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LTCC filter with adjustable center frequency and fixed absolute bandwidth and simulation method

A center frequency and filter technology, applied in the field of microwave filters, can solve the problems of reducing circuit size, less adjustable filter structure, large size, etc.

Active Publication Date: 2020-06-09
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The design of the tunable filter has been mainly focused on the planar substrate and cavity structure, which has a large size and is not suitable for circuit integration. In the volume reduction technology, the circuit is placed in the ceramic by using the low temperature co-fired ceramic process (LTCC). Inside the body, its internal circuit is stacked, which can greatly reduce the size of the circuit. However, most of the filters designed by LTCC technology are fixed, and there are few adjustable filter structures.

Method used

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  • LTCC filter with adjustable center frequency and fixed absolute bandwidth and simulation method
  • LTCC filter with adjustable center frequency and fixed absolute bandwidth and simulation method
  • LTCC filter with adjustable center frequency and fixed absolute bandwidth and simulation method

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0055] figure 1 It is the overall structure diagram. Port 5 is a frequency control port. Applying voltage to this port can change the capacitance of the varactor diode and affect the resonant frequency; port 2 is an input port, port 4 is an output port, and the port impedance is 50 ohms; 1, 3 are ground ports; the filter has 9 layers in total, the size is 4.3mm*4.3mm*1.9mm, the LTCC dielectric substrate model is Dupont951, the dielectric constant is 7.5, and the loss tangent is 0.006. All metal layers are made of silver, and the thickness between adjacent layers of the first to ninth layers is 20 μm, 50 μm, 40 μm, 20 μm, 10 μm, 10 μm, 10 μm, and 10 μm.

[0056] Figure 2 (1) is the first layer, which specifically includes eight metal pads to weld various lumped components; various lumped components include two 0402 resistors R1-R2, two 0402 capacitors C11-C6 and...

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Abstract

The invention discloses an LTCC filter with adjustable center frequency and fixed absolute bandwidth and a simulation method. The filter comprises five external ports and an internal filtering structure, wherein the five external ports are respectively an input port and an output port which are symmetrically distributed, a frequency tuning port and two grounding ports. The internal filtering structure sequentially comprises nine metal layers from bottom to top. A two-layer input coupling structure is adopted, and under the condition that the top layer is connected into a shielding layer, the input coupling strength is higher than that of a single-layer structure.

Description

Technical field [0001] The invention relates to the technical field of microwave filters, in particular to an LTCC filter with an adjustable center frequency and a fixed absolute bandwidth. Background technique [0002] Filters are the most commonly used passive components in wireless communication systems, especially band-pass filters, which only allow signals within the passband to pass, and filter out unwanted interference signals outside the band, which is important for ensuring good reception of communication equipment Meaning. The tunable filter is equivalent to a combination of multiple filters with different frequencies. For example, in a software-defined digital radio frequency system, tunable filters are used to replace large filter banks, thereby greatly saving installation costs and space; in addition, in order to improve the accuracy and efficiency of reconstructed signals, The selectivity, loss, and constant bandwidth of narrow-band filters have all put forward hi...

Claims

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Application Information

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IPC IPC(8): H03H7/12
CPCH03H7/12Y02D30/70
Inventor 高坤坤游彬
Owner HANGZHOU DIANZI UNIV
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