TWI236213B - Harmonic spurious eliminating filter for wireless network product - Google Patents

Abstract

The present invention provides a harmonic spurious eliminating filter for wireless network product, which employs the production technology for printed circuit board to directly layout the micro-strip circuit contained in the filter onto the circuit board when fabricating a circuit board of the wireless network product. The micro-strip circuit includes an input micro-strip circuit and an output micro-strip circuit, and one end of the input and the output micro-strip circuit are connected with one end of the first micro-strip circuit and the fourth micro-strip circuit in direct joint, and the first and the fourth circuits are crossed and alternately arranged in an interdigital finger manner. The input and the output micro-strip circuit extend with a corresponding second micro-strip circuit, and the other end of each second micro-strip circuit is crossed with a meanderingly extended third micro-strip circuit at the position corresponding to the first and the fourth micro-strip circuits, so as to form the required filter. The present invention is expected to greatly reduce the size of the filter without using additional high frequency filter, and effectively reducing the volume and manufacturing cost of the circuit board, so as to make the fabricated wireless network product slimmer, and more compact.

Description

1236213 IX. Description of the invention: [Technical field to which the invention belongs], The present invention relates to a manufacturing technology of a printed circuit board for a wave suppressor for suppressing harmonic noise, and the microstrip line is directly arranged on a benefit line. Formation-ΐ size, low cost and high efficiency filter to suppress the high frequency harmonic noise generated by this evil line network product. [Prior art]

J ^ freles ^ LM The solution area where different Wei brand wireless products can communicate with each other, and the development of Zhoulu, has opened another new definition: 2: 7 to implement a single chip solution with r device, two ^^ $ '. Allows wireless LANs to be widely used in all kinds of wireless 7 slow networks. Ϊ́?: Road / products manufacturer Yuzu Shishi Yu Yu Yiyi; ίίίί: f___ In the high-powered state, electromagnetic interference (跏 1) is conducted by qualified personnel. In order to solve this problem, each advanced country aims to correct non-compliant wireless network products and L. In order to verify this' no _ job maker's design, the manufacturer needs to consider that the relevant regulations must be taken into account when it and the J-made line _ ?, and then add a filter to suppress the problems caused by it. The high-frequency waves of the wireless network products combined with the national phase = household = can be exemplified. Please refer to the paragraph, =, -2.4 $ of _ The printed circuit board of the product is shown in the figure, in order to save the filter The occupied space is 1236213, and the low-pass filter connected to the power amplifier is generally doubled. The size is 133 x 300mil2 and the circuit is laid on the printed circuit board. The H-circuit board is made directly by microwave technology. In order to form the wave filter, the wave wave n includes-rounds, and the microstrip ends of the rounds are orthogonally connected, and the filter end is connected to a third microstrip line = outgoing microstrip line. One of 15 (_deHng), which is arranged at the micro-noise at the end of the 15th line corresponding to the 1: ^^ road which has a gently serpentine belt line. It is expected that the low-frequency harmonic wave shown in the first solid-state high-frequency harmonic wave of the purely flat-faced distortion of the professional student will be used for a /-9 ΛΓΏ wireless network product according to the wave 2. The suppression of 2. 4GHz is 27 7 7I For the double-spectrum wave 4. 8 GHz Mamma Green Rose; / 73 诎, but in this kind of low-pass filter, because the first reading band Lin z3 has a large meaning, the side printing ί road helmet method is large; Reducing the volume of printed circuit boards for fr? Line network products has always produced 1 related regulations and smaller wireless network products, which have become the grandfathers and manufacturers. Although they have overcome the scale — — become various [Summary of the Invention] In view of the shortcomings of the size of the low-pass filter used to suppress high-frequency harmonics when designing and manufacturing the aforementioned traditional wireless network products, the invention is based on the wireless network The technical experience of road products and the accumulated know-how! ^, 'Aiming at the above-mentioned shortcomings, a wireless network product of the present invention was developed and designed. Harmonic noise suppression filter, using printed circuit board manufacturing technology, in the 1236213 to make the wireless network ^ σ __ round-end microstrip line two straight, waver microstrip line, the second line 5, -Two microstrip lines, one third circuit board, 4 lines of microstrip lines, such as Bunu, the linear distortion of the amplifier is not -4: = ::; straight ==: -end system with line And the fourth microstrip line; a ί; = the line between the -end system and the strip line is interdigitated (it ° '苐 wei reward line and the fourth micro- and fourth microstrip line Position, across—in the third county view corresponding to the first extension, the post office H 2 (_ndering) status? ΊitpipiSl, and manufacturing costs, so that the best-made technicians can make changes to the shape, structure, Design principle and i-schema, detail it's understanding and understanding, and enumerate several examples, with [implementation] for technical rewards f 'mainly fine circuit board of microstrip products, The work frequency of the unsatisfactory products on the circuit board covered by a wave filter is 2. The working frequency is 2. Yang Zhi's wireless LAN products are taken as an example. When designing this filter, if a third-order π-type low-pass filter (10w pass filter) with an equal ripple (Equal ripple) of 1 dB is selected as its prototype, the figure shown in Figure 3 Equivalent circuit, the terminal resistance of input terminal 20 and output terminal 25 are 50 ohms (0hms). For the table lookup, please refer to Microstrip Filters for RF / Microwave Application, Jiqiao-Shyeng Hong and MJ Lancaster, John Wiley & Sons,

Inc., 2001 — book), we can know that gl = 〇 7199, g2 = 〇 7167, g3 = 〇 3379, g4 = 0.7199, so according to the following formula:

