A common-mode feeding wide stopband filter based on multilayer LCP technology

Abstract

The present application discloses a common-mode fed wide-stopband filter based on multi-layer LCP packaging technology, including a top-layer T-junction microstrip feeder, an upper-layer square patch resonator, an intermediate-layer metal ground plane, a lower-layer square patch resonator, and a bottom-layer T-junction microstrip feeder arranged in sequence from top to bottom, the top-layer T-junction microstrip feeder and the upper-layer square patch resonator are connected through a first metal through hole and a second metal through hole, and the bottom-layer T-junction microstrip feeder and the lower-layer square patch resonator are connected through a third metal through hole and a fourth metal through hole. The present application achieves the purpose of suppressing high-order harmonics by feeding the input signal in common mode at an appropriate position to avoid the excitation of high-order modes, thereby achieving the purpose of suppressing high-order harmonics without introducing any additional components.

Description

Technical Field

[0001] The present application relates to the field of microwave passive devices, and in particular to a common-mode feeding wide-stopband filter based on multi-layer LCP technology. Background Art

[0002] With the booming development of modern wireless communication technology, patch resonators have been widely studied due to their high power handling capability and low insertion loss. Since the two traditional design methods will produce a large number of high-order harmonics, high-order modes can usually be suppressed by introducing low-pass components, but this will increase the overall size of the circuit. Here, a common-mode feeding method is proposed, and by reasonably arranging the positions of metal through holes, a filter with high performance and wide stopband is designed without introducing any additional components. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a common-mode feeding wide stopband filter based on multilayer LCP technology, which can design a filter with high performance and wide stopband without introducing any additional components.

[0004] According to the first aspect of the embodiment of the present application, a common-mode feeding wide-stopband filter based on multilayer LCP technology is proposed, including a top-layer T-junction microstrip feeder, an upper-layer square patch resonator, a middle-layer metal ground plate, a lower-layer square patch resonator and a bottom-layer T-junction microstrip feeder arranged in sequence from top to bottom, the top-layer T-junction microstrip feeder and the upper-layer square patch resonator are connected through a first metal through hole and a second metal through hole, and the bottom-layer T-junction microstrip feeder and the lower-layer square patch resonator are connected through a third metal through hole and a fourth metal through hole. The top-layer T-junction microstrip feeder is composed of a first rectangular microstrip line, a second rectangular microstrip line, a third rectangular microstrip line and a fourth rectangular microstrip line, one end of the first rectangular microstrip line is connected to a feeding port, and the other end is vertically connected to the second rectangular microstrip line, the third rectangular microstrip line and the fourth rectangular microstrip line are respectively connected to the two ends of the second rectangular microstrip line, and the third rectangular microstrip line and the fourth rectangular microstrip line are parallel, one end of a first metal through hole is connected to the third rectangular microstrip line, and the other end is connected to the upper-layer square patch resonator, one end of a second metal through hole is connected to the fourth rectangular microstrip line, and the other end is connected to the upper-layer square patch resonator, and the bottom-layer T-junction microstrip feeder is composed of a fifth rectangular microstrip line, a sixth rectangular microstrip line, a seventh rectangular microstrip line and an eighth rectangular microstrip line , one end of the fifth rectangular microstrip line is connected to the feeding port, and the other end is vertically connected to the sixth rectangular microstrip line, the seventh rectangular microstrip line and the eighth rectangular microstrip line are respectively connected to the two ends of the sixth rectangular microstrip line, and the seventh rectangular microstrip line and the eighth rectangular microstrip line are parallel, one end of the third metal through hole is connected to the seventh rectangular microstrip line, and the other end is connected to the lower square patch resonator, one end of the fourth metal through hole is connected to the eighth rectangular microstrip line, and the other end is connected to the lower square patch resonator, the projection of the top T-junction microstrip feeder on the plane where the upper square patch resonator is located and the projection of the bottom T-junction microstrip feeder on the plane where the upper square patch resonator is located are symmetrical about a midline of the upper square patch resonator;

[0005] The projections of the upper square patch resonator and the lower square patch resonator on the plane where the middle metal ground plane is located overlap;

[0006] A first rectangular groove and a second rectangular groove which are symmetrically distributed are etched on the metal grounding plate of the middle layer, so as to couple and transmit the signal of the square patch resonator of the upper layer to the square patch resonator of the lower layer.

[0007] According to some embodiments of the present application, the top-layer T-junction microstrip feed line and the bottom-layer T-junction microstrip feed line are respectively composed of four rectangular microstrip lines, wherein the top-layer T-junction microstrip feed line and the bottom-layer T-junction microstrip feed line are symmetrical about the vertical AA' symmetry axis.

[0008] According to some embodiments of the present application, two symmetrical rectangular grooves are etched on the intermediate metal ground plate to establish coupling between the upper and lower square patch resonators to achieve a second-order filter response, wherein the upper and lower square patch resonators are symmetrical about the AA' and BB' symmetry axes and are located at the same position in the vertical direction.

