閔考斯基碎型貼片帶通濾波器之微型化與多頻帶設計

Minkowski-island-based Fractal Patch Band Bass Filter for Miniaturization and Multi-band Design

劉信祥(Hsin-Hsiang Liu)

指導教授 ： 劉智群

健行科技大學/電資學院/電機工程所/碩士(2012年)

摘要

本論文提出三種碎型貼片結構，採閔考斯基碎型，設計帶通濾波器，以達微型化。其中，設計一主要是用閔考斯基二次遞迴、微擾源結構與T型饋入，產生雙模特性與寬頻效果。其次，設計二是以閔考斯基二次遞迴、微擾源結構與指插饋入，激發出雙頻響應特性。最後，設計三是利用閔考斯基碎型比例的改變、微擾源結構與指插饋入，造成出寬頻響應效果。同時，提出寬頻等效電路以頻率響應分析設計三之特性。在應用上，設計一應用於WLAN IEEE802.11b/g systems，設計二則是應用於WLAN IEEE802.11a/b/g systems，設計三應用於UWB systems。
在實例上，設計一的單頻濾波器，中心頻率為2.44 GHz，最小介入損耗為 - 0.73dB，比例頻寬為11.47%，較深的零點衰減量為 -48.7 dB / -41.5 dB，尺寸縮小為60.6%。設計二的雙頻濾波器I，中心頻率為2.55/ 5.35 GHz，最小介入損耗為 -0.39 / -0.36 dB，比例頻寬為30.9/ 21.5 %；雙頻濾波器II，中心頻率為2.56/ 5.33 GHz，最小介入損耗為 - 0.46/-0.42 dB，比例頻寬為31.2/ 20.3%。設計三的寬頻濾波器，中心頻率為4.68 GHz，最小介入損耗為 -0.27 dB，比例頻寬為78.4%，較深的零點衰減量為–39.8 dB /–29.7 dB。

關鍵字

閔考斯基 ； 貼片型諧振器 ； 雙模 ； 微型化

並列摘要

Three fractal patch, using Minkowski-island-based (MIB) fractal, are proposed to design band-pass filter for miniaturization in this thesis. The design I is mainly used MIB fractal configuration with 2nd order iteration, perturbation and T coupling for dual-mode and wide-band. In the design II, it uses MIB 2nd order iteration, perturbation and interdigital coupling for dual-band. In the design III, by the change of the fractal proportion and interdigital coupling is used for obtaining multi-band. Mean time, the wide-band equivalent circuit model is proposed for analyzing the frequency response of design III. For application, design I can be applied to the WLAN 802.11b/g systems, design II can be applied to the WLAN 802.11a/b/g systems, design III can be applied to the UWB systems.
In practice, design I presents the center frequency of 2.44 GHz, low insertion loss of -0.73 dB, fractional bandwidth(FBW) with 11.47%, high rejection level of –487.5 dB /–41.5 dB, and the size reduction with 60.6%. Design II expresses the two band of 2.55 GHz /5.35 GHz, low insertion loss of -0.39dB /-0.36 dB, FBW with 30.9% /21.5%. The additional design II has the two band of 2.56 GHz /5.33 GHz, low insertion loss of - 0.46dB /-0.42 dB FBW of 31.2% / 20.3%. Design III obtains the center frequency of 4.68 GHz, low insertion loss of -0.27 dB, FBW with 78.4%, and the high rejection level with –39.8 dB /–29.7 dB.
Key words: Minkowski-island-based, patch resonators, dual-mode, Miniaturization

並列關鍵字

Minkowski-island-based ； patch resonators ； dual-mode ； Miniaturization

參考文獻

[1] I. Wolff, “Microstrip Bandpass Filter Using Degenerate Modes of A Microstrip Ring Resonator,” Electronics Letters, Volume 8, Issue 12, pp. 302-303, Jun. 1972.

[2] N. Cohen, “Fractal element antennas,” J Electron Defense, pp. 48–49, 1997.

[3] L. Zhu, P. M. Wecowski and K. Wu, “New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction,” IEEE Transactions on Microwave Theory and Techniques, Volume 47, Issue 5, pp. 650–654, May. 1999.

[4] L. Zhu, B. C. Tan and S. J. Quek, “Miniaturized dual-mode bandpass filter using inductively loaded cross-slotted patch resonator,” IEEE Microwave and Wireless Components Letters, Volume 15, Issue 1, pp. 22–24, Jan. 2005.

[5] W. H. Tu and K. Chang, “Miniaturized dual-mode bandpass filter with harmonic control,” IEEE Microwave and Wireless Components Letters, Volume 15, Issue 12, pp. 838–840, Dec. 2005.