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The Novel Compact C-band Hairpin Bandpass Film Filter
Keywords: C-band , Hairpin, Ceramics
This letter presents a Compact C-band Hairpin Bandpass Film filter which can be soldered on the PCB board .The proposed filter which is fabricated on an Al2O3 ceramic substrate has a more well performance than the first filter fabricated on a commercial substrate (Rogers R04350) which is designed in the PCB board . The pads in the bottom of the filter which are connected to the input and output ports using the vertical vias are compact in size. The resistance pass through the holes is less than 100 milliohms. The method is verified by circuit and EM simulations. The C-band Hairpin Bandpass Film Filter of this paper, which is soldered to the PCB board could reduce the impact of spurious signals on the LO signal in the transceiver. The frequency source is an important part of the transceiver, which provides local oscillator signal to the transceiver channels. The spurious signals of transceiver system are required less than 60dBc. The experimental filter of this paper is fabricated on a Al2O3 ceramic substrate with a relative dielectric constant of 9.8, thickness of 0.381mm and PCB board is fabricated on a commercial substrate (Rogers R04350) with a relative dielectric constant of 3.66, and loss tangent of 0.004 more than Al2O3 ceramic. The first filter is designed in the PCB board with thickness of 0.381mm. The proposed filter of this paper has a more well performance than the first filter. First, The precision of processing of the first filter designed in the PCB board which is worst than Al2O3 ceramic substrate, and the loss tangent of Rogers R04350 is bigger than Al2O3 ceramic. Second, Because the design of frequency source is complex and PCB board is multilayer, the bottom of the original filter unpaved lot of ground and only around the filter is grounded, so the ground is not very good, and performance is less than the indicator of the design. At last , the first filter with a substrate size of 8.1mm by 7.4mm is 5th-order hairpin filter and the proposed filter of this paper with a substrate size of 7mm by 7mm is 7th-order for the dielectric constant of PCB is less than Al2O3 ceramic. The size of proposed filters is relatively small than the first filter because of the dielectric constant, and consistency of the characteristics in the high and low temperature characteristics are also very good because of the advanced technology of the film. In this paper, it studies a novel compact C-band hairpin bandpass film filter using in the transceiver which can be soldered on the PCB board. The difficulty of the accomplish filter design includes two aspects, the first aspect is to establish an accurate model as seen from Fig.4, the second aspect is keep the impedance of the metal holes which connected to the metallization of pads and input and output ports small enough. By means of the Full-wave simulated simulation software, it simulates 7th-order C-band hairpin bandpass filter, and uses the Al2O3 ceramic substrate with thickness of 0.381mm to make the filter. The test results as Fig.8 show that the insertion loss and out of band rejection meet the design and usage requirements. The method of the novel compact C-band hairpin bandpass film filter can be widely used in various microwave system.
Yang Xuan,
East China Research Institute of Microelectronics
230022, Anhui
China


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