[0009] According to some embodiments of the present application, the first metal via, the second metal via, the third metal via and the fourth metal via are all metallized vias.

[0010] According to an embodiment of the present application, a common-mode feeding wide-stopband filter based on multilayer LCP technology utilizes a common-mode feeding method and reasonably arranges the positions of metal through holes to avoid exciting high-order modes, thereby realizing a wide-stopband filter.

[0011] Compared with the prior art, the advantages of the present invention are as follows: without introducing any additional perturbation element design, the characteristics of the feeding structure itself and the resonant characteristics of the resonator resonant mode are utilized to suppress the excitation of high-order harmonics and design a patch bandpass filter with high frequency selectivity and wide stopband suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of a common-mode feeding wide-stopband filter based on multi-layer LCP technology according to an embodiment of the present application;

[0014] Figure 2 This is a schematic diagram of the structure dimensions of the top-layer T-junction microstrip feed line of a common-mode feeding wide-stopband filter based on multi-layer LCP technology in an embodiment of the present application;

[0015] Figure 3 A schematic diagram of the structural dimensions of an upper square patch resonator of a common-mode feeding wide-stopband filter based on multi-layer LCP technology according to an embodiment of the present application;

[0016] Figure 4 This is a schematic diagram of the structural dimensions of a middle-layer metal ground plate of a common-mode feeding wide-stopband filter based on multi-layer LCP technology according to an embodiment of the present application;

[0017] Figure 5 This is a schematic diagram of the structural dimensions of a lower square patch resonator of a common-mode feeding wide-stopband filter based on multi-layer LCP technology in an embodiment of the present application;

[0018] Figure 6 This is a schematic diagram of the underlying structure and dimensions of a common-mode feeding wide-stopband filter based on multi-layer LCP technology according to an embodiment of the present application;

[0019] Figure 7 This is a schematic diagram of the circuit structure of a common-mode feeding wide-stopband filter based on multi-layer LCP technology in an embodiment of the present application.

[0020] Reference numerals:

[0021] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Top-layer T-junction microstrip feeder 1, first rectangular microstrip line 101, second rectangular microstrip line 102, third rectangular microstrip line 103, fourth rectangular microstrip line 104, upper-layer square patch resonator 2, middle-layer metal ground plate 3, first rectangular slot 301, second rectangular slot 302, lower-layer square patch resonator 4, bottom-layer T-junction microstrip feeder 5, fifth rectangular microstrip line 501, sixth rectangular microstrip line 502, seventh rectangular microstrip line 503, eighth rectangular microstrip line 504, first metal through hole 601, second metal through hole 602, third metal through hole 603 and fourth metal through hole 604. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0027] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0028] Example 1: Reference below Figure 1 A common-mode feeding wide-stopband filter based on multilayer LCP technology according to an embodiment of the present application is described.

[0029] like Figure 1 As shown, according to an embodiment of the present application, a common-mode feeding wide-stopband filter based on multilayer LCP technology includes a top-layer T-shape 1, an upper-layer square patch resonator 2, a middle-layer metal ground plate 3, a lower-layer square patch resonator 4 and a bottom-layer T-junction microstrip feeder 5 arranged in sequence from top to bottom.

[0030] The top-layer T-junction microstrip feed line 1 and the upper-layer square patch resonator 2 are connected through the first metal through hole 601 and the second metal through hole 602 to transmit the input signal; the bottom-layer T-junction microstrip feed line and the lower-layer square patch resonator are connected through the third metal through hole 603 and the fourth metal through hole 604 to transmit the output signal.

[0031] In some embodiments of the present application, Figure 2 and 3 As shown, the top-layer T-junction microstrip feed line is composed of a first rectangular microstrip line 101, a second rectangular microstrip line 102, a third rectangular microstrip line 103 and a fourth rectangular microstrip line 104; one end of the first metal through hole 601 is connected to the third rectangular microstrip line 103, and the other end is connected to the upper square patch resonator 2; one end of the second metal through hole 602 is connected to the fourth rectangular microstrip line 104, and the other end is connected to the upper square patch resonator 2.

[0032] In some embodiments of the present application, Figure 3 and 5 As shown, since the distance between the upper square patch resonator 2 and the lower square patch resonator 4 is L1 and L2 respectively, TM 20 ,TM 02 ,TM 21 and TM 22 The electric field distribution of the mode is zero, while the TM 01The electric field distribution of the mode is relatively strong, so it is suitable to place the first metal via 601 and the second metal via 602 as input feed lines, thereby realizing TM 20 and TM 02 The suppression of higher-order modes such as MOSFET and MOSFET can meet the requirements of device wide stopband design.

[0033] In some embodiments of the present application, Figure 4 As shown, a first rectangular groove 301 and a second rectangular groove 302 symmetrically distributed are etched on the middle metal ground plane 3 to couple and transmit the signal of the upper square patch resonator 2 to the lower square patch resonator 4.

