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US 5,313,662 AGranted
Split-ring resonator bandpass filter with adjustable zero
AssigneeMotorola, Inc.
InventorsLeng H. Ooi, Peter J. Yeh, Branko Avanic
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Abstract
A bandpass filter, having an input port and an output port, comprises a first microstrip split-ring resonator coupled to input port, and a second microstrip split-ring resonator coupled to the first microstrip split-ring resonator, and coupled to the output port. A lumped or distributed capacitance is disposed between the first microstrip split-ring resonator and the second microstrip split-ring resonator.
Claims5
A bandpass filter, having an input port and an output port, and having at least one transmission zero and a center frequency, the bandpass filter comprising:
- a first microstrip split-ring resonator coupled to the input port;
- a second microstrip split-ring resonator coupled to the first microstrip split-ring resonator, and coupled to the output port;
- and
- a lumped capacitor coupled between the first microstrip split-ring resonator and the second microstrip split-ring resonator for moving the transmission zero closer to the center frequency while maintaining the center frequency.
1 more element
A communication device comprising:
- receiver means for receiving a modulated signal;
- detector means for demodulating the modulated signal, to produce a demodulated signal;
- presenting means for presenting the demodulated signal to a user of the communication device;
- and
- the receiver means comprising a bandpass filter, having an input port and an output port, and having at least one transmission zero and a center frequency, the bandpass filter comprising:
- a first microstrip split-ring resonator located on a substrate and coupled to the input port;
- a second microstrip split-ring resonator located on the substrate coupled to the first microstrip split-ring resonator, and coupled to the output port;
- and
- a capacitor coupled between the first microstrip split-ring resonator and the second microstrip split-ring resonator for moving the transmission zero closer to the center frequency while maintaining the center frequency.
6 more elements
Dependencies are inferred from the claim text.