2.4 GHz Double Loop Antenna with Hybrid Branch-Line 90-Degree Coupler for Widespread Wireless Sensor

摘要

One of the main Telecommunication devices is the wireless sensor system, it requires a compact circuit component system of the electromagnetic network circuit, simple configuration, and low-cost matter, notably for the antenna with the high frequency. 2.4 GHz circuit of Double Loop electromagnetic Microstrip with a hybrid branch-line 90-degree coupler. it is the novelette microstrip circuit configuration and shaped with the open frequency, not a complex circuit, and inexpensive matter at the 2.4 GHz for Widespread Wireless or electromagnetic sensor. This network configuration is a prominent section of the package be composed on the Widespread electromagnetic sensor that is of a 2.4 GHz circuit with the Double Loop patch and hybrid branch-line 90-degree coupler to generate phase shifter with the value is 90-degree on the output component with two input. The microstrip antenna has a narrow bandwidth and a single band with the frequency is 2.36 GHz to 2.34 GHz within below -20dB Return loss or S-parameter and the resonance of frequency 2.4 GHz, it’s not necessary to need to use a bandpass filter to optimization electromagnetic circuit, the spread area pattern is a directional wide area and the value of gain is 4.28 dB and the impedance is 50-ohm microstrip line, the coupler has S41 of -3.49dB, S31 of -3.51dB, S21 of 34.25 dB and Sll of -30.S5 dB, that overall specification is a right agreement. On the whole dimension of the implemented electromagnetic circuit configuration is 96 mm times 90mm with Fr4 of dielectric that has 50 ohms of impedance characteristic.