H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/63
H01P 1/20 (2006.01) H01P 7/00 (2006.01) H03H 7/09 (2006.01) H04B 1/16 (2006.01)
Patent
CA 2019073
20104-8640 ABSTRACT A radio receiver includes a filter having one or more filter sections. Each filter section has a shield provided with several helical resonators. Each helical resonator has a quarter-wavelength transmission line wound in the form of a helix with the transmission lines adjacent resonators being wound in opposite directions and being grounded at opposite ends, whereby the frequency response of the filter section has a transmission notch on the high frequency side of the filter section passband. At least one grounded shielding pin is disposed between adjacent helical resonators at such locations whereby the transmission notch in the frequency response of the filter section is steered to be coincident with or near to the image frequency. By using such a filter section as distinct from one using conventional helical resonators a transmission notch is generated on the high frequency side of the passband and by steering the transmission notch in the frequency response to be coincident with or near to the image frequency, extra image frequency rejection is gained. As a consequence a reduced number of helical resonators may be utilised to obtain the required image frequency rejection than if conventional helical resonators were used. Moreover the use of shielding pins avoids the costs that are associated with the use of partitions in conventional helical resonators.
Fetherstonhaugh & Co.
Hales Jeff
N.v. Philips Gloeilampenfabrieken
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