Basic Procedure to Find the Required Dimensions for an Dual Substrate Antenna
时间：04-06
整理：3721RD
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This is the microstrip antenna that I am supposed to implement for my project.
Now I dont know where or how to start with this. If someone can give me a brief overview regarding the steps to design it will be really helpful.
What I am looking for is equations which give me the above dimensions an the basic design procedure.
Details regarding the above antenna:
frequency of operation 2GHZ
The novel antenna consists of two layers: the radiating part and the network part. The upper layer consists four rectangular radiating patches with a length of Lp and width of Wp printed on a square substrate with a dielectric constant of er2, tandel2= 0.0018 height of h2, and length of Ls. The four patches are arranged in a square ring structure with the center of the substrate as the coordinate center, and the gap of each adjacent one is . The down layer is a feed network made by three Wilkinson power dividers, of which the feed lines are printed on a square substrate with a dielectric constant of , , height of , and length of . The four outputs of the feed network are symmetrically connected to the patch by four pins. The square ground plane with size of is printed in between the two substrates. Four copper holes of size larger than the pin radius are etched on the ground plane to isolate the four pins. Twelve switches divided into two types (white and green for clarity in Fig. 1) are interconnected in the feed line to control the phase of the four output sources of the feed network. Location of the pins with a distance away from the edge of the radiating patch is optimized to obtain good impedance match. The sizes of the two substrates and patch are calculated to obtain the center operating frequency 2 GHz.
The operation of the antenna is as follows. When gaps A are closed and gaps B are open, the antenna works in conical mode (radiates with conical radiation patterns). Four outputs of the feed network are of equal magnitude and phase, thus the currents in each of the radiating patches are equal in magnitude and phase, which is shown in Fig. 2(a). In this occasion, the antenna is similar to a short monopole antenna, so a conical pattern with a vertical field polarization can be obtained.
When gaps A are open and gaps B are closed, the antenna works in broadside mode (radiates with broadside radiation patterns). On this occasion, four outputs of the feed network are of equal magnitude but 90 phase difference for each adjacent output, and the antenna works like an antenna array feeding with sequential rotation technique, which can improve the bandwidth,
polarization purity, and the radiation pattern symmetry of antenna [17]. Sequential rotation technique is a method that generates circularly polarized radiation from an array composed
of linearly polarized elements having unique angular and phase arrangements. The element angular orientation and feed phase of the proposed 2 2 subarray are arranged in the 0 , 90 ,
180 , 270 fashion.
For more details refer to the PDF file attached below
This is the microstrip antenna that I am supposed to implement for my project.
Now I dont know where or how to start with this. If someone can give me a brief overview regarding the steps to design it will be really helpful.
What I am looking for is equations which give me the above dimensions an the basic design procedure.
Details regarding the above antenna:
frequency of operation 2GHZ
The novel antenna consists of two layers: the radiating part and the network part. The upper layer consists four rectangular radiating patches with a length of Lp and width of Wp printed on a square substrate with a dielectric constant of er2, tandel2= 0.0018 height of h2, and length of Ls. The four patches are arranged in a square ring structure with the center of the substrate as the coordinate center, and the gap of each adjacent one is . The down layer is a feed network made by three Wilkinson power dividers, of which the feed lines are printed on a square substrate with a dielectric constant of , , height of , and length of . The four outputs of the feed network are symmetrically connected to the patch by four pins. The square ground plane with size of is printed in between the two substrates. Four copper holes of size larger than the pin radius are etched on the ground plane to isolate the four pins. Twelve switches divided into two types (white and green for clarity in Fig. 1) are interconnected in the feed line to control the phase of the four output sources of the feed network. Location of the pins with a distance away from the edge of the radiating patch is optimized to obtain good impedance match. The sizes of the two substrates and patch are calculated to obtain the center operating frequency 2 GHz.
The operation of the antenna is as follows. When gaps A are closed and gaps B are open, the antenna works in conical mode (radiates with conical radiation patterns). Four outputs of the feed network are of equal magnitude and phase, thus the currents in each of the radiating patches are equal in magnitude and phase, which is shown in Fig. 2(a). In this occasion, the antenna is similar to a short monopole antenna, so a conical pattern with a vertical field polarization can be obtained.
When gaps A are open and gaps B are closed, the antenna works in broadside mode (radiates with broadside radiation patterns). On this occasion, four outputs of the feed network are of equal magnitude but 90 phase difference for each adjacent output, and the antenna works like an antenna array feeding with sequential rotation technique, which can improve the bandwidth,
polarization purity, and the radiation pattern symmetry of antenna [17]. Sequential rotation technique is a method that generates circularly polarized radiation from an array composed
of linearly polarized elements having unique angular and phase arrangements. The element angular orientation and feed phase of the proposed 2 2 subarray are arranged in the 0 , 90 ,
180 , 270 fashion.
For more details refer to the PDF file attached below
From all the references and googling of data what I have realised is that this design is mostly related to simulations not many equations are involved.
There arent any equations available for direct design of 2x2 array. What I will have to do is design a simple patch for 2ghz operating frequency. Then using simulations I will have to adjust the locations of four such patterns along with the lower feeding patch network.
But all this is taking a lot of time plus designing with two substrates is a big problem. If there is any other alternative it will be a big time saver.
I have already started the simulations on GENESYS but since I am new to this software the progress is very slow.