A Compact Omnidirectional Self-Packaged Patch Antenna With Complementary Split-Ring Resonator Loading for Wireless Endoscope Applications

A patch loaded with a complementary split-ring resonator (CSRR) is fabricated on a flexible substrate and folded in a cylindrical shape, forming a self-packaged folded patch antenna with a quasi-omnidirectional radiation pattern. The space inside the cylindrical cavity is electromagnetically shielded by the ground plane of the patch, and therefore electronic circuits can be accommodated in it with little electromagnetic interference (EMI) from the antenna or other external electronics. The CSRR contributes to size reduction. As a test vehicle, a 2.4-GHz ISM-band folded patch antenna is designed, fabricated, and characterized for a wireless capsule endoscope application, where the implemented antenna has a patch length of 10.5 mm (0.11λ ) and a folded cylinder diameter of 10 mm. A 74% size reduction is achieved after CSRR loading. The antenna located at the outermost surface not only functions as an electromagnetic radiator and an EMI shield, but also serve as a mechanical packaging structure.

[1]  Zhi Ning Chen,et al.  Antennas for Portable Devices , 2007 .

[2]  Jun Shi,et al.  A compact self-packaged patch antenna folded in rectangular waveguide shape , 2011, 2011 IEEE International Symposium on Antennas and Propagation (APSURSI).

[3]  I. Gil,et al.  On the electrical characteristics of complementary metamaterial resonators , 2006, IEEE Microwave and Wireless Components Letters.

[4]  J. Bonache,et al.  Equivalent-circuit models for split-ring resonators and complementary split-ring resonators coupled to planar transmission lines , 2005, IEEE Transactions on Microwave Theory and Techniques.

[5]  Jun Shi,et al.  Compact self-packaged active folded patch antenna with omni-directional radiation pattern , 2011, 2011 IEEE 61st Electronic Components and Technology Conference (ECTC).

[6]  J. Venkataraman,et al.  Size reduction in microstrip antennas using left-handed materials realized by complementary split-ring resonators in ground plane , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[7]  J. J. Ma,et al.  Design the size reduction patch antenna based on complementary split ring resonators , 2010, 2010 International Conference on Microwave and Millimeter Wave Technology.

[8]  Zhi Ning Chen,et al.  Antennas for Portable Devices: Chen/Antennas for Portable Devices , 2007 .

[9]  David R. Smith,et al.  Microwave transmission through a two-dimensional, isotropic, left-handed metamaterial , 2001 .

[10]  J. L. Knighten,et al.  Effects of device variations on the EMI potential of high speed digital integrated circuits , 1997, IEEE 1997, EMC, Austin Style. IEEE 1997 International Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.97CH36113).

[11]  Yong-Kyu Yoon,et al.  Rectangular waveguide shape folded patch antenna , 2010, 2010 IEEE Antennas and Propagation Society International Symposium.

[12]  Yang Hao,et al.  Characterization of microstrip patch antennas on metamaterial substrates loaded with complementary split‐ring resonators , 2008 .

[13]  T. Itoh,et al.  Design and Characterization of Miniaturized Patch Antennas Loaded With Complementary Split-Ring Resonators , 2012, IEEE Transactions on Antennas and Propagation.