STUDIES ON MICROWAVE ANTENNAS: PASSIVE INTERMODULATION DISTORTION IN ANTENNA STRUCTURES AND DESIGN OF MICROSTRIP ANTENNA ELEMENTS

Passive intermodulation (PIM) measurements of antennas and the design of dual-polarised microstrip antenna elements are investigated in this thesis. The emphasis is on the development of a passive intermodulation source localisation method and on the studies of the PIM source behaviour under various impedance loading conditions. Passive intermodulation distortion can be harmful in wireless communication systems where the difference between the transmitted and the received power is large such as in GSM base stations. One of the most critical components is the antenna. As the antennas become more complex, the risk of getting excessive PIM distortion increases. Therefore, the antenna designer needs to have knowledge about the PIM phenomenon and proper tools to investigate various antenna structure configurations. The concept of PIM near-field measurement is introduced and the implementation of the equipment for the GSM 900 frequency band is presented. The performance of the scanner is analysed and demonstrated with measurements. The scanner is capable of locating PIM sources in antennas and other open structures down to −110 dBm when the transmitted power is 43 dBm. The limiting factors of the scanner sensitivity are considered and several sensitivity measurements are performed. An analysis of the impedance loading effects on PIM measurements is carried out. The conducted measurements support the theory that the loading impedance effects can be several decibels, when the source or load return loss is less than 20 dB, which is the case with many filters and antennas used in base stations. Dual-polarised antenna elements are needed in various array antenna applications. Two compact antenna element designs with moderate bandwidth and dual polarisation are introduced in the 12 GHz frequency band. The elements use a dual-resonant structure in order to achieve an impedance bandwidth of 16 % (L retn > 10 dB). The arrangement of the antenna feeds results in an isolation of 35 dB between the ports.

[1]  C. Kittel.  Introduction to solid state physics , 1954 .

[2]  J. A. Betts,et al.  Intermodulation interference in mobile multiple-transmission communication systems operating at high frequencies (3-30 MHz) , 1973 .

[3]  G. Heiter.  Characterization of Nonlinearities in Microwave Devices and Systems , 1973 .

[4]  J. J. Bussgang,et al.  Analysis of nonlinear systems with multiple inputs , 1974 .

[5]  G. T. Hurst.  Spurious Signals Generated by Electron Tunneling on Large Reflector Antennas , 1975 .

[6]  John Rockway,et al.  A Method of Detecting Significant Sources of Intermodulation Interference , 1975, IEEE Transactions on Electromagnetic Compatibility.

[7]  W. H. Ku,et al.  A Study of Nonlinearities and Intermodulation Characteristics of 3-Port Distributed Circulators , 1976 .

[8]  C. S. Guenzer.  Comments on "Spurious signals generated by electron tunneling on large reflector antennas" , 1976 .

[9]  J. Wilcox,et al.  Thermal Heating Contribution to Intermodulation Fields in Coaxial Waveguides , 1976, IEEE Trans. Commun..

[10]  J. C. Bennett,et al.  Microwave holographic metrology of large reflector antennas , 1976 .

[11]  Frank Benson,et al.  Coaxial Cables as Sources of Intermodulation Interference at Microwave Frequencies , 1978, IEEE Transactions on Electromagnetic Compatibility.

[12]  C. D. Bond,et al.  Intermodulation generation by electron tunneling through aluminum-oxide films , 1979, Proceedings of the IEEE.

[13]  A. Ehrlich,et al.  A study of rf nonlinearities in nickel , 1979 .

[14]  Farrokh Arazm,et al.  Nonlinearities in Metal Contacts at Microwave Frequencies , 1980, IEEE Transactions on Electromagnetic Compatibility.

[15]  T. Stern,et al.  The Order-and-Type Prediction Problem Arising from Passive Intermodulation Interference in Communications Satellites , 1981, IEEE Trans. Commun..

[16]  M. Steer,et al.  Relationship between Volterra series and generalized power series , 1983, Proceedings of the IEEE.

[17]  M.B. Steer,et al.  An algebraic formula for the output of a system with large-signal multifrequency excitation , 1983, Proceedings of the IEEE.

[18]  G. Ghione,et al.  Inter-modulation products generation from carbon fibre reflector antennas , 1985, 1985 Antennas and Propagation Society International Symposium.

