Compact Agile Antenna Concept Utilizing Reconfigurable Front End for Wireless Communications

The conventional full-duplex radio communication systems require that the radio transmitter (Tx) is active at the same time as the radio receiver (Rx). The Tx and the Rx are using separate dedicated frequency bands and the Tx-Rx isolation is ensured by duplex filters. However, increasing number of frequency bands crave for multiband and multimode operation, which either require agile duplexers or a bank of narrow-band filters with a switch. While practical agile duplexers are not available, a bank of narrow-band filters with a switch is bulky and incurs switching loss. This paper proposes an approach that separates the Tx and Rx chain throughout the front end (FE). The complexity of the FE is reduced dramatically by replacing the duplex filters with tunable filters and closely integrating the tunable antennas in the FE, providing filtering which can be used to lower requirements for the tunable filters. For this purpose, very small narrow-band antennas are designed, which can cover 1710-2170 MHz by using tunable capacitors. Simulations and measurements of the antenna concept are carried out in the proposed FE architecture, serving as a proof of concept.

[1]  G. F. Pedersen,et al.  Coupling element antenna with slot tuning for handheld devices at LTE frequencies , 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

[2]  N. Tien.  Tunable RF MEMS elements , 2004, Proceedings. 7th International Conference on Solid-State and Integrated Circuits Technology, 2004..

[3]  Franco De Flaviis,et al.  Tunable antenna systems for wireless transceivers , 2011, 2011 IEEE International Symposium on Antennas and Propagation (APSURSI).

[4]  F. Harackiewicz,et al.  Magnetic tuning of a microstrip patch antenna fabricated on a ferrite film , 1992, IEEE Microwave and Guided Wave Letters.

[5]  G. F. Pedersen,et al.  A novel figure of merit for small multiantenna systems: The duplex isolation , 2012, Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation.

[6]  M. Rais-Zadeh.  Design and fabrication considerations in developing high-Q MEMS capacitors and inductors , 2011, 2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems.

[7]  T. Itoh,et al.  A slot antenna with electronically tunable length , 1991, Antennas and Propagation Society Symposium 1991 Digest.

[8]  J. Andersen,et al.  Decoupling and descattering networks for antennas , 1976 .

[9]  Outi Kivekäs,et al.  Low-loss tuning circuits for frequency-tunable small resonant antennas , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Seokjin Hong,et al.  Design of an Internal Multiresonant Monopole Antenna for GSM900/DCS1800/US-PCS/S-DMB Operation , 2008, IEEE Transactions on Antennas and Propagation.

[11]  C. Volmer,et al.  An Eigen-Analysis of Compact Antenna Arrays and Its Application to Port Decoupling , 2008, IEEE Transactions on Antennas and Propagation.

[12]  Gert Frølund Pedersen,et al.  Future Vogues in Handset Antenna Systems , 2011, 2011 IEEE Vehicular Technology Conference (VTC Fall).

[13]  Y. Rahmat-Samii,et al.  Optimization of PIFA-IFA combination in handset antenna designs , 2005, IEEE Transactions on Antennas and Propagation.

[14]  S. Best,et al.  Impedance, bandwidth, and Q of antennas , 2005 .

[15]  Gert Frølund Pedersen,et al.  On the efficiency of frequency reconfigurable high-Q antennas for 4G standards , 2012 .

[16]  Samantha Caporal Del Barrio,et al.  Challenges for Frequency-Reconfigurable Antennas in Small Terminals , 2012, 2012 IEEE Vehicular Technology Conference (VTC Fall).

[17]  Shyh-Jong Chung,et al.  A Decoupling Technique for Increasing the Port Isolation Between Two Strongly Coupled Antennas , 2008, IEEE Transactions on Antennas and Propagation.

[18]  Risto Valkonen,et al.  Broadband tuning of mobile terminal antennas , 2007 .

[19]  Prakash Bhartia,et al.  Frequency agile microstrip antennas , 1982 .

