Dual bandpass microwave filter

A dual passband microwave filter comprising:

• input and output waveguide means;
• and
• filter means coupled to said waveguide means, said filter means including a plurality of resonating cavities disposed therein, each of said cavities resonating at first and second microwave frequencies in orthogonal TE and TM modes respectively, said waveguide means being oriented at an angle of inclination relative said filter means in order to excite said TE and TM modes, and said cavities being tunable to said first and second microwave frequencies to produce a first passband at said first microwave frequency and a second passband at said second microwave frequency.

A microwave passband filter having separate filter passbands, said filter comprising:

• input and output waveguide means for propagating a band of microwave frequencies;
• and
• filter means coupled to said input and output waveguide means, said filter means resonating at a first microwave frequency in a first electromagnetic mode and a second microwave frequency in a second electromagnetic mode, said filter passbands determined by said first and second resonant frequencies, whereby only those frequencies within said filter passbands can propagate within said output waveguide, said filter means and said waveguide means being disposed about a common longitudinal axis, and said waveguide means being oriented about said longitudinal axis at an angle of inclination with respect to said filter means, thereby producing coupling variations to said first and second microwave frequencies.