[19]  D. Pozar.  MICROSTRIP ANTENNA COUPLED TO A MICROSTRIP-LINE , 1985 .

[20]  M. Antler,et al.  Survey of Contact Fretting in Electrical Connectors , 1985 .

[21]  D. Pozar.  Finite phased arrays of rectangular microstrip patches , 1986 .

[22]  M. Runde,et al.  Detection of a-Spots in Aluminum Contacts , 1986 .

[23]  Ashok Kumar.  Passive IM products threaten high-power satcom systems , 1987 .

[24]  M. Runde.  Mass Transport in Stationary Contact Points , 1987 .

[25]  F. Kilburg,et al.  Aperture-coupled patch antennas with wide-bandwidth and dual-polarization capabilities , 1988, 1988 IEEE AP-S. International Symposium, Antennas and Propagation.

[26]  Stephen A. Maas,et al.  Nonlinear microwave circuits , 1988 .

[27]  P. L. Lui,et al.  Measurement of intermodulation products generated by structural components , 1988 .

[28]  G. P. Rodrigue.  A generation of microwave ferrite devices , 1988, Proc. IEEE.

[29]  P. L. Lui,et al.  Passive non-linearities in antenna systems , 1989 .

[30]  P. O. Ho,et al.  The suppression of intermodulation product generation in materials and structures used in radio communications , 1989 .

[31]  P. L. Lui,et al.  The field measurement of passive intermodulation products , 1989 .

[32]  H. Tamura,et al.  Third Harmonic Distortion of Dielectric Resonator Materials , 1989 .

[33]  M. Runde,et al.  Experimental study of the conducting spots in aluminium contact interfaces , 1989, Proceedings of the Thirty Fifth Meeting of the IEEE Holm Conference on Electrical Contacts.

[34]  J. C. Bennett,et al.  Microwave holographic imaging of intermodulation product sources applied to reflector antennas , 1989 .

[35]  F. E. Gardiol,et al.  The SSFIP: a global concept for high performance broadband planar antennas , 1989 .

[36]  A. V. D. Capelle,et al.  An impedance-matching technique for increasing the bandwidth of microstrip antennas , 1989 .

[37]  Wai-Cheung Tang,et al.  MICROWAVE EQUIPMENT FOR SATELLITE APPLICATIONS , 1990 .

[38]  P. L. Lui,et al.  Passive intermodulation interference in communication systems , 1990 .

[39]  David M. Pozar,et al.  Design considerations for low sidelobe microstrip arrays , 1990 .

[40]  W. Bolton.  Electrical and magnetic properties of materials , 1992 .

[41]  F. S. Sandroff,et al.  Reliability qualification test for circuit boards exposed to airborne hygroscopic dust , 1992, 1992 Proceedings 42nd Electronic Components & Technology Conference.

[42]  Robert J. Mailloux,et al.  Phased Array Antenna Handbook , 1993 .

[43]  J. Sanford.  Passive intermodulation considerations in antenna design , 1993, Proceedings of IEEE Antennas and Propagation Society International Symposium.

[44]  N. Rozario,et al.  Investigation of Telstar 4 spacecraft Ku-band and C-band antenna components for multipactor breakdown , 1994 .

[45]  Guy A. E. Vandenbosch,et al.  Study of the capacitively fed microstrip antenna element , 1994 .

[46]  L. Boyer,et al.  Experimental and theoretical study of creep effects in electrical contacts , 1995, Electrical Contacts - 1995. Proceedings of the Forty-First IEEE Holm Conference on Electrical Contacts.

[47]  P. Brachat,et al.  Printed radiating element with two highly decoupled input ports , 1995 .

[48]  Von Hippel,et al.  Dielectric and waves , 1995 .

[49]  J.W. Boyhan,et al.  Satellite passive intermodulation: systems considerations , 1996, IEEE Transactions on Aerospace and Electronic Systems.

[50]  A. D. Rawlins,et al.  Principles of low PIM hardware design , 1996, Thirteenth National Radio Science Conference. NRSC '96.

[51]  D. J. Lynch,et al.  Third order intermodulation performance of above resonance circulators , 1997 .

