Transverse electromagnetic mode resonator

A tunable stripline resonator comprising:

• an outer ground conductor having a ground potential adhered to one surface of a dielectric substrate;
• a floating line conductor arranged apart from and in parallel with said outer ground conductor, said floating line conductor allowing a standing-wave current to flow therethrough to form one of a TEM mode and quasi-TEM mode electromagnetic field around said line conductor;
• and
• a slot line located on said outer ground conductor in close proximity and perpendicular to said line conductor, said slot line having two ends which are shorted and a capacitive element connected across the slot line, the capacitive element having a capacitance for varying the resonance frequency of the resonator.

A tunable stripline resonator having a microstrip line structure comprising:

• a dielectric substrate;
• an outer ground conductor having a ground potential adhered to a rear surface of said dielectric substrate;
• a microstrip transmission line conductor provided on an upper surface of said substrate, said microstrip line having one end electrical open and an other end shorted by a short-circuit conductor provided on one edge surface of said substrate thereby to connect said outer ground conductor with said microstrip line via said short-circuit conductor, said microstrip line conductor being arranged apart from and in parallel with said outer ground conductor, thereby allowing a standing-wave current to flow through said microstrip line conductor to form one of a TEM mode or quasi-TEM mode electromagnetic field around said line conductor;
• a slot transmission line provided on said outer ground conductor, said slot transmission line having two ends wherein each one of said two ends are shorted so as to achieve a specified variable electric line length, said slot line being located apart from said short-circuit conductor by a predetermined distance said slot line further located symmetrically and perpendicularly with respect to said microstrip line, thereby varying the resonance frequency of said tunable stripline resonator by varying the electrical line length of said slot line.