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Dual-mode LTCC band-pass filter with wide upper stop band and nonorthogonal feedback

A band-pass filter, non-orthogonal technology, applied in waveguide devices, electrical components, circuits, etc., can solve problems such as layout difficulties

Inactive Publication Date: 2017-07-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Additionally, most dual-mode filters use quadrature-feedback input / output (I / O) ports to excite two degenerate modes, which can make layout difficult when interfacing with other components

Method used

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  • Dual-mode LTCC band-pass filter with wide upper stop band and nonorthogonal feedback
  • Dual-mode LTCC band-pass filter with wide upper stop band and nonorthogonal feedback
  • Dual-mode LTCC band-pass filter with wide upper stop band and nonorthogonal feedback

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Embodiment Construction

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] The present invention proposes a dual-mode bandpass filter with wide upper stopband and non-orthogonal feedback, which is implemented in a 2-layer low-temperature co-fired ceramic (LTCC) substrate and uses a broadside with stepped impedance Couple the lines in parallel to achieve a wide upper stopband. The second harmonic (2f o )40dB rejection and for frequency 2.4f o 20dB rejection is achieved. In order to enhance the capacitive coupling to achieve a relative bandwidth of 11%, the square ring resonator is composed of two layers of wideside parallel coupled lines. The double-layer structure not only enables high coupling capacitance, but also reduces size by using vertical broadside coupled lines instead of planar edge coupled lines. The wide upper stopband is achieved by stepped impedance microstrip lines next to the I / O ...

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Abstract

The invention discloses a dual-mode LTCC band-pass filter with a wide upper stop band and nonorthogonal feedback. Metal is distributed on parts where a top LTCC substrate and a bottom LTCC substrate are contacted with air in a microstrip line manner, two layers of substrates are connected through metal strip lines, the microstrip lines are step-shaped next to two I / O ports, broadside parallel coupling lines with wide upper stop bands are formed, and two layers of broadside parallel coupling lines form a square loop resonator. The dual-mode band-pass filter with the wide upper stop band and the nonorthogonal feedback is characterized in that the microstrip lines in the vertical direction and the strip lines in the horizontal direction have the same length L. According to the invention, broadside parallel coupling lines with step-type impedance are employed to achieve wide upper stop bands, suppression to second harmonics (2fo)40dB and is achieved, and suppression to frequency 2.4fo reaches 20dB.

Description

technical field [0001] The invention belongs to the technical field of basic electrical components, and relates to a dual-mode LTCC band-pass filter with a wide upper stop band and non-orthogonal feedback. Background technique [0002] Band-pass filters (BPF, Band-Pass Filter) with compact size, efficient out-of-band spurious suppression and good pass-band performance are widely required in modern communication systems (such as radar, satellite and mobile applications). Since the number of resonators of the filter is reduced by half, a dual-mode band-pass filter proposed in recent years has attracted much attention, and the dual-mode band-pass filter is further reduced in size compared with the single-mode filter. [0003] However, using a dual-mode bandpass filter with a resonator of one wavelength or a half wavelength at frequency 2f o ,3f o ,4f o has a parasitic passband at which f o is the center frequency of the dual-mode bandpass filter, and modern sensitive receiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 欧阳秋生颜立炜周波
Owner NANJING UNIV OF POSTS & TELECOMM
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