The radar network system requires high-cost frequency, the complex configuration component of the electromagnetic feeding network circuit to make four output antenna with the same power and different phase output specifically for SIL (Self Injection Locked) Radar, and inexpensive material, especially for the electromagnetic component. 2.4 GHz Square Ring Patch with Ring Slot Microstrip Antenna with four output that has the same power using power divider and 90-degree phase different output for SIL Radar. this is the novel shaped microstrip Antenna with the free frequency, more unassuming configuration, and inexpensive material at the 2.4 GHz for SIL Radar. This system is an important part component of SIL Radar that is package consists of a 2.4 GHz Microstrip antenna with the Square Ring Patch with Ring Slot, double power divider which is double input with quad output with the same power and directional coupler 90-degree phase difference with two input and two output. The Antenna has single band and narrow bandwidth with the frequency is 2.38 GHz until 2.43 GHz under -10dB S parameter and frequency resonance 2.4 GHz, the radiation pattern is directional and the gain is 8.37 dBi, The Power divider has S parameter 2 port output of one part under -20dB at 2.4 GHz and isolation above -4dB that is all good agreement. The 90-degree hybrid coupler has S35 of -35.95dB, S46 of 35.09, S53 of -3.47, and S64 of -3.39 that all is qualified good operation. And size all of the indicate antenna systems is 100 mm and 55.7 mm with Phenolic White Paper with a constant dielectric is 4.4 that has 50 ohms.Index Terms-Microstrip antenna,SIL Radar, Square Ring patch.

The microstrip antennas have different dimensions to get the desired performance, especially for microstrip antennas that have complex components and dimensions with the performance: the range of frequency at 2.4 GHz until 3.6 GHz, Maximum Power of Gain value is 5.83 dB and the minimum value is 3 dB and Maximum Directivity Value is 6.22 and the minimum value is 3.32. in consequence, needs to fill the demand for a new and the corresponding design as solvent to adaptive matching as tuner the frequency on antenna design that needs requires a complex mathematical method and simulation. This paper has the novel design to tune the performance of spade card microstrip antenna that can operate on the single, dual or multiband and able to produce circular or linear polarization using Backpropagation Neural Network in order to obtain an optimum design with a backpropagation algorithm as a solution to simplify the design process. As a result, after 20000 epochs the training loss is around 0.044 and the testing loss is around 0.058. The model has a good performance despite only using a few numbers of training data.

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Penelitian ini membahas tentang perancangan dan implementasi antena mikrostrip Compact Double Square Marge untuk aplikasi Long Term Evolution pada frekuensi kerja 2.6 GHz. Antena mikrostrip Double Square Marge patch ini dirancang dengan menambahkan coupler dengan perbedaan fasa 90⁰ pada microstrip feeder pada antena dan menggunakan feed line sebagai metode pencatuannya. Perancangann antena mikrostrip dilakukan secara matematis kemudian dilakukan simulasi dengan menggunakan software desain antenna secara simultan. setelah diperoleh hasil yang optimal kemudian antena di implemenatsikan menggunakan Bahan Epoxy fiberglass -FR 4 dengan konstanta dielektrik (εr)=4,2. Hasil pengujian antena mikrostrip Compact Double Square Marge menunjukkan adanya tinggkat presisi yang baik pada frekuensi kerja yang direncanakan yaitu 2.6 GHz, antena mikrostrip hasil fabrikasi menunjukan kinerja yang maksimal dengan nilai return loss -27.45; nilai gain sebesar 7,84 dBi ; dan memiliki polarisasi ellips. Bentuk pola radiasi antena ini adalah directional. Coupler memiliki nilai return loss di bawah -25 dB dan nilai isolasi di atas -4dB.

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