Cn = Cn / (R〇Wc)

Ln = (R〇Ln) / Wc ′ The equivalent capacitance and inductance of the microstrip element (Lumped element) are:

Ci ^ Ca = gi / (50 * 2π * 2. 4GHz) = 951 855 (fF)

Li = (50 * g2) / (2π * 2. 4GHz) = 2. 37622 (nH) C2 '= g3 /(50*27i*2.4GHz) = 448.142 (fF)' Distributed elements of its microstrip line The equivalent of Qiaolei Road is:

Zc = 1 / Cn

Zc = Ln

, PI zi = Z4 = l / (ZCi) = 1 / (ZC4) = l / gi = 1.3891 Z2- ZLi-g2- 0.7167 Z3-l / (ZCs) = l / g3 = 2.9595, so this low-pass filtering The impedance values of the first, second, third, and fourth micrometers Z1, Z2, Z3, and Z4 included in the device are:

Zi- Z4 = ziR〇- 69.455 (Ohms) I2- Z2R0 = 35.835 (Ohms) Z3 = Z3R0 = 147.975 (Ohms). At this time, if the first and fourth microstrip lines B and Z4 are protected, ( interdigital finger) method, staggered and arranged in a two-dimensional pattern 1236213, as shown in Figure 4 of one of the 3G of the incoming microstrip line, where the parent is connected to the microstrip line 35 and two of the wheel's outgoing end: line B of the One end is orthogonal to each other, and the fourth microstrip line of the-microstrip line is the main finger shape (interdi Zl and rhyme four microstrip line Z4) ^ 'The input microstrip line 30 and the output Hi are alternately spaced from each other Arranged on the second _! Post and know each other (meandering) ^ 对应 corresponding to the first microstrip recorder f2 line Z2, will the wireless scale product be the third microstrip line? The input of the microstrip line 30 of the wave filter is the second; 1 radio signal is fed into the output of the low-pass filter-side microstrip line 35. ^ 'The output response diagram of the low-pass filter is measured by the frequency diagram. The frequency shown ^ "〇37_, which is less than the insertion loss of the ^ th, its double spectrum spectrum 4 s lessons learned, the insertion loss diagram of the dead / considered wave state: ^ system filter 2 = == Quantity coffee, it is greater than the first △ and the first order is the microstrip line of the preferred embodiment of the second microstrip line, which is only for those skilled in the present invention who are familiar with the technology, and this is not the case. According to the other # μ ten hearts of any microstrip line 30, 35, the position of the fourth microstrip line Z4 at the input end and the output end of the 5th wheel corresponds to the first microstrip line fyi and the road. This input can be connected to other mild-striped microstrip lines of other shapes at the same time, all of which are the other ends of the microstrip lines 30 and 35.%! Microstrip line. The benefit line 4J invented the use of printed circuit board manufacturing technology, in the production of Xi line ί ^^ 戦 戦 的 = strip line Z4 with a finger-shaped mutual door on the 5th and 5th first microstrip line Zl and the fourth Micro 97 X 190 ... 2, compared with Unf, its size is only the area of the traditional filter shown in Figure 1, a large 5 1236213 reduced by approximately 63.8%, more than double the area, significantly Increase the y on the circuit board by m or step-down. And reduce the area and side of the circuit board side to make lighter, thinner and shorter wireless network products. In addition, The first microstrip line Z! And the fourth microstrip line are interdigitated and spaced apart from each other, which also effectively increases the number of the first microstrip line Zm and the fourth microstrip line Z4 3 The light-on length makes it smaller in size τ and reduces the total capacitance to effectively improve the wireless network product's suppression effect of high-frequency harmonic noise. The above description is only the best specific of the present invention. Example, but the structure of the present invention is not limited to this. Anyone who is familiar with the technology in the field of the present invention can download the 2 ^ 4GHz map of the nano-domain network products; Figure 3-Third-order architecture The equivalent circuit of the low-pass wave waver is slightly changed—better # _㈣ 成 之 —low-pass waver wave-pass filter is used to transcribe the ugly product into the [indicator of the main component symbols] Input terminal ... 2 〇Microstrip line at the input ............ Output: ...... :: 25 Microstrip line at the output ... Terminal resistance n

Equivalent inductance ............ fS ,, RL ............ L2 1236213 Equivalent capacitance First microstrip line Second microstrip line Third microstrip Fourth microstrip line

Ci, C2, C3 Zl Z2 Za Τλ

7

Claims (1)

1236213 + 'Applicable patent scope: 1. A manufacturing technology of wireless network production ratio circuit board, signal suppression filter, which uses the circuit included in the printed filter, and the circuit board of the two-metal product, will be one. The filter includes: ^^ π method is directly produced on the circuit board • One input end microstrip line, one first-first-microstrip line, and two end inputs: end-to-end connection; orthogonal connection; q round-in The other end of the microstrip line-the output microstrip line, its-end system and _ shape are staggered and spaced apart from each other; The position of the crossover line and the fourth microstrip line on the other end of the microstrip line at the input and output ends. The filter should be described in item 1 of the “Scope of Patent Application of No. 5 Patent Application No. 5” on the edge, The serpentine 矜 · line m microstrip line is divided into two: the input microstrip line and the other end of the output microstrip line. , Μ Jun Lu's wave filter described in the second paragraph of the euphemistic microstrip three micro τ line, the third microstrip line is meandering: and ίί =? Ί two microstrip lines of The other end corresponds to the position of the first micro-path and the fourth broken line.