Novel Rectangular Coupled Line Bandpass Filter

This paper reports a novel band pass filter without any periodic response. The novel filter has been named Rectangular Parallel Coupled Line filter (RPCL) and derived from reforming the conventional parallel coupled line filters. The novel band-pass filter has narrowband response. RPCL filter with center frequency of 475 MHz, 1 dB pass-band of 10MHz and 25 dB stop-band of 50MHz has been reported here. The area which has been occupied by this RPCL filter is approximately about 52 cm. The RPCL can be tuned for various applications at desired center frequency and bandwidth. The occupied area by the filter reduced related to the center frequency of RPCL. High power transmission capability is another distinguished feature of the RPCL filter. Furthermore, at high frequency applications the filter can be designed due to use in high power MMIC packages. The periodic frequency responses related to approximately all types of Microstrip passive filters has been suppressed in the novel RPCL filter. The novel RPCL filter can be designed for dual band applications such as 3G/GSM in a 3 cm MMIC package.