Radio-frequency apparatus with multi-band balun and associated methods
An apparatus includes a radio-frequency (RF) apparatus, and a multi-band matching balun coupled to the RF apparatus. The multi-band matching balun including a plurality of capacitors and a plurality of inductors. None of the plurality of capacitors and none of the plurality of inductors is variable or tunable.
1. An apparatus, comprising:
a radio-frequency (RF) apparatus; and
a multi-band matching balun coupled to the RF apparatus, the multi-band matching balun including a plurality of capacitors and a plurality of inductors used to realize either an inductor having a frequency-dependent inductance or a capacitor having a frequency-dependent capacitance,
wherein none of the plurality of capacitors and none of the plurality of inductors is variable or tunable.
2. The apparatus according to claim 1 , wherein the RF apparatus comprises receive circuitry.
3. The apparatus according to claim 1 , wherein the RF apparatus comprises transmit circuitry.
4. The apparatus according to claim 1 , wherein the RF apparatus comprises both receive circuitry and transmit circuitry.
5. The apparatus according to claim 1 , wherein the multi-band matching balun comprises a three-element frequency-dependent resonator.
6. The apparatus according to claim 5 , wherein the three-element frequency-dependent resonator realizes an inductor having an inductance that varies as a function of frequency.
7. The apparatus according to claim 5 , wherein the three-element frequency-dependent resonator realizes a capacitor having a capacitance that varies as a function of frequency.
8. The apparatus according to claim 7 , wherein the three-element frequency-dependent resonator provides impedance matching between the RF apparatus and either a filter or an antenna.
9. The apparatus according to claim 7 , wherein the three-element frequency-dependent resonator provides balun functionality between the RF apparatus and either a filter or an antenna.
10. An apparatus, comprising:
a radio-frequency (RF) apparatus; and
a multi-band matching balun coupled to the RF apparatus, the multi-band matching balun comprising a three-element frequency-dependent resonator, wherein the three-element frequency-dependent resonator realizes either an inductor having a frequency-dependent inductance or a capacitor having a frequency-dependent capacitance.
11. The apparatus according to claim 10 , wherein the three-element frequency-dependent resonator realizes an inductor having an inductance that varies as a function of frequency.
12. The apparatus according to claim 10 , wherein the three-element frequency-dependent resonator realizes a capacitor having a capacitance that varies as a function of frequency.
13. The apparatus according to claim 10 , wherein the three-element frequency-dependent resonator comprises either (a) two capacitor and an inductor, or (b) two inductors and a capacitor.
14. The apparatus according to claim 10 , wherein the three-element frequency-dependent resonator provides impedance matching functionality and balun functionality in a first band of frequencies from about 310 MHz to about 434 MHz and in a second band of frequencies from about 868 MHz to about 928 MHz.
15. A method of operating an apparatus that includes a radio-frequency (RF) apparatus, the method comprising using a multi-band matching balun coupled to the RF apparatus to provide impedance matching and balun functionality, wherein the multi-band matching balun includes a plurality of capacitors and a plurality of inductors used to realize either an inductor having a frequency-dependent inductance or a capacitor having a frequency-dependent capacitance, and none of the plurality of capacitors and none of the plurality of inductors is variable or tunable.
16. The method according to claim 15 , wherein the multi-band matching balun comprises a three-element frequency-dependent resonator.
17. The method according to claim 16 , wherein the three-element frequency-dependent resonator realizes an inductor having an inductance that varies as a function of frequency.
18. The method according to claim 16 , wherein the three-element frequency-dependent resonator realizes a capacitor having a capacitance that varies as a function of frequency.
19. The method according to claim 15 , wherein the three-element frequency-dependent resonator provides impedance matching between the RF apparatus and either a filter or an antenna.
20. The method according to claim 15 , wherein the three-element frequency-dependent resonator provides balun functionality between the RF apparatus and either a filter or an antenna.