Research of Multi-band and Low Profile LTCC Antenna for Mobile Handsets
|School||Huazhong University of Science and Technology|
|Course||Microelectronics and Solid State Electronics|
|Keywords||LTCC Antenna Tortuous linear Spiral type Tri-band|
Miniaturization tortuous linear LTCC antenna for multi - band , were designed to have a hole tortuous linear LTCC LTCC antenna tortuous linear and non- vias antenna . Hole tortuous linear LTCC antenna radiating element has two connection interlayer vias (via) . The resonance frequency of the the lower meander line (bottom meander) is designed to be 900 MHz, upper zigzag line the (top menader) resonant frequency is designed to 1800 MHz , by adjusting the distance between the upper and lower layers (i.e. , the height of the through-hole ) , the overlapping area to obtain a first three resonant band - DAB ( digital Audio broadcasting, digital Audio broadcasting) , HFSS software simulation , antenna , omni-directional obvious GSM / DAB / DCS band were 120,180,150 MHz bandwidth . No vias tortuous linear LTCC antenna has a total of two layers of radiation elements , the interlayer does not vias for interconnection , but the direct use of electromagnetic coupling method . The top - level radiation unit (top layer) is designed to be a quarter wavelength resonator and a half wavelength resonator , the work in the GSM and DCS bands , respectively , the radiating element of the lower layer (lower layer) is designed to a quarter wavelength resonator , working in the UMTS band . HFSS simulation , antenna , omni-directional bandwidth of GSM / DCS / UMTS three bands are 40,120,110 MHz; gains respectively of is -0.77,1.45,1.14 dB . Designed for broadband LTCC antenna the DCS band spiral LTCC antenna , simulation results show 10 dB return loss bandwidth of 240 MHz broadband antenna structure of the spiral and rectangular ring integrated into the design , simulation results show that the antenna 10 dB back wave loss bandwidth of 610 MHz (1.73 ~ 2.34 GHz), and a sufficiently wide bandwidth can covering DCS / PCS / UMTS / WiBro band proved spiral and rectangular ring combination can effectively enhance the LTCC antenna bandwidth . In order to verify that no hole tortuous linear the LTCC antenna design reasonable , article ε_r = 7.8 ± 0.2 relative permittivity , dielectric loss tanδ = 0.014 (Dupont 951C2) Health tiles , laminated laminated 21 which 9th layer on the silver electrode is operating in the UMTS band , the layer 21 is a silver electrode of the work in the GSM and DCS bands , in the the 850 ℃ cofired produce LTCC antenna . Using a relative permittivity of ε_r = 4.4, dielectric loss tanδ = 0.02 (FR4) of the test plate after network analyzer test results as follows: three resonator band center resonant frequency is 840 MHz , 1.49 GHz , 2.23 GHz , The reflection coefficient ( dB ( S11 )) were -11.5, -16.9, -10.6 dB.