[20]  Gert F. Pedersen,et al.  On the currents magnitude of a tunable Planar-Inverted-F Antenna for low-band frequencies , 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

[21]  G. F. Pedersen,et al.  A novel paradigm for high isolation in multiple antenna systems with user's influence , 2010, Proceedings of the Fourth European Conference on Antennas and Propagation.

[22]  M. B. Knudsen,et al.  Breaking the Transmitter–Receiver Isolation Barrier in Mobile Handsets With Spatial Duplexing , 2013, IEEE Transactions on Antennas and Propagation.

[23]  Shyam S. Pattnaik,et al.  Tuning of microstrip antenna on ferrite substrate , 1993 .

[24]  Jean-Philippe Michel,et al.  Design of a RF matching network based on a new tunable inductor concept , 2011, Microelectron. J..

[25]  R.J. Langley,et al.  Quad-Band Internal Mobile Phone Antenna , 2007, IEEE Transactions on Antennas and Propagation.

[26]  K. A. Jose,et al.  EXPERIMENTAL INVESTIGATIONS ON ELECTRONICALLY TUNABLE MICROSTRIP ANTENNAS , 1999 .

[27]  H.A. Wheeler,et al.  Fundamental Limitations of Small Antennas , 1947, Proceedings of the IRE.

[28]  Roger F. Harrington,et al.  Effect of antenna size on gain, bandwidth, and efficiency , 1960 .

[29]  F. Ayazi,et al.  MEMS Switched Tunable Inductors , 2008, Journal of Microelectromechanical Systems.

[30]  R. G. Polcawich,et al.  High-Performance Micromachined Inductors Tunable by Lead Zirconate Titanate Actuators , 2012, IEEE Electron Device Letters.

[31]  A. Chebihi,et al.  A new method to increase the port-to-port isolation of a compact two-antenna UMTS system , 2009, 2009 3rd European Conference on Antennas and Propagation.

[32]  K. Sarabandi,et al.  A varactor-tuned dual-band slot antenna , 2006, IEEE Transactions on Antennas and Propagation.

[33]  M. Hasegawa,et al.  Inverted-FL Antenna With Self-Complementary Structure , 2008, IEEE Transactions on Antennas and Propagation.

[34]  K. Sarabandi,et al.  Dual-band reconfigurable antenna with a very wide tunability range , 2006, IEEE Transactions on Antennas and Propagation.

[35]  L. J. Chu.  Physical Limitations of Omni‐Directional Antennas , 1948 .

[36]  RongLin Li,et al.  A Novel Multiband Planar Antenna for GSM/UMTS/LTE/Zigbee/RFID Mobile Devices , 2011, IEEE Transactions on Antennas and Propagation.

[37]  Seong-Ook Park,et al.  A Simple PIFA-Based Tunable Internal Antenna for Personal Communication Handsets , 2008, IEEE Antennas and Wireless Propagation Letters.

[38]  Prakash Bhartia,et al.  A frequency agile microstrip antenna , 1982 .

[39]  J. Anguera,et al.  Multiband Handset Antenna With a Parallel Excitation of PIFA and Slot Radiators , 2010, IEEE Transactions on Antennas and Propagation.

[40]  Seong-Ook Park,et al.  A Compact Tunable Internal Antenna for Personal Communication Handsets , 2008 .

[41]  M. B. Knudsen,et al.  Multiple Antenna Systems With Inherently Decoupled Radiators , 2012, IEEE Transactions on Antennas and Propagation.

[42]  Jonathan Rodriguez,et al.  Reconfigurable antenna design for mobile handsets including harmonic radiation measurements , 2012 .

[43]  C. Di Nallo,et al.  The enhanced bandwidth folded inverted conformal antenna (EB FICA) for mufti-band cellular handsets , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[44]  M. O. Al-Nuaimi,et al.  Tuning techniques for planar inverted-F antenna , 2001 .

[45]  Young Joong Yoon,et al.  Small Antenna With a Coupling Feed and Parasitic Elements for Multiband Mobile Applications , 2011, IEEE Antennas and Wireless Propagation Letters.

[46]  Hua‐Ming Chen,et al.  Miniature Internal Penta-Band Monopole Antenna for Mobile Phones , 2010, IEEE Transactions on Antennas and Propagation.