Miniaturization microstrip rectangular-ring bandpass filter using high permittivity substrate

Chen

et al. 2007

Section: Introductionmentioning

confidence: 99%

“…One of the most common applications of GPS is the land vehicle navigation [1][2][3]. The positional information obtained from the GPS receiver can be used in a number of applications varying from vehicle tracking to emergency assistance and vehicle safety systems.…”

Section: Introductionmentioning

confidence: 99%

Multilayer cross‐coupled resonator bandpass filters fabricated on low temperature cofired ceramic substrates

Hsieh

Chen

et al. 2007

“…However, further miniaturization becomes more difficult for this filter. Planar filters using high-permittivity ceramics substrates provide good miniaturization ability [7][8][9]. Therefore, much study has been conducted on planer filters and their components.…”

Section: Introductionmentioning

confidence: 99%

“…To improve the therapy accuracy and protect the healthy tissues, it is useful to get the complex permittivity and conductivity of the tissues in order to give precise output power of the radiation therapeutic instrument. From 1984, many scholars have done the work to measure the dielectric constant of the unorganized tissues of both normal and malignant [6,7].…”

Section: Introductionmentioning

confidence: 99%

Compact cross‐coupled hairpin filter design using ceramic substrates

Shen

Lin

2008

Self Cite

tested. The measured and simulated results for the prototype are presented in Figure 2, and satisfactory agreements between them are observed. It has to be mentioned that the antenna structures of ␣ ϭ 90°and 270°cases are symmetrical to x-axis so the right-hand and left-hand CP radiations have the same performances. For brevity, only the results of ␣ ϭ 90°are shown. For the results shown in Figure 2(a), the axial ratio and cross polarization level (XPL) are measured at the broadside direction, and they indicate that the prototype can offer good CP and LP radiations when ␣ ϭ 90°and 0°, respectively. For the case of ␣ ϭ 90°, the 3 dB-axialratio CP operating bandwidth centered at 3310 MHz is about 21%, and the whole CP operating frequencies have the input impedance of less than 10 dB return loss, as shown in Figure 2(b). For the case of ␣ ϭ 0°, the XPL of less than Ϫ20 dB can be found within the 10 dB-return-loss impedance bandwidth which is about 39% and has the same center frequency as the CP operating bandwidth. The CP and LP radiation patterns were also measured at 3300 MHz, and the results are respectively plotted in Figures 3 and 4. Broadside radiation patterns with a front-to-back ratio of more than 12 dB are seen for the two different polarizations. Also, the gain variations against frequency are shown in Figure 5, and the peak gains of the CP and LP radiations are found to be about 10.6 and 10 dBi, respectively.

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“…However, further miniaturization becomes more difficult for this filter. Planar filters using high-permittivity ceramic substrate, such as parallel-coupled filter [2], interdigital filter [3], combline filters [4], and hairpin filter [5][6][7][8][9], provide good miniaturization ability. Generally speaking, a conventional half-wavelength open-line microstrip resonator is too large to be used in modern communication systems such as personal communication systems at 900 and 1800 MHz, and wireless location area networks at 2.4 and 5.3 GHz [2].…”

Section: Introductionmentioning

confidence: 99%

Using high permittivity ceramic substrates to fabricate a miniaturized bandpass filter with capacitive load

Wang

2007

Self Cite