A study on bandwidth enhancement of 900/1800 dual band LTCC chip antenna by using equivalent circuit analysis

Abstract

In this article, low temperature cofired ceramic (LTCC) technology was used to realize the quarter of wavelength helical antenna instead of the quarter of wavelength monopole for achieving minimization of ceramic chip antenna (13 mm 3 5.25 mm 3 1.2 mm). The equivalent circuit of the helix-monopoles combination of chip antenna has been established successfully. Using circuit simulation on the equivalent circuit model we proposed, two extra parasitic monopole antennas were added into helix antenna to enhance the second mode bandwidth because of the presence of these two close modes. The measured performance of the dual band LTCC chip antenna with helix-three monopoles has been successfully predicted by using circuit simulation instead of EM simulation. The first and the second modes bandwidth of the dual band chip antenna can be achieved to 95 MHz (880-975 MHz) (meeting GSM band) and 300MHz (covering DCS and PCS band), respectively. The measured peak gains of this ceramic chip antenna are approximately 21.8 dB in low band and 0.6 dB in high band based on the 120 3 40 mm 2 ground size.

Compact dual-band chip antenna using LTCC technology for mobile handsets

“…Two radiation paths can be made as a staked meander line structure [2][3], coupled meander line structure [4] or combine meander line with parasitic patches [5][6]. Another way is that dual-frequency structure can be designed by using one solid helix with suitable resonance length or add branches on it [7][8].…”

“…In previous studies, meander type and helix type conductor lines play important roles in small antenna designs. Many different methods have been investigated to achieve dual-band operation [2][3][4][5][6][7][8]. One way is the adoption of two separate radiation paths, and each path has different resonant frequency.…”

A Dual-Band LTCC Antenna with Cross Circuitous Structure

“…Meander lines, spiral lines and multi-space radiation structure can reduce the size of the LTCC antenna and lower resonant frequency effectively [4,5]. To obtain with multi-band, coupled meander line and dual-path structure have been successfully used in LTCC antenna design [6,7].…”