Direct integrated design method for random-bandwidth multi-pass-band generalized Chebyshev filter

A Chebyshev, comprehensive design technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve problems such as inability to apply broadband conditions, processes, and complexities

Inactive Publication Date: 2012-09-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the existing multi-passband generalized Chebyshev filter comprehensive design method that cannot be applied to broadband conditions and the process is complicated, and proposes an arbitrary bandwidth multi-passband generalized Chebyshev filter The direct synthesis design method, the synthesis design method can directly synthesize each passband

Method used

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  • Direct integrated design method for random-bandwidth multi-pass-band generalized Chebyshev filter
  • Direct integrated design method for random-bandwidth multi-pass-band generalized Chebyshev filter
  • Direct integrated design method for random-bandwidth multi-pass-band generalized Chebyshev filter

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Embodiment 1

[0053] Embodiment one: if figure 2 and image 3 As shown, the present embodiment is based on literature (Yi-Ting, and Chi-yang Chang, "Analytical design of two-mode dual-band fi lters using e-shaped resonators", IEEE Transactions on Microwave and Techniques, vol.60, No. .2, June 2012, pp.250-260.) Example 2 is a synthetic object. This example is a sixth-order dual-passband filter (that is, the number of passbands M=2), the center frequency of the first passband is at 1.79GHz, the second passband is at 2.265GHz, and the return loss RL in the passband i Both are 15dB. The low-pass prototype network matrix [M] provided in this paper is

[0054] [ M ] = - j 0.4873 0 0 0.4214 0 ...

Embodiment 2

[0071] Embodiment two: if Figure 4 As shown, the analog filter to be synthesized is a seventh-order filter with two asymmetric passbands. The two passbands are located at [2.5, 3.0] GHz and [5.0, 6.0] GHz respectively, and the return loss in the passband is set to 20dB. Obtain horizontal network matrix comprehensively by the method of the present invention for

[0072] [ A ‾ ] = - J 0.2907 0.4469 0.4155 0.2534 0.4995 0.8330 0.4478 0 0.2907 ω ‾ ...

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Abstract

The invention relates to a direct integrated design method for a random-bandwidth multi-pass-band generalized Chebyshev filter. The method comprises the following steps of: 1, according to indexes of an analog filter to be integrated, performing independent integrated design on each pass band according to single-pass-band filters, and deriving a characteristic function and a polynomial, which correspond to each single-pass-band filter; 2, substituting the characteristic functions and the polynomials into a superposition relational expression, deriving the corresponding polynomials and determining final characteristic functions of the analog filter to be integrated; 3, converting a scattering matrix which is formed by the polynomials into a theoretic admittance matrix; and 4, performing partial fraction expansion on the theoretic admittance matrix which is obtained in the step 3, and thus obtaining a transverse network matrix of the analog filter to be integrated, which is represented in a global resonant mode. The direct integrated design method for the random-bandwidth multi-pass-band generalized Chebyshev filter has the advantages that network matrixes of various topological equivalent circuits for realizing the frequency response of the analog filter to be integrated can be directly derived, and final physical implementation is facilitated.

Description

technical field [0001] The invention relates to a filter synthesis design method in the field of communication technology, in particular to a multi-passband generalized Chebyshev filter synthesis design method based on a superposition method of any bandwidth, which can be used for multi-passband generalization of any bandwidth Chebyshev filter for direct synthesis design. Background technique [0002] In recent years, many wireless communication standards or protocols have emerged, such as global system for mobile communication (GSM) (800 / 900MHz), global positioning system (GPS) (1575MHz), wideband code division multiple access (WCDMA) (2.1 GHz), Wi-Fi(802.11b / g / a, 2.4 / 5.2GHz), Bluetooth(2.4GHz), wireless local-area network(WLAN)(2.4 / 5.2GHz), and Worldwide Interoperability for Microwave Access(WiMAX) (3.5GHz) and so on. A current trend is to integrate these applications into a single system that can support the operation of multiple standards or protocols. This system can...

Claims

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Application Information

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IPC IPC(8): H01P11/00
Inventor 肖飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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