[0034] In some embodiments of the present application, the relative dielectric constant of the LCP core film and the adhesive film material used is 3.0, and the loss tangent is 0.0021. Figure 2-Figure 6 In some embodiments of the present application, the dimensional parameters are as follows (unit: mm): L = 20.5, L1 = 5.25, L2 = 5.7, l1 = 8.6, l2 = 5, l3 = 2.9, w1 = 0.7, w2 = 1.4, w 50 =1, ls=7.06, ws=0.5, t=10, d=0.6, the corresponding guide wavelength size is 0.6λg×0.66λg, where λg is the length of the waveguide at 4.05 GHz (filter center frequency).

[0035] The central frequency of the common-mode feeding wide-stopband filter based on multilayer LCP technology in the present application is 4.05GHz, the relative bandwidth of the 3dB passband is 12.5%, the simulated return loss in the passband is better than 22dB, and the minimum insertion loss in the passband is better than 1.02dB.

[0036] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A common-mode feeding wide stopband filter based on multilayer LCP technology, characterized in that: The invention comprises a top layer T-junction microstrip feeder, an upper layer square patch resonator, a middle layer metal ground plate, a lower layer square patch resonator and a bottom layer T-junction microstrip feeder which are sequentially arranged from top to bottom, the top layer T-junction microstrip feeder and the upper layer square patch resonator are connected through a first metal through hole and a second metal through hole, and the bottom layer T-junction microstrip feeder and the lower layer square patch resonator are connected through a third metal through hole and a fourth metal through hole; The top-layer T-junction microstrip feeder is composed of a first rectangular microstrip line, a second rectangular microstrip line, a third rectangular microstrip line and a fourth rectangular microstrip line, one end of the first rectangular microstrip line is connected to a feeding port, and the other end is vertically connected to the second rectangular microstrip line, the third rectangular microstrip line and the fourth rectangular microstrip line are respectively connected to the two ends of the second rectangular microstrip line, and the third rectangular microstrip line and the fourth rectangular microstrip line are parallel, one end of a first metal through hole is connected to the third rectangular microstrip line, and the other end is connected to the upper-layer square patch resonator, one end of a second metal through hole is connected to the fourth rectangular microstrip line, and the other end is connected to the upper-layer square patch resonator, and the bottom-layer T-junction microstrip feeder is composed of a fifth rectangular microstrip line, a sixth rectangular microstrip line, a seventh rectangular microstrip line and an eighth rectangular microstrip line , one end of the fifth rectangular microstrip line is connected to the feeding port, and the other end is vertically connected to the sixth rectangular microstrip line, the seventh rectangular microstrip line and the eighth rectangular microstrip line are respectively connected to the two ends of the sixth rectangular microstrip line, and the seventh rectangular microstrip line and the eighth rectangular microstrip line are parallel, one end of the third metal through hole is connected to the seventh rectangular microstrip line, and the other end is connected to the lower square patch resonator, one end of the fourth metal through hole is connected to the eighth rectangular microstrip line, and the other end is connected to the lower square patch resonator, the projection of the top T-junction microstrip feeder on the plane where the upper square patch resonator is located and the projection of the bottom T-junction microstrip feeder on the plane where the upper square patch resonator is located are symmetrical about a midline of the upper square patch resonator; The projections of the upper square patch resonator and the lower square patch resonator on the plane where the middle metal ground plane is located overlap; A first rectangular groove and a second rectangular groove which are symmetrically distributed are etched on the metal grounding plate of the middle layer, so as to couple and transmit the signal of the square patch resonator of the upper layer to the square patch resonator of the lower layer.

2. According to claim 1, a common-mode feeding wide-stopband filter based on multilayer LCP technology is characterized in that: The top-layer T-junction microstrip feed line and the bottom-layer T-junction microstrip feed line are respectively composed of four rectangular microstrip lines.

3. According to claim 1, a common-mode feeding wide-stopband filter based on multilayer LCP technology is characterized in that: Two symmetrical rectangular grooves are etched on the middle metal ground plane.

4. The common-mode feeding wide-stopband filter based on multilayer LCP technology according to claim 1 is characterized in that: The first metal through hole, the second metal through hole, the third metal through hole and the fourth metal through hole are all metallized through holes.

5. The common-mode feeding wide-stopband filter based on multilayer LCP technology according to claim 1, characterized in that: The feeding port is 5.25 mm and 5.7 mm away from two sides of the square patch resonator respectively.

6. The common-mode feeding wide-stopband filter based on multilayer LCP technology according to claim 1, characterized in that: The upper square patch resonator and the lower square patch resonator are both squares with a side length of 20.5 mm.

7. The common-mode feeding wide-stopband filter based on multilayer LCP technology according to claim 3 is characterized in that: The two symmetrical rectangular grooves are both 7.06 mm in diameter, 0.5 mm in width, and have a center spacing of 10 mm.

8. The common-mode feeding wide-stopband filter based on multilayer LCP technology according to claim 4 is characterized in that: The diameters of the four metallized through holes are all 0.6 mm.

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