligned with the transmission line and separated from the transmission line by at least a thickness of the circuit board.

11. The band stop filter of claim 1 , wherein a side of the transmission line facing away from the circuit board is coated with an insulator material.

12. The band stop filter of claim 1 , wherein the dielectric cavity resonator is configured to attenuate a signal at a frequency within a frequency range of 2 GHz to 30 GHz.

13. A method comprising:

providing a circuit board having a first surface and an opposing second surface, the circuit board having a transmission line on the first surface;

sizing a dielectric cavity resonator to have a resonance frequency equal to a notch frequency of the band stop filter; and

physically coupling the dielectric cavity resonator to the second surface of the circuit board, enabling a coupling aperture of the dielectric cavity resonator to magnetically couple the dielectric cavity resonator to the transmission line, and to cause excitation of the dielectric cavity resonator in a second order transverse electric (TE) mode.

14. The method of claim 13 , further comprising physically coupling a plurality of dielectric cavity resonators to the circuit board, enabling each of the plurality of dielectric cavity resonators to magnetically couple to the transmission line via a respective coupling aperture.

15. The method of claim 13 , further comprising providing a conductive layer between the circuit board and the dielectric cavity resonator, the conductive layer having a coupling aperture that is aligned with the coupling aperture of the dielectric cavity resonator.

16. The method of claim 15 , further comprising forming a coupling aperture on the conductive layer that comprises a loop-shaped gap on the conductive layer.

17. The method of claim 13 , further comprising forming the coupling aperture as a loop-shaped gap on a metallized surface of the dielectric cavity resonator.

18. The method of claim 13 , further comprising aligning the coupling aperture with the transmission line while separated from the transmission line by at least a thickness of the circuit board.

19. A band stop filter comprising:

a circuit board having a first surface and an opposing second surface, the circuit board having a transmission line on the first surface; and

a dielectric cavity resonator physically coupled to the second surface of the circuit board, and having a coupling aperture configured to magnetically couple the dielectric cavity resonator to the transmission line, and to cause excitation of the dielectric cavity resonator in a second order transverse electric (TE) mode,

wherein the dielectric cavity resonator has a coefficient of thermal expansion (CTE) substantially equal to a CTE of the circuit board.