[52]  Nicholas Fourikis,et al.  Phased array-based systems and applications , 1997 .

[53]  A. D. Rawlins,et al.  The impact of passive intermodulation on specifying and characterising components , 1997 .

[54]  C. Vittoria,et al.  Nonlinear intermodulation coupling in ferrite circulator junctions , 1997 .

[55]  J.-G. Dumoulin,et al.  Passive intermodulation and its effect on space programs , 1998 .

[56]  C. Beckman.  Dual polarized aperture coupled patch multibeam antenna , 1998, IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36.

[57]  E. Weibel,et al.  Tests evaluate the influence of junctions on PIM , 1998 .

[58]  F. Rostan,et al.  Aperture-Coupled Microstrip Patch Phased Arrays in C- and X-Band: A Contribution to Future Multi-Polarization Multi- Frequency SAR Systems , 1998 .

[59]  Lay Kee Ang,et al.  Multipactor discharge on metals and dielectrics: Historical review and recent theories , 1998 .

[60]  A.D. Rawlins,et al.  PIM Characterisation of the ESTEC Compact Test Range , 1998, 1998 28th European Microwave Conference.

[61]  P. Vainikainen,et al.  Near-Field Amplitude Measurement of Passive Intermodulation in Antennas , 2001, 2001 31st European Microwave Conference.

[62]  Pertti Vainikainen,et al.  Passive intermodulation distortion measurements in mobile communication antennas , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[63]  R. D. Malucci.  High frequency considerations for multi-point contact interfaces , 2001, Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192).

[64]  R. Timsit,et al.  Constriction resistance at high signal frequencies , 2001, Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192).

[65]  Stefano Selleri,et al.  A time-domain physical optics heuristic approach to passive intermodulation scattering , 2001 .

[66]  J. Dallaire,et al.  Antenna PIM measurements and associated test facilities , 2001, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229).

[67]  Kin‐Lu Wong.  Compact and Broadband Microstrip Antennas , 2002 .

[68]  Jose C. Pedro,et al.  A comprehensive explanation of distortion sideband asymmetries , 2002 .

[69]  Tatsuo Itoh,et al.  Dielectric materials, devices, and circuits , 2002 .

[70]  K. Kataoka,et al.  Characterization of fritting phenomena on Al electrode for low contact force probe card , 2003 .

[71]  Juan de Lara,et al.  AO-4025 ITT ESA - Surface treatments and coatings for reduction of multipactor and Passive InterModulation (PIM) effect in RF components , 2003 .

[72]  Muhammad Taher Abuelma'atti.  Prediction of passive intermodulation arising from corrosion , 2003 .

[73]  P. Vainikainen,et al.  Sensitivity measurements of a passive intermodulation near-field scanner , 2003, IEEE Antennas and Propagation Magazine.

[74]  S. Gao,et al.  Dual-polarized slot-coupled planar antenna with wide bandwidth , 2003 .

[75]  Anthony E. Parker,et al.  Effect of baseband impedance on FET intermodulation , 2003 .

[76]  J.L. Volakis,et al.  Fully integrated electrothermal multidomain modeling of RF MEMS switches , 2003, IEEE Microwave and Wireless Components Letters.

[77]  J. S. Kenney,et al.  A reduced intermodulation distortion tunable ferroelectric capacitor: architecture and demonstration , 2003, IMS 2003.

[78]  P. Vainikainen,et al.  Effect of impedance loading at higher harmonics on passive intermodulation in antennas , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[79]  G. Macchiarella,et al.  Experimental study of passive intermodulation in coaxial cavities for cellular base stations duplexers , 2004, 34th European Microwave Conference, 2004..

[80]  A.V. Raisanen,et al.  Passive intermodulation near-field measurements on microstrip lines , 2004, 34th European Microwave Conference, 2004..

[81]  R. Kwiatkowski,et al.  Modeling microwave contact discontinuities , 2004, 34th European Microwave Conference, 2004..

[82]  Antti V. Räisänen,et al.  Effect of load impedance on passive intermodulation measurements , 2004 .

[83]  P. Vainikainen,et al.  Near-field scanner for the detection of passive intermodulation sources in base station antennas , 2004, IEEE Transactions on Electromagnetic Compatibility.