HIGH FREQUENCY RECEIVER HAVING PRINTING TYPE INTERMEDIATE FREQUENCY FILTER

摘要

PURPOSE: A high frequency receiver having a printing type intermediate frequency filter is provided to implement an intermediate frequency filter based on a printing pattern for thereby fabricating a product at a lower cost and obtaining a compatibility. CONSTITUTION: A low noise amplifier(11) amplifies a high frequency(RF) signal to a low noise signal from an antenna(ANT). An oscillator(12) generates an oscillation frequency. A mixer(13) mixes an output signal from the low noise amplifier(11) and an oscillation frequency of the oscillator(12) and outputs an intermediate frequency signal. An intermediate frequency filter(14) implements an intermediate frequency(IF) signal from the mixer based on a printing pattern for a band pass. First, second and third inductor patterns(PL1, PL2 and PL3) are formed in a lattice pattern in a crew shape for obtaining a certain inductance corresponding to a pass frequency in a small area. The second inductor pattern(PL2) of the intermediate frequency filter(14) are formed shorter than the lengths of the first and third inductor patterns(PL1 and PL2). The first and third inductor patterns(PL1 and PL3) are symmetrically formed, and the first and third line patterns(PL1 and PL3) are formed symmetrically.